Niedomykalność zastawki aortalnej (łac. insufficientia valvulae aortae, ang. aortic insufficiency, aortic regurgitation) – wada serca polegająca na nieprawidłowym zamykaniu się płatków zastawki aortalnej

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Aortic regurgitation (AR), also known as aortic insufficiency, is a form of valvular heart disease in which the integrity of the aortic valve is compromised and leads to inadequate closure of the valve leaflets