Relationship Between ECG-pattern of Depolarization Abnormalities and an Mildly Reduced Ejection Fraction

The aim of the study was to investigate the relationship between a left ventricular ejection fraction $(EF)$ and $ECG$ patterns associated with structural changes of the myocardium (pathological $Q$ wave, fragmentated $QRS$ complex $(fQRS)$, early repolarization pattern $(ERP). The$ study included 148. According to the level of $EF$, patients were divided into three groups: Group 1 - patients with low $EF(lEF)$ (less than 40%), group 2 - patients with mildly reduced $EF(mrEF)$ (40-49%); group 3 - patients with preserved $EF(pEF)$ (more than 50%). In the 1st group $(EF)fQRS$ was registered in 16 (51.6%) patients, in the mrEF - in 16 (18.2%). Pathological $Q$ wave was detected in $lEF$ in 20 (65%), in $mrEF$ in 10 (35%), 15 (18%), in $pEF$ in 15 (18%). The $fQRS$ has been found to be more important in identifying patients with $mrEF$, In $lEF$ in 2 (6.5%) patients, in mrEF - in 2 (6.9%), in pEF - in 11 (12.5%). There was no relationship between $ERP$ and $EF$.