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Heart failure with normal ejection fraction (HFNEF) is now the most prevailing model of HF in different epidemiological studies, and abnormalities in mild systolic function (subclinical) have been observed in those patients when the left ventricular contractility (LV) is evaluated in the longitudinal axis (S') by tissue Doppler echocardiography (TDE), even in normal LV ejection fraction.

Avaliação da função sistólica longitudinal na insuficiência cardíaca com fração de ejeção normal