[Asynchrony of atrial contractions in mitral-tricuspid heart defects and its clinical significance (according to cardiac catheterization findings)].

A temporal analysis of the pressure curves recorded in the right and left atria revealed that in mitral-tricuspid heart diseases the asynchronism of atrial contractions was 2--6 fold as compared to the normal cases [on the average, 0.05--0.06 (0.02--0.13) sec., the normal being 0.02 sec]. The delay in the left atrial contraction is due to the deceleration of interatrial conduction of the excitation. Due to the increased asynchronism different shapes of a-waves are recorded in the right and left atria, as well as presystolic gradients of pressure at the level of the left and right atrioventricular orifices and presystolic murmurs of different shapes typical of mitral (crescendo) and tricuspid (crescendo-decrescendo) stenoses.