Carbon monoxide poisoning
|Carbon monoxide poisoning|
|Classification and external resources|
|Patient UK||Carbon monoxide poisoning|
Carbon monoxide poisoning occurs after enough inhalation of carbon monoxide (CO). Carbon monoxide is a toxic gas, but, being colorless, odorless, tasteless, and initially non-irritating, it is very difficult for people to detect. Carbon monoxide is a product of incomplete combustion of organic matter due to insufficient oxygen supply to enable complete oxidation to carbon dioxide (CO2). It is often produced in domestic or industrial settings by motor vehicles that run on gasoline, diesel, propane, methane, or other carbon-based fuels and tools, heaters, and cooking equipment that are powered by carbon-based fuels. Exposures at 100 ppm or greater can be dangerous to human health.
Symptoms of mild acute poisoning will include light-headedness, confusion, headaches, vertigo, and flu-like effects; larger exposures can lead to significant toxicity of the central nervous system and heart, and even death. Following acute poisoning, long-term sequelae often occur. Carbon monoxide can also have severe effects on the fetus of a pregnant woman. Chronic exposure to low levels of carbon monoxide can lead to depression, confusion, and memory loss. Carbon monoxide mainly causes adverse effects in humans by combining with hemoglobin to form carboxyhemoglobin (HbCO) in the blood. This prevents hemoglobin from releasing oxygen in tissues, effectively reducing the oxygen-carrying capacity of the blood, leading to hypoxia. Additionally, myoglobin and mitochondrial cytochrome oxidase are thought to be adversely affected. Carboxyhemoglobin can revert to hemoglobin, but the recovery takes time because the HbCO complex is fairly stable.
Treatment of poisoning largely consists of administering 100% oxygen or providing hyperbaric oxygen therapy, although the optimum treatment remains controversial. Oxygen works as an antidote as it increases the removal of carbon monoxide from hemoglobin, in turn providing the body with normal levels of oxygen. The prevention of poisoning is a significant public health issue. Domestic carbon monoxide poisoning can be prevented by early detection with the use of household carbon monoxide detectors. Carbon monoxide poisoning is the most common type of fatal poisoning in many countries. Historically, it was also commonly used as a method to commit suicide, usually by deliberately inhaling the exhaust fumes of a running car engine. Modern automobiles, even with electronically-controlled combustion and catalytic converters, can still produce levels of carbon monoxide which will kill if enclosed within a garage or if the tailpipe is obstructed (for example, by snow) and exhaust gas cannot escape normally. Carbon monoxide poisoning has also been implicated as the cause of apparent haunted houses; symptoms such as delirium and hallucinations have led people suffering poisoning to think they have seen ghosts or to believe their house is haunted.
- 1 Signs and symptoms
- 2 Causes
- 3 Pathophysiology
- 4 Diagnosis
- 5 Naturally-occurring and beneficial effects of CO
- 6 Prevention
- 7 Treatment
- 8 Epidemiology
- 9 See also
- 10 References
- 11 External links
Signs and symptoms
Carbon monoxide is not toxic to all forms of life. Its harmful effects are due to binding with haemoglobin so its danger to organisms that do not use this compound is doubtful. It thus has no effect on photosynthesising plants. It is easily absorbed through the lungs. Inhaling the gas can lead to hypoxic injury, neurological damage, and even death. Different people and populations may have different carbon monoxide tolerance levels. On average, exposures at 100 ppm or greater is dangerous to human health. In the United States, the OSHA limits long-term workplace exposure levels to less than 50 ppm averaged over an 8-hour period; in addition, employees are to be removed from any confined space if an upper limit ("ceiling") of 100 ppm is reached. Carbon monoxide exposure may lead to a significantly shorter life span due to heart damage. The carbon monoxide tolerance level for any person is altered by several factors, including activity level, rate of ventilation, a pre-existing cerebral or cardiovascular disease, cardiac output, anemia, sickle cell disease and other hematological disorders, barometric pressure, and metabolic rate.
|35 ppm (0.0035%)||Headache and dizziness within six to eight hours of constant exposure|
|100 ppm (0.01%)||Slight headache in two to three hours|
|200 ppm (0.02%)||Slight headache within two to three hours; loss of judgment|
|400 ppm (0.04%)||Frontal headache within one to two hours|
|800 ppm (0.08%)||Dizziness, nausea, and convulsions within 45 min; insensible within 2 hours|
|1,600 ppm (0.16%)||Headache, tachycardia, dizziness, and nausea within 20 min; death in less than 2 hours|
|3,200 ppm (0.32%)||Headache, dizziness and nausea in five to ten minutes. Death within 30 minutes.|
|6,400 ppm (0.64%)||Headache and dizziness in one to two minutes. Convulsions, respiratory arrest, and death in less than 20 minutes.|
|12,800 ppm (1.28%)||Unconsciousness after 2–3 breaths. Death in less than three minutes.|
The main manifestations of carbon monoxide poisoning develop in the organ systems most dependent on oxygen use, the central nervous system and the heart. The initial symptoms of acute carbon monoxide poisoning include headache, nausea, malaise, and fatigue. These symptoms are often mistaken for a virus such as influenza or other illnesses such as food poisoning or gastroenteritis. Headache is the most common symptom of acute carbon monoxide poisoning; it is often described as dull, frontal, and continuous. Increasing exposure produces cardiac abnormalities including fast heart rate, low blood pressure, and cardiac arrhythmia; central nervous system symptoms include delirium, hallucinations, dizziness, unsteady gait, confusion, seizures, central nervous system depression, unconsciousness, respiratory arrest, and death. Less common symptoms of acute carbon monoxide poisoning include myocardial ischemia, atrial fibrillation, pneumonia, pulmonary edema, high blood sugar, lactic acidosis, muscle necrosis, acute kidney failure, skin lesions, and visual and auditory problems.
One of the major concerns following acute carbon monoxide poisoning is the severe delayed neurological manifestations that may occur. Problems may include difficulty with higher intellectual functions, short-term memory loss, dementia, amnesia, psychosis, irritability, a strange gait, speech disturbances, Parkinson's disease-like syndromes, cortical blindness, and a depressed mood. Depression may even occur in those who did not have pre-existing depression. These delayed neurological sequelae may occur in up to 50% of poisoned people after 2 to 40 days. It is difficult to predict who will develop delayed sequelae; however, advanced age, loss of consciousness while poisoned, and initial neurological abnormalities may increase the chance of developing delayed symptoms.
One classic sign of carbon monoxide poisoning is more often seen in the dead rather than the living – people have been described as looking red-cheeked and healthy (see below). However, since this "cherry-red" appearance is common only in the deceased, and is unusual in living people, it is not considered a useful diagnostic sign in clinical medicine. In pathological (autopsy) examination the ruddy appearance of carbon monoxide poisoning is notable because unembalmed dead persons are normally bluish and pale, whereas dead carbon-monoxide poisoned persons may simply appear unusually lifelike in coloration. The colorant effect of carbon monoxide in such postmortem circumstances is thus analogous to its use as a red colorant in the commercial meat-packing industry.
Chronic exposure to relatively low levels of carbon monoxide may cause persistent headaches, lightheadedness, depression, confusion, memory loss, nausea and vomiting. It is unknown whether low-level chronic exposure may cause permanent neurological damage. Typically, upon removal from exposure to carbon monoxide, symptoms usually resolve themselves, unless there has been an episode of severe acute poisoning. However, one case noted permanent memory loss and learning problems after a 3-year exposure to relatively low levels of carbon monoxide from a faulty furnace. Chronic exposure may worsen cardiovascular symptoms in some people. Chronic carbon monoxide exposure might increase the risk of developing atherosclerosis. Long-term exposures to carbon monoxide present the greatest risk to persons with coronary heart disease and in females who are pregnant.
