title: Comorbidities of Chronic Complete Right Bundle Branch Block and Correlations With Coronary Angiographic Findings.
abstract: BACKGROUND
  This is a prospective, observational review of medical records to investigate the associated comorbidities and angiographic anatomy in patients with chronic right bundle branch block (RBBB).
  
  
  METHODS
  The analyses of 32,345 consecutive electrocardiograms (EKGs) between October 2010 and January 2012 revealed 583 patients with RBBB. The common comorbidities associated with RBBB were hypertension (82%), diabetes (42%), coronary artery disease (CAD) (44%), valvular heart disease (aortic--16% and mitral--17%) and pulmonary disease (33%). Demographic data including age, sex, EKG and associated comorbidities were analyzed from the medical records. Coronary angiograms within 6 months of EKG in patients with RBBB were available for 184 patients and were accordingly analyzed for significant obstructive CAD.
  
  
  RESULTS
  In all, 33 patients had single-vessel disease, 52 patients had 2-vessel disease, and 87 patients had multivessel disease whereas 12 patients had no significant disease. Left anterior descending artery was the most frequent vessel involved (72%) followed by left circumflex (58%) and right coronary artery (53%).
  
  
  CONCLUSIONS
  In conclusion, in chronic RBBB, wherever the angiograms were available, CAD predominantly involved left anterior descending artery. Most common associated comorbidities in chronic RBBB were systemic hypertension and CAD.
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Arham
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Ravindra
authors.initials: R
authors.lastname: Bhardwaj
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV. Electronic address: ajain@hsc.wvu.edu.
authors.forename: Abnash
authors.initials: A
authors.lastname: Jain
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Imran
authors.initials: I
authors.lastname: Dar
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Sumesh
authors.initials: S
authors.lastname: Jain
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Bradford
authors.initials: B
authors.lastname: Warden
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Wissam
authors.initials: W
authors.lastname: Gharib
authors.affiliation: Department of Medicine, West Virginia University Heart Institute, Morgantown, WV.
authors.forename: Walid
authors.initials: W
authors.lastname: Gharib
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002037:Bundle-Branch Block / Q000453:epidemiology* / Q000209:etiology; D015897:Comorbidity; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000453:epidemiology* / Q000209:etiology; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D014903:West Virginia / Q000453:epidemiology
keywords: Angiogram; Electrocardiogram; Right bundle branch block