Hypoplastic left heart syndrome
|Hypoplastic left heart syndrome|
Illustration of heart suffering from Hypoplastic left heart syndrome
|Classification and external resources|
Signs and symptoms
In typical anatomy, the left side of the heart receives oxygen-rich blood from the lungs and pumps it to the rest of the body. In patients with HLHS, the aorta and left ventricle are underdeveloped (beginning in utero), and the aortic and mitral valves are either too small to allow sufficient blood flow or are atretic (closed) altogether. As blood returns from the lungs to the left atrium, it must pass through an atrial septal defect to the right side of the heart so it can be pumped to the rest of the body. This blood must flow through a patent (open) ductus arteriosus. Since the ductus arteriosus usually closes within eleven days after birth, blood flow may be severely restricted and eventually blocked, leading to dangerously low circulation and, eventually, shock.
The majority of congenital heart defects have no known cause. If part of the endocardial tube gets pinched shut in a region that becomes the future ventricle, hypoplastic heart syndrome will occur. If the pinched part of the endocardial tube is the bulbus-cordis region of the developing heart, hypoplastic RIGHT syndrome will occur. If it is in the ventricle region it will be the LEFT side that is hypoplastic.
Colleagues at Cincinnati Children’s Hospital in Ohio studied 1,500 newborns from 38 children’s hospitals in the United States from the 1990s to 2006. They found that babies born between April and July were more likely to have this defect, establishing strong evidence that seasonality and  environmental factors play a significant role in causation.
HLHS usually occurs as an isolated cardiac defect. Genetic loci associated with HLHS include GJA1 (connexin 43), HAND1, NKX2.5, 10q, and 6q. In addition to these specific genetic associations, other predisposing mutations are thought to play a role in pathogenesis of HLHS because the recurrence risk in first degree relatives of infants with HLHS is 2-4%. However, the majority of cases are thought to be non-inherited because of the severity with which HLHS impairs reproductive fitness. HLHS has been seen in the following genetic syndromes: Trisomy 13 (Patau syndrome), Trisomy 18 (Edwards syndrome), Partial Trisomy 9, Turner's syndrome, Jacobsen syndrome, Holt-Oram Syndrome, and Smith-Lemli-Opitz Syndrome.
Before surgery, the ductus must be kept open to allow blood-flow using medication containing prostaglandin. Air with less oxygen than normal is used for infants with hypoplastic left heart syndrome. These low oxygen levels increases the pulmonary vascular resistance (PVR) and thus improve blood flow to the rest of the body, due to the greater pressure difference between the lungs and body. Achieving oxygen levels below atmosphere requires the use of inhaled nitrogen. Nitric oxide is a potent pulmonary vasodilator, thus reduces PVR, improves venous return. Any factor that increases PVR will impede right sided flow.
Surgical operations to assist with hypo-plastic left heart are complex and need to be individualized for each patient. A cardiologist must assess all medical and surgical options on a case-by-case basis.
Currently, infants undergo either the staged reconstructive surgery (Norwood or Sano procedure within a few days of birth, Glenn or Hemi-Fontan procedure at 3 to 6 months of age, and the Fontan procedure at 1 1/2 to 5 years of age) or cardiac transplantation. Current expectations are that 70% of those with HLHS will reach adulthood. Many studies show that the higher the volume (number of surgeries performed) at a hospital, the lower the mortality (death) rate. Therefore, the main determinant of success is the choice of hospital. Other factors that increase an infant's risk include lower birth weight, additional congenital anomalies, a genetic syndrome or those with a highly restrictive atrial septum.) For patients without these additional risk factors, 5 year survival now approaches 80%. Further, studies show that about 50% of those children who survived surgery in the early development of staged reconstruction have developmental delay or need special education; about 25% of these surgical survivors have severe disabilities. There is growing evidence that while the incidence of developmental and behavioral disabilities continues to be higher than that in the general population, children operated upon in the more current era have shown significantly better neurological outcomes. An alternative to the traditional Norwood is the Hybrid procedure.
Some physicians offer "compassionate care", instead of the surgeries, which results in the child's death, usually within 2 weeks of birth. Compassionate care is overseen by a physician, and may be carried out either in the hospital or at home. However, due to the vast improvement of surgical intervention, with many hospitals achieving over 90% survival, there is debate on whether or not "compassionate care" should still be offered to families. A study in 2003 concluded that a selection of physicians who are experts in the care of children with HLHS were evenly split when asked what they would do if their own children were born with HLHS, with 1/3 stating that they would choose surgery, 1/3 stating that they would choose palliative (compassionate) treatment without surgery, and 1/3 stating that they are uncertain which choice they would make.
The three-stage procedure is a palliative procedure (not a cure), as the child's circulation is made to work with only two of the heart's four chambers.