Carbon monoxide as a therapeutic agent
Small amounts of CO are beneficial and enzymes exist that produce it at times of oxidative stress. Drugs are being developed to introduce small amounts of CO during certain kinds of surgery, these drugs are called Carbon monoxide-releasing molecules.
|0.1 ppm||Natural atmosphere level (MOPITT)|
|0.5 to 5 ppm||Average level in homes|
|5 to 15 ppm||Near properly adjusted gas stoves in homes|
|100 to 200 ppm||Exhaust from automobiles in the Mexico City central area|
|5,000 ppm||Exhaust from a home wood fire|
|7,000 ppm||Undiluted warm car exhaust without a catalytic converter|
Carbon monoxide is a product of combustion of organic matter under conditions of restricted oxygen supply, which prevents complete oxidation to carbon dioxide (CO2). Sources of carbon monoxide include cigarette smoke, house fires, faulty furnaces, heaters, wood-burning stoves, internal combustion vehicle exhaust, electrical generators, propane-fueled equipment such as portable stoves, and gasoline-powered tools such as leaf blowers, lawn mowers, high-pressure washers, concrete cutting saws, power trowels, and welders. Exposure typically occurs when equipment is used in buildings or semi-enclosed spaces.
Poisoning may also occur following the use of a self-contained underwater breathing apparatus (SCUBA) due to faulty diving air compressors. Riding in pickup trucks has led to poisoning in children. Idling automobiles with the exhaust pipe blocked by snow has led to the poisoning of car occupants. Generators and propulsion engines on boats, especially houseboats, has resulted in fatal carbon monoxide exposures. As part of the Holocaust during World War II, German Nazis used gas vans to kill an estimated 700,000 prisoners by carbon monoxide poisoning. This method was also used in the gas chambers of several death camps.
Another source of poisoning is exposure to the organic solvent dichloromethane, found in some paint strippers, as the metabolism of dichloromethane produces carbon monoxide. In most light aircraft and some cars the cabin heating system comprises a shroud around the exhaust. Any perforation between the exhaust manifold and shroud can result in exhaust gases reaching the cabin. In caves carbon monoxide can build up in enclosed chambers due to the presence of decomposing organic matter.
The precise mechanisms by which the effects of carbon monoxide are induced upon bodily systems, are complex and not yet fully understood. Known mechanisms include carbon monoxide binding to hemoglobin, myoglobin and mitochondrial cytochrome oxidase and restricting oxygen supply, and carbon monoxide causing brain lipid peroxidation.
Carbon monoxide has a higher diffusion coefficient compared to oxygen and the only enzyme in the human body that produces carbon monoxide is heme oxygenase which is located in all cells and breaks down heme. Under normal conditions carbon monoxide levels in the plasma are approximately 0 mmHg because it has a higher diffusion coefficient and the body easily gets rid of any CO made. When CO is not ventilated it binds to hemoglobin, which is the principal oxygen-carrying compound in blood; this produces a compound known as carboxyhemoglobin. The traditional belief is that carbon monoxide toxicity arises from the formation of carboxyhemoglobin, which decreases the oxygen-carrying capacity of the blood and inhibits the transport, delivery, and utilization of oxygen by the body. The affinity between hemoglobin and carbon monoxide is approximately 230 times stronger than the affinity between hemoglobin and oxygen so hemoglobin binds to carbon monoxide in preference to oxygen.
Hemoglobin is a tetramer with four oxygen binding sites. The binding of carbon monoxide at one of these sites increases the oxygen affinity of the remaining three sites, which causes the hemoglobin molecule to retain oxygen that would otherwise be delivered to the tissue. This situation is described as carbon monoxide shifting the oxygen dissociation curve to the left. Because of the increased affinity between hemoglobin and oxygen during carbon monoxide poisoning, little oxygen will actually be released in the tissues. This causes hypoxic tissue injury. Hemoglobin acquires a bright red color when converted into carboxyhemoglobin, so poisoned cadavers and even commercial meats treated with carbon monoxide acquire an unnatural reddish hue.
Carbon monoxide also binds to the hemeprotein myoglobin. It has a high affinity for myoglobin, about 60 times greater than that of oxygen. Carbon monoxide bound to myoglobin may impair its ability to utilize oxygen. This causes reduced cardiac output and hypotension, which may result in brain ischemia. A delayed return of symptoms have been reported. This results following a recurrence of increased carboxyhemoglobin levels; this effect may be due to a late release of carbon monoxide from myoglobin, which subsequently binds to hemoglobin.
Another mechanism involves effects on the mitochondrial respiratory enzyme chain that is responsible for effective tissue utilization of oxygen. Carbon monoxide binds to cytochrome oxidase with less affinity than oxygen, so it is possible that it requires significant intracellular hypoxia before binding. This binding interferes with aerobic metabolism and efficient adenosine triphosphate synthesis. Cells respond by switching to anaerobic metabolism, causing anoxia, lactic acidosis, and eventual cell death. The rate of dissociation between carbon monoxide and cytochrome oxidase is slow, causing a relatively prolonged impairment of oxidative metabolism.
Central nervous system effects
The mechanism that is thought to have a significant influence on delayed effects involves formed blood cells and chemical mediators, which cause brain lipid peroxidation (degradation of unsaturated fatty acids). Carbon monoxide causes endothelial cell and platelet release of nitric oxide, and the formation of oxygen free radicals including peroxynitrite. In the brain this causes further mitochondrial dysfunction, capillary leakage, leukocyte sequestration, and apoptosis. The result of these effects is lipid peroxidation, which causes delayed reversible demyelinization of white matter in the central nervous system known as Grinker myelinopathy, which can lead to edema and necrosis within the brain. This brain damage occurs mainly during the recovery period. This may result in cognitive defects, especially affecting memory and learning, and movement disorders. These disorders are typically related to damage to the cerebral white matter and basal ganglia. Hallmark pathological changes following poisoning are bilateral necrosis of the white matter, globus pallidus, cerebellum, hippocampus and the cerebral cortex.
Carbon monoxide poisoning in pregnant women may cause severe adverse fetal effects. Poisoning causes fetal tissue hypoxia by decreasing the release of maternal oxygen to the fetus. Carbon monoxide also crosses the placenta and combines with fetal hemoglobin, causing more direct fetal tissue hypoxia. Additionally, fetal hemoglobin has a 10 to 15% higher affinity for carbon monoxide than adult hemoglobin, causing more severe poisoning in the fetus than in the adult. Elimination of carbon monoxide is slower in the fetus, leading to an accumulation of the toxic chemical. The level of fetal morbidity and mortality in acute carbon monoxide poisoning is significant, so despite mild maternal poisoning or following maternal recovery, severe fetal poisoning or death may still occur.
As many symptoms of carbon monoxide poisoning also occur with many other types of poisonings and infections (such as the flu), the diagnosis is often difficult. A history of potential carbon monoxide exposure, such as being exposed to a residential fire, may suggest poisoning, but the diagnosis is confirmed by measuring the levels of carbon monoxide in the blood. This can be determined by measuring the amount of carboxyhemoglobin compared to the amount of hemoglobin in the blood.
As people may continue to experience significant symptoms of CO poisoning long after their blood carboxyhemoglobin concentration has returned to normal, presenting to examination with a normal carboxyhemoglobin level (which may happen in late states of poisoning) does not rule out poisoning.
A CO-oximeter is used to determine carboxyhemoglobin levels. Pulse CO-oximeters estimate carboxyhemoglobin with a non-invasive finger clip similar to a pulse oximeter. These devices function by passing various wavelengths of light through the fingertip and measuring the light absorption of the different types of hemoglobin in the capillaries.
The use of a regular pulse oximeter is not effective in the diagnosis of carbon monoxide poisoning as people suffering from carbon monoxide poisoning may have a normal oxygen saturation level on a pulse oximeter. This is due to the carboxyhemoglobin being misrepresented as oxyhemoglobin.
