The Index of Rapid Shallow Breathing (aka Rapid Shallow Breathing Index or RSBI) can be used to evaluate a mechanical ventilated patient prior to extubation.
(1) respiratory rate in the number of breaths per minute
(2) tidal volume (VT) in liters
= (number of breaths per minute) / (tidal volume in liters)
• Yang et al found that an index <= 105 breaths per minute per liter was seen in those who were successfully weaned while > 105 indicated weaning failure.
• Frutos-Vivar et al correlated the index with the rate of reintubation.
RSBI in breaths per minute per liter
Rate of Reintubation
25 - 50
50 - 75
from Figure 1, page 1667, Frutos-Vivar
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