Purpose. To classify the various patterns of the PV anatomy based on multislice computed tomography (CT) evaluation in AF patients.

Methods. CT was performed prior to AF ablation in 167 (80 females) patients aged 18-79 years old, 107 (64.1%) paroxysmal and 39 (23.3%) persistent AF patients, in 21 (12.6%) patients type of AF was not identified.

Results. Subsequent anatomical patterns have been found. Type I (normal anatomy) – four independent PV with four separate ostia (n=88; 52.7%). Type II (dichotomous pattern) – three or more independent ipsilateral PV ostia (n=36; 21.5%). Type III (left common PV ostium) – coalescence of the left superior and left inferior PVs proximal to the left atrium (LA) (n=31; 18.6%). Type IV (combined pattern) – II and III pattern combination (n=10; 6%). Type V (Contralateral PV common ostium) – coalescence of the right and left inferior PVs proximal to the LA (n=1; 0.6%). Type VI (Right common PV ostium) – coalescence of the right PVs proximal to the LA (n=1; 0.6%).

Conclusion. PV anatomy was confirmed to be highly variable. Normal PV anatomical pattern in AF patients has been revealed in 52.7%. Dichotomous PV pattern, left common ostium presence and these combinations have been found less frequently. Common PV trunk and right common ostium were considered to be extremely rare patterns. These findings are supposed to be useful for appropriate ablation strategy selection.