Spencer RJ, et al. – This research was sought to develop the accuracy and appropriate normal limits of routinely collected transthoracic Doppler parameters when applied to evaluate bioprosthetic mitral valve function. The data illustrated that Doppler parameters derived from transthoracic echocardiography can accurately detect bioprosthetic mitral valve dysfunction. These parameters, especially a mitral inflow velocity–time integral (VTIMV)/left ventricular outflow tract velocity–time integral (VTILVOT) ratio of >2.5, are a sensitive way of selecting patients to undergo more invasive examination with transesophageal echocardiography.