Calcitonin Gene-Related Peptide Monoclonal Antibody Use for the Preventive Treatment of Refractory Headache Disorders in Adolescents

New Daily Persistent Headache

OBJECTIVE

This article describes the clinical features, etiology, differential diagnosis, management, and prognosis of new daily persistent headache.

LATEST DEVELOPMENTS

New daily persistent headache has attracted renewed attention as it may arise in the setting of a COVID-19 infection. Spontaneous intracranial hypotension, particularly from CSF-venous fistulas, remains an important secondary headache disorder to consider before diagnosing new daily persistent headache. Symptomatic treatment for new daily persistent headache may include acute and preventive therapies used for migraine and tension-type headache, such as triptans, oral preventive agents, onabotulinumtoxinA, and agents that target calcitonin gene-related peptide.

ESSENTIAL POINTS

New daily persistent headache is a daily headache syndrome that starts acutely and can only be diagnosed after 3 months have elapsed and other secondary and primary headache diagnoses have been excluded. The clinical manifestations largely resemble either chronic migraine or chronic tension-type headache. The underlying cause is unknown, but it is plausible that multiple etiologies exist and that it is not a single disease entity. The prognosis is variable but often poor, and the treatment approach is largely extrapolated from the management of chronic migraine and chronic tension-type headache.

Safety and Tolerability of Combining CGRP Monoclonal Antibodies with Gepants in Patients with Migraine: A Retrospective Study

INTRODUCTION

The introduction of clacitonin gene-related peptide (CGRP) monoclonal antibodies (mAbs) has revolutionized the treatment of migraines. In clinical practice gepants might be considered as a valid option to treat acute attacks in patients with migraine who are treated with mAbs. However, the safety and tolerability of such a combination is not well addressed in the real-world setting. We designed this study to evaluate the safety and tolerability of combining CGRP mAbs with gepants in the management of migraines.

METHODS

This was a retrospective, real-world, exploratory study. The participants included within the study were adult (≥ 18 years) patients diagnosed with migraine. Screening for patients who were treated with at least one GCRP mAbs was done. Data was collected from one site, the American Center for Psychiatry and Neurology, Abu Dhabi UAE. A total of 516 patients taking CGRP mAbs were identified. Extracted data from patients' electronic medical records included patient demographics, migraine characteristics, prescribed treatments, and adverse events (AEs). The tolerability and safety of the combination therapy was evaluated on the basis of documented AEs.

RESULTS

Among the identified 516 patients, 234 were administered gepants in addition to the CRGP mAb (215, rimegepant; 19, ubrogepant). Eleven of the 234 patients switched from rimegepant to urogepant as a result of lack of efficacy; one patient switched from urogepant to zolmitriptan because of the lack of insurance coverage of the former medication. Among all the patients included in this study, three AEs were documented. These AEs were generally mild and transient and hence did not lead to discontinuation of treatment. Moreover, 42 of the 234 (17.9%) patients were switched from one class of CGRP mAbs to another at least once while continuing treatment with the assigned gepants.

CONCLUSION

The findings of this study demonstrate that combining CGRP mAbs with gepants is a safe and well-tolerated treatment approach for migraine. Future studies are warranted to further validate these findings and explore long-term outcomes.

Headache in Children and Adolescents

OBJECTIVE

This article reviews the assessment of children and adolescents presenting with headache, provides an overview of primary headache disorders, and reviews evidence-based management of headache in this age group.

LATEST DEVELOPMENTS

In the last few years, new epidemiological data have shed light on less common pediatric headache disorders (eg, pediatric trigeminal autonomic cephalalgias) and psychosocial risk factors associated with primary headache disorders in children and adolescents. There has also recently been a substantial increase in interventions that target the calcitonin gene-related peptide pathway and that treat primary headache disorders using noninvasive neuromodulation. Although these interventions have primarily been studied in adults, there is emerging evidence of their use in the pediatric population.

ESSENTIAL POINTS

Primary headache disorders are very common in youth, and the most commonly encountered headache diagnosis in neurology practice is migraine, which affects approximately 10% of children and adolescents. Diagnosing and effectively treating primary headache disorders before adulthood may have a sustained impact on the patient by improving long-term headache and mental health outcomes, thereby significantly reducing the burden of disability over time. There are several available and emerging acute and preventive interventions for youth with primary headache disorders, and treatment decisions should be made in the context of available evidence using a shared decision-making approach.

