today the three major coronary sinus techniques , i.e. , sychronized retroperfusion ( srp ) , retroinfusion of cardioplegia during cardiac arrest and retroinfusion of pharmaceutical agents in the normal working heart , and pressure-controlled intermittent coronary sinus occlusion ( picso ) have been documented as providing superior protection of jeopardized myocardium in selected subsets of patients .
C0018787
heart
C0027061
myocardium