Gepulste Doppler-Echokardiographie bei Aortenvitien

The diagnostic value of pulsed Doppler echocardiography (PDE) had not been sufficiently assessed up until now. Invasive catheter velocitometric measurements in the central vessels give quantitative information on the blood movement across the aortic and pulmonary valves. It is particularly useful in the quantification of aortic regurgitation. We successfully investigated 52 patients by means of PDE (ATL 500 A); 20 were suffering pure aortic incompetence, 11 pure stenosis and 21 had combined stenosis and regurgitation. Fifteen patients without aortic valvular disease served as controls. Our findings were compared with the results of cardiac catheterization and angiography in each case. In addition, 14 patients with aortic regurgitation were studied invasively by catheter velocitometry. The obtained regurgitation values were compared to the PDE method. In the PDE the underlying criteria for the assessment of the recordings were as follows: formal analysis of the analog signal and of the turbulence content during systole and diastole; in the flow velocity tracings aortic incompetence showed a steep increase with high peak to peak aortic velocities and scant turbulence formation; the reverse flow during regurgitation was accompanied by a high grade turbulent velocity pattern. The area under the diastolic (regurgitant) flow velocity curve (the time-amplitude integral) corresponded significantly with the angiographic severity of aortic insufficiency (r=0.87). In aortic stenosis, turbulence formation leads to an approximately flat velocity profile across the ascending aorta, if the region in the vicinity of the valve is omitted. The flow velocity analog signals are considerably disturbed. However, the turbulence content which can be qualitatively estimated from the recordings, correlates well with the calculated valve area. In combined aortic valve stenosis and incompetence, the prevailing turbulent pattern does not always permit one to assess sufficiently the severity of the stenotic component, whereas the grade of incompetence can be, in general, evaluated. PDE complements the existing non-invasive techniques and probably essentially enriches non-invasive diagnostics.