Breath CO monitoring offers a viable alternative to pulse CO-oximetry. Carboxyhemoglobin levels have been shown to have a strong correlation with breath CO concentration. However, many of these devices require the user to inhale deeply and hold their breath to allow the CO in the blood to escape into the lung before the measurement can be made. As this is not possible in a nonresponsive patient, these devices are not appropriate for use in on-scene emergency care detection of CO poisoning.
There are many conditions to be considered in the differential diagnosis of carbon monoxide poisoning. The earliest symptoms, especially from low level exposures, are often non-specific and readily confused with other illnesses, typically flu-like viral syndromes, depression, chronic fatigue syndrome, chest pain, and migraine or other headaches. Carbon monoxide has been called a "great mimicker" due to the presentation of poisoning being diverse and nonspecific. Other conditions included in the differential diagnosis include acute respiratory distress syndrome, altitude sickness, lactic acidosis, diabetic ketoacidosis, meningitis, methemoglobinemia, or opioid or toxic alcohol poisoning.
Detection in biological specimens
Carbon monoxide may be quantitated in blood using spectrophotometric methods or chromatographic techniques in order to confirm a diagnosis of poisoning in a person or to assist in the forensic investigation of a case of fatal exposure. Carboxyhemoglobin blood saturations may range up to 8–10% in heavy smokers or persons extensively exposed to automotive exhaust gases. In symptomatic poisoned people they are often in the 10–30% range, while persons who succumb may have postmortem blood levels of 30–90%.
Naturally-occurring and beneficial effects of CO
Carbon monoxide is produced naturally by the body as a byproduct of converting protoporphyrin into bilirubin. This carbon monoxide also combines with hemoglobin to make carboxyhemoglobin, but not at toxic levels. In fact exploratory therapies include administering carbon monoxide to the patient using carbon monoxide-releasing molecules. The ratio of carboxyhemoglobin to hemoglobin molecules in an average person may be up to 5%, although cigarette smokers who smoke two packs/day may have levels up to 9%.
Carbon monoxide detector recommendations for buildings
Prevention remains a vital public health issue, requiring public education on the safe operation of appliances, heaters, fireplaces, and internal-combustion engines, as well as increased emphasis on the installation of carbon monoxide detectors. Carbon monoxide is tasteless and odourless so can not be detected by smell.
The United States Consumer Product Safety Commission has stated, "carbon monoxide detectors are as important to home safety as smoke detectors are," and recommends each home have at least one carbon monoxide detector, and preferably one on each level of the building. These devices, which are relatively inexpensive and widely available, are either battery- or AC-powered, with or without battery backup. In buildings, carbon monoxide detectors are usually installed around heaters and other equipment. If a relatively high level of carbon monoxide is detected, the device sounds an alarm, giving people the chance to evacuate and ventilate the building. Unlike smoke detectors, carbon monoxide detectors do not need to be placed near ceiling level.
The use of carbon monoxide detectors has been standardized in many areas. In the USA, NFPA 720-2009, the carbon monoxide detector guidelines published by the National Fire Protection Association, mandates the placement of carbon monoxide detectors/alarms on every level of the residence, including the basement, in addition to outside sleeping areas. In new homes, AC-powered detectors must have battery backup and be interconnected to ensure early warning of occupants at all levels. NFPA 720-2009 is the first national carbon monoxide standard to address devices in non-residential buildings. These guidelines, which now pertain to schools, healthcare centers, nursing homes and other non-residential buildings, includes three main points:
- 1. A secondary power supply (battery backup) must operate all carbon monoxide notification appliances for at least 12 hours,
- 2. Detectors must be on the ceiling in the same room as permanently installed fuel-burning appliances, and
- 3. Detectors must be located on every habitable level and in every HVAC zone of the building.
The NFPA standard is not necessarily enforced by law. As of April 2006, the U.S. state of Massachusetts require detectors to be present in all residences with potential CO sources, regardless of building age and whether they are owner-occupied or rented. This is enforced by municipal inspectors, and was inspired by the death of 7-year-old Nicole Garofalo in 2005 due to snow blocking a home heating vent. Other jurisdictions may have no requirement or only mandate detectors for new construction or at time of sale.
Despite similar deaths in vehicles with clogged exhaust pipes (for example in the Northeastern United States blizzard of 1978 and February 2013 nor'easter) and the commercial availability of the equipment, there is no legal requirement for automotive CO detectors.
Gas organizations will often recommend to get gas appliances serviced at least once a year.
Recommended World Health Organisation (WHO) Air Quality guidelines for Europe 2000
The following guideline values (ppm values rounded) and periods of time-weighted average exposures have been determined in such a way that the carboxyhaemoglobin (COHb) level of 2.5% is not exceeded, even when a normal subject engages in light or moderate exercise:
- 100 mg/m3 (87 ppm) for 15 min
- 60 mg/m3 (52 ppm) for 30 min
- 30 mg/m3 (26 ppm) for 1 h
- 10 mg/m3 (9 ppm) for 8 h
Recommended WHO European Guidelines for Indoor Air Quality 2010
- 7 mg/m3 (6 ppm) for 24 h (so as not to exceed 2% COHb for chronic exposure)
Initial treatment for carbon monoxide poisoning is to immediately remove the person from the exposure without endangering further people. Those who are unconscious may require CPR on site. Administering oxygen via non-rebreather mask shortens the half life of carbon monoxide to 80 minutes from 320 minutes on normal air. Oxygen hastens the dissociation of carbon monoxide from carboxyhemoglobin, thus turning it back into hemoglobin. Due to the possible severe effects in the fetus, pregnant women are treated with oxygen for longer periods of time than non-pregnant people.
Hyperbaric oxygen is also used in the treatment of carbon monoxide poisoning, as it may hasten dissociation of CO from carboxyhemoglobin and cytochrome oxidase to a greater extent than normal oxygen. Hyperbaric oxygen at three times atmospheric pressure reduces the half life of carbon monoxide to 23 (~80/3 minutes) minutes, compared to 80 minutes for regular oxygen. It may also enhance oxygen transport to the tissues by plasma, partially bypassing the normal transfer through hemoglobin. However it is controversial whether hyperbaric oxygen actually offers any extra benefits over normal high flow oxygen, in terms of increased survival or improved long-term outcomes. There have been randomized controlled trials in which the two treatment options have been compared; of the six performed, four found hyperbaric oxygen improved outcome and two found no benefit for hyperbaric oxygen. Some of these trials have been criticized for apparent flaws in their implementation. A review of all the literature on carbon monoxide poisoning treatment concluded that the role of hyperbaric oxygen is unclear and the available evidence neither confirms nor denies a medically meaningful benefit. The authors suggested a large, well designed, externally audited, multicentre trial to compare normal oxygen with hyperbaric oxygen.
Further treatment for other complications such as seizure, hypotension, cardiac abnormalities, pulmonary edema, and acidosis may be required. Increased muscle activity and seizures should be treated with dantrolene or diazepam; diazepam should only be given with appropriate respiratory support. Hypotension requires treatment with intravenous fluids; vasopressors may be required to treat myocardial depression. Cardiac dysrhythmias are treated with standard advanced cardiac life support protocols. If severe, metabolic acidosis is treated with sodium bicarbonate. Treatment with sodium bicarbonate is controversial as acidosis may increase tissue oxygen availability. Treatment of acidosis may only need to consist of oxygen therapy. The delayed development of neuropsychiatric impairment is one of the most serious complications of carbon monoxide poisoning. Brain damage is confirmed following MRI or CAT scans. Extensive follow up and supportive treatment is often required for delayed neurological damage. Outcomes are often difficult to predict following poisoning, especially people who have symptoms of cardiac arrest, coma, metabolic acidosis, or have high carboxyhemoglobin levels. One study reported that approximately 30% of people with severe carbon monoxide poisoning will have a fatal outcome. It has been reported that electroconvulsive therapy (ECT) may increase the likelihood of delayed neuropsychiatric sequelae (DNS) after carbon monoxide (CO) poisoning.
