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