Ventilator Weaning Readiness Checklist
A structured clinical checklist and reference guide for assessing weaning readiness, conducting spontaneous breathing trials, calculating RSBI, and managing post-extubation care.
Written for respiratory therapists, students, and clinicians.
Why Weaning Matters
Mechanical ventilation is a life-sustaining intervention, but prolonged ventilation carries significant risks: ventilator-associated pneumonia (VAP), diaphragmatic atrophy, tracheal injury, barotrauma, and ICU complications. Timely liberation from mechanical ventilation reduces morbidity, mortality, and ICU length of stay.
Studies consistently show that premature extubation leads to re-intubation (which carries up to 6–12 times higher mortality than planned extubation), while delayed extubation prolongs all ventilator-associated risks unnecessarily. The RT's systematic daily assessment of weaning readiness is one of the most impactful clinical roles in the ICU.
A structured, protocol-driven approach to weaning — combining daily screening criteria with spontaneous breathing trials — is the evidence-based standard of care for ventilator liberation.
Weaning Readiness Screening Criteria
Before initiating a spontaneous breathing trial (SBT), the following daily screening criteria should be assessed. The patient should pass all applicable criteria:
Reason for Ventilation
The condition requiring intubation is resolved or significantly improved
Oxygenation
PaO₂/FiO₂ ratio ≥ 150–200; SpO₂ ≥ 90% on FiO₂ ≤ 0.40–0.50; PEEP ≤ 5–8 cmH₂O
Hemodynamics
No vasopressors or low-dose vasopressors only (e.g., dopamine ≤ 5 mcg/kg/min); no new onset arrhythmias; HR 60–120 bpm; SBP 90–160 mmHg
Neurological
Patient awake, follows simple commands; GCS ≥ 8–10; minimal sedation (RASS 0 to -1)
Ventilatory Drive
Adequate respiratory effort; able to trigger ventilator; RR ≤ 35 breaths/min on current settings
Secretion Management
Able to cough effectively or can be managed with suctioning; secretion burden manageable
No Active Contraindications
No uncontrolled infection, no new major hemodynamic changes, no unsafe airway anatomy, no plans for immediate surgery
Spontaneous Breathing Trial (SBT) Protocols
An SBT is the most important predictor of successful extubation. It tests whether the patient can breathe adequately without ventilatory support. Three main SBT methods are used:
T-Piece Trial
Disconnect the patient from the ventilator and provide humidified oxygen via T-piece connected to the ETT. The patient breathes entirely on their own with no ventilator support.
Duration: 30–120 minutes
Notes: Most demanding; tests true unsupported breathing; higher false-positive success rate for extubation failure in some studies
Low-Level CPAP (5 cmH₂O)
Patient breathes on CPAP mode with 5 cmH₂O PEEP and zero pressure support. The ventilator provides PEEP only, no inspiratory assistance.
Duration: 30–120 minutes
Notes: Maintains patency, slightly overcomes ETT resistance; preferred in many ICU protocols; similar outcomes to T-piece in most studies
Low-Level Pressure Support (5–8 cmH₂O) + PEEP 5
Minimal PS (5–8 cmH₂O) overcomes ETT resistance, simulating post-extubation conditions more closely. PEEP 5 cmH₂O maintained.
Duration: 30–120 minutes
Notes: Most commonly used; considered the most physiologically representative of actual post-extubation workload; guideline-supported
SBT Failure Criteria
Stop the SBT and return to full ventilatory support immediately if any of the following occur:
SpO₂ < 88–90% on FiO₂ ≤ 0.50
RR > 35 breaths/min or < 8 breaths/min
HR > 140 bpm or change > 20% from baseline
SBP > 180 or < 90 mmHg
Accessory muscle use, paradoxical breathing, diaphoresis
Increasing anxiety or altered mental status
Elevated PaCO₂ or pH < 7.32 on ABG
Patient demands to stop or is clearly distressed
RSBI: Rapid Shallow Breathing Index
The Rapid Shallow Breathing Index (RSBI) is a simple, validated predictor of SBT outcome and extubation success, described by Yang and Tobin in 1991.
RSBI = RR ÷ Tidal Volume (L)
Measure during 1 minute of T-piece or minimal support breathing
RSBI < 80
High likelihood of successful extubation
RSBI 80–105
Intermediate range — consider full SBT result; individualize decision
RSBI > 105
High likelihood of weaning failure — postpone SBT, address cause
RSBI alone is insufficient for extubation decisions — always integrate full clinical picture including mental status, cough strength, secretions, and the full SBT result.
Extubation Criteria and Post-Extubation Care
Pre-Extubation Assessment
- • SBT passed without failure criteria
- • Adequate cough and ability to clear secretions
- • Airway patency assessment — consider cuff-leak test in patients ventilated >48h or suspected subglottic edema
- • Mental status adequate to protect airway
- • Physician order for extubation obtained
Post-Extubation Monitoring and Support
- • Monitor SpO₂, RR, HR, and work of breathing for at least 1–2 hours post-extubation
- • Provide supplemental oxygen (nasal cannula or face mask) as needed
- • High-risk patients: prophylactic HFNC or NIV reduces re-intubation risk
- • Watch for stridor — consider racemic epinephrine or heliox; re-intubate if not responsive
- • Encourage incentive spirometry, early mobilization, and deep breathing exercises
Frequently Asked Questions
How often should weaning readiness be assessed?
Best practice supported by evidence-based protocols recommends daily screening of all mechanically ventilated patients for weaning readiness. Spontaneous awakening trials (SAT) should be performed in coordination with SBTs using a paired approach (SAT + SBT), which has been shown to reduce ventilator days, ICU LOS, and 1-year mortality.
What is the cuff-leak test and when is it used?
The cuff-leak test checks for upper airway edema that may cause post-extubation stridor. With the patient on ACMV, deflate the cuff and measure the difference between delivered and exhaled tidal volumes over 6 breaths. A leak <110 mL or <10–12% of delivered Vt suggests significant subglottic edema. Consider IV corticosteroids (e.g., methylprednisolone 20 mg IV q4h starting 12h before extubation) in patients who fail the cuff-leak test but are otherwise ready for extubation.
Should I use HFNC prophylactically after extubation?
Evidence supports prophylactic HFNC post-extubation in high-risk patients: those intubated for ≥24h, hypercapnic risk, obesity, COPD, heart failure, or significant secretion burden. HFNC reduces post-extubation respiratory failure and re-intubation rates better than standard oxygen therapy in this population.
What should I do if the patient fails the SBT?
Return to comfortable ventilatory support immediately. Investigate the cause of SBT failure: worsening oxygenation (lung edema, atelectasis?), cardiovascular limitation (heart failure, arrhythmia?), neuromuscular weakness (ICU-acquired weakness?), or excessive secretions. Address the underlying cause before the next SBT attempt the following day.
Summary
- Assess weaning readiness daily using structured screening criteria
- SBT with low PS + PEEP 5 or T-piece is the standard liberation assessment tool
- RSBI < 80 predicts SBT success; RSBI > 105 predicts failure — use alongside full clinical assessment
- Paired SAT + SBT reduces ventilator days and improves outcomes
- Prophylactic HFNC post-extubation reduces re-intubation in high-risk patients
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