Prevention and Treatment of Immersion Pulmonary Edema

January 25, 2016 updated by: Duke University

Effects of the Dive Reflex on Pulmonary Arterial and Pulmonary Artery Wedge Pressures in Subjects Who Have Experienced Immersion Pulmonary Edema

Immersion pulmonary edema (IPE) is a condition in which fluid fills the lungs during diving or swimming, particularly in cold water. Some individuals appear to be predisposed to developing IPE. DNA samples will be collected and stored, in order to compare the genetic profiles of individuals who have experienced IPE with those who have not. In a few individuals who have experienced IPE, we plan to measure the effects of cold water immersion on the blood pressure, cardiac output and the pressures in the pulmonary artery. These will be compared with similar measurements already obtained from normal individuals.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Immersion pulmonary edema (IPE) is a condition that has sudden onset in swimmers and divers, and is characterized by cough, shortness of breath, decreased blood oxygen levels, and hemoptysis. The purpose of this study is to examine the effects of cold water immersion and the dive reflex on pulmonary arterial pressure and pulmonary capillary wedge pressure in those who have already experienced IPE, as well as explore the possibility of a genetic predisposition. Healthy nonsmoking subjects who have experienced IPE will be recruited for several cold-water immersion experiments and DNA analysis. Their pulmonary arterial and pulmonary arterial wedge pressures will be measured as they undergo immersed rest and exercise trials in thermoneutral and cold water. If the pressures increase with these trials as hypothesized, the effects of sildenafil administration (a pulmonary vasodilator) will be tested during a second trial. Blood will also be drawn for DNA analysis of certain genes with possible relation to IPE. Results of these tests will be compared with those of the general population.

Study Type

Interventional

Enrollment (Actual)

10

Phase

  • Early Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • North Carolina
      • Durham, North Carolina, United States, 27710
        • Duke University Medical Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 55 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • History of immersion pulmonary edema

Exclusion Criteria:

  • Coronary artery disease, cardiomyopathy, heart valve disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Sildenafil
Measurements of pulmonary and systemic pressures during cold water immersion before and after sildenafil 50 mg orally.
Drug: Sildenafil
After measurement of the effect of cold water on cardiac output and pulmonary artery and wedge pressures, a single dose of sildenafil (50 mg) will be given orally, followed by similar hemodynamic measurements.
Other Names:
  • Viagra

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Pulmonary artery pressure during cold water immersion
Time Frame: 1 day
1 day

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Duke University

Collaborators

Divers Alert Network

Investigators

  • Principal Investigator: Richard Moon, MD, Duke University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2008

Primary Completion (Actual)

December 1, 2015

Study Completion (Actual)

December 1, 2015

Study Registration Dates

First Submitted

December 26, 2008

First Submitted That Met QC Criteria

December 29, 2008

First Posted (Estimate)

December 30, 2008

Study Record Updates

Last Update Posted (Estimate)

January 26, 2016

Last Update Submitted That Met QC Criteria

January 25, 2016

Last Verified

January 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Pro00003158

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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