[Correlations between left atrial size and parameters of averaged atrial signal in patients with paroxysmal atrial fibrillation in the course of ischemic heart diseases].

The aim of this study was to assess the correlation between left atrial size and atrial signal-averaged electrocardiogram (ALP) in time-domain and frequency analysis in patients with paroxysmal atrial fibrillation (PAF) during ischaemic heart disease (IHD). The study population consisted of 75 patients with PAF during IHD who were divided into two groups; gr. I (left atrial dimension 40 mm) and gr. II (left atrial dimension 40 mm). The control group (gr. III) consisted of 50 healthy subjects. Recording of ALP was carried out by HIPEC-200HA. The high gain ECG was recorded during basic rhythm with orthogonal Frank leads X,Y,Z. These signals were amplified, averaged and filters. The filtered signals were combined into a vector magnitude and time-domain and frequency analysis was done. These findings suggest that the size of the left atrium does not change time-domain and frequency parameters of ALP in patients with PAF and IHD. We noticed significant influence of IHD on these parameters. On the other hand frequency analysis of ALP did not show any uselessness in diagnostic identification of patients with PAF during IHD and healthy subjects.