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Figure 4 Coronary angiography, electrocardiogram (D3, V4), aortic and distal coronary pressure and coronary blood flow velocity (CBFV) in patients with stenosis and transient occlusion of the left anterior descending coronary artery. Adenosine increased transstenotic pressure gradient and blood flow. During ischemia and ST segment elevation in V4, distal coronary pressure was similar to that observed following adenosine. During balloon occlusion (PTCA) distal pressure was markedly lower, while blood flow velocity was not monitored.
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