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Sweat Evaporimeter Measurement

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. Identifier: NCT01708655
Recruitment Status : Completed
First Posted : October 17, 2012
Last Update Posted : December 3, 2014
Cystic Fibrosis Foundation
Information provided by (Responsible Party):
University of Colorado, Denver

Brief Summary:

The investigators hypothesize that measurement of beta adrenergic induced sweat rate using an evaporimeter can accurately and reliably determine different levels of CFTR dysfunction within a spectrum of patients expressing various degrees of cystic fibrosis disease.

The investigators overall goal is to determine whether the evaporimeter technique of measuring beta-adrenergic induced sweat rate is capable of accurately and reliably identifying different levels of CFTR dysfunction, as a prerequisite before advancing this technique as biomarker assay into clinical trials.

Condition or disease Intervention/treatment Phase
Cystic Fibrosis Other: Sweat Evaporimeter measurement Not Applicable

Detailed Description:
Preliminary data show that following β-adrenergic stimulation, evaporimetry can reliably measure sweat secretion that is: highly reproducible in healthy controls; reduced by 50% in CF obligate heterozygotes; and absent in CF patients carrying severe mutations on both alleles. Further, test- retest experiments suggest good intra-individual reliability. All these features satisfy the required criteria for a biomarker assay that is capable of assessing small increments in CFTR function in vivo in clinical trials designed to assess the effectiveness of correctors and potentiators of CFTR channel activity. Therefore, to provide additional evidence of the value of this novel technique the investigators will determine the accuracy and reliability of evaporimetry to measure Beta-adrenergic induced sweating in subjects with a range of CFTR channel activity.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 16 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Evaluation of the Accuracy and Reliability of B-Adrenergic Sweat Secretion Using an Evaporimeter to Assess CFTR Function in Cystic Fibrosis
Study Start Date : December 2011
Actual Primary Completion Date : August 2014
Actual Study Completion Date : December 2014

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Sweat Evaporimeter measurement
  1. 0.1 ml Carbachol, intraocular solution - diluted to 0.1 µg/ml in normal saline- dose 0.01 µg
  2. 0.2 ml Atropine sulphate, injection solution - diluted to 44 µg/ml in normal saline - dose 8.8 µg.
  3. 0.2 ml of the Beta cocktail injection solution diluted to 44 µg/ml atropine, 22 µg/ml isoproterenol and 4.6 mg/ml aminophylline in normal saline - dose:

    • 4.4 µg Isoproterenol hydrochloride, injection solution
    • 0.93 mg Aminophylline injection solution
    • 8.8 µg Atropine, injection solution
Other: Sweat Evaporimeter measurement
  1. The forearm will be cleaned with distilled water. Mineral oil will be applied to the surface of the skin after each injection.
  2. intracutaneous injection of 0.2 ml of atropine
  3. Stimulation and inhibition of sweating in an adjoining "test" area. Assessment of sweat secretion with an evaporimeter for 10 minutes after:

    1. Intracutaneous injection of 0.1 ml carbachol for stimulation of the cholinergic sweat secretion.
    2. intracutaneous injection of 0.2 ml atropine to Inhibit cholinergic sweat secretion
    3. intracutaneous injection of 0.2 ml beta-cocktail (atropine isoproterenol and aminophylline) for stimulation of beta-adrenergic sweat secretion .

The procedure would take about 45 minutes.

Primary Outcome Measures :
  1. Measurement of beta-adrenergic induced sweat rate using an evaporimeter can accurately and reliably determine different levels of CFTR dysfunction within a spectrum of patients expressing various degrees of CF disease. [ Time Frame: Up to 2 hours ]
    The response patterns will be interpreted and classified by the study PI, as consistent or inconsistent to the published standards. The obtained measurements will be compared to the results obtained from a recently finished validation trial. According to the result of this trial the ranges were as followed: cholinergic response for all subjects 60±20 Evaporimeter units, beta-adrenergic response: Healthy control 51 ± 20 heterozygote -22 ±20, CF -1.4 ±2.

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. Male or female ages 18 years and older.
  2. Subject with or without confirmed diagnosis of CF.
  3. Written informed consent obtained from subject.

Exclusion Criteria:

  1. Patients who are participating in clinical trials evaluating the safety, efficacy or clinical outcome of drugs that may alter the CFTR Cl channel function will be excluded.
  2. Any subject with a known hypersensitivity to any agonist used in the study or subjects receiving any drug (e.g. theophylline, antihypertensive agent) that might interfere with the investigations.
  3. Subjects with active dermatitis or other chronic skin condition such as psoriasis or a strong allergic history.
  4. Patients with a history of cardiac disease (including arrhythmias or hypertrophic obstructive cardiomyopathy).
  5. CF patients with severe malnutrition (BMI<18 kg/m2).
  6. CF patients with severe lung disease (FEV1<25%).
  7. Subject who has been treated for pulmonary exacerbation or other acute illness within one week of the study procedure.
  8. Any medical condition that, in the opinion of the investigator, will interfere with accurate conduct of the study.
  9. Subjects who are pregnant or lactating.
  10. Subject who is not able to stop inhalation therapy of β -adrenergic drugs 12 hrs before starting each test.

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 identifier (NCT number): NCT01708655

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United States, Colorado
Children's Hospital Colorado
Aurora, Colorado, United States, 80045
Sponsors and Collaborators
University of Colorado, Denver
Cystic Fibrosis Foundation
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Principal Investigator: Frank J Accurso, MD Children's Hospital Colorado
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Responsible Party: University of Colorado, Denver Identifier: NCT01708655    
Other Study ID Numbers: 11-1463
First Posted: October 17, 2012    Key Record Dates
Last Update Posted: December 3, 2014
Last Verified: December 2014
Keywords provided by University of Colorado, Denver:
Cystic Fibrosis
Sweat Evaporimeter
Additional relevant MeSH terms:
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Cystic Fibrosis
Pathologic Processes
Pancreatic Diseases
Digestive System Diseases
Lung Diseases
Respiratory Tract Diseases
Genetic Diseases, Inborn
Infant, Newborn, Diseases