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