[Severe obstructions to outflow (and inflow) of the left ventricle in the newborn. Anatomo-clinical forms].

Hypoplastic left heart syndrome, fundamentally aortic atresia with mitral hypoplasia or atresia, and related anomalies (critical aortic stenosis, mitral atresia and mitral stenosis) are the most important causes of severe left ventricular outflow and inflow tract obstruction in the newborn. We describe the anatomo-clinic forms of this entities and enumerate another less common causes of left ventricle obstruction in the neonate: mitral subvalvular abnormalities, cardiomyopathies and cardiac tumors.