A concise tour of spontaneous breathing trials and why they matter for extubation decisions. Short comparisons of T-piece, pressure support plus PEEP, and CPAP highlight how each changes work of breathing. A look at the evidence favoring pressure-supported trials for most patients. Practical scenarios when a T-piece still makes sense and tips on institutional variation and daily screening.
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insights INSIGHT
SBTs Are Post-Extubation Stress Tests
An SBT is a stress test for post-extubation work of breathing, not just a ventilator check.
Balance test sensitivity and specificity to avoid unnecessary failures or unsafe false positives.
volunteer_activism ADVICE
Default To 30-Min PS 5/5 For Most Patients
Use a 30-minute pressure-support SBT (≈5/5) as the default for most stable ICU patients.
This approach increases extubation success and leads to earlier liberation without higher reintubation rates.
insights INSIGHT
Pressure Support Outperforms T-Piece For Success
Meta-analyses (~6,000 patients, >40 RCTs) show pressure-supported SBTs raise extubation success by ~7% versus T-piece.
Importantly, they do this without increasing reintubation rates.
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This week’s Pulm PEEPs Pearls episode is all about spontaneous breathing trials (SBTs). SBTs are a standard part of the daily practice in the intensive care unit, but the exact methods vary across ICUs and institutions. Listen in to hear about the most common methods of SBTs, the physiology of each method, and what the evidence says.
Contributors
This episode was prepared with research by Pulm PEEPs Associate Editor George Doumat.
Dustin Latimer, another Pulm PEEPs Associate Editor, assisted with audio and video editing.
Key Learning Points
What an SBT is really testing
An SBT is a stress test for post-extubation work of breathing, not just a ventilator check.
The goal is to balance sensitivity and specificity:
Too hard → unnecessary failures and delayed extubation
Too easy → false positives and higher risk of reintubation
Common SBT modalities and how they compare
T-piece
No inspiratory support and no PEEP
Highest work of breathing
Most “physiologic” but often too strict
Pressure support (PS) + PEEP (e.g., 5/5 or 8/5)
Offsets ETT resistance and provides modest assistance
Easier to pass than T-piece
CPAP (0/5)
No inspiratory help, but provides PEEP to counter ETT resistance
Sits between PS and T-piece in difficulty
Evidence favors pressure-supported SBTs for most patients
Leads to earlier extubation and fewer ventilator-associated risks
Bottom line: A 30-minute PS 5/5 SBT is evidence-based and appropriate for most stable ICU patients
When a T-piece still makes sense
T-piece SBTs are useful when:
Cost of reintubation is high
Difficult airway
Prior failed extubation
Pretest probability of success is low
Prolonged or difficult weaning
Tracheostomy vs extubation decisions
Need to mimic physiology without positive pressure
In LV dysfunction or pulmonary edema even small amounts PEEP may significantly improve physiology
Some centers use a hybrid approach: PS SBT → short confirmatory T-piece before extubation
CPAP as a middle ground
Rationale:
Allows full patient effort while compensating for ETT resistance
Evidence:
Fewer and smaller trials
Possible modest improvement in extubation success
No clear mortality or LOS benefit
Reasonable option based on patient physiology, institutional protocols, and clinician comfort
No single “perfect” SBT mode
Across PS, T-piece, CPAP, and newer methods (e.g., high-flow via ETT) there are no consistent differences in mortality or length of stay
What matters most:
Daily protocolized screening
Thoughtful bedside clinical judgment
Matching SBT difficulty to patient-specific risk
Institutional variation is normal—and acceptable
Examples:
PS 10/5 in postoperative surgical ICU patients
PS 5/0 as an intermediate difficulty option
Key question clinicians should ask: What does passing or failing this specific SBT tell me about this patient’s likelihood of post-extubation success?
Take-home pearls
SBTs are stress tests of post-extubation physiology.
PS 5/5 for 30 minutes is a strong default for most ICU patients.
