1. If it ruptures on the free wall, it will cause cardiac tamponade . 2. But many patients display diastolic collapse and do not suffer cardiac tamponade . 3. Pulmonary embolism and cardiac tamponade are considered forms of obstructive shock. 4. Here it can cause right-sided heart failure, arrhythmias, pericardial effusion, and cardiac tamponade . 5. Patients with cardiac tamponade and hemodynamic compromise should have emergency pericardiocentesis. 6. This state of affairs, called cardiac tamponade , sometimes kills the patient within minutes. 7. The medical signs classically associated with acute cardiac tamponade are collectively called Beck's triad. 8. A large cardiac tamponade will show as an enlarged globular-shaped heart on chest x-ray. 9. A pericardial effusion with enough pressure to adversely affect heart function is called cardiac tamponade . 10. Beck is also credited with describing the physiological basis for the signs of acute cardiac tamponade .