The true number of incidents of carbon monoxide poisoning is unknown, since many non-lethal exposures go undetected. From the available data, carbon monoxide poisoning is the most common cause of injury and death due to poisoning worldwide. Poisoning is typically more common during the winter months. This is due to increased domestic use of gas furnaces, gas or kerosene space heaters, and kitchen stoves during the winter months, which if faulty and/or used without adequate ventilation, may produce excessive carbon monoxide. Carbon monoxide detection and poisoning also increases during power outages.
It has been estimated that more than 40,000 people per year seek medical attention for carbon monoxide poisoning in the United States. In many industrialized countries carbon monoxide is the cause of more than 50% of fatal poisonings. In the United States, approximately 200 people die each year from carbon monoxide poisoning associated with home fuel-burning heating equipment. Carbon monoxide poisoning contributes to the approximately 5613 smoke inhalation deaths each year in the United States. The CDC reports, "Each year, more than 500 Americans die from unintentional carbon monoxide poisoning, and more than 2,000 commit suicide by intentionally poisoning themselves." For the 10-year period from 1979 to 1988, 56,133 deaths from carbon monoxide poisoning occurred in the United States, with 25,889 of those being suicides, leaving 30,244 unintentional deaths. A report from New Zealand showed that 206 people died from carbon monoxide poisoning in the years of 2001 and 2002. In total carbon monoxide poisoning was responsible for 43.9% of deaths by poisoning in that country. In South Korea, 1,950 people had been poisoned by carbon monoxide with 254 deaths from 2001 through 2003. A report from Jerusalem showed 3.53 per 100,000 people were poisoned annually from 2001 through 2006. in Hubei, China, 218 deaths from poisoning were reported over a 10-year period with 16.5% being from carbon monoxide exposure.
Before the 1960s, most domestic gas supply in the United Kingdom was coal gas (alternatively known as town gas), which in its unburned form contained high levels of carbon monoxide. Carbon monoxide poisoning by intentionally inhaling coal gas was a common suicide method, accounting for nearly half of all suicides in the United Kingdom in the late 1950s. After the British government phased out coal gas in favor of natural gas in the 1960s, the suicide rate in Britain fell by almost a third and has not risen since. The use of coal gas as a suicide method has declined as most domestic gas supply worldwide is now natural gas, which lacks carbon monoxide. Until the invention of catalytic converters, suicide has been committed by inhaling the exhaust fumes of a running car engine, particularly in an enclosed space such as a garage. Before 1975, motor car exhaust contained 4–10% carbon monoxide, but newer cars have catalytic converters that eliminate over 99% of the carbon monoxide produced. However, even cars with catalytic converters can produce substantial amounts of carbon monoxide if an idling car is left in an enclosed space such as a closed garage.
As carbon monoxide poisoning via car exhaust has become less of a suicide option, there has been an increase in new methods of carbon monoxide poisoning such as burning charcoal, or fossil fuels, or by combining formic acid and sulfuric acid, within a confined space. Such incidents have occurred mostly in connection with group suicide pacts in Asian countries such as Japan, Taiwan, and Hong Kong, but are starting to occur in western countries as well, such as the 2007 suicide of Boston lead singer Brad Delp.
- Carbon monoxide breath monitor
- John Scott Haldane
- Undersea and Hyperbaric Medical Society
- Deaths from carbon monoxide poisoning
- Prockop LD, Chichkova RI (Nov 2007). "Carbon monoxide intoxication: an updated review". Journal of the Neurological Sciences 262 (1–2): 122–130. doi:10.1016/j.jns.2007.06.037. PMID 17720201.
- Buckley NA, Isbister GK, Stokes B, Juurlink DN (2005). "Hyperbaric oxygen for carbon monoxide poisoning: a systematic review and critical analysis of the evidence". Toxicological Reviews 24 (2): 75–92. doi:10.2165/00139709-200524020-00002. PMID 16180928.
- Omaye ST (Nov 2002). "Metabolic modulation of carbon monoxide toxicity". Toxicology 180 (2): 139–50. doi:10.1016/S0300-483X(02)00387-6. PMID 12324190.
- Albert Donnay (October 31, 2004). "A True Tale Of A Truly Haunted House". Ghostvillage.com. Retrieved 2008-12-16.
- Ernst A, Zibrak JD (November 1998). "Carbon monoxide poisoning". The New England Journal of Medicine 339 (22): 1603–1608. doi:10.1056/NEJM199811263392206. PMID 9828249.
- Raub JA, Mathieu-Nolf M, Hampson NB, Thom SR (April 2000). "Carbon monoxide poisoning-a public health perspective". Toxicology 145 (1): 1–14. doi:10.1016/S0300-483X(99)00217-6. PMID 10771127.
- Kao LW, Nañagas KA (March 2006). "Toxicity associated with carbon monoxide". Clinics in Laboratory Medicine 26 (1): 99–125. doi:10.1016/j.cll.2006.01.005. PMID 16567227.
- "OSHA Fact Sheet: Carbon Monoxide". United States National Institute for Occupational Safety and Health. Retrieved 2009-09-14.
- "Carbon monoxide – 29 CFR Part 1917 Section 1917.24". United States Department of Labor: Occupational Safety and Health Administration. Retrieved 2013-05-27.
- Henry CR, Satran D, Lindgren B, Adkinson C, Nicholson CI, Henry TD (January 2006). "Myocardial Injury and Long-term Mortality Following Moderate to Severe Carbon Monoxide Poisoning" (Free full text). JAMA 295 (4): 398–402. doi:10.1001/jama.295.4.398. PMID 16434630.
- "Carbon Monoxide". American Lung Association. Archived from the original on 2008-05-28. Retrieved 2009-09-14.
- Lipman GS (2006). "Carbon monoxide toxicity at high altitude". Wilderness & Environmental Medicine 17 (2): 144–145. doi:10.1580/1080-6032(2006)17[144:CMTAHA]2.0.CO;2. PMID 16805152.
- first draft prepared by Mr J. Raub. (1999). Environmental Health Criteria 213 (Carbon Monoxide). Geneva: International Programme on Chemical Safety, World Health Organization. ISBN 92-4-157213-2.
- Goldstein M (December 2008). "Carbon monoxide poisoning". Journal of Emergency Nursing: JEN: Official Publication of the Emergency Department Nurses Association 34 (6): 538–542. doi:10.1016/j.jen.2007.11.014. PMID 19022078.
- Struttmann T, Scheerer A, Prince TS, Goldstein LA (Nov 1998). "Unintentional carbon monoxide poisoning from an unlikely source". The Journal of the American Board of Family Practice 11 (6): 481–484. doi:10.3122/jabfm.11.6.481. PMID 9876005.
- Hardy KR, Thom SR (1994). "Pathophysiology and treatment of carbon monoxide poisoning". Journal of Toxicology. Clinical Toxicology 32 (6): 613–629. doi:10.3109/15563659409017973. PMID 7966524.
- Lewis Goldfrank; Neal Flomenbaum; Neal Lewin; Mary Ann Howland; Robert Hoffman; Lewis Nelson (2002). "Carbon Monoxide". Goldfrank's toxicologic emergencies (7th ed.). New York: McGraw-Hill. pp. 1689–1704. ISBN 0-07-136001-8.
- Hampson NB, Hampson LA (March 2002). "Characteristics of headache associated with acute carbon monoxide poisoning". Headache 42 (3): 220–223. doi:10.1046/j.1526-4610.2002.02055.x. PMID 11903546.
