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Divers with healed ear injuries may face hidden risks at depth

NCT ID NCT07446348

Knowledge-focused Sponsor: University of Plymouth Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
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Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
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Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

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Status unknown
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First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at how nitrogen narcosis (a sleepy, dizzy feeling divers get at depth) affects hand-eye coordination, balance, and eye movements. Researchers will compare 20 healthy divers with 20 divers who previously had an inner ear decompression sickness. Participants perform tasks in a pressure chamber at the surface and at a simulated depth of 40 meters. The goal is to see if past ear injury makes divers more prone to balance problems under narcosis, helping guide safer return-to-diving advice.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 40 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Sep 2029

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Open to all interested participants

Ages

18 to 60 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * 'Healthy/normative' participants with no history of orthopaedic/ neurological disorders that could affect balance or cognition. * Diver participants with a history of inner ear decompression illness, have returned to diving and have had a confirmed negative patent foramen ovale (PFO) screen or closure procedure. Exclusion Criteria: * History of substance abuse * Excessive caffeine intake within 24 hours (1 cup coffee max.) * Alcohol intake within 24 hours * Known PFO * IEDCS diver with residual severe vestibular/ balance symptoms (unable to stand with feet together and eyes closed for 30 seconds)

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Conditions

The condition(s) this trial relates to.

decompression sickness Inert Gas Narcosis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Inner ear decompression illness Nitrogen narcosis

How to take part

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  1. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    Open the record ↗

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