The lead 162 carries {HEAD ~ pacing and sensing electrodes} 172, 174, for sensing {TAIL ~ ventricular depolarizations} and for pacing the heart 
The lead 162 carries { HEAD ~ pacing and sensing electrodes } 172 , 174 , for sensing { TAIL ~ ventricular depolarizations } and for pacing the heart
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH