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Treating Migraines: It's Different for Kids

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Treating Migraines: It's Different for Kids ® Priority Updates from the Research Literature PURLs from the Family Physicians Inquiries Network Matthew Hawks, MD; Anne Mounsey, MD Nellis AFB Family Medicine Treating migraines: Residency, Las Vegas, Nev (Dr. Hawks); Department of Family Medicine, The It’s different for kids University of North Carolina, Chapel Hill (Dr. Mounsey) Certain medications used for migraine prevention in DEPUTY EDITOR adults do not perform the same way in children and Shailendra Prasad, MBBS, MPH adolescents and can actually cause harm. Department of Family Medicine and Community Health, University of Minnesota, Minneapolis PRACTICE CHANGER Drug Administration (FDA) has not approved Do not prescribe amitriptyline or topiramate any medications for preventing migraines as preventive therapy for migraine in chil- in children younger than 12 years of age. dren; both drugs are no better than placebo However, surveys of pediatric headache for this population and are associated with specialists suggest that amitriptyline and increased rates of adverse events.1,2 topiramate are among the most commonly prescribed medications for childhood mi- STRENGTH OF RECOMMENDATION graine prophylaxis.3,4 A: Based on a single double-blind random- There is low-quality evidence from indi- ized control trial (RCT) and supported by a vidual randomized controlled trials (RCTs) meta-analysis of 4 RCTs. about the effectiveness of topiramate. A me- 1. Powers SW, Coffey CS, Chamberlin LA, et al; for the CHAMP Inves- ta-analysis by El-Chammas and colleagues tigators. Trial of amitriptyline, topiramate, and placebo for pediatric migraine. N Engl J Med. 2017;376:115-124. included 3 RCTs comparing topiramate to 2. Le K, Yu D, Wang J, et al. Is topiramate effective for migraine preven- placebo for the prevention of episodic mi- tion in patients less than 18 years of age? A meta-analysis of random- graines (migraine headaches that occur ized controlled trials. J Headache Pain. 2017;18:69. <15 times/month) in a combined total of 283 children younger than 18 years of age.5 ILLUSTRATIVE CASE Topiramate demonstrated a nonclinically A 15-year-old girl presents to your clinic with significant, but statistically significant, reduc- INSTANT poorly controlled chronic migraines that are tion of less than one headache per month POLL preventing her from attending school 3 to (-0.71; 95% confidence interval [CI], -1.19 to 4 days per month. As part of her treatment -0.24). This is based on moderate quality evi- Do you prescribe regimen, you are considering migraine pre- dence due to a high placebo response rate amitriptyline or vention strategies. and study durations of only 12 weeks.5 The topiramate to pre- Should you prescribe amitriptyline or FDA has approved topiramate for migraine vent migraines in topiramate for preventive migraine therapy? prevention in children ages 12 to 17 years.6 patients younger ❚ Adult guidelines. The findings de- than 18 years of igraine headaches are the most scribed above are consistent with the most age? common reason for headache recent adult guidelines from the American presentation in pediatric neurol- Academy of Neurology and the American n Yes M 7 ogy outpatient clinics, affecting 5% to 10% of Headache Society. In a joint publication n No the pediatric population worldwide.2 Current from 2012, these societies recommended recommendations regarding prophylactic both topiramate and amitriptyline for mdedge.com/ migraine therapy in childhood are based on the prevention of migraines in adults jfponline consensus opinions.3,4 And the US Food and based on high-quality (Level A evidence) 238 THE JOURNAL OF FAMILY PRACTICE | APRIL 2018 | VOL 67, NO 4 and medium-quality evidence (Level B), fatigue (number needed to harm [NNH]=8) respectively.7 and dry mouth (NNH=9) and was associ- ated with 3 serious adverse events of altered mood. Compared with placebo, topiramate STUDY SUMMARY significantly increased paresthesia (NNH=4) Both drugs are no better than and weight loss (NNH=13) and was associated placebo in children with one serious adverse event—a suicide A multicenter, double-blind RCT by Powers attempt.1 and colleagues compared the effectiveness of amitriptyline, topiramate, and placebo in the prevention of pediatric migraines.1 Tar- WHAT’S NEW? get dosing for amitriptyline and topiramate Higher-level evidence was set at 1 mg/kg/d and 2 mg/kg/d, respec- demonstrates lack of efficacy tively. Titration toward these doses occurred This RCT provides new, higher-level evidence over an 8-week period based on reported ad- that demonstrates the lack of efficacy of ami- verse effects. Patients then continued their triptyline and topiramate in the prevention of maximum tolerated dose for an additional pediatric migraines. It also highlights the risk 16 weeks. of increased adverse events with topiramate Patients were predominantly white