T-piece trials are valuable when false positives are costly or physiology demands it.
CPAP is reasonable but supported by less robust data.
Consistency, daily screening, and judgment matter more than the exact mode.
References and Further Reading
Burns KEA, Khan J, Phoophiboon V, Trivedi V, Gomez-Builes JC, Giammarioli B, Lewis K, Chaudhuri D, Desai K, Friedrich JO. Spontaneous Breathing Trial Techniques for Extubating Adults and Children Who Are Critically Ill: A Systematic Review and Meta-Analysis. JAMA Netw Open. 2024 Feb 5;7(2):e2356794. doi: 10.1001/jamanetworkopen.2023.56794. PMID: 38393729; PMCID: PMC10891471.
Burns KEA, Sadeghirad B, Ghadimi M, Khan J, Phoophiboon V, Trivedi V, Gomez Builes C, Giammarioli B, Lewis K, Chaudhuri D, Desai K, Friedrich JO. Comparative effectiveness of alternative spontaneous breathing trial techniques: a systematic review and network meta-analysis of randomized trials. Crit Care. 2024 Jun 8;28(1):194. doi: 10.1186/s13054-024-04958-4. PMID: 38849936; PMCID: PMC11162018.
Subirà C, Hernández G, Vázquez A, Rodríguez-García R, González-Castro A, García C, Rubio O, Ventura L, López A, de la Torre MC, Keough E, Arauzo V, Hermosa C, Sánchez C, Tizón A, Tenza E, Laborda C, Cabañes S, Lacueva V, Del Mar Fernández M, Arnau A, Fernández R. Effect of Pressure Support vs T-Piece Ventilation Strategies During Spontaneous Breathing Trials on Successful Extubation Among Patients Receiving Mechanical Ventilation: A Randomized Clinical Trial. JAMA. 2019 Jun 11;321(22):2175-2182. doi: 10.1001/jama.2019.7234. Erratum in: JAMA. 2019 Aug 20;322(7):696. doi: 10.1001/jama.2019.11119. PMID: 31184740; PMCID: PMC6563557.
Burns KEA, Wong J, Rizvi L, Lafreniere-Roula M, Thorpe K, Devlin JW, Cook DJ, Seely A, Dodek PM, Tanios M, Piraino T, Gouskos A, Kiedrowski KC, Kay P, Mitchell S, Merner GW, Mayette M, D’Aragon F, Lamontagne F, Rochwerg B, Turgeon A, Sia YT, Charbonney E, Aslanian P, Criner GJ, Hyzy RC, Beitler JR, Kassis EB, Kutsogiannis DJ, Meade MO, Liebler J, Iyer-Kumar S, Tsang J, Cirone R, Shanholtz C, Hill NS; Canadian Critical Care Trials Group. Frequency of Screening and Spontaneous Breathing Trial Techniques: A Randomized Clinical Trial. JAMA. 2024 Dec 3;332(21):1808-1821. doi: 10.1001/jama.2024.20631. PMID: 39382222; PMCID: PMC11581551.
Mahul M, Jung B, Galia F, Molinari N, de Jong A, Coisel Y, Vaschetto R, Matecki S, Chanques G, Brochard L, Jaber S. Spontaneous breathing trial and post-extubation work of breathing in morbidly obese critically ill patients. Crit Care. 2016 Oct 27;20(1):346. doi: 10.1186/s13054-016-1457-4. PMID: 27784322; PMCID: PMC5081985.
Yi LJ, Tian X, Chen M, Lei JM, Xiao N, Jiménez-Herrera MF. Comparative Efficacy and Safety of Four Different Spontaneous Breathing Trials for Weaning From Mechanical Ventilation: A Systematic Review and Network Meta-Analysis. Front Med (Lausanne). 2021 Nov 22;8:731196. doi: 10.3389/fmed.2021.731196. PMID: 34881255; PMCID: PMC8647911.
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