RSBI Calculator
Rapid Shallow Breathing Index - Assess mechanical ventilation weaning readiness
Medical Disclaimer
This calculator is for educational and informational purposes only. It should not replace professional medical judgment. Always consult qualified healthcare professionals for patient assessment and treatment decisions. This tool cannot replace clinical evaluation and should only be used by trained medical personnel.
Calculate RSBI Score
Number of breaths per minute (normal: 12-20)
Volume of air per breath (normal: 400-800 mL)
RSBI Results
RSBI Interpretation Guide
Note: RSBI is just one parameter in weaning assessment. Clinical judgment and other factors must also be considered.
Example Calculation
Patient on Mechanical Ventilation
Scenario: 65-year-old patient with pneumonia, ready for weaning trial
Respiratory Rate: 22 breaths/min
Tidal Volume: 450 mL
Measurement: During spontaneous breathing trial (ventilator disconnected)
Calculation
RSBI = Respiratory Rate ÷ Tidal Volume (L)
RSBI = 22 ÷ 0.45
RSBI = 48.9
Interpretation: Good prognosis for weaning (< 105)
Clinical Context
Measurement Setup
Temporarily disconnect ventilator while keeping endotracheal tube in place
Spontaneous Breathing
Patient breathes independently for measurement period
Assessment
Use RSBI along with other clinical parameters for weaning decision
Normal Values
Important Notes
RSBI is one of several weaning parameters
Consider patient's overall clinical status
Measure during spontaneous breathing trial
Use with other assessments for best outcomes
Understanding RSBI (Rapid Shallow Breathing Index)
What is RSBI?
The Rapid Shallow Breathing Index (RSBI) is a respiratory parameter used to predict the success of weaning patients from mechanical ventilation. It represents the ratio of respiratory frequency to tidal volume and helps assess a patient's ability to breathe effectively on their own.
Clinical Significance
- •Predicts weaning success from mechanical ventilation
- •Helps prevent premature extubation
- •Reduces ventilator-associated complications
- •Guides clinical decision-making
Formula & Interpretation
RSBI = f / TV
f = respiratory frequency (breaths/min)
TV = tidal volume (liters)
RSBI < 105: Good prognosis for successful weaning
RSBI ≥ 105: Poor prognosis for successful weaning
Rationale: Patients with respiratory failure tend to breathe rapidly and shallowly, resulting in high RSBI values. Effective breathing is characterized by deeper, slower breaths.
Clinical Limitations
- ⚠️RSBI should be used in conjunction with other clinical assessments
- ⚠️Not suitable as the sole criterion for weaning decisions
- ⚠️May not be accurate in all patient populations
- ⚠️Consider patient's overall clinical status and comorbidities