title: [Myocardial perfusion study in patients with right bundle branch block].
abstract: OBJECTIVE
  To evaluate the sensitivity and specificity of myocardial perfusion scintigraphy in the detection of coronary artery disease in patients with right bundle branch block (RBBB).
  
  
  METHODS
  Thirty one patients (24 male, 62.3 +/- 10.5 years) with RBBB, submitted to myocardial perfusion scintigraphy associated with exercise (n = 7) or dipyridamole (n = 24) and previous cinecoronariography were studied retrospectively. Left ventricle scintigraphic image was divided in three segments corresponding to the three main epicardic coronary territories in a total of 93 segments. Cineangiographic and scintigraphic data were then compared according to the different artery territories.
  
  
  RESULTS
  Twenty three patients had significant lesions (> or = 60%) in one or more coronary arteries and eight had no obstruction. Forty nine segments were irrigated by normal coronary arteries and 44 were related to arteries that had significant lesions. Twenty out of twenty three patients showed alterations in perfusion (sensitivity = 87%). All patients without coronary obstructions showed normal perfusion scintigraphy (specificity = 100%). One of the segments perfused by normal coronaries showed abnormal scintigraphy. Scintigraphy showed perfusion defects in 29 out of 44 segments with coronary obstructions. Sensitivity and specificity of the method for each arterial territory were 72% and 100% (left descending coronary artery), 67% and 94% (right coronary artery), 55% and 100% (circunflex coronary artery), respectively.
  
  
  CONCLUSIONS
  The presence of RBBB does not modify the sensitivity and specificity of the method in the detection of coronary artery disease.
authors.affiliation: Instituto do Coração do Hospital das Clínicas, FMUSP.
authors.forename: R L
authors.initials: RL
authors.lastname: de Paula
authors.forename: M C
authors.initials: MC
authors.lastname: Giorgi
authors.forename: J
authors.initials: J
authors.lastname: Soares Júnior
authors.forename: A P
authors.initials: AP
authors.lastname: Moraes
authors.forename: M
authors.initials: M
authors.lastname: Izaki
authors.forename: G G
authors.initials: GG
authors.lastname: Cerri
authors.forename: F
authors.initials: F
authors.lastname: Pileggi
authors.forename: J C
authors.initials: JC
authors.lastname: Meneghetti
mesh_terms: D002037:Bundle-Branch Block / Q000150:complications* / Q000000981:diagnostic imaging; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging* / Q000209:etiology; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D016555:Matched-Pair Analysis; D011877:Radionuclide Imaging; D012189:Retrospective Studies; D012680:Sensitivity and Specificity