[Determination of the transvalvular gradient using continuous wave Doppler in @entity1 with XXXX . Correlation with the hemodynamic method].

@entity1 @entity339 @entity4794
In order to assess the reliability of Doppler echocardiography in the determination of mean @entity339 38 consecutive @entity1 (pts) affected by rheumatic @entity4794 ( @entity4794 ) were analyzed by continuous wave Doppler echocardiography (CWD). Cardiac catheterization (CATH) was performed within 24 hours from echocardiographic examination. The mean diastolic @entity339 ( @entity339 ) at CATH was calculated by planimetry from simultaneously recorded left ventricular and pulmonary artery wedge pressure. The maximal velocity profile through the mitral valve was used to calculate pressure gradient by CWD. A mean @entity339 was calculated for each @entity1 by the planimetered velocity profile throughout diastole. @entity339 determined by CATH ranged from 6 to 31 mmHg (mean 15.2 +/- 6.0); @entity339 determined by CWD ranged from 4 to 18 mmHg (mean 10 +/- 3.7). The correlation between CWD and CATH by linear regression analysis was: y = 0.53 X + 1.8; r = 0.85; p less than 0.001. Mean % error of CWD in the assessment of @entity339 was 34.7%. In conclusion this study indicates that CWD seems systematically underestimate @entity339 with respect to CATH. The identification of CWD flow tracings "optimal" for analysis could not represent the maximal velocity of transmitral jet, which is a complex three dimensional entity. In addition non-simultaneous determinations of gradient and day-to-day variations in cardiac output may account for discrepancies between CWD and CATH measurements.