New Daily Persistent Headache (NDPH): Unraveling the Complexities of Diagnosis, Pathophysiology, and Treatment

PURPOSE OF REVIEW

The current article aims to provide an overview of new daily persistent headache (NDPH), with a particular emphasis on its pathophysiology, evaluation, and current treatment options.

RECENT FINDINGS

NDPH is an uncommon and heterogeneous condition associated with various comorbidities and is of great significance due to its prolonged duration and high severity. Variable causes and clinical aspects of NDPH may reflect differences in its underlying pathophysiological mechanisms, including genetics, environmental triggers, neuroinflammation, and brain changes. When assessing a patient with NDPH, potential triggers, past medical history, and differential diagnosis should be carefully considered. Non-pharmacological interventions aimed to improve diet, sleep patterns, and reduce consumption of caffeine and alcohol are recommended for all patients. Nerve blockade and nerve stimulation seem to be more efficacious in children than adults. Antiviral medications and neuroinflammation-targeting treatments may be helpful, particularly, when an infectious disease or severe inflammation is suspected. NDPH patients with concurrent affective disorders may benefit from treatment with serotonin reuptake inhibitors, serotonin/norepinephrine reuptake inhibitors, or benzodiazepines. Cerebrospinal-fluid-lowering medications may be useful for headaches started with a thunderclap or a Valsalva maneuver. Possible treatments for refractory NDPH include intravenous ketamine or lidocaine, onabotulinumtoxinA, and calcitonin gene-related peptide antibodies. Considering the variety of NDPH, it is critical to properly screen patients for correct diagnosis. Proper identification of potential mimics may enable precise therapy opportunities, yet there is no gold standard treatment for NDPH. Further well-designed studies are needed to elucidate the underlying mechanisms and develop effective treatment strategies for NDPH.

Advances in the Acute and Preventive Treatment of Pediatric Migraine

PURPOSE OF REVIEW

Headaches are common in children and adolescents. Treatments for debilitating migraine are often not FDA approved or lack evidence of efficacy for children. This narrative review looks at the evidence for acute and preventative pharmacologic and non-pharmacologic treatment of pediatric migraine, as well as reviewing any recent or ongoing clinical trials.

RECENT FINDINGS

Studies have been published on pharmacological treatments for headache, as well as non-pharmacological treatments. Recent findings in pediatric migraine using onabotulinumtoxinA, calcitonin gene related peptide antagonists, interventional procedures, and devices are reviewed. Pharmacologic as well as non-pharmacologic approaches for the prevention and treatment of migraine show safety and efficacy data that is promising. These treatments should be incorporated in a multi-modal approach to the management of pediatric migraine. Continued studies, prospective and randomized, are needed to further assess these newer treatments for migraine in the pediatric setting.

Ten open questions in migraine prophylaxis with monoclonal antibodies blocking the calcitonin-gene related peptide pathway: a narrative review

The monoclonal antibodies (mAbs) blocking the calcitonin-gene related peptide (CGRP) pathway, collectively called here "anti-CGRP/rec mAbs", have dramatically improved preventive migraine treatment. Although their efficacy and tolerability were proven in a number of randomized controlled trials (RCTs) and, maybe even more convincingly, in real world settings, a number of open questions remain. In this narrative review, we will analyze published data allowing insight in some of the uncertainties related to the use of anti-CGRP/rec mAbs in clinical practice: their differential efficacy in migraine subtypes, outcome predictors, switching between molecules, use in children and adolescents, long-term treatment adherence and persistence, effect persistence after discontinuation, combined treatment with botulinum toxin or gepants, added-value and cost effectiveness, effectiveness in other headache types, and potential contraindications based on known physiological effects of CGRP. While recent studies have already provided hints for some of these questions, many of them will not find reliable and definitive answers before larger studies, registries or dedicated RCTs are available.

Real Life Data on OnabotulinumtoxinA for Treatment of Chronic Migraine in Pediatric Age

BACKGROUND

The use of OnabotulinumtoxinA (OBT-A) for the treatment of chronic migraine (CM) in adults represents a therapy with the greatest efficacy and safety data. However, we have little evidence on the use of OBT-A in children or adolescents. The present study aims to describe the experience with OBT-A in the treatment of CM in adolescents in an Italian third-level headache center.

