In a<unk> , a provider strikes at the middle of a person's sternum with the ulnar aspect of the fist. The intent is to interrupt a potentially life-threatening rhythm. The<unk>  is thought to produce an electrical depolarization of 2 to 5 joules.
Precordial thump
Intrinsicoid deflection
Apex beat
Right axis deviation
Pulsus alternans
Hyperdynamic precordium
Collapsing pulse
Ridged band