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Holter-based QT parameters were measured in 40 matched participants (age 73.03 ?? 4.51, 24 M, 8 F), 20 with SCD (sudden cardiac death) and 20 without SCD who had recordings in the Cardiovascular Health Study. Time to SCD was 6.5??2.8 years. Beat-by-beat QTonset, QTpeak, and QTend times were measured and averaged for one 2-min segment/hr and results compared between cases and controls. QT interval...
To assess the value for improving risk stratification of measures, unadjusted and adjusted for heart rate, of heart rate variability (HRV) and heart rate turbulence (HRT) based on 2- to 24-h ambulatory electrocardiographic recordings; and to relate this to the decision to use an implantable cardiac defibrillator (ICD) and the attendant consequences on effectiveness and cost-effectiveness.Risk stratification...
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