Necrosis, Myomalacia Cordis, of the heart muscle is usually due to obstruction of the coronary artery by arteriosclerosis, thrombosis, or embolism with the formation of an infarct. The wall at the apex of the left ventricle is the common site. This area breaks down, and empties into the ventricle or into the pericardial sac. May rupture or may dilate and form a cardiac aneurysm.

By endocarditis is indicated an inflammatory condition of the serous membrane lining the heart. Is most common upon the valves (valvular), although the endocardium of the cavities (mural) may be involved. It may be divided into the acute and the chronic, the acute being subdivided into the verrucous and the ulcerative.