Physiological changes at rest with altitude
| Altitude (m) | Sea level | 3833 | 4450 | 5129 | 8400 |
| SpO2% | 98 | 88 | 86 | 81 | |
| Heart rate (bpm) | 60 | 76 | 82 | 88 | |
| Systolic blood pressure (mm Hg) | 135 | 136 | 134 | 139 | |
| Diastolic blood pressure (mm Hg) | 73 | 84 | 86 | 86 | |
| Respiratory rate (bpm) | 15 | 17 | 17 | 19 | |
| PaO2 (KPa) | 13.3* | 3.28† | |||
| PaCO2 (KPa) | 5.4* | 1.77† |
All values represent mean values at rest (unpublished data DMS 2012).
*Reference normal values.
†From Grocott et al.1