QRS micro-fragmentation as a mortality predictor.

This is further supported by our observation (details not shown) that when QRS- μf was used to predict first appropriate ICD shock rather than death in the EU-CERT-ICD data, the univariable prediction was only borderline significant ( P = 0.044, log 2 QRS- μf HR of 1.216 with 95% CI of 1.005–1.472).

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In both models, QRS- μf was found to be an independent highly significant outcome predictor in all three populations.

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