- Choi IS (June 2001). "Carbon monoxide poisoning: systemic manifestations and complications" (Free full text). Journal of Korean Medical Science 16 (3): 253–261. PMC 3054741. PMID 11410684.
- Tritapepe L, Macchiarelli G, Rocco M, Scopinaro F, Schillaci O, Martuscelli E, Motta PM (April 1998). "Functional and ultrastructural evidence of myocardial stunning after acute carbon monoxide poisoning". Critical Care Medicine 26 (4): 797–801. doi:10.1097/00003246-199804000-00034. PMID 9559621.
- Weaver LK (March 2009). "Clinical practice. Carbon monoxide poisoning". The New England Journal of Medicine 360 (12): 1217–1225. doi:10.1056/NEJMcp0808891. PMID 19297574.
- Shochat, Guy N (17 February 2009). "Toxicity, Carbon Monoxide". emedicine. Retrieved 2009-04-27.
- Marius-Nunez AL (February 1990). "Myocardial infarction with normal coronary arteries after acute exposure to carbon monoxide". Chest 97 (2): 491–4. doi:10.1378/chest.97.2.491. PMID 2298080.
- Gandini C, Castoldi AF, Candura SM, Locatelli C, Butera R, Priori S, Manzo L (2001). "Carbon monoxide cardiotoxicity". Journal of Toxicology. Clinical Toxicology 39 (1): 35–44. doi:10.1081/CLT-100102878. PMID 11327225.
- Sokal JA (December 1985). "The effect of exposure duration on the blood level of glucose, pyruvate and lactate in acute carbon monoxide intoxication in man". Journal of Applied Toxicology: JAT 5 (6): 395–7. doi:10.1002/jat.2550050611. PMID 4078220.
- Choi IS (July 1983). "Delayed neurologic sequelae in carbon monoxide intoxication". Archives of Neurology 40 (7): 433–435. doi:10.1001/archneur.1983.04050070063016. PMID 6860181.
- Roohi F, Kula RW, Mehta N (July 2001). "Twenty-nine years after carbon monoxide intoxication". Clinical Neurology and Neurosurgery 103 (2): 92–95. doi:10.1016/S0303-8467(01)00119-6. PMID 11516551.
- Myers RA, Snyder SK, Emhoff TA (December 1985). "Subacute sequelae of carbon monoxide poisoning". Annals of Emergency Medicine 14 (12): 1163–1167. doi:10.1016/S0196-0644(85)81022-2. PMID 4061987.
- Bateman DN (October 2003). "Carbon Monoxide". Medicine 31 (10): 233. doi:10.1383/medc.188.8.131.52810.
- Simini B (October 1998). "Cherry-red discolouration in carbon monoxide poisoning". Lancet 352 (9134): 1154. doi:10.1016/S0140-6736(05)79807-X. PMID 9798630.
- Brooks DE, Lin E, Ahktar J (February 2002). "What is cherry red, and who cares?". The Journal of Emergency Medicine 22 (2): 213–214. doi:10.1016/S0736-4679(01)00469-3. PMID 11858933.
- Fawcett TA, Moon RE, Fracica PJ, Mebane GY, Theil DR, Piantadosi CA (January 1992). "Warehouse workers' headache. Carbon monoxide poisoning from propane-fueled forklifts". Journal of Occupational Medicine 34 (1): 12–15. PMID 1552375.
- Ryan CM (1990). "Memory disturbances following chronic, low-level carbon monoxide exposure". Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists 5 (1): 59–67. doi:10.1016/0887-6177(90)90007-C. PMID 14589544.
- Davutoglu, V (November 2009). "Chronic carbon monoxide exposure is associated with the increases in carotid intima-media thickness and C-reactive protein level". Tohoku J Exp Med 219 (3): 201–6. doi:10.1620/tjem.219.201.
- Shephard, Roy (1983). Carbon Monoxide The Silent Killer. Springfield Illinois: Charles C Thomas. pp. 93–96.
- Allred EN, Bleecker ER, Chaitman BR, Dahms TE, Gottlieb SO, Hackney JD, Pagano M, Selvester RH, Walden SM, Warren J (Nov 1989). "Short-term effects of carbon monoxide exposure on the exercise performance of subjects with coronary artery disease". The New England Journal of Medicine 321 (21): 1426–1432. doi:10.1056/NEJM198911233212102. PMID 2682242.
- Committee on Medical and Biological Effects of Environmental Pollutants (1977). Carbon Monoxide. Washington, D.C.: National Academy of Sciences. p. 29. ISBN 0-309-02631-8.
- Green W. "An Introduction to Indoor Air Quality: Carbon Monoxide (CO)". United States Environmental Protection Agency. Retrieved 2008-12-16.
- Singer, Siegfried Fred. The Changing Global Environment. Dordrecht: D. Reidel Publishing Company. p. 90.
- Gosink T (1983-01-28). "What Do Carbon Monoxide Levels Mean?". Alaska Science Forum. Geophysical Institute, University of Alaska Fairbanks. Retrieved 2008-12-16.
- Marc B, Bouchez-Buvry A, Wepierre JL, Boniol L, Vaquero P, Garnier M (June 2001). "Carbon-monoxide poisoning in young drug addicts due to indoor use of a gasoline-powered generator". Journal of Clinical Forensic Medicine 8 (2): 54–56. doi:10.1054/jcfm.2001.0474. PMID 16083675.
- Johnson C, Moran J, Paine S, Anderson H, Breysse P (October 1975). "Abatement of toxic levels of carbon monoxide in Seattle ice-skating rinks". American Journal of Public Health 65 (10): 1087–1090. doi:10.2105/AJPH.65.10.1087. PMC 1776025. PMID 1163706.
- "NIOSH Carbon Monoxide Hazards from Small Gasoline Powered Engines". United States National Institute for Occupational Safety and Health. Retrieved 2007-10-15.
- Fife CE, Smith LA, Maus EA, McCarthy JJ, Koehler MZ, Hawkins T, Hampson NB (June 2009). "Dying to play video games: carbon monoxide poisoning from electrical generators used after hurricane Ike". Pediatrics 123 (6): e1035–8. doi:10.1542/peds.2008-3273. PMID 19482736.
- Emmerich, SJ (July 2011). Measured CO Concentrations at NIST IAQ Test House from Operation of Portable Electric Generators in Attached Garage – Interim Report (Report). United States National Institute of Standards and Technology. http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907771. Retrieved 2012-04-18.
- Austin CC, Ecobichon DJ, Dussault G, Tirado C (December 1997). "Carbon monoxide and water vapor contamination of compressed breathing air for firefighters and divers". Journal of Toxicology and Environmental Health 52 (5): 403–423. doi:10.1080/00984109708984073. PMID 9388533.
- Hampson NB, Norkool DM (January 1992). "Carbon monoxide poisoning in children riding in the back of pickup trucks". JAMA 267 (4): 538–540. doi:10.1001/jama.267.4.538. PMID 1370334.
- Centers for Disease Control and Prevention (CDC) (January 1996). "Carbon monoxide poisonings associated with snow-obstructed vehicle exhaust systems—Philadelphia and New York City, January 1996". MMWR: Morbidity and Mortality Weekly Report 45 (1): 1–3. PMID 8531914.
- Centers for Disease Control and Prevention (CDC) (December 2000). "Houseboat-associated carbon monoxide poisonings on Lake Powell—Arizona and Utah, 2000". MMWR: Morbidity and Mortality Weekly Report 49 (49): 1105–1108. PMID 11917924.
- "NIOSH Carbon Monoxide Dangers in Boating". United States National Institute for Occupational Safety and Health. Retrieved 2007-10-15.
- Samule Totten, Paul Bartrop, Eric Markusen (2007). Dictionary of Genocide. Greenwood. pp. 129, 156.
