RSBI Mechanical Ventilation Weaning Index Calculator

RSBI Mechanical Ventilation Weaning Index Explanation and Clinical Context The rapid shallow breathing index known as RSBI is defined as the ratio of respiratory frequency to tidal volume in liters. It is calculated as respiratory rate divided by tidal volume in liters during spontaneous breathing conditions. RSBI measures the pattern of breathing and reflects the balance between respiratory drive and the ability of the respiratory muscles to generate effective tidal volume.

A value less than 105 breaths per minute per liter is commonly associated with a higher chance of successful weaning and extubation. A higher value indicates rapid shallow breathing which suggests respiratory muscle fatigue or increased work of breathing. RSBI should not be used alone to determine readiness for extubation.

Clinical judgment assessment of oxygenation mental status airway protection and strength of cough all play essential roles in the decision making process. Reference Yang KL Tobin MJ. A prospective study of indexes predicting the outcome of trials of weaning from mechanical ventilation.

New England Journal of Medicine 1991. Karthika M. Rapid shallow breathing index review.

PubMed Central 2016. Trivedi V et al. The usefulness of the rapid shallow breathing index in predicting successful extubation summary of pooled analysis in Chest 2022.