Pulmonology
Rapid Shallow Breathing Index (RSBI)
Predicts the success of weaning from mechanical ventilation.
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Parameters
Rapid Shallow Breathing Index (RSBI) Result
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Formula
RSBI = Respiratory Rate (breaths/min) / Tidal Volume (Liters)Clinical Pearls
Provides a simple, bedside objective measurement to help decide if a patient is ready to be liberated from the ventilator.
Limitations
Must be measured during spontaneous breathing (e.g., on T-piece or CPAP with zero pressure support) to be accurate. Less accurate in prolonged mechanical ventilation (>8 days).