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Tento přehledový článek shrnuje a porovnává metodiku a výsledky dostupných originálních prací zabývajících se hodnocením anatomických variant plicních žil u pacientů s fibrilací síní publikovaných v posledních dvou desetiletích. Existující studie ukazují, že znalost anatomických variant plicních žil je důležitým předpokladem pro úspěšně provedenou katétrovou ablaci fibrilace síní. V textu se věnujeme analýze a vzájemnému srovnání metodiky a výsledků použitých při hodnocení původních autorů.Klíčová slova: plicní žíly, fibrilace síní, anatomické varianty. Evaluation of pulmonary vein anatomical variants in patients with atrial fibrillationThis review summarizes and compares the methods and results of available original papers on the evaluation of anatomical variants of pulmonary veins in patients with atrial fibrillation published in the last two decades. The studies included show that an understanding of anatomical variants of pulmonary veins is an important prerequisite for successful catheter ablation of atrial fibrillation. The present text deals with an analysis and mutual comparison of the methods and results used in various evaluations of the original authors.

Introduction Differences in conduction times from right ventricle to left ventricle and from left ventricle to right ventricle respectively were observed during biventricular devices implantation when changing pacing vector direction. In this article the phenomenon of interventricular conduction time differences is described and assessed in relationship to various clinical and electrophysiological parameters. Methods In 62 consecutive patients (9 females) interventricular conduction times between right and left ventricle in both directions were measured during cardiac resynchronization therapy device implantation procedure. Complex pacing protocol was performed. Results Investigated individuals was divided into 3 subgroups according to type of interventricular conduction pattern and statistically tested with various clinical data. Substantial differences in right-to-left vs left-to-right conduction times (> 5 ms, range 7-72 ms) were observed in 24 (39%) of all patients. They were more common in patients with dilated cardiomyopathy (20 of 38, 53%) compared to 4 (17%) of 24 patients with coronary artery disease (p = 0.011). The phenomenon occurred more often in hypertensive patients (p = 0.012). Other tested factors were nonsignificant. Conclusions There are almost no data on this topic. The occurrence of conduction difference phenomenon is quite common in dilated cardiomyopathy while it is rare in coronary artery disease.