Arrhythmias & electrophysiology
Prediction of Sudden Cardiac Death With Ultra-Short-Term Heart Rate Fluctuations
Authors' conclusion
Ultra-short-term DFA2 α1, when measured at rest, is a powerful and independent predictor of SCD. The association between DFA2 α1 and SCD is modified by physical exertion.
Study context
- Population
- Patients undergoing clinical exercise testing in the prospective FINCAVAS (Finnish Cardiovascular Study)
- Participants
- 2,794 patients83 sudden cardiac death (SCDs)
- Exposure
- Lower vs higher DFA2 α1 for SCD risk
- Outcome
- Incident SCD (AHA/ESC criteria); main exposure DFA2 α1 (short-scale scaling exponent, second-order detrending) from 1-minute ECG samples
- Follow-up
- Median 8.3 years (Q1-Q3: 6.4-10.5)
Main finding
As reported in the abstract
SCD per 1-SD lower DFA2 α1 at rest · median follow-up 8.3 years
- Risk of SCD per 1-SD lower resting DFA2 α1 (Q1-Q3: 2.0-3.0)
- 2.4-fold
- P value
- P < 0.001
Observational data: associations, not effects.
Further findings
Conventional heart rate variability (HRV) parameters (any stage of exercise or rest) and SCD
- Substantially weaker associations; nonsignificant after adjustment for other risk factors
Original publication
Prediction of Sudden Cardiac Death With Ultra-Short-Term Heart Rate Fluctuations. JACC Clin Electrophysiol. Published 12 June 2024. doi:10.
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