Comparison of Doppler-derived pressure gradient to that determined at cardiac catheterization in adults with XXXX : implications for management.

@entity1 @entity998 @entity472 @entity337 @entity453 @entity340
Over a 1-year period cardiac catheterization was performed in 58 @entity1 , mean age 66 years, who had elevated aortic blood flow velocity (more than 1.7 m/s) by continuous-wave Doppler echocardiography. Doppler echo signals were initially judged acceptable for quantitative analysis in 95% of @entity1 , usually from the apical transducer position. Cardiac catheterization was performed within a mean of 8 days (60% within 1 day) of the Doppler echo study. The aortic valve mean pressure gradients at catheterization ranged from 0 to 93 mm Hg. The linear correlation coefficient (r value) between the mean pressure gradient determined by Doppler echocardiography and catheterization was 0.87. The correlation was maintained in 15 @entity1 with @entity337 (r = 0.91) and in 16 @entity1 with significant @entity453 (r = 0.93). In the 16 @entity1 with @entity998 (mean 3.2 liters/min, range 2.2 to 3.9) the correlation was 0.81. A strategy for using the Doppler echo-calculated pressure gradient to manage @entity1 with @entity340 ( @entity472 ) was derived by investigating the relation of the Doppler echo gradient to the aortic valve area in 35 @entity1 with no @entity337 detected at catheterization. All 12 @entity1 with a Doppler echo mean gradient of less than 30 mm Hg had an aortic valve area of more than 0.75 cm2 and all 11 @entity1 with a Doppler echo mean gradient of more than 50 mm Hg had an aortic valve area of less than 0.75 cm2.(ABSTRACT TRUNCATED AT 250 WORDS)
