Área valvar mitral através de medidas de meia-pressão em átrio esquerdo e capilar pulmonar

Abstract

Objective: To confirm the validity of the calculation in MVA applying the method of Doppler pressure half-time directly in left atrial (LA) and pulmonary capillary pressure curve. Methods:Thirty-five patients with mitral valve stenosis underwent percutaneous mitral valvotomy (PMV) using the Cribier method with MVA measurement made using the traditional methods (Gorlin and echo-Doppler) and this propose. MVA values obtained were compared and a linear regression model was used to obtain formula for reciprocal calculations of the mitral valve area.Results: A statistically correlation was found between the calculated values by all methods. The proposed method showed a strong correlation (p< 0.05) with the others mainly before valve opening. Simple reciprocal calculation formulas were found for mitral valve area assessment. Conclusions:The proposed method for the calculation of mitral valve area using LA or Cap proved to be highly accurate and simple making it possible to safely monitor valvotomy procedures.Key words: Pressure half-time, mitral valve area by half-pressure, left atrium of the half-pressure.