to test the hypothesis that myocardium within an infarction zone is more susceptible to volume-induced changes in refractoriness than is normal myocardium , we measured strength-interval curves at low and high end-diastolic volumes at control and infarcted sites in 14 isolated , blood perfused , canine hearts with chronic ( greater than 25 days ) infarctions .
C0027051
myocardium
C0021308
infarctions