Despite the progress in the era of reperfusion, cardiac rupture is still a prominent cause of early death after acute myocardial infarction (AMI). Mostly, electromechanical dissociation with sudden collapse is the scenario. Echocardiography is vital for prompt diagnosis, excluding other mechanical complications, and guiding emergent therapeutic pericariocentesis prior to repair surgery. We present a 73-year-old male, who suffered from his first-time ST-segment elevation AMI, developing cardiac rupture with the presentation of sudden circulatory collapse, electromechanical dissociation, sinus bradycardia, and massive bloody pericardial effusion. He was encountered in the emergency department, and a hand-carried echocardiography device provided timely aid to the diagnosis, management and successful rescue of this patient.