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