POEMs

Patient-Oriented Evidence That Matters

Clinical Diagnosis of Lyme Disease Frequently Misses the “Bull's Eye”

 

Am Fam Physician. 2018 Apr 1;97(7):474.

Clinical Question

In children, how accurate is the clinical suspicion for Lyme disease in areas of high prevalence?

Bottom Line

For children with suspected Lyme disease but without a classic bull's-eye lesion (erythema migrans of at least 5 cm), check serology rather than rely on your clinical impression. In this study, 12% of the children not suspected of having Lyme disease did have Lyme disease, and 31% of children thought to have Lyme disease did not have serologic findings at that time or within 30 days. (Level of Evidence = 1b)

Synopsis

The researchers assembled a convenience sample of children, one year and older, who underwent evaluation for Lyme disease at one of five hospital emergency departments in endemic areas, mostly on the east coast of the United States (one site was in Wisconsin). The children were evaluated by clinicians who had received training on the diagnosis of Lyme disease. The diagnostic criterion was a single characteristic lesion of at least 5 cm in diameter with or without central clearing, or a single smaller but enlarging lesion associated with a known or suspected tick bite and a known interval between the bite and the onset of the lesion. Lyme disease was confirmed in 23% of the 1,021 children via a positive two-tiered serology result within 30 days of presentation (82.4% of diagnoses) or a physician-diagnosed erythema migrans lesion at the time of presentation. Clinician suspicion in cases without clear erythema migrans was minimally accurate in ruling in or ruling out Lyme disease (concordance statistic = 0.75; 95% confidence interval, 0.71 to 0.79). Of the 554 children (54%) thought to be unlikely to have Lyme disease, 12% had a positive laboratory diagnosis, and 39 (31%) of the 127 children deemed to be very likely to have Lyme disease by clinicians did not have Lyme disease.

Study design: Cohort (prospective)

Funding source: Foundation

Setting: Emergency department

Reference: Nigrovic LE, Bennett JE, Balamuth F,

POEMs (patient-oriented evidence that matters) are provided by EssentialEvidence Plus, a point-of-care clinical decision support system published by Wiley-Blackwell. For more information, please see http://www.essentialevidenceplus.com. Copyright Wiley-Blackwell. Used with permission.

For definitions of levels of evidence used in POEMs, see http://www.essentialevidenceplus.com/product/ebm_loe.cfm?show=oxford.

To subscribe to a free podcast of these and other POEMs that appear in AFP, search in iTunes for “POEM of the Week” or go to http://goo.gl/3niWXb.

This series is coordinated by Sumi Sexton, MD, Editor-in-Chief.

A collection of POEMs published in AFP is available at http://www.aafp.org/afp/poems.

 

 

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