Calculator

Rapid shallow breathing index

New

RR ÷ tidal volume in litres during a spontaneous breathing trial.

/min
mL

RSBI

71 breaths/min/L

Favourable for weaning (< 105)

Favourable for weaning (< 105)
Weaning failure more likely (≥ 105)

Formula

rr / (vt / 1000)

References

  1. Yang KL, Tobin MJ. A prospective study of indexes predicting the outcome of trials of weaning from mechanical ventilation. N Engl J Med 1991;324:1445-50.

Used in

Liberation: daily SAT and SBT

Calculators support, not replace, clinical judgement. Check inputs and units, and confirm doses with your unit protocol.