at the ages of 3 and 7 months , each group of animals was used for one of three experimental protocols : determination of numerical capillary density in perfusion-fixed hearts , measurement of coronary reactive hyperemic responses following a 20-second coronary occlusion ( peak-to-resting blood flow velocity ) as an index of coronary reserve , and assessment of myocardial perfusion under resting conditions and during maximum coronary dilation ( dipyridamole infusion ) for the calculation of minimum coronary resistance per unit weight of the left ventricle or minimum coronary resistance of the total left ventricle .
C0018787
hearts
C0018827
ventricle