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Search strategy applied in MEDLINE database.
| Number | Search terms |
| 1 | acute mountain sickness |
| 2 | acute mountain illness |
| 3 | acute mountain headache |
| 4 | altitude headache |
| 5 | altitude sickness |
| 6 | high altitude cerebral edema |
| 7 | high altitude pulmonary edema |
| 8 | encephaledema |
| 9 | pneumonedema |
| 10 | or 1–9 |
| 11 | ibuprofen |
| 12 | randomized controlled trial |
| 13 | controlled clinical trial |
| 14 | single blind |
| 15 | double blind |
| 16 | clinial trials |
| 17 | RCT |
| 18 | or 12–17 |
| 19 | 10 and 11 and 18 |
