Table 2.
Differences in vascular reactivity between the OSA and control groups
| Control Subjects without OSA (n = 34) | Patients with OSA (n = 38) | P Value | |
|---|---|---|---|
| Baseline brachial artery diameter, mm | 3.13 ± 0.63 | 3.49 ± 0.78 | 0.038 |
| % FMD | 8.3 ± 4.1 | 5.7 ± 3.8 | 0.005 |
| % NID | 17.79 ± 7.05 | 18.51 ± 6.73 | 0.66 |
| % Ach | 70.73 (46.03,107.07) | 59.77 (38.21,86.19) | 0.19 |
| % SNp | 65.75 (45.46, 88.03) | 57.14 (27.24,78.14) | 0.27 |
| AIx | 20.4 ± 10.1 | 16.2 ± 11.4 | 0.1 |
For normally distributed data, mean ± SD are shown; for nonparametric distributed data, medians (25th, 75th percentiles) are represented.
OSA refers to obstructive sleep apnea; %FMD, percentage change in brachial artery diameter after flow-mediated dilation; %NID, percentage change in brachial artery diameter after nitroglycerin-induced dilation; %Ach, percentage change in laser Doppler flowmetry of the skin microcirculation after iontophoresis of acetylcholine; %SNp, percentage change in laser Doppler flowmetry of the skin microcirculation after iontophoresis of sodium nitroprusside; AIx, augmentation index.