An example of a concussive force strike used in medicine is the pericordial thump.
Definition of Pericordial Thump (aka Thumpversion)
thumpversion /thump·ver·sion/ (thump-ver´zhun) delivery of one or two blows to the chest in initiating cardiopulmonary resuscitation, in order to initiate a pulse or to convert ventricular fibrillation to a normal rhythm.
Cardiac Concussion (commotio cortis)
Cardiac concussion (commotio cordis) is seen in patients in whom the precordium has been struck with relatively little force at a vulnerable period of the cardiac cycle. These patients have no predisposing cardiac problems, and autopsy reveals no evidence of heart damage. The usual clinical presentation is that of immediate collapse secondary to a lethal arrhythmia.
http://www.cjem-online.ca/v6/n6/p428
Yet another example of a blunt force/concussive strike that can have an effect on heart rhythm (ventricular fibrillation).