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Figure 2 Examples of frame by frame planimetry in three patients with valve area <1 cm2 (A), 1 to 2 cm2 (B) and more than 2 cm2 (C). In each diagragm aortic valve area (AVA) in square centimeters is plotted against time which is expressed in number of video frames (each equal to 33 ms) for one ejection period.
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