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Arrhythmia in hemodialysis patients and its relation to sudden death. Sudden death in patients on hemodialysis is believed to be due to arrhythmia, but the evidence for this is surprisingly limited. Five studies involving implantable loop recorders in patients on hemodialysis have now been published, and 4 have shown that bradyarrhythmia rather than tachyarrhythmia are the pre-eminent arrhythmic associations of fatal events. The Monitoring in Dialysis study, reported in this issue, sheds new light on the relationships of arrhythmia to the conventional 3-session weekly hemodialysis cycle.