title: [Left ventricular synchrony with septum stimulation vs. septal ventricular outflow tract in complete atrioventricular block].
abstract: BACKGROUND
  Placing the right ventricular pacing electrode in different places than the apex is less deleterious to the ejection fraction and left ventricular synchrony. Currently it is not defined which non apical site is better alternative. The aim of this paper was to determine if there is a difference in systolic function and left ventricular synchrony with stimulation of medial septum or outflow tract of the right ventricle in patients with atrioventricular block and pacemaker device.
  
  
  METHODS
  This was an observational analytical cross study. The patients included in this study were the population over 18 years old, diagnosed with atrioventricular block and pacemaker device. Two groups were divided according to the site of electrode placement whether in medial septum region or outflow tract of the right ventricle. The ejection fraction and left ventricular synchrony was determined by echocardiogram.
  
  
  RESULTS
  54 patients were included in each group, with similar demographic characteristics, except for the time of placement of ventricular electrode (p = < 0.001). No significant difference in ejection fraction or left ventricular synchrony was found.
  
  
  CONCLUSIONS
  There were no differences in ejection fraction or left ventricular synchrony regardless of the ventricular electrode placement.
authors.affiliation: Hospital de Especialidades 1, Centro Médico Nacional Bajío, Instituto Mexicano del Seguro Social, León, Guanajuato, México. enriquebernalmd@yahoo.com.mx.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Rodríguez-Serrano
authors.forename: Susano
authors.initials: S
authors.lastname: Lara-Vaca
authors.forename: Texar
authors.initials: T
authors.lastname: Pereyra-Nobara
authors.forename: Enrique
authors.initials: E
authors.lastname: Bernal-Ruiz
mesh_terms: D000328:Adult; D000368:Aged; D054537:Atrioventricular Block / Q000503:physiopathology / Q000628:therapy*; D003430:Cross-Sectional Studies; D004599:Electric Stimulation Therapy / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011446:Prospective Studies; D013318:Stroke Volume; D016896:Treatment Outcome; D016277:Ventricular Function, Left / Q000502:physiology*
keywords: Artificial pacemaker; Heart ventricles; Ventricular function