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Aortic valve pressure gradients (ΔP) calculated by Doppler echocardiography (E) can exceed those recorded by cardiac catheterization (C). One possible cause for this difference is the effect of pressure recovery (PR). To quantify the magnitude of PR, ΔP was simultaneously measured across the aortic valve by both E and C in 13 patients with aortic valve disease (valve area: 0.99 +/- 0.65 cm2; mean...