- van Veen, MP; Fortezza F; Spaans E; Mensinga TT (2002). "Non-professional paint stripping, model prediction and experimental validation of indoor dichloromethane levels". Indoor Air 12 (2): 92–7. doi:10.1034/j.1600-0668.2002.01109.x.
- Kubic VL, Anders MW (March 1975). "Metabolism of dihalomethanes to carbon monoxide. II. In vitro studies". Drug metabolism and disposition 3 (2): 104–112. PMID 236156.
- Dueñas A, Felipe S, Ruiz-Mambrilla M, Martín-Escudero JC, García-Calvo C (January 2000). "CO poisoning caused by inhalation of CH3Cl contained in personal defense spray". The American Journal of Emergency Medicine 18 (1): 120–121. doi:10.1016/S0735-6757(00)90070-6. PMID 10674554.
- Varon J, Marik PE, Fromm RE Jr, Gueler A (1999). "Carbon monoxide poisoning: a review for clinicians". The Journal of Emergency Medicine 17 (1): 87–93. doi:10.1016/S0736-4679(98)00128-0. PMID 9950394.
- Dart, RC (2004). Medical toxicology. Philadelphia: Williams & Wilkins. p. 1169. ISBN 0-7817-2845-2.
- Gorman D, Drewry A, Huang YL, Sames C (May 2003). "The clinical toxicology of carbon monoxide". Toxicology 187 (1): 25–38. doi:10.1016/S0300-483X(03)00005-2. PMID 12679050.
- Dunn, Robert B.; Kudrath, W., Passo S.S., Wilson, L.B. (2011). "7-3". USMLE Step 1 Lecture Notes: Physiology. pp. 167–168.
- Townsend CL, Maynard RL (October 2002). "Effects on health of prolonged exposure to low concentrations of carbon monoxide". Occupational and Environmental Medicine 59 (10): 708–711. doi:10.1136/oem.59.10.708. PMC 1740215. PMID 12356933.
- Haldane J (1895). "The action of carbonic oxide on man". The Journal of Physiology 18 (5–6): 430–462. PMC 1514663. PMID 16992272.
- Gorman DF, Runciman WB (November 1991). "Carbon monoxide poisoning". Anaesthesia and Intensive Care 19 (4): 506–11. PMID 1750629.
- Alonso JR, Cardellach F, Lopez S, Casademont J, Miro O. (September 2003). "Carbon monoxide specifically inhibits cytochrome c oxidase of human mitochondrial respiratory chain". Pharmacology & Toxicology 93 (3): 142–146. doi:10.1034/j.1600-0773.2003.930306.x. PMID 12969439.
- Blumenthal I (June 2001). "Carbon monoxide poisoning" (Free full text). Journal of the Royal Society of Medicine 94 (6): 270–272. PMC 1281520. PMID 11387414.
- Fan HC, Wang AC, Lo CP, Chang KP, Chen SJ (July 2009). "Damage of cerebellar white matter due to carbon monoxide poisoning: a case report". The American Journal of Emergency Medicine 27 (6): 757.e5–e7. doi:10.1016/j.ajem.2008.10.021. PMID 19751650.
- Fukuhara M, Abe I, Matsumura K, Kaseda S, Yamashita Y, Shida K, Kawashima H, Fujishima M (April 1996). "Circadian variations of blood pressure in patients with sequelae of carbon monoxide poisoning". American Journal of Hypertension 9 (4 Part 1): 300–305. doi:10.1016/0895-7061(95)00342-8. PMID 8722431.
- Greingor JL, Tosi JM, Ruhlmann S, Aussedat M (September 2001). "Acute carbon monoxide intoxication during pregnancy. One case report and review of the literature". Emergency Medicine Journal: EMJ 18 (5): 399–401. doi:10.1136/emj.18.5.399. PMC 1725677. PMID 11559621.
- Farrow JR, Davis GJ, Roy TM, McCloud LC, Nichols GR (November 1990). "Fetal death due to nonlethal maternal carbon monoxide poisoning". Journal of Forensic Sciences 35 (6): 1448–1452. PMID 2262778.
- Bennetto L, Powter L, Scolding NJ (April 2008). "Accidental carbon monoxide poisoning presenting without a history of exposure: A case report". Journal of Medical Case Reports 2 (1): 118. doi:10.1186/1752-1947-2-118. PMC 2390579. PMID 18430228.
- Keleş A, Demircan A, Kurtoğlu G (June 2008). "Carbon monoxide poisoning: how many patients do we miss?". European Journal of Emergency Medicine 15 (3): 154–157. doi:10.1097/MEJ.0b013e3282efd519. PMID 18460956.
- Rodkey FL, Hill TA, Pitts LL, Robertson RF (August 1979). "Spectrophotometric measurement of carboxyhemoglobin and methemoglobin in blood". Clinical Chemistry 25 (8): 1388–1393. PMID 455674. Retrieved 2009-07-17.
- Rees PJ, Chilvers C, Clark TJ (January 1980). "Evaluation of methods used to estimate inhaled dose of carbon monoxide". Thorax 35 (1): 47–51. doi:10.1136/thx.35.1.47. PMC 471219. PMID 7361284.
- Coulange M, Barthelemy A, Hug F, Thierry AL, De Haro L (March 2008). "Reliability of new pulse CO-oximeter in victims of carbon monoxide poisoning". Undersea & Hyperbaric Medicine 35 (2): 107–111. PMID 18500075.
- Maisel, William; Roger J. Lewis (2010). "Noninvasive Measurement of Carboxyhemoglobin: How Accurate is Accurate Enough?". Annals of Emergency Medicine (Boston, MA) 56 (4): 389–391. doi:10.1016/j.annemergmed.2010.05.025.
- Vegfors M, Lennmarken C (May 1991). "Carboxyhaemoglobinaemia and pulse oximetry". British Journal of Anaesthesia 66 (5): 625–626. doi:10.1093/bja/66.5.625. PMID 2031826.
- Barker SJ, Tremper KK (May 1987). "The effect of carbon monoxide inhalation on pulse oximetry and transcutaneous PO2". Anesthesiology 66 (5): 677–679. doi:10.1097/00000542-198705000-00014. PMID 3578881.
- Jarvis, M. (1986). "Low cost carbon monoxide monitors in smoking assessment". Thorax: 886–887.
- Wald, Nicholas (1981). "Carbon monoxide in breath in relation to smoking and carboxyhaemoglobin levels". Thorax: 366–369.
- Ilano AL, Raffin TA (Jan 1990). "Management of carbon monoxide poisoning" (Free full text). Chest 97 (1): 165–9. doi:10.1378/chest.97.1.165. PMID 2403894.
- Sato K, Tamaki K, Hattori H, et al. Determination of total hemoglobin in forensic blood samples with special reference to carboxyhemoglobin analysis. For. Sci. Int. 48: 89–96, 1990.
- R. Baselt, Disposition of Toxic Drugs and Chemicals in Man, 8th edition, Biomedical Publications, Foster City, CA, 2008, pp. 237–241.
- Ford MD, Delaney KA, Ling LJ, Erickson T, ed. (2001). Clinical toxicology. WB Saunders Company. p. 1046. ISBN 0-7216-5485-1.
- Millar IL; Mouldey PG (2008). "Compressed breathing air – the potential for evil from within.". Diving and Hyperbaric Medicine. (South Pacific Underwater Medicine Society) 38: 145–51. Retrieved 2013-04-14.
- "Carbon Monoxide Detectors Can Save Lives: CPSC Document #5010". US Consumer Product Safety Commission. Archived from the original on 2009-04-09. Retrieved 2009-04-30.
- Krenzelok EP, Roth R, Full R (September 1996). "Carbon monoxide ... the silent killer with an audible solution". The American Journal of Emergency Medicine 14 (5): 484–486. doi:10.1016/S0735-6757(96)90159-X. PMID 8765117.
