Table 5 Relationship between HRV risk score according to cut–off value and occurrence of atrial fibrillation.

From: Higher heart rate variability as a predictor of atrial fibrillation in patients with hypertension

Variable

HR (95% CI)

P value

HF ≥ 11.1 (ms)

3.084 (1.653–5.753)

 < 0.001

rMSSD ≥ 29.5 (ms)

2.528 (1.378–4.638)

0.003

pNN50 ≥ 7.0 (%)

2.261 (1.223–4.179)

0.009

One or more risk of HRVa

3.261 (1.648–6.452)

0.001

Risk score of HRVb

0 (n = 405)

1.0 (reference)

 

1 (n = 65)

4.249 (1.647–10.963)

0.003

2 (n = 54)

0.688 (0.086–5.173)

0.699

3 (n = 258)

3.597 (1.770–7.310)

 < 0.001

PACs ≥ 145 beats for 24 h

3.788 (2.031–7.068)

 < 0.001

  1. HRV, heart rate variability; HF, high frequency; rMSSD, square root of the mean squared differences of successive NN interval; pNN50, the percentage of RR intervals that are more than 50 ms different from the previous interval; PAC, premature atrial contraction.
  2. aIndicates that at least one of the above mentioned abnormal HRV parameters (HF, rMSSD, and pNN50) were present.
  3. bSum of the above mentioned abnormal HRV parameter (HF, rMSSD, and pNN50).
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