to determine maturational differences in myocardial pressure work , oxygen consumption , and stability , we evaluated an isolated retrogradely perfused isovolumic rabbit heart model in newborns ( 0-6 days of age , mean 3.3 +/- 1.9 days ) , immatures ( 4-6 wk ) and adults ( 5-7 mo ) .
C0027061
myocardial
C0018787
heart