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Figure 1 From top to bottom: electrocardiogram, proximal coronary pressure (prox p), distal coronary pressure (dist p) and coronary flow velocity at maximal hyperemia (left), intermediate hyperemia (middle) and baseline condition (right) in a patient with an intermediate coronary stenosis. During hyperemia, higher flow velocities and higher pressure gradients are observed compared with baseline condition and intermediate hyperemia. The arrows delineate the middiastolic data, used to construct the flow velocity-pressure gradient relation.
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