title: Which patients with congestive heart failure may benefit from biventricular pacing?
abstract: BACKGROUND
  Biventricular pacing improves the clinical status and ventricular function in patients with congestive heart failure (CHF) and intraventricular conduction delay. However, patient selection criteria including NYHA functional class, rhythm, PR interval, QRS duration (QRSd), left ventricular ejection fraction (LVEF), left ventricular diastolic diameter (LVDD), and other variables are not clearly defined.
  
  
  OBJECTIVE
  To determine which and how many patients referred for an initial cardiac transplantation evaluation may be eligible for biventricular pacing (BP) according to the criteria of recently completed trials of cardiac resynchronization therapy (CRT).
  
  
  METHODS
  This was a retrospective review of 200 patients, whose mean age was 51 +/- 13 years (173 men). Sinus rhythm was present in 88% of the patients, 107 had a QRSd > 120 ms, and 38% had left bundle branch block. LVDD was 72.5 +/- 12 mm and LVEF 21.7 +/- 9.3%; 54% had mitral regurgitation.
  
  
  RESULTS
  When NYHA class, electrocardiographic, and ventricular function criteria were considered separately, a high proportion of patients appeared to be candidates for CRT: 70.5% were in NYHA functional class III/IV, 34% had QRSd > or = 150 ms, 60% had LVDD > or = 60 mm and 53.5% LVEF < or = 35%. However, the proportions of patients eligible for CRT were different according to the selection criteria of recently completed trials: 18% of the patients with InSync criteria, 13% of the patients with MUSTIC SR criteria, 0.5% with MUSTIC AF criteria, 27% of patients with MIRACLE criteria, and 35% of the patients with CONTAK CD criteria (without considering indications for implantable cardioverter defibrillator).
  
  
  CONCLUSIONS
  In this population-based study, a wide range of patients (13% to 35%) would have been candidates for CRT, according to the selection criteria of different completed trials.
authors.affiliation: Institute of Cardiology and Cardiovascular Surgery, Favaloro Foundation, University Foundation Dr. Rene G. Favaloro, Buenos Aires, Argentina. ngalizio@ffavaloro.org
authors.forename: Nestor O
authors.initials: NO
authors.lastname: Galizio
authors.forename: Ricardo
authors.initials: R
authors.lastname: Pesce
authors.forename: Elina
authors.initials: E
authors.lastname: Valero
authors.forename: Jose L
authors.initials: JL
authors.lastname: Gonzalez
authors.forename: Roberto R
authors.initials: RR
authors.lastname: Favaloro
authors.forename: Liliana
authors.initials: L
authors.lastname: Favaloro
authors.forename: Sergio
authors.initials: S
authors.lastname: Perrone
authors.forename: Pablo
authors.initials: P
authors.lastname: Davila
authors.forename: Miguel
authors.initials: M
authors.lastname: Godoy
mesh_terms: D002037:Bundle-Branch Block / Q000150:complications / Q000628:therapy; D002304:Cardiac Pacing, Artificial / Q000379:methods; D004562:Electrocardiography; D005260:Female; D006333:Heart Failure / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018579:Patient Selection; D012189:Retrospective Studies; D013318:Stroke Volume