title: Exercise-induced ventricular arrhythmias: analysis of predictive factors in a population with sleep disorders.
abstract: OBJECTIVE
  To assess the prevalence of ventricular arrhythmias induced by exercise in a population with sleep disorders and to analyze the triggering factors.
  
  
  METHODS
  Patients were consecutively selected from the database of the Sleep Clinic of Universidade Federal de São Paulo. All subjects were submitted to basal polysomnography, blood sample collection, physical examination, 12-lead ECG, spirometry, cardiorespiratory exercise study on a treadmill, and echocardiogram. The Control Group was matched for age and gender.
  
  
  RESULTS
  A total of 312 patients were analyzed. Exercise-induced ventricular arrhythmia was observed in 7%. The aortic diameter was larger (3.44 ± 0.30, 3.16 ± 0.36, p = 0.04) and the minimal saturation was lower (92.75 ± 3.05, 95.50 ± 1.73, p=0.01) in the ventricular arrhythmia group when compared to controls, respectively. After correction of the aortic root to body surface, there was only a trend to a larger diameter being associated with the emergence of arrhythmia.
  
  
  CONCLUSIONS
  Exercise-induced ventricular arrhythmia was observed in 7% of sample and it was associated with lower oxygen saturation during exercise.
authors.affiliation: Cardiac Arrhythmia Center, Hospital Israelita Albert Einstein - HIAE, São Paulo, SP, Brazil.
authors.forename: Fatima Dumas
authors.initials: FD
authors.lastname: Cintra
authors.affiliation: Cardiology Program, Hospital Israelita Albert Einstein - HIAE, Brazil.
authors.forename: Marcia Regina Pinho
authors.initials: MR
authors.lastname: Makdisse
authors.affiliation: Echocardiography Department, Hospital Israelita Albert Einstein - HIAE, São Paulo, SP, Brazil.
authors.forename: Wercules Antônio Alves de
authors.initials: WA
authors.lastname: Oliveira
authors.affiliation: Instituto do Sono, São Paulo, SP, Brazil.
authors.forename: Camila Furtado
authors.initials: CF
authors.lastname: Rizzi
authors.affiliation: Department of Ergometry, Hospital Israelita Albert Einstein - HIAE, São Paulo, SP, Brazil.
authors.forename: Francisco Otávio de Oliveira
authors.initials: FO
authors.lastname: Luiz
authors.affiliation: Department of Psychobiology, Universidade Federal de São Paulo - UNIFESP, São Paulo, SP, Brazil.
authors.forename: Sergio
authors.initials: S
authors.lastname: Tufik
authors.affiliation: Cardiac Arrhythmia Center, Hospital Israelita Albert Einstein - HIAE, Brazil.
authors.forename: Angelo Amato Vincenzo de
authors.initials: AA
authors.lastname: Paola
authors.affiliation: Department of Psychobiology, Universidade Federal de São Paulo - UNIFESP, São Paulo, SP, Brazil.
authors.forename: Dalva
authors.initials: D
authors.lastname: Poyares