Screening echocardiography 2 dimensional echocardiographic will be obtained from the parasternal and apical windows. Pulsed Doppler measurements of mitral inflow will be obtained with the transducer in the apical four-chamber view, with a 1-2 mm Doppler sample volume placed between the tips of mitral leaflets during diastole. Tissue Doppler imagining of the mitral annulus will be obtained from the apical 4-chamber view with a 1.5-mm sample volume placed at the medial mitral annulus. All Doppler echocardiographic examinations are done with horizontal sweep set to 100 mm/s. At least 3-5 cardiac cycles will be measured. LA volume will be obtained from the apical 4 and 2 chamber views with a zoomed image of the left atrium. Clinically indicted echocardiograms performed in the echolab may be used as screening echocardiograms.