Is this child dehydrated?
Michael J Steiner1, Darren A DeWalt, Julie S Byerley
1Department of Pediatrics, University of North Carolina School of Medicine, and Robert Wood Johnson Clinical Scholars Program, Chapel Hill 27599-7593, USA.
Insights
Accurate dehydration assessment in children relies on capillary refill time, skin turgor, and respiratory patterns. While these signs improve diagnosis, other tests have limited utility for precise dehydration evaluation.
Area of Science:
- Pediatrics
- Emergency Medicine
- Diagnostic Accuracy
Background:
- Rapid and accurate assessment of dehydration in infants and young children is critical for appropriate treatment and patient disposition.
- Clinical evaluation of dehydration severity guides immediate medical interventions.
Purpose of the Study:
- To systematically review the precision and accuracy of various clinical signs, symptoms, and basic laboratory tests used to evaluate dehydration in pediatric patients.
- To determine the diagnostic utility of individual and combined findings for assessing dehydration in children.
Main Methods:
- A comprehensive literature search of MEDLINE (PubMed), Cochrane Library, and other sources identified 1561 potential articles.
- Twenty-six studies with original data on diagnostic findings for dehydration in children aged 1 month to 5 years were reviewed.
- Thirteen studies meeting stringent criteria for diagnostic accuracy (likelihood ratios) were included in the final analysis.
Main Results:
- Abnormal capillary refill time (Likelihood Ratio [LR], 4.1), skin turgor (LR, 2.5), and respiratory pattern (LR, 2.0) are the most predictive individual signs for 5% dehydration.
- Combinations of clinical examination signs demonstrate significantly higher accuracy in predicting dehydration compared to individual signs.
- Historical patient data and laboratory tests offer only moderate value in the assessment of dehydration severity.
Conclusions:
- Initial clinical assessment for dehydration in young children should prioritize capillary refill time, skin turgor, and respiratory pattern, alongside combinations of other signs.
- The inherent imprecision and inaccuracy of current diagnostic methods limit clinicians' ability to precisely quantify the degree of dehydration.
Context:
The ability to assess the degree of dehydration quickly and accurately in infants and young children often determines patient treatment and disposition.
Objective:
To systematically review the precision and accuracy of symptoms, signs, and basic laboratory tests for evaluating dehydration in infants and children.
Data Sources:
We identified 1561 potential articles by multiple search strategies of the MEDLINE database through PubMed. Searches of bibliographies of retrieved articles, the Cochrane Library, textbooks, and private collections of experts in the field yielded an additional 42 articles.
Study Selection:
Twenty-six of 1603 reviewed studies contained original data on the precision or accuracy of findings for the diagnosis of dehydration in young children (1 month to 5 years).
Data Extraction:
Two of the 3 authors independently reviewed and abstracted data for estimating the likelihood ratios (LRs) of diagnostic tests. We eliminated 13 of the 26 studies because of the lack of an accepted diagnostic standard or other limitation in study design. The other 13 studies were included in the review.
Data Synthesis:
The most useful individual signs for predicting 5% dehydration in children are an abnormal capillary refill time (LR, 4.1; 95% confidence interval [CI], 1.7-9.8), abnormal skin turgor (LR, 2.5; 95% CI, 1.5-4.2), and abnormal respiratory pattern (LR, 2.0; 95% CI, 1.5-2.7). Combinations of examination signs perform markedly better than any individual sign in predicting dehydration. Historical points and laboratory tests have only modest utility for assessing dehydration.
Conclusions:
The initial assessment of dehydration in young children should focus on estimating capillary refill time, skin turgor, and respiratory pattern and using combinations of other signs. The relative imprecision and inaccuracy of available tests limit the ability of clinicians to estimate the exact degree of dehydration.
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