The sensor is mounted on {HEAD ~ a transvenous lead} extending from {TAIL ~ an implanted stimulator} or monitoring device 
The sensor is mounted on { HEAD ~ a transvenous lead } extending from { TAIL ~ an implanted stimulator } or monitoring device
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH