Understanding Weaning Outcomes and Ventilation Duration in the PRiVENT Study

By
Huili Cheng
October 26, 2026

Critical Care

Overview

The PRiVENT study found higher observed weaning success with a specialist-led programme than with usual care, but the adjusted primary analysis did not reach statistical significance; a prespecified matched analysis showed a stronger association. The intervention group also had longer ventilation duration, and the nonrandomized design, differing outcome ascertainment, and unresolved mortality and resource-use questions limit interpretation of net clinical effect.

Background

Liberation from invasive ventilation and reducing ventilation duration are related but distinct outcomes. The PRiVENT study evaluated a regional specialist-led programme for patients at high risk of weaning failure, using prospectively recorded intervention outcomes and claims-derived control outcomes. Weaning success was defined by liberation before discharge from the intensive care unit or an affiliated weaning centre, while death and prolonged ventilation were classified as failure under the study definitions. Standardized screening and spontaneous breathing trials are also addressed in clinical guidance, including the 2024 American Association for Respiratory Care guideline.

Data Highlights

Measure	Intervention	Control	Estimate
Patients included	349	1,768	—
Weaning success	201/345 (58.3%); 4 outcomes missing	914/1,768 (51.7%)	Adjusted OR 1.46 (95% CI 0.99–2.17; P=0.057)
Prespecified matched analysis	—	—	Adjusted OR 2.90 (95% CI 1.61–5.24)
Time to successful weaning, competing-risk analysis	—	—	Adjusted subdistribution HR 1.12 (95% CI 0.91–1.38; P=0.30)
Observed ventilation time within 30 days	Median 456 h	Median 342 h	Adjusted difference 81 h (95% CI 49–114)
Transfer to specialist weaning centre	57/349 (16.3%)	0	—
In-hospital mortality	—	—	Adjusted OR 0.93 (95% CI 0.64–1.35)

Key Findings

The regional specialist-led programme was reported as feasible; the intervention analysis included 349 patients and the control group included 1,768.
Weaning success was recorded in 58.3% of intervention patients with available outcomes and 51.7% of controls. The adjusted primary estimate was OR 1.46 (95% CI 0.99–2.17; P=0.057), while the prespecified matched analysis yielded OR 2.90 (95% CI 1.61–5.24).
Both PRiVENT comparisons came from the same nonrandomized study and remain vulnerable to residual confounding; the matched association does not establish a causal treatment effect.
In the competing-risk analysis accounting for death, the adjusted subdistribution hazard ratio for time to successful weaning was 1.12 (95% CI 0.91–1.38; P=0.30), showing no clear difference in cumulative weaning incidence.
Median observed ventilation time within 30 days was 456 hours in the intervention group and 342 hours in controls; the adjusted difference was 81 hours (95% CI 49–114). The source notes that longer observed ventilation does not by itself establish greater patient burden or harm.
Specialist weaning-centre transfers occurred in 16.3% of intervention patients and none of the controls. The source states that this imbalance provides context but does not demonstrate that transfer caused longer ventilation; the in-hospital mortality comparison was inconclusive (adjusted OR 0.93; 95% CI 0.64–1.35).

Clinical Implications

The source advises interpreting weaning success, survival, ventilation duration, and resource use jointly rather than treating any single measure as evidence of net benefit or harm. It identifies consistent outcome ascertainment and a cluster-randomized evaluation as ways to clarify programme effects; the planned economic evaluation is also relevant to weighing specialist input and treatment time.

Conclusion

PRiVENT supports the feasibility of regional specialist-led weaning support and reports associations compatible with potential clinical benefit, but its nonrandomized findings do not establish causality. The balance between weaning outcomes, ventilation duration, survival, and resource requirements remains unresolved.