The work of the heart is decreased and {HEAD ~ coronary blood flow} is increased to promote the formation of new coronary collateral channels and {TAIL ~ the perfusion} of the heart itself 
is increased to promote
The work of the heart is decreased and { HEAD ~ coronary blood flow } is increased to promote the formation of new coronary collateral channels and { TAIL ~ the perfusion } of the heart itself
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH