Table 4.
CPC and CVHR variables correlation at baseline and after 3 months of PAP use for patients with sleep-disordered breathing.
| PaCO2 | AHI | Min O2 | ODI | T90 | AI | Awake SpO2 | hs-Troponin | |
|---|---|---|---|---|---|---|---|---|
| Baseline | ||||||||
| SQI | −0.09 | −0.68 | 0.195 | −0.09 | −0.19 | −0.01 | −0.11 | 0.15 |
| SAI | 0.15 | 0.64 | −0.12 | 0.01 | 0.23 | −0.17 | 0.001 | −0.04 |
| HFC | −0.19 | −0.73 | 0.26 | −0.18 | −0.26 | 0.26 | −0.001 | −0.04 |
| LFC | 0.08 | 0.69 | −0.23 | 0.15 | 0.24 | −0.01 | 0.11 | −0.16 |
| e-LFCNB | 0.06 | 0.53 | −0.20 | 0.16 | 0.02 | 0.05 | 0.09 | −0.18 |
| Total eLFC | 0.12 | 0.62 | −0.09 | −0.02 | 0.23 | −0.01 | 0.07 | −0.18 |
| CVHR | 0.23 | 0.62 | −0.09 | -0.02 | 0.2 | −0.17 | −0.11 | −0.01 |
| Change between visits | ||||||||
| SQI | −0.35 | 0.17 | −0.12 | 0.08 | 0.22 | −0.33 | −0.17 | |
| SAI | 0.56 | −0.33 | −0.06 | 0.14 | 0.01 | 0.21 | 0.28 | |
| HFC | −0.33 | 0.20 | 0.06 | 0.19 | 0.06 | −0.15 | 0.04 | |
| LFC | 0.21 | −0.04 | −0.25 | −0.12 | 0.02 | 0.07 | 0.29 | |
| e-LFCNB | 0.43 | −0.15 | −0.03 | −0.03 | 0.01 | 0.01 | 0.55 | |
| Total eLFC | 0.35 | −0.16 | −0.19 | −0.05 | 0.03 | 0.01 | 0.21 | |
| CVHR | 0.35 | −0.18 | −0.18 | 0.05 | 0.16 | −0.08 | 0.21 |
Bold values: P < .05. AHI = apnea-hypopnea index, AI = arousal index, CPC = cardiopulmonary coupling, CVHR = cyclic variation of heart rate, eLFC = elevated low-frequency coupling, e-LFCNB = elevated low-frequency coupling narrow band, HFC = high-frequency coupling, hs-troponin = highly sensitive troponin, LFC = low-frequency coupling, Min O2 = minimum oxygen saturation during an overnight sleep study, ODI = oxygen desaturation index, PaCO2 = partial pressure of carbon dioxide, PAP = positive airway pressure, SpO2 = oxygen saturation by pulse oximetry, SAI = sleep apnea indicator, SQI = sleep quality index, T90 = total time with oxygen saturation < 90% during an overnight sleep study.