A selected branch of the coronary sinus is accessed with the distal tip and {HEAD ~ the distal tip} of the lead is seated in {TAIL ~ the selected branch} of the coronary sinus 
A selected branch of the coronary sinus is accessed with the distal tip and { HEAD ~ the distal tip } of the lead is seated in { TAIL ~ the selected branch } of the coronary sinus
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH