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

Reference Values for Non-invasive Hydration Status Markers

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).

Study Overview

• Status: Completed
• Conditions: 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).

• Study Type: Observational
• Enrollment (Actual): 62

Contacts and Locations

Study Locations

• United States
  • Massachusetts
    • Natick, Massachusetts, United States, 01760-5007
      • US Army Research Institute of Environmental medicine Thermal and Mountain Meidicine Division

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• 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.

Description

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

Study Plan

How is the study designed?

Collaborators and Investigators

• Sponsor: U.S. Army Medical Research and Development Command
• Investigators: Principal Investigator: Samuel Cheuvront, Ph.D., US Army Insititute of Environmental Medicine Thermal & Mountain Medicine Div.

Study record dates

Study Major Dates

• Study Start: June 1, 2011
• Primary Completion (Actual): March 1, 2013
• Study Completion (Actual): September 1, 2013

Study Registration Dates

• First Submitted: June 30, 2011
• First Submitted That Met QC Criteria: June 30, 2011
• First Posted (Estimate): July 4, 2011

Study Record Updates

• Last Update Posted (Actual): August 6, 2019
• Last Update Submitted That Met QC Criteria: August 3, 2019
• Last Verified: August 1, 2019

More Information

Terms related to this study

• Keywords: Reference Values
• Other Study ID Numbers: S-11-15