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Noninvasive assessment of left atrial maximum dP/dt by a combination of transmitral and pulmonary venous flow.
Nakatani, S; Garcia, M J; Firstenberg, M S; Rodriguez, L; Grimm, R A; Greenberg, N L; McCarthy, P M; Vandervoort, P M; Thomas, J D.
Affiliation
  • Nakatani S; Cardiovascular Imaging Center and the Department of Cardiology, The Cleveland Clinic Foundation, Ohio 44195, USA.
J Am Coll Cardiol ; 34(3): 795-801, 1999 Sep.
Article in En | MEDLINE | ID: mdl-10483962
ABSTRACT

OBJECTIVES:

The study assessed whether hemodynamic parameters of left atrial (LA) systolic function could be estimated noninvasively using Doppler echocardiography.

BACKGROUND:

Left atrial systolic function is an important aspect of cardiac function. Doppler echocardiography can measure changes in LA volume, but has not been shown to relate to hemodynamic parameters such as the maximal value of the first derivative of the pressure (LA dP/dt(max)).

METHODS:

Eighteen patients in sinus rhythm were studied immediately before and after open heart surgery using simultaneous LA pressure measurements and intraoperative transesophageal echocardiography. Left atrial pressure was measured with a micromanometer catheter, and LA dP/dt(max) during atrial contraction was obtained. Transmitral and pulmonary venous flow were recorded by pulsed Doppler echocardiography. Peak velocity, and mean acceleration and deceleration, and the time-velocity integral of each flow during atrial contraction was measured. The initial eight patients served as the study group to derive a multilinear regression equation to estimate LA dP/dt(max) from Doppler parameters, and the latter 10 patients served as the test group to validate the equation. A previously validated numeric model was used to confirm these results.

RESULTS:

In the study group, LA dP/dt(max) showed a linear relation with LA pressure before atrial contraction (r = 0.80, p < 0.005), confirming the presence of the Frank-Starling mechanism in the LA. Among transmitral flow parameters, mean acceleration showed the strongest correlation with LA dP/dt(max) (r = 0.78, p < 0.001). Among pulmonary venous flow parameters, no single parameter was sufficient to estimate LA dP/dt(max) with an r2 > 0.30. By stepwise and multiple linear regression analysis, LA dP/dt(max) was best described as follows LA dP/dt(max) = 0.1 M-AC +/- 1.8 P-V - 4.1; r = 0.88, p < 0.0001, where M-AC is the mean acceleration of transmitral flow and P-V is the peak velocity of pulmonary venous flow during atrial contraction. This equation was tested in the latter 10 patients of the test group. Predicted and measured LA dP/dt(max) correlated well (r = 0.90, p < 0.0001). Numerical simulation verified that this relationship held across a wide range of atrial elastance, ventricular relaxation and systolic function, with LA dP/dt(max) predicted by the above equation with r = 0.94.

CONCLUSIONS:

A combination of transmitral and pulmonary venous flow parameters can provide a hemodynamic assessment of LA systolic function.
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Collection: 01-internacional Database: MEDLINE Main subject: Pulmonary Veins / Atrial Function, Left / Mitral Valve Type of study: Prognostic_studies Limits: Adult / Aged / Female / Humans / Male / Middle aged Language: En Journal: J Am Coll Cardiol Year: 1999 Type: Article Affiliation country: United States
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Collection: 01-internacional Database: MEDLINE Main subject: Pulmonary Veins / Atrial Function, Left / Mitral Valve Type of study: Prognostic_studies Limits: Adult / Aged / Female / Humans / Male / Middle aged Language: En Journal: J Am Coll Cardiol Year: 1999 Type: Article Affiliation country: United States