But so far as its heart is concerned, he has no more than grasped its right ventricle.

ECONOMIST: Heads, not hearts

As a result, the right ventricle is usually very small and underdeveloped (hypoplastic).

CNN: Tricuspid atresia

This extra lead runs from the more easily accessible right ventricle of the heart, out of the heart and into the external vasculature of left ventricle, shocking it from outside the heart.

ECONOMIST: Case history