Respiratory variables recorded during the first night (basal) and second night (after oxygen administration) in excessive erythrocytosis EE and controls
| Basal EE | After oxygen EE | Basal controls | After oxygen controls | p‐value# | p‐value¶ | |
| Awake VE L·min−1 | 12.9±0.5 | 12.0±0.5 | ns | |||
| Awake ETCO2 mmHg | 39.9±1.0 | 38.3±0.9 | ns | |||
| Awake Sa,O2 % | 83.7±0.3 | 96.6±0.4+ | 85.6±0.4 | 97.1±0.5+ | <0.01 | <0.01 |
| Mean sleep Sa,O2 % | 80.0±0.8*** | 80.3±0.6 | 82.8±0.5*** | 83.6±0.6 | <0.05 | ns |
| Lowest NREM Sa,O2 % | 69.3±2.7 | 68.3±4.1 | 74.8±1.0 | 74.7±2.1 | ns | ns |
| Lowest REM Sa,O2 % | 71±2.9 | 71.8±1.3 | 78.5±1.2 | 78.8±1.3 | ns | ns |
| AHI | 10.0±4.5 | 13.2±7.0 | 8.7±2.7 | 7.0±2.0 | ns | ns |
| Mean duration of the apnoea /hypopnea s | 24.2±1.5 | 19.5±1.7 | 20.3±1.4 | 20.8±0.9 | ns | ns |
| ΔSa,O2 % | 5.4±0.6 | 4.5±0.6 | 4.6±0.2 | 5.0±0.2 | ns | ns |
Data are presented as mean±sem unless otherwise stated
V'E: minute ventilation
ETCO2: end-tidal carbon dioxide
Sa,O2: arterial oxygen satruration
REM: rapid eye movement
NREM: non‐REM
AHI: apnoea/hypopnoea index
#: EE versus controls
¶: basal control versus after oxygen control
+: Sa,O2 during oxygen administration
ns: nonsignificant
***: p<0.001 versus awake Sa,O2