Assesses spontaneous breathing trial (SBT) success or failure for extubation readiness. Trial method: CPAP 5 cmH2O or T-piece for 30–120 minutes. PASS criteria: RR <35/min, SpO2 >90%, HR and RR within 20% of baseline, no use of accessory muscles, no diaphoresis, no agitation or distress. FAIL: any of the above violated. Consider RSBI (RR/Vt) <105 as additional predictor.
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