TY - JOUR

T1 - Prognostic importance of change in QRS duration over time associated with left ventricular dysfunction in patients with congestive heart failure: the DIAMOND study

AU - Fosbøl, Emil Loldrup

AU - Seibaek, Marie

AU - Brendorp, Bente

AU - Torp-Pedersen, Christian

AU - Køber, Lars

AU - Danish Investigations and Arrhythmia on Dofetilide (Diamond) Study Group

AU - Fosbøl, Emil Loldrup

AU - Seibaek, Marie

AU - Brendorp, Bente

AU - Torp-Pedersen, Christian

AU - Køber, Lars

AU - Danish Investigations and Arrhythmia on Dofetilide (Diamond) Study Group

N1 - Keywords: Aged; Aged, 80 and over; Denmark; Double-Blind Method; Electrocardiography; Female; Follow-Up Studies; Heart Failure; Heart Rate; Humans; Male; Middle Aged; Prognosis; Survival Rate; Time Factors; Ventricular Dysfunction, Left

PY - 2008/12/1

Y1 - 2008/12/1

N2 - BACKGROUND: The prognostic importance reported for QRS duration in patients with heart failure (HF) and left ventricular dysfunction varies. No prior study has investigated the prognostic importance of change in QRS duration over time. METHODS AND RESULTS: The Danish Investigations and Arrhythmia ON Dofetilide (DIAMOND) study randomized 1518 patients with HF to dofetilide (class III antiarrhythmic drug) or placebo. All patients had left ventricular dysfunction. QRS duration was systematically measured at randomization and every 3 months after that. During 10 years of follow-up, 1324 (89%) of the patients died. QRS duration increased from baseline by 1.36 ms (95% confidence interval [CI]: -0.26 to -2.98; P = .1) after 12 months and by 3.65 ms (CI: 0.22-7.07; P = .04) after 24 months. QRS duration measured at baseline was not of prognostic significance after multivariable adjustment (adjusted hazard ratio [HR] 1.01, CI: 0.99-1.04; P = .2 per 10-ms increment in QRS duration). The adjusted relative risk associated with a 10-ms increase in QRS duration over time was 2% (HR 1.02, CI: 1.01-1.04; P = .03). A 10-ms increment in QRS 12 months after randomization was associated with a HR of 1.05 (CI: 1.00-1.09; P = .03). CONCLUSIONS: In patients with left ventricular dysfunction and HF, QRS duration increased over time and the increase was associated with increasing mortality.

AB - BACKGROUND: The prognostic importance reported for QRS duration in patients with heart failure (HF) and left ventricular dysfunction varies. No prior study has investigated the prognostic importance of change in QRS duration over time. METHODS AND RESULTS: The Danish Investigations and Arrhythmia ON Dofetilide (DIAMOND) study randomized 1518 patients with HF to dofetilide (class III antiarrhythmic drug) or placebo. All patients had left ventricular dysfunction. QRS duration was systematically measured at randomization and every 3 months after that. During 10 years of follow-up, 1324 (89%) of the patients died. QRS duration increased from baseline by 1.36 ms (95% confidence interval [CI]: -0.26 to -2.98; P = .1) after 12 months and by 3.65 ms (CI: 0.22-7.07; P = .04) after 24 months. QRS duration measured at baseline was not of prognostic significance after multivariable adjustment (adjusted hazard ratio [HR] 1.01, CI: 0.99-1.04; P = .2 per 10-ms increment in QRS duration). The adjusted relative risk associated with a 10-ms increase in QRS duration over time was 2% (HR 1.02, CI: 1.01-1.04; P = .03). A 10-ms increment in QRS 12 months after randomization was associated with a HR of 1.05 (CI: 1.00-1.09; P = .03). CONCLUSIONS: In patients with left ventricular dysfunction and HF, QRS duration increased over time and the increase was associated with increasing mortality.

U2 - 10.1016/j.cardfail.2008.07.238

DO - 10.1016/j.cardfail.2008.07.238

M3 - Journal article

C2 - 19041049

VL - 14

SP - 850

EP - 855

JO - Journal of Cardiac Failure

JF - Journal of Cardiac Failure

SN - 1071-9164

IS - 10

ER -