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Figure 2 (A) Simultaneous tracing of three surface and one intracoronary (i.c.) ECG lead (at the top), of phasic (left side), mean aortic (Pao, 89 mm Hg during occlusion) and IC distal pressure before, during (Poccl, 11 mm Hg) and after occlusion. CVP = central venous pressure (7 mm Hg). During occlusion of the stenosis, there are marked ST-segment elevations (arrows) on the i.c. ECG lead that disappear after balloon deflation. On the simultaneous flow velocity tracing, flow velocity time integral (Vioccl) during occlusion amounts to 2.3 cm. Vi after PTCA was equal to 33 cm (Viø-occl, not shown), thus CFIv = 2.3/33 = 0.07; CFIp = (11-7)/(89-7) = 0.05. (B) Simultaneous tracings as described above. Pao = 90 mm Hg during occlusion, Poccl = 34 mm Hg, CVP assumed to be 5 mm Hg. During occlusion of the stenosis, there are no ST-segment elevations on the IC or surface ECG leads. On the simultaneous flow velocity tracing, Vioccl amounts to 5.3 cm. Vi after PTCA was equal to 15 cm (Viø-occl, not shown), thus CFIv = 5.3/15 = 0.35; CFIp = (34-5)/(90-5) = 0.34.
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