SUMMARYThe degree and effectiveness of compensatory changes in the distal coronary vascular bed during progressive proximal coronary stenosis have not been described. In this study, coronary vascular bed resistance and pressure gradient-flow relationships were determined for 157 Neither the flow transducer nor circumflex catheters affected maximum coronary flows or induced significant pressure gradients. This observation was repeatedly confirmed by recording maximal flows before and after insertion of the circumflex catheters and by recording circumflex coronary pressure during hyperemia before and after removal 1085
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