Double inlet left ventricle

Cyanotic neonate

A double inlet left ventricle (DILV) or "single ventricle", is a congenital heart defect appearing in 5 in 100,000 newborns, where both the left atrium and the right atrium feed into the left ventricle. The right ventricle is hypoplastic or does not exist.

Effects

Both atria communicate with the ventricle by a single atrio-ventricular valve. There is a big shunt left-right with a quickly evolutive pulmonary hypertension. Without life-prolonging interventions, the condition is fatal, but with intervention, the newborn may survive. Even if there is no foetal sickness, the diagnosis can be made in utero by foetal echocardiography.

Infants born with DILV cannot feed normally (breathlessness) and have difficulty gaining weight. The mixed blood in systemic circulation leads to hypoxia (lack of oxygen to the body and organs), so infants develop cyanosis and breathlessness early. Mortality is very high in the first 2 years, 85%, but after it decreases and between 2 and 15 years old the mortality is only around 9%. Few reach middle age.^[1] Diagnosis must be made within few days or even hours to prevent death.

Treatment

In the first few days, if there is no pulmonary valve stenosis, a pulmonary valve banding is necessary to prevent pulmonary hypertension and the ductus must be kept open to allow blood-flow using medication containing prostaglandin. At same time, if necessary, the atrial and ventricular septum communications must be enlarged.
When possible Glenn procedure is done.^[2]
Later, surgical options include the Damus–Kaye–Stansel procedure, the Fontan procedure, and the Norwood procedure. The goal of all of these is separating the pulmonary and the systemic circulation.^[3]

Usually, DILV is associated with other cardiac malformations.

References

↑ Éléments de prognostic du Ventricule Unique, M.Lurdes Cerol Leonardo, S. Godeau, S. Magnier, A. Casassoprana, P. Vernant 19th. Annual meeting of European Paediatric Cardiologists, Amsterdam, May 1982
↑ Glenn WWL. Circulatory by pass of the right side of the heart. Shunt between superior vena cava and distal right pulmonary artery report of a clinical application. N Engl J Med 259: 117, 1958
↑ Fontan F, Baudet E (1971). "Surgical repair of tricuspid atresia". Thorax 26 (3): 240–8. doi:10.1136/thx.26.3.240. PMC 1019078. PMID 5089489.

External links

Double inlet left ventricle information for parents.

Congenital heart defects (Q20–Q24, 745–746)

Cardiac shunt/
heart septal defect

Aortopulmonary septal defect	R→L: Double outlet right ventricle Taussig–Bing syndrome Transposition of the great vessels dextro levo Persistent truncus arteriosus Aortopulmonary window

Atrial septal defect	L→R: Sinus venosus atrial septal defect Lutembacher's syndrome

Ventricular septal defect	L→R and R→L: Eisenmenger's syndrome R→L, with other conditions: Tetralogy of Fallot

Atrioventricular septal defect	L→R: Ostium primum

Valvular heart disease/
heart chambers

Right	pulmonary valves stenosis insufficiency tricuspid valves stenosis atresia Ebstein's anomaly Hypoplastic right heart syndrome Uhl anomaly

Left	aortic valves stenosis insufficiency bicuspid mitral valves stenosis regurgitation Hypoplastic left heart syndrome

Other

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