A Comparison of Two Nights of Ambulatory Sleep Testing in Arrhythmia Patients
Table 3
A comparison between sleep parameters of first and second night of ambulatory sleep testing.
First night
Second night
Difference between means
ICC (2, 1)
Sleep Onset Latency (min)
30.8 ± 27.85
0.320
Sleep Efficiency (%)
71.91 ± 18.27
72.10 ± 15.84
0.396
Stage 1 (%)
5.28 ± 5.61
5.82 ± 7.68
0.7
0.553
Stage 2 (%)
59.58 ± 14.36
57.53 ± 17.31
0.4
0.599
Stage 3 (%)
11.05 ± 10.68
12.79 ± 12.61
0.2
0.757
Stage 4 (%)
4.47 ± 8.16
3.34 ± 7.05
0.7
0.740
REM (%)
18.13 ± 9.38
17.12 ± 8.91
0.3
0.549
REM Latency (min)
102.32 ± 65.57
92.46 ± 80.90
0.02
0.379
AHI/h
19.55 ± 17
20.26 ± 17.23
0.813
Supine AHI/h
24 ± 26.96
23.29 ± 24.65
0.477
Non-supine AHI/h
15.56 ± 17.80
14.86 ± 18.34
0.627
REM AHI/h
25.67 ± 24.42
23.34 ± 23.54
0.540
NREM-AHI/h
18.18 ± 17
19 ± 17.5
0.781
Minimum Saturation (%)
81 ± 13.3
83.24 ± 8.45
0.325
Average nocturnal heart rate bpm
61.81 ± 12.81
62.26 ± 14.3
0.695
Arousal Index/h
15.41 ± 8.62
14.81 ± 7.90
0.618
PLMS (count)
50.23 ± 96.65
49.82 ± 99.83
0.644
PLMS Index/h
10.20 ± 18.64
9.71 ± 18.47
0.709
Values are expressed as mean ± SD. Nonparametric Wilcoxon signed rank test was used to compare means of groups. indicates significance. AHI: apnea-hypopnea-index; ICC: interclass correlation coefficient; OSA: obstructive sleep apnea; PLMS: periodic limb movements in sleep; REM: rapid eye movement; h: hour; bpm: beat per minute.
