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Figure 1 Representative recordings of coronary flow velocity signal in a patient with single-vessel disease undergoing percutaneous transluminal coronary angioplasty. The tracings are shown in the panels from top to bottom: electrocardiogram, aortic pressure, instantaneous flow velocity and flow velocity trend. Pharmacologic coronary flow velocity reserve (CFVR) (left): flow velocity at rest = 9.1 cm/s, maximal flow velocity after administration of 18 µg adenosine = 28 cm/s; CFVR: 28/9.1 = 3.1. Determination of postischemic CFVR (right): flow velocity after 1-min balloon occlusion = 28 cm/s; CFVR: 28/9.1 = 3.1. Pharmacologic CFVR after metoprolol (lower panels): flow velocity at rest = 9.7 cm/s, maximal flow velocity after adenosine = 36 cm/s; CFVR: 36/9.7 = 3.7. Postischemic CFVR: postischemic flow velocity = 41 cm/s; CFVR: 41/9.7 = 4.2.
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