Abstract
Regional myocardial function was measured with miniature ultrasonic crystals before, during, and after 10 min of coronary occlusion in anaesthetised open-chest dogs. In normal myocardium, intracoronary isoprenaline (0.1 micrograms . min-1) increased contraction velocity during the first third of systole (early systolic velocity) from 13.8 +/- 2.5 to 19.4 +/- 3.9 mm . s-1 . cm-1, (P < 0.01), and blood flow (microspheres) from 0.55 +/- 0.04 to 0.80 +/- 0.12 cm3 . min-1 . g-1 (P < 0.05); lactate extraction was unchanged. Coronary occlusion induced dyskinesia with a fall in early systolic velocity to -10.0 +/- 2.4 mm . s . -1 . cm-1 (P < 0.01). Abrupt reperfusion after 10 min of ischaemia permitted recovery towards normal, but regional function then deteriorated over 15 min. After a second infusion of isoprenaline, early systolic velocity increased from 0.8 +/- 2.2 to 14.2 +/- 2.5 mm . s-1 . cm-1 (P < 0.01), blood flow 0.44 +/- 0.03 to 0.73 +/- 0.14 cm3 . min-1 . g-1 (P < 0.01) and oxygen consumption 50 +/- 5 to 58 +/- 5 mm3 . min-1 . g-1 (P < 0.05). Lactate extraction was unchanged. In a further series of experiments, administration of nitroglycerin and methoxamine accelerated recovery from dyskinesia induced by coronary occlusion...Continue Reading
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