[Continuous emission Doppler study with spectrum analysis in the evaluation of aortic stenosis in adults. Apropos of 30 cases].
The value of continuous wave doppler with spectral analysis for the evaluation of aortic stenosis in adults being controverted, we analyzed prospectively the results obtained in 30 consecutive elderly patients (mean age 63 years) investigated by invasive and non-invasive methods. In 24 patients who underwent both ultrasonic and catheter examinations, the correlation between mean gradients measured by catheterization and calculated separately by doppler was 0.80. For a semi-quantitative evaluation of the aortic valve area, we suggest to use an additional severity index R calculated from doppler data (R = mean gradient/maximal instantaneous gradient) which correlated well (r = -0.68) with the aortic valve area. In our experience, this index makes it possible to separate patients with a less than 0.75 cm2 aortic valve area, as calculated from Gorlin's formula (R greater than 0.65) from patients with a more than 0.75 cm2 aortic valve area (R less than 0.65), irrespective of the associated cardiac index. It is concluded that the doppler ultrasound method provides a highly satisfactory evaluation of transaortic gradient, as well as a semi-quantitative evaluation of the stenotic aortic ostium in the majority of elderly patients with aortic stenosis.
D000328:Adult; D000368:Aged; D001024:Aortic Valve Stenosis / Q000145:classification / Q000175:diagnosis* / Q000503:physiopathology; D001783:Blood Flow Velocity; D006328:Cardiac Catheterization; D004452:Echocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011312:Pressure; D011446:Prospective Studies
Le Doppler à émission continue avec analyse spectrale dans l'évaluation des sténoses aortiques de l'adulte. A propos de 30 cas.