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