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QUESTION: In children and adolescents with headache, are their drawings of headache pain accurate for diagnosing migraine?
Blinded comparison of children’s drawings with clinical diagnosis.
A pediatric neurology clinic in Boston, Massachusetts, USA.
226 children who were 4 to 19 years of age (mean age 11.4 y, 54% girls) and had headache.
Description of test and diagnostic standard
Children were given a blank, unlined, white piece of paper (8.5 × 11 inches) and a number 2 pencil with a rubber. They were asked to draw a picture of themselves having a headache, showing where the pain was, what the pain felt like, and any other changes or symptoms that occurred before or during the headache. When children complained of having >1 type of headache, they drew a separate picture for each type (235 drawings). Two paediatric neurologists who were blinded to the children’s clinical history analysed the drawings. The diagnostic standard was a usual clinical evaluation including history, physical examination, formulation, and clinical diagnosis by a neurologist who did not view the drawings.
Main outcome measures
Sensitivity and specificity for diagnosing migraine.
130 children (58%) had migraine or mixed headache, and 96 children (42%) had non-migraine headache. The table shows the results. Drawing features that had a positive predictive value ≥80% for migraine were focal neurologic signs (100%); periorbital pain or sharp object to eye (100%); sleep or recumbency (95%); visual symptoms (scotoma or field defect [95%] and photophobia [91%]); nausea or vomiting (91%); severe pounding or throbbing pain (83.2%); and sonophobia (80%).
In children and adolescents, drawings of headache pain were accurate for diagnosing migraine.
The study by Stafstrom et al examined the correlation of children′s drawings with an expert neurologist′s diagnosis of migraine and non-migraine headaches. Children may be able to communicate more effectively through pictures than verbally. Although several studies have used children′s drawings to gain the perspective of children dealing with medical conditions, some related to migraine, this study is the first to investigate how their pictures might help with diagnosis.
The reference standard used for diagnosis of migraine was practical, but not generalisable. Rather than use a set of strict criteria such as those of the International Headache Society (IHS), this study used the opinion of 1 neurologist, who knew the IHS criteria but made the diagnosis“solely on clinical grounds.” Using 1 neurologist′s determination as the reference standard is practical, and clearly reflects actual practice. The study′s generalisability could have been improved, however, by using a set of explicit criteria or having ≥2 neurologists make an independent determination.
The method for obtaining the child′s drawing was simple and reproducible. While the child drew, the physician interviewed the parent about the child′s medical history. This step could fit easily into a typical visit, without requiring extra time.
Similar to the reference standard, interpretation of the drawings were done by using neurologists′ expert opinion, without reference to an explicit set of criteria. 2 neurologists independently rated the drawings. Agreement was excellent (x = 0.92) and suggests that other studies could reproduce these findings.
The negative likelihood ratio of 0.08 indicated that a non-migraine picture would be especially helpful for ruling out migraine. The test helped less, however, in ruling out dangerous causes. Despite providing no information about headache duration or frequency, the pictures were surprisingly useful.
This study did not show that drawings could replace any step in the evaluation of a child′s headache. Asking children to draw a picture of their headaches could fit into a routine visit, however, and could provide helpful supporting information from the child′s point of view.
Source of funding: No external funding.
For correspondence: Dr C E Stafstrom, University of Wisconsin, Madison, WI, USA. E-mail.