Which of the following is not a feature of cardiac tamponade?

a. Identification of cardiac tamponade relies upon ‘Beck’s triad’: hypotension, jugular vein distention and muffled heart sounds. This results from fluid accumulation in the pericardial sac that dampens the transmission of sounds through the chest wall. Identification of the quiet heart sounds can be difficult just using a stethoscope, which is why a hospital setting is useful for further investigations. Bradycardia is not associated with cardiac tamponade, in fact, tachycardia is often seen as there is reduced filling time in the cardiac cycle due to reduced capacity of the chambers.