AI Article Synopsis
- The study examined the prognostic significance of QRS duration in heart failure (HF) and myocardial infarction (MI) patients, revealing inconsistent outcomes previously.
- A large trial involving 3028 patients tested the antiarrhythmic drug dofetilide and measured QRS duration at the start; however, dofetilide did not impact mortality.
- The findings indicated that longer QRS duration correlated with a higher death risk in MI patients, whereas it did not predict mortality in those with HF, highlighting a significant distinction in risk profiles.
Article Abstract
Background/aims: Studies of the prognostic importance of QRS duration in patients with heart failure (HF) have shown conflicting results and few studies have estimated the importance after myocardial infarction (MI).
Methods: The Danish Investigations and Arrhythmia ON Dofetilide (DIAMOND) study randomised 3028 patients to dofetilide (class III antiarrhythmic) or placebo. The study consisted of two almost identical trials conducted simultaneously. One trial included 1518 patients with chronic HF and the other trial 1510 patients with a recent MI. All patients had left ventricular dysfunction. Dofetilide did not influence mortality in either trial. QRS duration was systematically measured at randomisation and was available in 2972 patients.
Results: Over a 10 year observation period 1037 (70%) patients in the MI study and 1324 (87%) in the HF study died. In the MI study, risk of death increased 6% for each 10 ms increase in QRS duration (HR=1.06/10 ms increase in QRS (CI=1.04-1.09), p<0.0001) whereas QRS duration had no influence in the HF study after multivariable adjustment. The difference between HF and MI was significant (p<0.0004 for interaction).
Conclusion: QRS duration predicts death in patients with left ventricular dysfunction who have suffered MI. In patients with HF QRS duration is not predictive of mortality.
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| http://dx.doi.org/10.1016/j.ejheart.2007.04.005 | DOI Listing |
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