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Clinical timeline of the episode of care.
| Time | Event |
|---|---|
| 2 months before admission | Intermittent use of analgesic (Qutong tablets) |
| 1 day before admission | Onset of altered consciousness |
| Day 0 | Admission with hypoxemia |
| Day 0 | ABG: MetHb 22.4% |
| Day 0 | First methylene blue administration |
| Day 1 | Second methylene blue administration |
| Day 2 | MetHb decreased to 0.6% |
