Abstract
It is usual for the electro-cardiographic prediction of the position of gross infarction to be confirmed at a subsequent examination of the heart at necropsy. Such localization is made in regard to some 5 sectors of the left ventricle, namely anterior, lateral, postero-lateral, postero-medial, and septal; the recognition of an extension of either the anterior or postero-medial infarction into the right ventricle, as may happen, is not yet feasible.