NCT07280611

The Hering-Breuer Reflex in Bilateral Lung Transplant Patients

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 22 (estimated)
• Sponsor: Policlinico Hospital · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

The goal of this clinical trial (non-pharmacologic, single-center) is to determine whether the Hering-Breuer inflation reflex is preserved-and how it is modulated by end-expiratory pressure-in adult intensive-care patients who have undergone bilateral lung transplantation. The study will enroll men and women ≥ 18 years admitted to the ICU during the early weaning phase and will include a comparison group of intubated ICU patients after major non-thoracic surgery. The main questions it aims to answer are: * Is the Hering-Breuer reflex (measured as the ratio THBR/TSPONT) absent or attenuated in double-lung-transplant recipients? * Does changing the level of positive end-expiratory pressure (PEEP 8 vs 12 cmH₂O) influence the reflex? Comparison group: Researchers will compare the transplant arm (post-bilateral lung transplantation) with the control arm (post-operative, non-thoracic surgery patients) to see whether loss or blunting of the reflex-and its response to PEEP-differs between the two cohorts. Participants will: * Have a nasogastric catheter with embedded electrodes positioned to record the electrical activity of the diaphragm (EAdi). * Be ventilated in pressure-support mode at two preset PEEP levels (8 cmH₂O and 12 cmH₂O) during the weaning phase. * Receive one standardized high-volume insufflation at \~30 cmH₂O in each PEEP condition to elicit the reflex, while EAdi, airway pressures, inspiratory/expiratory times, and tidal volumes are recorded for 10 minutes per level.

Conditions

• Hering-Breuer Reflex

Interventions

Type	Name	Description
DEVICE	Nasogastric tube placement and elicitation of Hering-Breuer reflex	Enrolled patients will have a nasogastric tube placed, through which diaphragmatic electrical activity will be measured. Patients will be ventilated in pressure support mode with an expansion breath delivered at a maximum pressure of approximately 30 cmH2O in order to elicit the Hering-Breuer Reflex. Diaphragmatic electrical activity, timing, volumes and pressures will then be analyzed before and after the expansion breath over a 10 minute period, testing two levels of PEEP (8 and 12 cmH2O).

Timeline

• Start date: 2025-10-07
• Primary completion: 2026-01-01
• Completion: 2026-06-01
• First posted: 2025-12-12
• Last updated: 2025-12-12

Locations

1 site across 1 country: Italy