Search for: [Abstract = "95%\)\; in the remaining 26% \(group B\) PAS occasionally fell below 95%. No statistically significant differences in the atrial potential parameters were found during intra\-operative measurements for both groups. A statistically significant correlation between the width of the P wave of the surface ECG and the effectiveness of PAS was clearly demonstrated. In group B, P wave was longer than in group A \(105±16 ms vs group A\: 94±14 ms\; p < 0,005\). Similar correlations were found for the echo parameters. The dimensions of the right heart chambers were greater for group B \(RVEDD\- B\: 28.9±5.3 mm vs A\: 24.5±4.4 mm\; RVESD\- B\: 22.8±5.4 mm vs A\: 19.9±3.8 mm\; WGD RA\- B\: 56.5±6.8 mm vs A\: 52.4±5.5 mm\; WBP RA\- B\: 46.4±5.3 mm vs A\: 42.7±6.2 mm\; RAarea in B\: 21.8±3.5 cm2, in A\: 18.4±3.3 cm2\; RAvol \- B\: 71.0±21.3 ml, A\: 55.5±16 ml\), as were those for the left ventricle \(LVEDD in B\: 59.1±7.4 mm, in A\: 54.9±6.0 mm\; LVESD w B\: 39.9±11.0 mm, A\: 35.9±7.9 mm\) and the left atrium \(WPT LA\: in B\:46.4±6.2 mm, in A\: 42.2±7.7 mm\; WGD LA in B\: 60.3±9.7 mm, in A\: 51.6±9.9 mm\; WBP LA for B\: 49.0±6.6 mm, and for A\: 43.7±12.1 mm\). Patients in group B had a lower ejection fraction \(49.4±13.7% in B vs 58.2±11.3% in A\) and showed symptoms of heart failure. CONCLUSIONS\: 1. VDD\/R stimulation with a single\-pass lead is reliable in achieving effective AV synchronization over a 12\-month follow\-up. 2. The parameters"]

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