The
apex beat (lat. ictus cordis), also called the
point of maximum impulse (
PMI), is the furthermost point outwards (laterally) and downwards (inferiorly) from the
sternum at which the
cardiac impulse can be felt. The cardiac impulse is the result of the
heart rotating, moving forward and striking against the chest wall during
systole. It is not the apex of the heart but the point where the apex beat is felt.