Collateral Blood Flow through the Ischemic Myocardium in the Dogs

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Using anesthetized dogs, the flow through the left ventricular wall has been continuously monitored by heated cross-thermocouples.On occluding the anterior descending branch of the left coronary artery, an abrupt reduction in the flow through both the outer half and the inner half of the anterior wall occurred. In about 46sec., however, a gradual recovery of the flow was observed in these halves. This increased inflow into the ischemic outer half was eliminated, whereas the increased inflow into the ischemic inner half was little influenced, by ligation of the left circumflex branch and the right coronary artery.It is considered that an immediate development of the intercoronary collateral circulation played a role in the recovery of the blood flow through the outer half, during which the blood inflow through the direct communications between the coronary arteries and the ventricular chamber contributed to the recovery of the flow through the inner half of the occluded zones.
International Heart Journal刊行会の論文