Personalized automatic management of tracheal cuff pressure and subglottic secretions drainage to prevent pneumonia in critically ill intubated patients. The MICROINHALO multicenter randomized controlled trial.

Summary

In a multicenter cluster-RCT, automated cuff-pressure control plus continuous subglottic secretion drainage did not reduce day-3 tracheal colonization versus manual care but significantly lowered both clinically diagnosed and microbiologically confirmed VAP. The intervention also maintained cuff pressures within target more consistently and increased secretion drainage volumes.

Key Findings

• Day-3 tracheal colonization: 37% (automatic) vs 41.5% (manual); absolute difference -4% (95% CI -16 to 8), P=0.52.
• Clinically diagnosed VAP: 12.6% vs 24.4% (P=0.016); microbiologically confirmed VAP: 10.2% vs 19.5% (P=0.039).
• Cuff pressure outside safety range: 10.2% vs 24.4% (P<0.001); median daily SSD volume: 25 mL vs 10.5 mL (P<0.001).

Clinical Implications

Institutions may consider automated cuff-pressure and continuous subglottic secretion drainage systems to lower VAP risk, while awaiting confirmatory trials and cost-effectiveness analyses.

Limitations

• Open-label design may introduce performance bias
• Primary endpoint (tracheal colonization) was neutral; mechanism of VAP reduction requires confirmation

Future Directions

Confirm VAP reduction in larger blinded or pragmatic trials; assess cost-effectiveness, safety, and generalizability across ICU settings; explore optimal control algorithms.