- Lipinski, Edward R (February 14, 1999). "Keeping Watch on Carbon Monoxide". New York Times. Retrieved 2009-09-09.
- Yoon SS, Macdonald SC, Parrish RG (March 1998). "Deaths from unintentional carbon monoxide poisoning and potential for prevention with carbon monoxide detectors". JAMA 279 (9): 685–687. doi:10.1001/jama.279.9.685. PMID 9496987.
- "Carbon Monoxide Detector Placement". homesafe.com. Retrieved 2013-05-27.
- NFPA 720: Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment. Quincy, MA: National Fire Protection Agency. 2009.
- MGL Ch. 148 §28F1⁄2 – Nicole's Law, effective March 31, 2006
- "Gas Safety in the Home". UK Gas Safe Register. Retrieved 2013-05-27.
- Olson KR (1984). "Carbon monoxide poisoning: mechanisms, presentation, and controversies in management". The Journal of Emergency Medicine 1 (3): 233–243. doi:10.1016/0736-4679(84)90078-7. PMID 6491241.
- Margulies JL (November 1986). "Acute carbon monoxide poisoning during pregnancy". The American Journal of Emergency Medicine 4 (6): 516–519. doi:10.1016/S0735-6757(86)80008-0. PMID 3778597.
- Brown DB, Mueller GL, Golich FC (November 1992). "Hyperbaric oxygen treatment for carbon monoxide poisoning in pregnancy: a case report". Aviation, Space, and Environmental Medicine 63 (11): 1011–1014. PMID 1445151.
- Juurlink DN, Buckley NA, Stanbrook MB, Isbister GK, Bennett M, McGuigan MA (January 2005). "Hyperbaric oxygen for carbon monoxide poisoning". In Juurlink, David N. Cochrane Database of Systematic Reviews (1): CD002041. doi:10.1002/14651858.CD002041.pub2. PMID 15674890.
- Henry JA (2005). "Hyperbaric therapy for carbon monoxide poisoning: to treat or not to treat, that is the question". Toxicological Reviews 24 (3): 149–150. doi:10.2165/00139709-200524030-00002. PMID 16390211.
- Olson KR (2005). "Hyperbaric oxygen or normobaric oxygen?". Toxicological Reviews 24 (3): 151. doi:10.2165/00139709-200524030-00003. PMID 16390212.
- Seger D (2005). "The myth". Toxicological Reviews 24 (3): 155–156. doi:10.2165/00139709-200524030-00005. PMID 16390214.
- Thom SR (2005). "Hyperbaric oxygen therapy for carbon monoxide poisoning: Is it time to end the debates?". Toxicological Reviews 24 (3): 157–158. doi:10.2165/00139709-200524030-00006. PMID 16390215.
- Scheinkestel CD, Bailey M, Myles PS, Jones K, Cooper DJ, Millar IL, Tuxen DV (March 1999). "Hyperbaric or normobaric oxygen for acute carbon monoxide poisoning: a randomized controlled clinical trial" (Free full text). The Medical Journal of Australia 170 (5): 203–210. PMID 10092916.
- Thom SR, Taber RL, Mendiguren II, Clark JM, Hardy KR, Fisher AB (April 1995). "Delayed neuropsychologic sequelae after carbon monoxide poisoning: prevention by treatment with hyperbaric oxygen". Annals of Emergency Medicine 25 (4): 474–480. doi:10.1016/S0196-0644(95)70261-X. PMID 7710151.
- Raphael JC, Elkharrat D, Jars-Guincestre MC, Chastang C, Chasles V, Vercken JB, Gajdos P. (August 1989). "Trial of normobaric and hyperbaric oxygen for acute carbon monoxide intoxication". Lancet 2 (8660): 414–419. doi:10.1016/S0140-6736(89)90592-8. PMID 2569600.
- Ducasse JL, Celsis P, Marc-Vergnes JP (March 1995). "Non-comatose patients with acute carbon monoxide poisoning: hyperbaric or normobaric oxygenation?". Undersea & Hyperbaric Medicine 22 (1): 9–15. PMID 7742714.
- Mathieu D, Mathieu-Nolf M, Durak C, Wattel F, Tempe JP, Bouachour G, Sainty JM. (1996). "Randomized prospective study comparing the effect of HBO vs 12 hours NBO in non-comatose CO-poisoned patients: results of the preliminary analysis". Undersea & Hyperbaric Medicine 23: 7.
- Weaver LK, Hopkins RO, Chan KJ, Churchill S, Elliott CG, Clemmer TP, Orme JF Jr, Thomas FO, Morris AH (October 2002). "Hyperbaric oxygen for acute carbon monoxide poisoning". The New England Journal of Medicine 347 (14): 1057–1067. doi:10.1056/NEJMoa013121. PMID 12362006.
- Gorman DF. (June 1999). "Hyperbaric or normobaric oxygen for acute carbon monoxide poisoning: a randomised controlled clinical trial. Unfortunate methodological flaws". The Medical Journal of Australia 170 (11): 563. PMID 10397050.
- Scheinkestel CD, Jones K, Myles PS, Cooper DJ, Millar IL, Tuxen DV (April 2004). "Where to now with carbon monoxide poisoning?". Emergency Medicine Australasia: EMA 16 (2): 151–154. doi:10.1111/j.1742-6723.2004.00567.x. PMID 15239731.
- Isbister GK, McGettigan P, Harris I. (February 2003). "Hyperbaric oxygen for acute carbon monoxide poisoning". The New England Journal of Medicine 348 (6): 557–560. doi:10.1056/NEJM200302063480615. PMID 12572577.
- Buckley NA, Juurlink DN (June 2013). "Carbon monoxide treatment guidelines must acknowledge the limitations of the existing evidence". American Journal of Respiratory and Critical Care Medicine 187 (12): 1390. doi:10.1164/rccm.201212-2262LE. PMID 23767905.
- Tomaszewski C (January 1999). "Carbon monoxide poisoning. Early awareness and intervention can save lives". Postgraduate Medicine 105 (1): 39–40, 43–48, 50. doi:10.3810/pgm.1999.01.496. PMID 9924492.
- Peirce EC (1986). "Treating acidemia in carbon monoxide poisoning may be dangerous". Journal of Hyperbaric Medicine 1 (2): 87–97.
- Devine SA, Kirkley SM, Palumbo CL, White RF (October 2002). "MRI and neuropsychological correlates of carbon monoxide exposure: a case report". Environmental Health Perspectives 110 (10): 1051–1055. doi:10.1289/ehp.021101051. PMC 1241033. PMID 12361932.
- O'Donnell P, Buxton PJ, Pitkin A, Jarvis LJ (April 2000). "The magnetic resonance imaging appearances of the brain in acute carbon monoxide poisoning". Clinical Radiology 55 (4): 273–280. doi:10.1053/crad.1999.0369. PMID 10767186.
- Seger D, Welch L (August 1994). "Carbon monoxide controversies: neuropsychologic testing, mechanism of toxicity, and hyperbaric oxygen". Annals of Emergency Medicine 24 (2): 242–248. doi:10.1016/S0196-0644(94)70136-9. PMID 8037390.
- Chiang, CL; Tseng, MC (27 September 2011). "Safe use of electroconvulsive therapy in a highly suicidal survivor of carbon monoxide poisoning.". Gen Hosp Psychiatry.
- Thom SR (October 2002). "Hyperbaric-oxygen therapy for acute carbon monoxide poisoning". The New England Journal of Medicine 347 (14): 1105–1106. doi:10.1056/NEJMe020103. PMID 12362013.
- Ernst A, Zibrak JD (November 1998). "Carbon monoxide poisoning". The New England Journal of Medicine 339 (22): 1603–8. doi:10.1056/NEJM199811263392206. PMID 9828249.
