What is the heart defect called Single Ventricle ?
While the normal heart has two ventricles, in some birth defects, one of these ventricles may be absent or poorly developed. This condition is called Single Ventricle or Univentricular heart.
The ventricular structure may resemble the normal left ventricle or the normal right ventricle. Sometimes, it resembles neither, and this is called Indeterminate ventricle morphology.
In a single ventricle heart, there are two normal atria – right and left. These open into the ventricle through an atrio-ventricular (AV) valve. There might be
two AV valves, both opening into the ventricle – a condition called Double Inlet Ventricle – or one AV valve only, with the other one being absent (Atresia)