NCT05775562

Early Pulmonary Effects of Excursion Deep Diving with Closed-circuit Gas Recycling: SPIDD Study

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 20 (actual)
• Sponsor: University Hospital, Brest · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

Summary

Scuba diving with closed circuit gas rebreathers is currently booming. Initially developed for professional and military diving, this type of diving has become very successful in recreational activities. The possibilities offered by this equipment are immense and reduce the constraints of exploration time and depth. More and more divers are seeking to reach depths previously considered unusual or inaccessible in recreational diving, beyond 100 meters. By pushing back these limits, the diver is exposed to new risks which should lead to a reflection on the means of prevention and treatment in case of incident. The physiological repercussions of these deep dives are not well known. During daily deep excursions in the 90-120 meter zone, there is a significant reduction in vital capacity on leaving the dive, which persists and worsens the following day. It seems necessary to confirm the importance of this impairment, never documented before, and to explore its mechanisms. A better knowledge of this respiratory impact could allow to improve the prevention and the preliminary evaluation of the medical aptitude of these divers.

Conditions

• Physiopathology

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Pre and post dive examinations	Performing pre-dive examinations: \- EFR by plethysmography cabin Realization of the examinations the day of the dive: * Portable Spirometry * Pulmonary ultrasound * Cardiac ultrasound * Measurement of circulating bubbles * ECG * Venous blood sampling (biological collection) * Water balance (Δweight/water intake) * EFR by plethysmography cabin * Weight measurement Realization of the examinations the day after the dive: * Venous blood sample (biological collection) * Portable Spirometry * Pulmonary ultrasound * Cardiac ultrasound * Weight measurement

Timeline

• Start date: 2023-09-19
• Primary completion: 2024-09-06
• Completion: 2024-09-06
• First posted: 2023-03-20
• Last updated: 2024-12-16

Locations

1 site across 1 country: France