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