Sea level | Kathmandu | Phakding | Namche Bazaar | Namche (repeat) | |
Day 1 | Day 3 | Day 5 | Day 14 | ||
Altitude | |||||
Metres | 30 | 1300 | 2600 | 3500 | 3500 |
Feet | 98 | 4265 | 8530 | 11 483 | 11 483 |
Barometric pressure, mm Hg | 760 | 652 | 560 | 503 | 503 |
PiO2, mm Hg | 150 | 127 | 108 | 96 | 96 |
Equivalent FiO2 | 0.21 | 0.18 | 0.15 | 0.13 | 0.13 |
Respiratory rate/minute | 21 (4) | NA | NA | 23 (5) | 22 (5) |
Heart rate/minute | 78 (13) | 86 (12) | 89 (14) | 99 (14) | 98 (14) |
BP, mm Hg systolic/diastolic | 100(8)/61(7) | 96(7)/55(12) | NA | 98(6)/57(16) | NA |
etCO2, mm Hg | 42.5 (2.8) | NA | NA | 35.8 (2.5) | 32.7 (1.8) |
SpO2, % | 98.5 (0.9) | 95.9 (1.05) | 93.2 (2.2) | 88.9 (2.4) | 91.8 (1.5) |
Overnight SpO2, % | 96.8 (0.8) | 94.1 (1.8) | NA | 85.8 (3.3) | NA |
Lake Louise* | |||||
Total score | 1 (0–4) | 1 (0–2) | 1 (0–3) | 0 (0–5) | NA |
Headache | 0 (0–1) | 0 (0–1) | 0 (0–2) | 0 (0–1) | NA |
Gastrointestinal | 0 (0) | 0 (0–1) | 0 (0) | 0 (0–1) | NA |
Sleep quality | 0 (0–1) | 0 (0–1) | 0 (0–1) | 0 (0–1) | NA |
Fatigue | 0 (0–1) | 0 (0–1) | 0 (0–1) | 0 (0–2) | NA |
Dizziness | 0 (0–1) | 0 (0–1) | 0 (0–1) | 0 (0–1) | NA |
Results are expressed as mean (SD) except for *Lake Louise score expressed as median (range). BP, blood pressure (results only presented for seven children due to missing data at 3500 m); etCO2, end-tidal carbon dioxide; FiO2, fractional inspired oxygen; PiO2, partial pressure inspired oxygen; SpO2, peripheral oxygen saturation.