The first step is the Norwood procedure. In this procedure, the right ventricle is used to pump blood into the systemic circulation. Since the right ventricle is no longer directly pumping blood to the lungs, a shunt is required in order to pass deoxygenated blood through the lungs. Either the subclavian artery can be connected to the pulmonary circulation (Blalock-Taussig shunt), or a shunt is made directly from the right ventricle to the pulmonary circulation (Sano shunt). The narrow aorta is enlarged using a patch to improve blood flow to the body.
During this time the baby may be medically fragile and have feeding problems because the heart is working very hard. There is a considerable degree of venous mixing in the right ventricle, leading to lower oxygenation saturation. In addition, both the Blalock-Taussig and the Sano shunts expose the lungs to systemic arterial pressures, leading to long-term pulmonary hypertension and eventually heart failure.
The Hybrid procedure may be used in place of the Norwood. The Hybrid procedure does not necessitate the use of heart-lung bypass or performing a sternotomy. Instead of a six-hour surgery, the Hybrid typically takes one to two hours. In this procedure, a stent is placed in the ductus arteriosus to maintain its patency, and bands are placed over both the left and right pulmonary artery branches to limit pressure and over-circulation to the lungs. Outcomes with the Hybrid approach are comparable to those with the Norwood.
The second stage — the bidirectional Glenn or Hemi-Fontan (see also Kawashima procedure) — relieves some of the problems introduced by Stage I palliation. In this operation, the superior vena cava is ligated from the heart and connected to the pulmonary circulation. At this time, the Blalock-Taussig or Sano shunt is taken down. The lungs are no longer exposed to systemic arterial pressures, but much lower venous pressures. Although venous blood from the upper half of the body is no longer mixing with oxygenated blood in the right ventricle, there is still venous mixing from the lower half of the body, leading to some degree of oxygen desaturation.
The final procedure, the Fontan procedure, completes the repair of the hypoplastic left heart. Although there are several variations, the functional effect is to redirect venous blood from the lower body (through the inferior vena cava) away from the right atrium to the pulmonary artery. This should eliminate any mixing of oxygenated and deoxygenated blood in the right ventricle. The right ventricle performs the traditional job of the left, supplying the body with oxygenated blood, while the passive systemic venous pressure performs the traditional job of the right, passing deoxygenated blood to the lungs.
Early survival has improved since the introduction of the Norwood procedure. Since there are no long-term studies of HLHS adults, statistics are usually derived from post-Fontan patients; it is estimated that 70% of HLHS patients will reach adulthood.
As is true for patients with other types of heart defects involving malformed valves, HLHS patients run a high risk of endocarditis, and must be monitored by a cardiologist for the rest of their lives to check on their heart function.
Heart transplantation may be indicated, typically after Fontan completion. One multi-center study (of patients undergoing the Fontan from 1993-2001) reported a 76% 1-year survival rate in patients who survived to transplant.
The National Birth Defects Prevention Network estimates that birth defects occur in about three percent of live births in the United States. Of those birth defects, HLHS occurs in one out of 4,344 live births, or an estimated total of 960 live births every year in the United States. HLHS occurs at a sixth of the rate of the most common birth defect, Trisomy 21 (Down syndrome).
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- Hypoplastic Left Heart Syndrome | Congenital Heart Disease - Cove Point Foundation | Johns Hopkins Children's Hospital
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- CDC Data & Statistics | Feature: Updated Estimates for Selected Birth Defects
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|Wikimedia Commons has media related to Hypoplastic left heart syndrome.|
- Hypoplastic Left Heart Syndrome - Stanford Children's Health
- Hypoplastic Left Heart Syndrome Program from Mayo Clinic HLHS Cause to Cure
- HLHS Information Page Questions to ask medical professionals and insurance company, plus resources
- Hypoplastic Left Heart Syndrome information from Seattle Children's Hospital Heart Center
- Card-AG, The Cardiologycal Working Group of the University Pediatric Clinic Munster
- Hypoplastic Left Heart Syndrome, American Heart Association
- Overview at Cincinnati Children's Hospital Medical Center
- Overview at University of Michigan Congenital Heart Center
- Cardiac Center at The Children's Hospital of Philadelphia
- Hypoplastic left heart syndrome information for parents.
- Little Hearts Matter, a charity providing support and information on HLHS and other single ventricle heart defects
- Baby Hearts Press
- 120+ stories of children born with Hypoplastic Left Heart Syndrome hosted by the The Congenital Heart Information Network.
- HLHS email support groups/discussion list hosted by the The Congenital Heart Information Network (membership required).
- Little Hearts, Inc. — Providing hope with stories of children with HLHS and other CHDs. Email support group (membership required)
- HeartLine, a charity for children with heart conditions and their families
- Designer Heart, A Congenital Heart Defect Network.
- It's My Heart, a non-profit organization created to provide support to and advocating for those affected by Acquired and Congenital Heart Defects.