[Atrial fibrillation prevalence and treatment with oral anticoagulation in patients with permanent pacemakers]. 
Atrial Fibrillation (AF) is the most important risk factor for stroke and thromboembolic events (TE).  The aims of this study were to determine the prevalence of AF among patients with permanent pacemakers (PPM), the percentage of anticoagulated patients and the prevalence on TE in this population.  The secondary purpose was to determine the "level of knowledge" about indications of anticoagulation for AF patients.  This was a descriptive and retrospective study on a consecutive series of patients referred for PPM implantation.  Cardiovascular risk factors, indications for pacing, prior history of AF, TE and anticoagulation indication were analyzed.  In order to determine possible causes for not indicating anticoagulation, an electronic survey was sent to all doctors that usually refer patients for PPM implant and follow-up to our clinic.  Among 934 patients, 26% (244) presented AF of which 34% were anticoagulated.  77.3% presented a CHADS2 score of > or = 2 while only 2% had absolute contraindication for anticoagulation.  The prevalence of TE was 9%.  More than 60% of the doctors answered the survey.  More than 40% acknowledged the CHADS, score but only 33% were able to recognize all variables included in the score and 23% were able to determine when to indicate anticoagulation properly.  A low anticoagulation rate was detected among patients with AF and PPM with a high prevalence of TE and stroke.  An extremely low adherence to international guidelines was detected among doctors that usually deal with this sort of patients.