Table 3.
Differences in heart rate variability and Holter data according to the occurrence of atrial fibrillation in patients with hypertension.
| AF occurrence (+) (n = 44) |
No AF occurrence (n = 738) |
P value | |
|---|---|---|---|
| VLF (ms) | 30.3 ± 20.4 | 23.8 ± 12.0 | 0.075 |
| LF (ms) | 20.1 ± 16.3 | 13.9 ± 9.0 | 0.011 |
| HF (ms) | 15.3 ± 7.7 | 10.7 ± 5.9 | < 0.001 |
| LF/HF ratio | 1.23 ± 0.40 | 1.45 ± 3.18 | 0.098 |
| SDNN (ms) | 117.9 ± 72.2 | 108.0 ± 40.1 | 0.848 |
| SDANN (ms) | 98.9 ± 59.3 | 96.1 ± 38.6 | 0.536 |
| ASDNN (ms) | 56.4 ± 33.1 | 43.5 ± 18.8 | 0.021 |
| rMSSD (ms) | 40.4 ± 21.0 | 28.0 ± 13.1 | < 0.001 |
| pNN50 (%) | 15.5 ± 14.2 | 8.0 ± 8.3 | < 0.001 |
| BB50 (beats) | 10,070 ± 7423 | 6810 ± 6400 | < 0.001 |
| Mean heart rate (bpm for 24 h) | 66 (54–77) | 71 (64–80) | 0.002 |
| Premature atrial contractions (beats for 24 h) | 512 (55–4561) | 56 (21–311) | < 0.001 |
VFL, very low frequency; LF, low frequency; HF, high frequency; SDNN, standard deviation of the NN interval; SDANN, standard deviation of all 5-min mean NN interval; ASDNN, average standard deviation of all 5-min RR intervals; 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; BB50, the count of intervals that are more than 50 ms different from the previous interval.