- Centers for Disease Control and Prevention (CDC) (November 1996). "Deaths from motor-vehicle-related unintentional carbon monoxide poisoning—Colorado, 1996, New Mexico, 1980–1995, and United States, 1979–1992". MMWR. Morbidity and Mortality Weekly Report 45 (47): 1029–32. PMID 8965803.
- Partrick M, Fiesseler F, Shih R, Riggs R, Hung O (2009). "Monthly variations in the diagnosis of carbon monoxide exposures in the emergency department". Undersea & Hyperbaric Medicine: Journal of the Undersea and Hyperbaric Medical Society, Inc 36 (3): 161–7. PMID 19860138.
- Heckerling PS (May 1987). "Occult carbon monoxide poisoning: a cause of winter headache". The American Journal of Emergency Medicine 5 (3): 201–4. doi:10.1016/0735-6757(87)90320-2. PMID 3580051.
- "Department of Public Health Warns of Dangers of Carbon Monoxide Poisoning During Power Outages". Tower Generator. Retrieved 2011-11-23.
- "Avoiding Carbon Monoxide poisoning during a power outage". CDC. Retrieved 2011-11-23.
- Klein, Kelly; Herzog, Perri; Smolinske, Susan; White, Suzanne (2007). "Demand for poison control center services "surged" during the 2003 blackout.". Clinical Toxicology 45 (3): 248–254. doi:10.1080/15563650601031676.
- Hampson NB (September 1998). "Emergency department visits for carbon monoxide poisoning in the Pacific Northwest". The Journal of Emergency Medicine 16 (5): 695–698. doi:10.1016/S0736-4679(98)00080-8. PMID 9752939.
- Cobb N, Etzel RA (August 7, 1991). "Unintentional carbon monoxide-related deaths in the United States, 1979 through 1988". JAMA 266 (5): 659–663. doi:10.1001/jama.266.5.659. PMID 1712865.
- "Carbon Monoxide poisoning fact sheet" (pdf). Centers for Disease Control and Prevention. July 2006. Retrieved 2008-12-16.
- McDowell R, Fowles J, Phillips D (November 2005). "Deaths from poisoning in New Zealand: 2001–2002" (Free full text). The New Zealand Medical Journal 118 (1225): U1725. PMID 16286939.
- Song KJ, Shin SD, Cone DC (September 2009). "Socioeconomic status and severity-based incidence of poisoning: a nationwide cohort study". Clinical toxicology (Philadelphia, Pa.) 47 (8): 818–826. doi:10.1080/15563650903158870. PMID 19640232.
- Salameh S, Amitai Y, Antopolsky M, Rott D, Stalnicowicz R (February 2009). "Carbon monoxide poisoning in Jerusalem: epidemiology and risk factors". Clinical Toxicology (Philadelphia, Pa.) 47 (2): 137–41. doi:10.1080/15563650801986711. PMID 18720104.
- Liu Q, Zhou L, Zheng N, Zhuo L, Liu Y, Liu L (December 2009). "Poisoning deaths in China: type and prevalence detected at the Tongji Forensic Medical Center in Hubei". Forensic Science International 193 (1–3): 88–94. doi:10.1016/j.forsciint.2009.09.013. PMID 19854011.
- Anderson, Scott (July 6, 2008). "The Urge to End It All". New York Times. Retrieved 2009-05-10.
- Wirth I, Strauch H (March–April 2007). "Suicides in East Berlin from 1980 to 1989". Archiv für Kriminologie 219 (3–4): 73–88. PMID 17539588.
- Thomsen AH, Gregersen M (May 21, 2007). "Carbon monoxide deaths caused by town gas in Denmark 1995–99". Ugeskrift for laeger 169 (21): 2020–2024. PMID 17553384.
- Skopek MA, Perkins R (Dec 1998). "Deliberate exposure to motor vehicle exhaust gas: the psychosocial profile of attempted suicide". The Australian and New Zealand Journal of Psychiatry 32 (6): 830–838. doi:10.3109/00048679809073873. PMID 10084348.
- Oström M, Thorson J, Eriksson A (Feb 1996). "Carbon monoxide suicide from car exhausts". Social Science & Medicine 42 (3): 447–451. doi:10.1016/0277-9536(95)00104-2. PMID 8658238.
- Vossberg B, Skolnick J (February 1999). "The role of catalytic converters in automobile carbon monoxide poisoning: a case report" (Free full text). Chest 115 (2): 580–581. doi:10.1378/chest.115.2.580. PMID 10027464.
- Hampson NB (August 1999). "Intentional carbon monoxide poisoning". Chest 116 (2): 586–587. doi:10.1378/chest.116.2.586. PMID 10453903.
- Oehme, C; Penning, R (16 June 2011). "Intentional Carbon monoxide poisoning by burning charcoal". MMW Fortschr Med 153 (24): 48–9. PMID 21717712.
- Yang CC, Ger J, Li CF (April 2008). "Formic acid: a rare but deadly source of carbon monoxide poisoning". Clinical Toxicology 46 (4): 287–9. doi:10.1080/15563650701378746. PMID 18363119.
- Chung WS, Leung CM (June 2001). "Carbon monoxide poisoning as a new method of suicide in Hong Kong" (Free full text). Psychiatric Services (Washington, D.C.) 52 (6): 836–837. doi:10.1176/appi.ps.52.6.836. PMID 11376237.
- Prahlow JA, Doyle BW (June 2005). "A suicide using a homemade carbon monoxide "death machine"." (Free full text). Am J Forensic Med Pathol 26 (2): 80–177. PMID 15894855.
- Naito A (October 2007). "Internet suicide in Japan: implications for child and adolescent mental health". Clinical Child Psychology and Psychiatry 12 (4): 583–597. doi:10.1177/1359104507080990. PMID 18095539.
- Leung CM, Chung WS, So EP (May 2002). "Burning charcoal: an indigenous method of committing suicide in Hong Kong". The Journal of Clinical Psychiatry 63 (5): 447–450. doi:10.4088/JCP.v63n0512. PMID 12019670.
- Lee DT, Chan KP, Yip PS (March 2005). "Charcoal burning is also popular for suicide pacts made on the internet". BMJ 330 (7491): 602. doi:10.1136/bmj.330.7491.602-b. PMC 554074. PMID 15761009.
- Pan YJ, Liao SC, Lee MB (April 2009). "Suicide by charcoal burning in Taiwan, 1995–2006". Journal of Affective Disorders 120 (1–3): 254–7. doi:10.1016/j.jad.2009.04.003. PMID 19410296.
- Brooks-Lim EW, Sadler DW (October 2009). "Suicide by burning barbecue charcoal: three case reports". Medicine, Science, and the Law 49 (4): 301–6. doi:10.1258/rsmmsl.49.4.301. PMID 20025107.
- Patel F (August 2008). "Carbon copy deaths: carbon monoxide gas chamber". Journal of Forensic and Legal Medicine 15 (6): 398–401. doi:10.1016/j.jflm.2008.01.004. PMID 18586213.
- Hunt IM, While D, Windfuhr K, Swinson N, Shaw J, Appleby L, Kapur N (May 2009). "Suicide pacts in the mentally ill: a national clinical survey". Psychiatry Research 167 (1–2): 131–8. doi:10.1016/j.psychres.2008.05.004. PMID 19342106.
- "Police Report On Delp's Death Reveals His Final Message". WMUR. 2007-03-14. Retrieved 2007-04-30.
- Pilot study of risks and long-term effects of carbon monoxide poisoning by Brian Miller, John Ross, Laura MacCalman, Chris Burton and Claudia Pagliari. Institute of Occupational Medicine Research Report TM/11/02
- Centers for Disease Control and Prevention (CDC) – Carbon Monoxide – NIOSH Workplace Safety and Health Topic