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Reference Values for Non-invasive Hydration Status Markers H10-14

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: NCT01387529
Recruitment Status : Completed
First Posted : July 4, 2011
Last Update Posted : August 6, 2019
Information provided by (Responsible Party):
U.S. Army Medical Research and Development Command

Brief Summary:
The objective of this study is to establish reference values for non-invasive hydration status markers. Although there are no hypotheses associated with this study, the outcome will help advance the development of non-invasive hydration status monitors (described above and in H08-12; A-15208) capable of detecting dehydration from a single, static measure. The outcome that this research effort supports what is recognized by the military community as a high priority medical technology gap (MOM ICD v1.3, 2008).

Condition or disease
Value Orientation

Detailed Description:

Disorders of fluid and electrolyte balance in the U.S. military result in at least 125 hospitalizations, two lost duty days per event, and 9,300 ambulatory hospital visits per year (60% hyponatremia, 40% dehydration) (Carter et al., 2005; DoD, 2008). Diarrhea is a major infectious disease threat which requires aggressive i.v. fluid replacement in 30% of U.S. troops deployed to Iraq or Afghanistan (Brown et al., 2009). It is also important to recognize that the management and outcome of the 662 severe or penetrating traumatic brain injuries (TBI) reported for the military in 2009 (DoD, 2010) may be hindered by dehydration (Clifton et al., 2002). Fluid and electrolyte imbalances also contribute to heat illness (Carter et al., 2005) and can substantially impair combat fighting effectiveness (Dupont, 2003).

The importance of developing a valid assessment measure of human hydration status for clinical and field use is recognized by the military community as a high priority medical technology gap (MOM ICD v1.3, 2008). In far forward locations (levels I-II), orthostatic testing or gross symptoms are most commonly used to estimate hydration status (Manning et al., 2007). However, level I-II methods share symptoms with numerous other maladies and are insensitive until dehydration is severe or becomes debilitating (Levitt et al., 1992; McGee, 1999). Definitive hydration assessment in rear roles of medical care (levels III-V) requires invasive serial blood and/or urine measurements (Feig, 1977; Mange, 1997). Thus, a field-expedient technology that provides an accurate, non-invasive assessment of hydration status would improve medical triage by allowing better fluid-electrolyte management by medics in theatre (point of care), and by medical personnel in the rear levels of care (treatment and return to duty).

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Study Type : Observational
Actual Enrollment : 62 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Reference Values for Non-invasive Hydration Status Markers
Study Start Date : June 2011
Actual Primary Completion Date : March 2013
Actual Study Completion Date : September 2013

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
Sampling Method:   Probability Sample
Study Population
Approximately 150 volunteers (military and civilians) will complete this experiment. A sample size of 120 volunteers is recommended for characterizing a sample reference population and constructing reference intervals (Fraser, 2001). A sample size of 150 will allow for the potential loss of data due to equipment or handling errors, and 'bad' samples resulting from volunteer non-compliance. A subset of as many as 50 volunteers will undergo repeat testing (3 days; ~3 hours) for the purpose of determining within-subject variance.

Inclusion Criteria:

  • male or female subject over the age of 18 years
  • subject in good general health
  • written informed consent for participation in the study
  • report any adverse events?
  • if female of child bearing potential, has the subject confirmed that she is not pregnant
  • if the subject wears contact lenses, is he/she willing to remove them

Exclusion Criteria:

  • Presence of a significant medical condition, which in the opinion of the investigator precludes participation in the study
  • Use of ANY medication other than oral contraceptives

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): NCT01387529

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United States, Massachusetts
US Army Research Institute of Environmental medicine Thermal and Mountain Meidicine Division
Natick, Massachusetts, United States, 01760-5007
Sponsors and Collaborators
U.S. Army Medical Research and Development Command
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Principal Investigator: Samuel Cheuvront, Ph.D. US Army Insititute of Environmental Medicine Thermal & Mountain Medicine Div.
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Responsible Party: U.S. Army Medical Research and Development Command Identifier: NCT01387529    
Other Study ID Numbers: S-11-15
First Posted: July 4, 2011    Key Record Dates
Last Update Posted: August 6, 2019
Last Verified: August 2019
Keywords provided by U.S. Army Medical Research and Development Command:
Reference Values