hamster hearts from 250-day-old animals with moderate heart failure were removed and perfused either as nonworking hearts ( langendorff method , an afterload pressure of 90 mm hg and 2.5 mm calcium in the perfusate ) or as working hearts with stress conditions [ an afterload of 110 mm hg , high calcium concentrations in the perfusate ( 3.5 mm ) , and 10 ( -8 ) m isoproterenol ] .
C0018801
heart failure
C0018787
hearts