A<unk>  is a medical procedure used in the initial response to a witnessed cardiac arrest when no defibrillator is immediately available.  It can be used as a small part of the provision of advanced cardiac life support (ACLS). About 25% of patients in cardiac arrest who received a<unk>  on the precordium regain cardiac function (Scherf and Bornemann:, 1960)
Precordial thump
Epsilon wave
Sine wave pattern
Pulsus alternans
Unequal pulses
Rebound tenderness
Collapsing pulse
Irregular pulse