rapid shallow breathing index


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Related to rapid shallow breathing index: Negative Inspiratory Force, Spontaneous Breathing Trial

rapid shallow breathing index

Abbreviation: f/TV; RSBI.
The ratio of the respiratory rate (f) and the tidal volume (TV) of a patient treated with mechanical ventilation while breathing on a T-piece (or at minimal levels of positive airway pressure or pressure support). Levels less than 105/min/L indicate that a patient may be able to be weaned successfully from the ventilator and breathe unassisted.
See also: index
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Etiology of extubation failure and the predictive value of the rapid shallow breathing index. Am J Respir Crit Care Med 1995; 152:545-549.
Monitoring of extubated patients: are routine arterial blood gas measurements useful and how long should patients be monitored in the intensive care unit?
The SBT is performed by allowing the patient to breathe with a minimal level of Pressure Support or flow-by while monitoring their Rapid Shallow Breathing Index, Work of Breathing and hemodynamic parameters.
Bedside assessment of the mechanically ventilated patient I
While a rising f/VT ratio may indicate distress if VE falls, it may simply reflect an exerciselike response if VE rises in parallel with the rapid shallow breathing index. If VE is relatively high but has shown a wide range of variation in the preceding 24 hour period, the cause may relate more to psychological than to physiological factors, in other words, the patient is likely to have good ventilatory reserve.
Minute ventilation--the neglected parameter

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