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| Grade | Criteria |
|---|---|
| Grade 1 | Moderate hypoxia (SpO2 <94%) or |
| Hypotension (drop of SBP >20%) | |
| Grade 2 | Severe hypoxia (SpO2 <88%) or |
| Hypotension (drop of SBP >40%) or | |
| Unexpected loss of consciousness | |
| Grade 3 | Cardiovascular collapse requiring CPR |
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