Definitions of the levels of evidence (Class I-IV), translation of evidence to recommendations (levels A-C), and rating of strength of recommendation (A, B, C, U) are provided at the end of the Major Recommendations field.
Laboratory Studies and Lumber Puncture
Should laboratory studies, including lumbar puncture, be performed in children with recurrent headache?
Recommendations: There is inadequate documentation in the literature to support any recommendation as to the value of routine laboratory studies or performance of routine lumbar puncture in the evaluation of recurrent headache in children (Level U recommendation; Class IV evidence).
Should an electroencephalogram (EEG) be performed in children with recurrent headaches?
Recommendations:
- EEG is not recommended in the routine evaluation of a child with recurrent headaches, as it is unlikely to provide an etiology, improve diagnostic yield, or distinguish migraine from other types of headaches (Level C recommendation; Class II and Class III evidence).
- Although the risk of future seizures is negligible in children with recurrent headache and paroxysmal EEG, future investigations for epilepsy should be determined by clinical follow up (Level C recommendation; Class II and Class III evidence).
Neuroimaging
Should computed tomography (CT) or magnetic resonance imaging (MRI) be performed in children with recurrent headaches?
Recommendations:
- Obtaining a neuroimaging study on a routine basis is not indicated in children with recurrent headaches and a normal neurologic examination (Level B recommendation; Class II and Class III evidence).
- Neuroimaging should be considered in children with an abnormal neurologic examination (e.g., focal findings, signs of increased intracranial pressure, significant alteration of consciousness), the co-existence of seizures, or both. (Level B recommendation; Class II and Class III evidence).
- Neuroimaging should be considered in children in whom there are historical features to suggest the recent onset of severe headache, change in the type of headache or if there are associated features that suggest neurologic dysfunction (Level B recommendation; Class II and Class III evidence).
Definitions:
Level of Evidence
Class I: Evidence provided by a prospective study of a broad spectrum of persons who may be at risk for developing the outcome (e.g., target disease, work status). The study measures the predictive ability using an independent gold standard for case definition. The predictor is measured in an evaluation that is masked to clinical presentation, and the outcome is measured in an evaluation that is masked to the presence of the predictor.
Class II: Evidence provided by a prospective study of a narrow spectrum of persons who may be at risk for developing the outcome, or by a retrospective study of a broad spectrum of persons with the outcome compared to a broad spectrum of control subjects. The study measures the predictive ability using an acceptable independent gold standard for case definition. The risk factor is measured in an evaluation that is masked to the outcome.
Class III: Evidence provided by a retrospective study where either the persons with the condition or the control subjects are of a narrow spectrum. The study measures the predictive ability using an acceptable independent gold standard for case definition. The risk factor is measured in an evaluation that is masked to the outcome.
Class IV: Any design where the predictor is not applied in a masked evaluation OR evidence provided by expert opinion or case series without controls.
Translation of Evidence to Recommendations
Level A rating requires at least one convincing class I study or at least two consistent, convincing class II studies.
Level B rating requires at least one convincing class II study or overwhelming class III evidence.
Level C rating requires at least two convincing class III studies.
Rating of Recommendation
A = Established as useful/predictive or not useful/predictive for the given condition in the specified population.
B = Probably useful/predictive or not useful/predictive for the given condition in the specified population.
C = Possibly useful/predictive or not useful/predictive for the given condition in the specified population.
U = Data inadequate or conflicting. Given current knowledge, test, predictor is unproven.