[Evaluation of the diagnostic effectiveness of the indicators of left atrial myocardial function in intraoperative cardiac weakness in patients with mitral valve defects].

Excursions of the left-atrial myocardium were recorded by tensiometric transducers in patients with mitral valvular disease. The structural features of myocardial excursions were evaluated as symptoms. Myocardial shortening in P-Q interval was considered a negative symptom in relation to heart weakness, shortening in T-Q interval as an indefinite symptom, and shortening in Q-T interval as a positive symptom. Appraisal of the sensitivity and specificity of these symptoms revealed their high diagnostic efficacy.