{TAIL ~ Battery supply ground} is in common with one of the defibrillator leads, and conventional pacers provide pacer pulses with respect to {HEAD ~ battery ground} 
{ TAIL ~ Battery supply ground } is in common with one of the defibrillator leads , and conventional pacers provide pacer pulses with respect to { HEAD ~ battery ground }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD