RSBI
Also written as: RSBI — Rapid Shallow Breathing Index
Rapid shallow breathing index; a weaning parameter calculated by dividing respiratory frequency by tidal volume.
Full Definition
The rapid shallow breathing index (RSBI) is a predictive tool used to assess readiness for extubation and weaning success. Calculated as respiratory rate divided by tidal volume (f/VT), it measures the tendency toward rapid, shallow breathing during spontaneous breathing trials. An RSBI less than 105 breaths/min/L is generally considered predictive of successful weaning, while values above 105 suggest continued ventilator dependence. The measurement is typically obtained during a spontaneous breathing trial using minimal or no pressure support to accurately assess the patient's intrinsic breathing pattern.
Usage
Usage note: Always express with units (breaths/min/L) in clinical documentation.
In Context
- "The patient's RSBI of 95 indicated successful weaning potential." — Spontaneous breathing trial assessment
- "An RSBI greater than 105 suggests the patient may not tolerate extubation." — Weaning protocol guideline