Key result
In patients with chronic heart failure, very-low-frequency heart rate variability values derived from 5 and 10 minute intervals were significantly lower than those from 40 and 20 minutes (P<0.005).
Observational (n=16)
p-value: p=< 0.005
In patients with chronic heart failure, heart rate variability measures have low reproducibility, and recordings of at least 20 minutes are recommended to optimize signal acquisition for very-low-frequency power.
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Short recordings yield lower VLF HRV in chronic HF, warranting interpretive caution; leaves open optimal duration for reproducible measures.
Ponikowski et al. (1996) conducted an observational in chronic heart failure (n=16). ECG recording duration was evaluated on Very-low-frequency power values (p=< 0.005). In patients with chronic heart failure, very-low-frequency heart rate variability values derived from 5 and 10 minute intervals were significantly lower than those from 40 and 20 minutes (P<0.005).
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