Ans. is 'b' i.e. Immediate emergency room thoracotomy should be done There is no need for emergency thoracotomy in a hemodynamically stable ptCardiac tamponade is quite common in stab injuries to the chest.* The classical sign of tamponade are-:Muffled heart sounds*Distended neck veins* -- k/a Beck Triad*Hypotension*The tamponade can be easily diagnosed by echocardiography (identifying abnormal amount of pericardial fluid) and is managed by pericardiocentesis or surgical pericardiotomy