cardiac impulse meaning

• [Medicine]
  n : the wave of cardiac excitation passing from the sinoatrial node to the atrioventricular node and along the bundle of His and initiating the cardiac cycle; broadly : HEARTBEAT
  

• impulse:    Noun: impulse  ...
• on impulse:    [American slang]af ...
• cardiac:    Adjective: cardiac ...

Examples

1. The most common cause of sustained rhythm disturbances is a condition called atrial fibrillation, in which the electrical cardiac impulse in the upper chamber of the heart become unstable, resulting in irregular and quivering contractions.