Abstract
We appreciate the letter from Gnechi-Ruscone and Guazzi regarding our article. 1 We certainly agree with their suggestion of the need for a more detailed evaluation of sudden cardiac death risk related to an increase in QRS duration ranging from 110 to 120 ms. The study by Aro et al1 indeed demonstrated that intraventricular conduction delay was associated with excess mortality risk, including sudden arrhythmic death. In that study, using visual measurements of QRS duration, the threshold of 110 ms rather than the …
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