透壁性心肌梗塞并发症之一是心脏破裂，极有可能在初次发作后的第三至第五天发生，因此时心肌最柔软。在左心室前壁和室间隔前部，白色箭头所指的即为破裂点。注意暗红血凝块为心包积血，可致心包填塞。
One complication of a transmural myocardial infarction is rupture of the myocardium. This is most likely to occur in the first week between 3 to 5 days following the initial event, when the myocardium is the softest. The white arrow marks the point of rupture in this anterior-inferior myocardial infarction of the left ventricular free wall and septum. Note the dark red blood clot forming the hemopericardium. The hemopericardium can lead to tamponade.