AORTIC-VALVE RESISTANCE IN AORTIC-STENOSIS - DOPPLER-ECHOCARDIOGRAPHIC STUDY AND SURGICAL CORRELATION

Four hundred seven patients with aortic stenosis who had Doppler echoc ardiography before surgery were studied to determine the feasibility o f Doppler-derived valve resistance calculation and its clinical valve. Patients with milder aortic stenosis had lower mean gradient, larger valve area, and lower maximal resistance than those with severe stenos is. Maximal resistance was related strongly to aortic stenosis severit y but did not add any information after valve area and gradient were k nown and was not related to surgical mortality.