🫁 Rapid Shallow Breathing Index (RSBI)
Predict ventilator weaning success with the Rapid Shallow Breathing Index (RSBI).
Rapid Shallow Breathing Index (RSBI)
Respiratory rate (f) (/min)
Tidal volume (Vt) (mL)
When to use
Screen readiness for a spontaneous breathing trial and extubation.
How it works
RSBI = respiratory rate ÷ tidal volume (L). < 105 predicts successful weaning/extubation (~ 80%); < 65 high readiness; > 105 high failure risk.
Key points
- Best measured during unsupported spontaneous breathing or after an SBT.
- More sensitive than specific.
- Reflects only rate/volume — integrate with the overall picture.
References
- Yang KL, Tobin MJ. A prospective study of indexes predicting outcome of trials of weaning. NEJM 1991
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.