title: Correlation of accessory pathway location with gender and their manifest or concealed presentation.
abstract: BACKGROUND
  Atrioventricular reentrant tachycardias account for approximately one third of cases referred for electrophysiological study (EPS). The anatomical substrate responsible for the reentry is an accessory pathway (AP) able to conduct the electrical stimulus in an anterograde, retrograde or bidirectional manner.
  
  
  OBJECTIVE
  To evaluate the correlation of AP location with the male and female genders and AP clinical presentation, whether manifest or concealed.
  
  
  METHODS
  Retrospective observational study including 942 consecutive patients, all diagnosed with EPS-confirmed AP from January 1994 to December 2008. APs were classified into eight anatomical groups: left lateral (LL), left posterior (LP), left posteroseptal (LPS), right posteroseptal (RPS), right midseptal (RMS), right anteroseptal (RAS), right lateral (RL), and right posterior (RP).
  
  
  RESULTS
  Of the 942 patients, 52.6% were males. The mean age was 31.2±13.8years. As regards gender, APs were more prevalent among men. However, a statistically significant difference was observed only in the LPS (p=0.029) and RL (p=0.003) regions. In relation to the form of presentation of AP, the manifest form was more frequent than the concealed form in six of the eight regions studied, except for the LL and LPS regions.
  
  
  CONCLUSIONS
  AP predominated in males and the manifest form was more frequent than the concealed form in most of the regions studied.
authors.affiliation: Universidade Federal de Alagoas, Universitary Hospital of Alagoas, Brazil. Electronic address: crcferro@uol.com.br.
authors.forename: Carlos Romério Costa
authors.initials: CR
authors.lastname: Ferro
authors.affiliation: Universidade Federal de Alagoas, Universitary Hospital of Alagoas, Brazil.
authors.forename: Francisco
authors.initials: F
authors.lastname: de Assis Costa
authors.affiliation: Universidade Federal de Alagoas, Universitary Hospital of Alagoas, Brazil.
authors.forename: Maria Alayde
authors.initials: MA
authors.lastname: Mendonça
authors.affiliation: Universidade Federal de Alagoas, Universitary Hospital of Alagoas, Brazil.
authors.forename: Ivan
authors.initials: I
authors.lastname: Rivera
authors.affiliation: Universidade Estadual de Ciencias da Saude de Alagoas, Cardiology, Brazil.
authors.forename: Fabiana Piech Nunes
authors.initials: FP
authors.lastname: Ferro
authors.affiliation: Universidade Estadual de Ciencias da Saude de Alagoas, Cardiology, Brazil.
authors.forename: Jadilma Mafra
authors.initials: JM
authors.lastname: Barbosa
authors.affiliation: Universidade Federal de Alagoas, Universitary Hospital of Alagoas, Brazil.
authors.forename: Alfredo Dias Oliveira
authors.initials: AD
authors.lastname: Filho
authors.affiliation: Universidade Federal de Sao Paulo, Cardiology, Brazil.
authors.forename: Rui
authors.initials: R
authors.lastname: Póvoa
authors.affiliation: Universidade Federal de Sao Paulo, Cardiology, Brazil.
authors.forename: Claudio
authors.initials: C
authors.lastname: Cirenza
authors.affiliation: Universidade Federal de Sao Paulo, Cardiology, Brazil.
authors.forename: Angelo Amato Vicenzo
authors.initials: AA
authors.lastname: de Paola
mesh_terms: D058606:Accessory Atrioventricular Bundle / Q000453:epidemiology* / Q000503:physiopathology; D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012727:Sex Characteristics; D017180:Tachycardia, Ventricular / Q000453:epidemiology* / Q000503:physiopathology; D055815:Young Adult
keywords: Accessory pathway; Concealed presentation; Manifest presentation; Wolff–Parkinson–White