Key result
Higher 24-hour SDNN linked to ~81% lower mortality risk in post-MI patients.
Design
Review
Authors
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Supports SDNN for post-MI risk stratification; leaves open whether interventions targeting HRV improve outcomes.
Effect estimate: HR 0.19 (95% CI 0.15-0.25)
This review provides a foundational understanding of heart rate variability metrics, emphasizing that 24-hour, short-term, and ultra-short-term normative values are not interchangeable.
Shaffer et al. (2017) conducted a review in Heart Rate Variability (HRV). Higher 24-hour SDNN values reduce the risk of mortality by approximately 81% in heart attack survivors compared to those with lower values.
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