and amitriptyline. (70%), female (68%), and 8 to 17 years of age. Two of the 3 topiramate trials used in After 24 weeks They had at least 4 headache days over a pro- the older meta-analysis by El-Chammas and of therapy, spective 28-day pre-treatment period and colleagues5 and this new RCT1 were included there was no a Pediatric Migraine Disability Assessment in an updated meta-analysis by Le and col- significant Scale (PedMIDAS) score of 11 to 139 (mild leagues (total participants 465) published difference to moderate disability=11-50; severe disabil- in 2017.2 This newer meta-analysis found no between ity >50).1,8 The primary endpoint consisted of statistical benefit associated with the use of amitriptyline, at least a 50% relative reduction (RR) in the topiramate over placebo. It demonstrated topiramate, and number of headache days over the 28-day a nonsignificant decrease in the number of placebo in the pre-therapy (baseline) period compared with patients with at least a 50% relative reduc- primary or the final 28 days of the trial.1 tion in headache frequency (risk ratio = 1.26; secondary The authors of the study included 95% CI, 0.94-1.67) and in the overall number outcomes. 328 patients in the primary efficacy analy- of headache days (mean difference = -0.77; sis and randomly assigned them in a 2:2:1 95% CI, -2.31 to 0.76) in patients younger than ratio to receive either amitriptyline (132 pa- 18 years of age.2 Both meta-analyses, how- tients), topiramate (130 patients), or placebo ever, showed an increase in the rate of ad- (66 patients), respectively. After 24 weeks verse events in patients using topiramate vs of therapy, there was no significant differ- placebo.2,5 ence between the amitriptyline, topiramate, and placebo groups in the primary endpoint (52% amitriptyline, 55% topiramate, 61% pla- CAVEATS cebo; adjusted odds ratio [OR]=0.71; 98% CI, Is there a gender 0.34-1.48; P=.26 between amitriptyline and predominance? placebo; OR=0.81; 98% CI, 0.39-1.68; P=.48 El-Chammas and colleagues5 describe male between topiramate and placebo; OR=0.88; pediatric patients as being the predominant 98% CI, 0.49-1.59; P=.49 between amitripty- pediatric gender with migraines. However, line and topiramate). they do not quote an incidence rate or cite There was also no difference in the sec- the reference for this statement. No other ref- ondary outcomes of absolute reduction in erence to gender predominance was noted in headache days and headache-related disabil- the literature. The current study,1 in addition ity as determined by PedMIDAS. The study to the total population of the meta-analysis was stopped early for futility. Compared with by Le and colleagues,2 included women as placebo, amitriptyline significantly increased the predominant patient population. Hope- MDEDGE.COM/JFPONLINE VOL 67, NO 4 | APRIL 2018 | THE JOURNAL OF FAMILY PRACTICE 239 PURLs® fully, future studies will help to delineate if there is a gender predominance and, if so, References whether the current treatment data apply to 1. Powers SW, Coffey CS, Chamberlin LA, et al; for the CHAMP Investigators. Trial of amitriptyline, topiramate, and placebo for both genders. pediatric migraine. N Engl J Med. 2017;376:115-124. 2. Le K, Yu D, Wang J, et al. Is topiramate effective for migraine pre- vention in patients less than 18 years of age? A meta-analysis of randomized controlled trials. J Headache Pain. 2017;18:69. CHALLENGES TO IMPLEMENTATION 3. Lewis D, Ashwal S, Hershey A, et al. Practice parameter: phar- macological treatment of migraine headache in children and None to speak of adolescents: report of the American Academy of Neurology Quality Standards Subcommittee and the Practice Committee There are no barriers to implementing this of the Child Neurology Society. Neurology. 2004;63:2215-2224. recommendation immediately in all primary 4. Hershey AD. Current approaches to the diagnosis and manage- ment of paediatric migraine. Lancet Neurology. 2010;9:190-204. care settings. JFP 5. El-Chammas K, Keyes J, Thompson N, et al. Pharmacologic treatment of pediatric headaches: a meta-analysis. JAMA Pedi- ACKNOWLEDGEMENT atr. 2013;167:250-258. The PURLs Surveillance System was supported in part by 6. Qudexy XR. Highlights of prescribing information. Avail- Grant Number UL1RR024999 from the National Center For able at: https://www.accessdata.fda.gov/drugsatfda_docs/ Research Resources, a Clinical Translational Science Award to label/2017/205122s003s005lbl.pdf. Accessed March 15, 2018. the University of Chicago. The content is solely the responsi- 7. Silberstein SD, Holland S, Freitag F, et al. Evidence-based guide- bility of the authors and does not necessarily represent the line update: pharmacologic treatment for episodic migraine official views of the National Center For Research Resources prevention in adults: report of the Quality Standards Subcom- mittee of the American Academy of Neurology and the Ameri- or the National Institutes of Health. can Headache Society.
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