Continuous Wave Doppler Free Essay Example, 1500 words

Aortic stenosis is the blood flow obstruction across the aortic valve. Aortic stenosis can be caused by congenital unicuspid or bicuspid valve, degenerative hardening of the valve, and rheumatic fever. 4 Studies of the association of aortic valve gradient verified by continuous wave Doppler ultrasound and that verified at catheterization procedure have always been evaluated in nonconcurring calculations. An assessment from instantaneous continuous wave Doppler ultrasound and catheter measurements of the pressure gradient in 44 adult patients was observed. OBJECTIVE: To detect the presence of aortic stenosis with the use of a noninvasive continuous wave Doppler. METHOD: Forty-four patients were assigned to a group: 24 patients with suspected aortic stenosis as Group A; and 20 healthy patients in Group B. Both groups were evaluated noninvasively by continuous wave Doppler ultrasound before cardiac catheterization procedure. Group A: Maximal velocity dimensions in ascending aorta = 3.0 to 5.8 m/s (mean 4.34 +/- 0.65Group B: Maximal velocity dimensions in ascending aorta = 1.0 to 1.6 m/s (mean 1.28 +/- 0.16)From the maximal velocity in Group A patients, the peak and mean pressure gradients crosswise the aortic valve were computed using the Bernoulli equation. We will write a custom essay sample on Continuous Wave Doppler or any topic specifically for you Only $17.96 $11.86/pageorder now RESULTS: The parallel correlations with the peak aortic valve gradient was achieved at cardiac catheterization (r = 0.79). In 20 patients belonging to Group A, the peak Doppler gradient was within one-fourth of the gradient derived at cardiac catheterization. Three patients were detected with high aortic stenosis. There was also an under-estimation of aortic valve gradient by slightly over one-fourth of the gradient in those 3 patients. The Doppler study was unsuccessful in determining significant aortic stenosis in just one patient. A considerable overestimation of the aortic valve gradient through the continuous wave Doppler ultrasound was not seen in all patients.