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Ultrasound assessment of severe dehydration in children with diarrhea and vomiting
Adam C Levine1, Sachita P Shah, Irenee Umulisa
1Department of Emergency Medicine, Brown University Alpert Medical School, Providence, RI, USA. adam_levine@brown.edu
Insights
Ultrasound measurement of the aorta to inferior vena cava ratio is a sensitive tool for diagnosing severe dehydration in children with diarrhea. This ultrasound (US) method shows promise for guiding clinical management in resource-limited settings.
Area of Science:
- Pediatric Emergency Medicine
- Diagnostic Imaging
- Global Health
Background:
- Severe dehydration in children is a significant cause of morbidity and mortality, particularly in resource-limited settings.
- Accurate and timely diagnosis is crucial for effective fluid resuscitation and management.
- Current diagnostic methods, including clinical scales, may have limitations in accuracy.
Purpose of the Study:
- To evaluate the diagnostic accuracy of two ultrasound (US) measures for severe dehydration in children: the aorta to inferior vena cava (IVC) ratio and IVC inspiratory collapse.
- To compare the performance of these US measures against a clinical assessment using the World Health Organization (WHO) dehydration scale.
- To establish the test characteristics (sensitivity, specificity) of each measure against a criterion standard of >10% weight change.
Main Methods:
- A prospective cohort study was conducted with children presenting with diarrhea and/or vomiting in rural Rwandan hospitals.
- Children underwent clinical assessment using the WHO dehydration scale and bedside ultrasound of the IVC.
- Severe dehydration was defined as a >10% weight change from admission to discharge; Receiver Operating Characteristic (ROC) curves were used to analyze test performance.
Main Results:
- The aorta/IVC ratio demonstrated statistically significant diagnostic performance, with an area under the ROC curve different from the reference line.
- At its optimal cut-point, the aorta/IVC ratio achieved 93% sensitivity and 59% specificity.
- Ultrasound assessment of the aorta/IVC ratio outperformed both IVC inspiratory collapse (93% sensitivity, 35% specificity) and the WHO scale (73% sensitivity, 43% specificity).
Conclusions:
- Ultrasound assessment of the aorta/IVC ratio is a valuable tool for identifying severe dehydration in children with acute diarrhea.
- This US measure shows potential for improving the accuracy of diagnosis and guiding clinical management decisions, especially in settings with limited resources.
- Further research may explore the integration of this US technique into routine pediatric care for dehydration assessment.
Objectives:
The objective of this study was to determine the test characteristics for two different ultrasound (US) measures of severe dehydration in children (aorta to inferior vena cava [IVC] ratio and IVC inspiratory collapse) and one clinical measure of severe dehydration (the World Health Organization [WHO] dehydration scale).
Methods:
The authors enrolled a prospective cohort of children presenting with diarrhea and/or vomiting to three rural Rwandan hospitals. Children were assessed clinically using the WHO scale and then underwent US of the IVC by a second clinician. All children were weighed on admission and then fluid-resuscitated according to standard hospital protocols. A percent weight change between admission and discharge of greater than 10% was considered the criterion standard for severe dehydration. Receiver operating characteristic (ROC) curves were created for each of the three tests of severe dehydration compared to the criterion standard.
Results:
Children ranged in age from 1 month to 10 years; 29% of the children had severe dehydration according to the criterion standard. Of the three different measures of dehydration tested, only US assessment of the aorta/IVC ratio had an area under the ROC curve statistically different from the reference line. At its best cut-point, the aorta/IVC ratio had a sensitivity of 93% and specificity of 59%, compared with 93% and 35% for IVC inspiratory collapse and 73% and 43% for the WHO scale.
Conclusions:
Ultrasound of the aorta/IVC ratio can be used to identify severe dehydration in children presenting with acute diarrhea and may be helpful in guiding clinical management.
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