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Abstract
To evaluate the effect of alteration of left atrial pressure. volume and wall tension on the circulating plasma level of atrial natriuretic peptide(ANP), 15 patients with left atrial hypertension due to mitral stenosis were studied at the time of percutaneous balloon mitral valvuloplasty(PMV). Hemodynamic measurements and plasma atrial natriuretic peptde levels were obtained before, immediately(5-10min) after and 24h after valvuloplasty, and echocardiographic left atrial size, wall tension and mitral valve area were measured bdfore and 24h after valvuloplasty.
1) Immediately after valvuloplasty, left atrial pressure, pulmonary atrial pressure and mean diastolic pressure gradient across the mitral valve decreased, and the mitral valve area by Gorlin's method increased, significantly. Plasma atrial natriuretic peptide level(atright and left atrium, pulmonary artery and aorta) rose significantly after balloon inflation. This rising may reflect a transient increase in left atrial pressure and volume expansion associated with mitral valve occlusion by balloon.
2) Twenty four after valvuloplasty, mitral valve area increased, and left atrial volume and wall tension decreased, significantly. Plasma atrial natriuretic peptide level(at right atrium, pulmonary artery and aorta) fell significantly, too.
In conclusion, change of plasma atrial natriuretic peptide le.vel before and after percutaneous balloon mitral valvuloplasty reflect hemodynamic alteration of right and left atrium.
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