Hypoplastic Left Ventricle: Definition, Morphology, and Classification of the Cardiac Phenotypes.

A prior manuscript provided information about hypoplastic left heart syndrome (HLHS) and related malformations, including definitions, morphology, and classification, based on the 2021 (IPCCC) and the (ICD-11). This manuscript provides information about the related cardiac phenotypes associated with "hypoplastic left " that might be suitable for biventricular repair, including definitions, morphology, and classification of the cardiac phenotypes of the following four congenital cardiac malformations that can all include a hypoplastic left ventricle: (1) hypoplastic left heart complex (HLHC), (2) critical aortic stenosis with left ventricular hypoplasia, (3) aortic atresia + ventricular septal defect, and (4) hypoplastic left ventricle with severely unbalanced atrioventricular septal defect.