Tachypnea
| ICD-10 | R06.0 |
|---|---|
| ICD-9 | 786.06 |
Tachypnea (or "tachypnoea") (Greek: "rapid breathing") means rapid breathing. Any rate between 12-20 breaths per minute is normal. Tachypnea is a respiration rate greater than 20 breaths per minute. [1]
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[edit] Distinction from other breathing terms
Different sources produce different classifications for breathing terms.
Some describe tachypnea as any rapid breathing. Hyperventilation is then described as increased ventilation of the alveoli (which can occur through increased rate or depth of breathing, or both) where there is a smaller rise in metabolic carbon dioxide relative to this increase in ventilation. Hyperpnea, on the other hand, is defined as breathing more rapid and deep than breathing at rest.[2]
Others give another classification: tachypnea is as any rapid breathing, hyperventilation is increased rate of breathing at rest, hyperpnea is an increase in breathing that is appropriately proportional to an increase in metabolic rate.[3]
A third paradigm is: tachypnea is abnormally rapid respiration (though some may argue this is inaccurate as breathing differs from respiration), hyperventilation is increased rate or depth of respiration to abnormal levels causing decreased levels of blood carbon dioxide and hyperpnea is any increase in breathing rate or depth that is not normal.[4]
[edit] Causes
Tachypnea may have physiological or pathological causes. Both of these categories would include large lists of individual causes. For example, physiological causes of tachypnea include exercise and labour during pregnancy. Amongst pathophysiological causes, tachypnea can be a symptom of carbon monoxide poisoning in which oxygen delivery to the tissues and organs is blocked causing hypoxia and direct cellular injury. It can also be a symptom of haemothorax or pneumothorax.
[edit] See also
- Hypoventilation, too shallow or too slow breathing
- List of terms of lung size and activity
- Control of respiration
[edit] References
- ^ "tachypnea" at Dorland's Medical Dictionary
- ^ Stedman's medical dictionary 28th ed. (2006)
- ^ Martin, Elizabeth A (ed.) (2003). Oxford concise medical dictionary (6th ed. w. corrections & new cover) Oxford University Press. pp. 333-4. ISBN 10:0-19-860753-9
- ^ Dorland's Medical Dictionary for Health Consumers. © 2007 by Saunders, an imprint of Elsevier, Inc.
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