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Specificity of Dyspnoea Relief With Inhaled Furosemide (FurosAH)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT02881866
Recruitment Status : Completed
First Posted : August 29, 2016
Last Update Posted : August 29, 2016
Information provided by (Responsible Party):
Joanna Grogono, Oxford Brookes University

Brief Summary:
This study evaluates the effect of inhaled furosemide on different types of breathlessness relief in healthy volunteers. Each volunteer inhaled mists of either furosemide or a control substance on 3 occasions per day on 2 separate days. On one day they performed one breathlessness test which creates an 'urge to breathe' known as air hunger (AH) and the other day they performed a breathlessness test which increases the sense of work/effort (WE) of breathing. The study is double blinded so neither the volunteer or the research knows which mist is being inhaled.

Condition or disease Intervention/treatment Phase
Dyspnea Drug: Furosemide Drug: Saline Phase 1

Detailed Description:

This is a double-blind, placebo-controlled trial. 16 healthy volunteers will attend 4 sessions. After 2 practice sessions subjects will undergo 2 test days where they will be made to feel 'air hunger' (hypercapnia with constrained ventilation) before and after mist inhalations on one day and sense of breathing 'effort' (raised ventilation with external resistive load) before and after mist inhalations on the second test day. The mist will either be furosemide or a placebo (saline) mist.

The urge to urinate from systemic absorption from the lungs will be accounted for by a concomitant administration of intravenous furosemide when saline is inhaled.

Furosemide is a prescription drug which makes kidneys produce more urine. When administered by inhalation as an aerosol it has direct action in the lungs which sensitises slowly adapting stretch receptors which is believed to account for the relief of dyspnoea previously reported with inhaled furosemide.

Vagal afferents from the pulmonary stretch receptors are known to be involved in relief of air hunger but it is not known if they will also relieve the sense of breathing effort. Relief of breathlessness will be measured and compared between the two trial days to see if furosemide specifically relieves the 'air hunger' type of breathlessness and not the 'effort' type of breathlessness.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 16 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: Specificity of Dyspnoea Relief With Inhaled Furosemide
Study Start Date : October 2015
Actual Primary Completion Date : March 2016
Actual Study Completion Date : March 2016

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Air Hunger

Previous studies have shown that inhaled furosemide relieves 'air hunger'.

Each volunteer has 3 mists per visit. The mists are either in the order of Furosemide-Saline-Furosemide or Saline-Furosemide-Saline. The furosemide mist is 40mg (10mg/ml) nebulised and the saline mist is 4ml nebulised.

Induced air hunger (hypercapnia with constrained ventilation) is the active comparator and will be the type of breathlessness induced, before and after each mist inhalation on one day. .

Drug: Furosemide
Other Name: Lasix

Drug: Saline
Other Name: 0.9% sodium chloride

Experimental: Work Effort
Induced sense of breathing effort (raised ventilation with external resistive load) is the 'experimental arm' and will be the type of breathlessness induced, before and after each mist inhalation on the other day. .
Drug: Furosemide
Other Name: Lasix

Drug: Saline
Other Name: 0.9% sodium chloride

Primary Outcome Measures :
  1. Visual analogue scale for breathlessness type [ Time Frame: 20minutes ]
    The visual analogue scale (VAS) is from 0 (no breathlessness) to 100 (maximal breathlessness willing to tolerate). The VAS is measure every 15-20 seconds during each experimentally induced breathing test. Each breathing test is performed before and after each mist inhalation. Total of 6 breathing tests. The final minute of a 4 minute steady state breathing test is analysed.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

- Healthy individuals

Exclusion Criteria:

  • On any medication, including herbal medication (other than mild analgesics, vitamins and mineral supplements or, for females, oral contraceptives), whether prescribed or over-the-counter, in the two weeks prior to test sessions involving administration of furosemide or saline.
  • Female participants who are pregnant, lactating or planning pregnancy over the course of trial
  • A medical history of heart, kidney or liver disease/electrolyte disturbances/ immunosuppression/frequent fainting episodes/COPD/nasal polyps/Addison's/acute porphyria/significant prostatic symptoms/acute gout attack/life expectancy <6months or history of allergic reaction to furosemide and/or any of the other ingredients of furosemide or amiloride, sulfonamides or sulphonamide derivatives, such as sulfadiazine or co-trimoxazole
  • Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant's ability to participate in the trial.
  • Have participated in another research trial involving an investigational product in the past 4 weeks.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02881866

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United Kingdom
Oxford Brookes University
Oxford, Oxfordshire, United Kingdom, OX3 0BP
Sponsors and Collaborators
Oxford Brookes University
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Principal Investigator: Joanna C Grogono, MBBS Oxford Brookes University
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
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Responsible Party: Joanna Grogono, Clinical Research Fellow, Oxford Brookes University
ClinicalTrials.gov Identifier: NCT02881866    
Other Study ID Numbers: UREC150939
First Posted: August 29, 2016    Key Record Dates
Last Update Posted: August 29, 2016
Last Verified: August 2016
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Joanna Grogono, Oxford Brookes University:
Air hunger
Resistive load
Additional relevant MeSH terms:
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Respiration Disorders
Respiratory Tract Diseases
Signs and Symptoms, Respiratory
Natriuretic Agents
Physiological Effects of Drugs
Sodium Potassium Chloride Symporter Inhibitors
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action