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Accurately depicts the process of cardiac tamponade (hemorrhage within the pericardium) with subsequent ventricular collapse. Shows normal heart and the pericardial sac (pericardium). Progression of tamponade: 1. Normal heart, ventricles, pericardial space and pericardial sac; 2. Initial condition with blood hemorrhaging between the heart wall and the pericardial sac; 3. Ultimate condition with the collapse of the ventricles and the blood stopping the heart from beating