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Figure 1 Effect of hypertension (HTA) on aortic valve by echocardiographic assessment. Transthoracic echocardiography was used to measure the following morphologic and functional parameters at baseline and at two and four months of follow-up: valve thickness (A), aortic valve area (AVA) x continuity (B), maximal gradient (C), and mean gradient (D) in hypertensive (left) and control rabbits (right).