Semiquantitative evaluation of aortic regurgitation by Doppler echocardiography: Effects of associated mitral stenosis

Abstract

The accuracy of pulsed and continuous wave (CW) Doppler methods for evaluating aortic regurgitation (AR) was compared in patients with and without mitral stenosis (MS), with aortic root angiography as a gold standard. AR was diagnosed with pulsed Doppler echocardiography, by the detection of broad frequency spectral patterns in the isovolumic relaxation time. If these indications were present, AR was graded by examining the extent of diastolic turbulence in the left ventricular cavity (flow mapping method). With CW Doppler echocardiography, AR was diagnosed by the detection of a peak velocity of > 2 m/s; if this velocity was attained, AR was graded by measuring the time from the peak velocity to half the peak veloclty (half-time method). The anglographic grade corresponded to that determined by the pulsed and CW Doppler methods in 37 and 37 of 48 patients without MS, respectively. Angiographic grade corresponded to the grade determined by the pulsed and CW Doppler methods in 13 and 17 of the 23 patients with MS, rospectively. Elght of 10 discrepancles between pulsed Doppler and angiographic grades were due to overestimation of AR by the flow mapping method, apparentiy because the transmitral jet produces diastollc turbulence in the left ventricular cavity indepondent of AR. On the other hand, three of six discrepancles between CW Doppler and angiographic grades were due to the incapability of detecting signals of AR by CW Doppler echocardiography. Thus both the pulsed and the CW Doppler methods are useful to evaluate AR in patients without MS. In patients with MS, however, AR is most accurately diagnosed by the detection of AR signals in the isovolumic relaxation time by pulsed Doppler echocardiography, and the degree of AR is more accurately assessed by the CW Doppler half-time method.