{HEAD ~ Also, stimulation} at a physiological back up frequency is provided in {TAIL ~ the event} of a detected ventricular pause 
is provided in
{ HEAD ~ Also , stimulation } at a physiological back up frequency is provided in { TAIL ~ the event } of a detected ventricular pause
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH