Specialist Weaning Programme Shows Possible Benefit but Inconclusive Trial Signals

A commentary published in Critical Care on 26 October 2026 examines how the results of the PRiVENT study, a specialist-led weaning programme tested across a regional intensive care network, should be interpreted when success, ventilation duration and resource use are considered together. The author, Huili Cheng, argues that liberation from invasive ventilation and a shorter treatment course are related but distinct goals, and that the study’s findings look different depending on which of these outcomes is emphasised.

The intervention analysis set comprised 349 patients, compared with 1,768 controls. Successful weaning was observed in 201 of 345 intervention patients with recorded outcomes, or 58.3 percent, against 914 of 1,768 controls, or 51.7 percent. The adjusted primary odds ratio was 1.46, with a 95 percent confidence interval of 0.99 to 2.17 and a P value of 0.057. That interval includes both no difference and a clinically important benefit, so it does not establish ineffectiveness, but it also does not reach conventional statistical significance. A prespecified matched analysis was more favourable, yielding an adjusted odds ratio of 2.90 with a confidence interval of 1.61 to 5.24. Both analyses come from the same nonrandomized study and remain subject to residual confounding, so the stronger matched association supports the possibility of benefit without establishing a causal treatment effect.

Outcome comparability raises a further technical concern. Intervention outcomes were prospectively documented, whereas control outcomes were reconstructed from insurance claims. The primary outcome was liberation before discharge from the intensive care unit or an affiliated weaning centre, and stays exceeding six months after ventilation began were classified as failure. The main Methods section of the original study classifies death before successful weaning as failure, while Supplementary Appendix S2 lists death before discharge from the index hospitalization as failure. The commentary asks whether death after successful weaning but before discharge from the index hospitalization was classified identically in both cohorts, and how intensive care unit, weaning-centre and index-hospital discharge were aligned. These wording differences do not establish actual misclassification or its direction, but clarification would make the clinical meaning of the comparison more explicit.

A competing-risk analysis of time to successful weaning, adjusted for the competing event of death, produced a subdistribution hazard ratio of 1.12 with a 95 percent confidence interval of 0.91 to 1.38 and a P value of 0.30. This complementary analysis did not establish a clear difference in the cumulative incidence of weaning when death was accounted for, and it should be interpreted separately from ventilation duration, which addresses a different aspect of the treatment course.

Ventilation duration itself pointed the other way. Using observed ventilation hours within 30 days, the median was 456 hours in the intervention cohort versus 342 hours in controls, with a model-based adjusted difference of 81 hours and a confidence interval of 49 to 114. Longer duration was also reported under an alternative definition that assigns ventilation time through day 30 to patients who died earlier. Transfers to specialist weaning centres occurred in 57 of 349 intervention patients, or 16.3 percent, and in none of the controls; this pathway difference provides context but does not show that transfer caused longer ventilation. Longer observed ventilation indicates greater treatment exposure, not necessarily greater patient burden or harm. The in-hospital mortality comparison was inconclusive, with an adjusted odds ratio of 0.93 and a confidence interval of 0.64 to 1.35.

The programme required specialist boards, bedside consultations, education and coordination with weaning centres, and these inputs must be weighed against any clinical gain. A planned economic evaluation will be important for determining whether potential benefit justifies the additional specialist input and treatment time, and the current clinical results alone do not settle that balance. The commentary concludes that PRiVENT supports the feasibility of regional specialist weaning support and suggests potential clinical benefit, consistent with the original authors’ cautious conclusion, and that a cluster-randomized evaluation with consistent outcome ascertainment could clarify whether a higher success proportion or longer ventilation reflects net benefit or harm.

Subject of Research: Interpretation of weaning success, ventilation duration and outcome classification in the PRiVENT specialist weaning study

Article Title: Interpreting weaning success and ventilation duration in PRiVENT

Article References: Cheng, H. (2026). Interpreting weaning success and ventilation duration in PRiVENT. Critical Care, 30(1), Article 547. https://doi.org/10.1186/s13054-026-06420-z

Image Credits: AI Generated

DOI: 10.1186/s13054-026-06420-z

Keywords: PRiVENT, weaning, invasive ventilation, intensive care, odds ratio, competing-risk analysis, ventilation duration, outcome misclassification, weaning centres, cluster-randomized evaluation, Interpreting, success