METHODS

The analysis included all patients under the age of 18 treated with OBT-A for CM at the Bambino Gesù Children's Hospital. All patients received OBT-A following the PREEMPT protocol. Subjects were classified as good responders if a greater than 50% reduction in the monthly frequency of attacks was observed, partial responders if the reduction was between 30 and 50%, and non-responders if it was <30%.

RESULTS

The treated population consisted of 37 females and 9 males with a mean age of 14.7 years. Before starting OBT-A, 58.7% of the subjects had attempted prophylactic therapy with other drugs. From OBT-A initiation to the last clinical observation, the mean duration of follow-up was 17.6 ± 13.7 SD (range: 1-48) months. The number of OBT-A injections were 3.4 ± 3 SD. Sixty eight percent of the subjects responded to treatment within the first three administrations of OBT-A. Proceeding with the number of administrations, a progressive improvement in frequency was further observed.

CONCLUSIONS

The use of OBT-A in pediatric age can have benefits in terms of reduction in the frequency and intensity of headache episodes. Furthermore, treatment with OBT-A has an excellent safety profile. These data support the use of OBT-A in the treatment of childhood migraine.

Update in the understanding of new daily persistent headache

Background Accumulating evidence suggests various specific triggers may lead to new daily persistent headache (NDPH)-like presentations, suggesting that new daily persistent headache is a heterogenous syndrome, and challenging the concept that new daily persistent headache is a primary headache disorder.Method We searched the PubMed database up to August 2022 for keywords including persistent daily headache with both primary and secondary etiologies. We summarized the literature and provided a narrative review of the clinical presentation, diagnostic work-ups, possible pathophysiology, treatment response, and clinical outcomes.Results and conclusion New daily persistent headache is a controversial but clinically important topic. New daily persistent headache is likely not a single entity but a syndrome with different etiologies. The issue with past studies of new daily persistent headache is that patients with different etiologies/subtypes were pooled together. Different studies may investigate distinct subsets of patients, which renders the inter-study comparison, both positive and negative results, difficult. The identification (and removal) of a specific trigger might provide the opportunity for clinical improvement in certain patients, even when the disease has lasted for months or years. Nonetheless, if there is a specific trigger, it remains unknown or unidentified for a great proportion of the patients. We need to continue to study this unique headache population to better understand underlying pathogenesis and, most importantly, to establish effective treatment strategies that hopefully resolve the continuous cycle of pain.

Eptinezumab for adolescents with chronic refractory headache: A retrospective chart review

OBJECTIVE

To evaluate the safety and efficacy of eptinezumab for the treatment of chronic refractory headache in adolescents.

BACKGROUND

Chronic refractory headache can lead to school absences and impaired quality of life in adolescents, and currently there are no pharmacologic treatments with level A evidence for headache prevention for this population. While observational data suggest that monoclonal antibodies to calcitonin gene-related peptide or its receptor may be helpful for adolescents who have refractory primary headache disorders, evidence is lacking for the use of eptinezumab.

METHODS

This was a single-center, retrospective chart review. Demographic and headache phenotypic data were collected. Outcome measures included headache intensity and frequency pre- and post-infusion(s), and improvement in function or in associated symptoms. Adverse events were also collected.

RESULTS

Nine patients with chronic migraine and two with new daily persistent headache received a first dose of 100 mg of eptinezumab. All of them had daily headache and nine had continuous headache at baseline. After the first infusion of 100 mg, two patients were no longer having daily headache, one patient stopped having continuous headache, and four patients noted headache intensity reduction. Additionally, one patient described a reduction in nausea and vomiting, and another patient noted improvement in function. Six patients received a second eptinezumab infusion of 100 mg, three had a third one, and one patient had four infusions of 100 mg. After the second infusion, one patient noted reduction in headache frequency, one experienced lower headache intensity, and two described pain "improving." With the third and fourth infusions, patients continued to report improvement in headache intensity. Subsequent infusions of 300 mg resulted in further reductions in headache frequency and intensity for some patients. Eptinezumab was overall well tolerated.

CONCLUSION

While this was a small sample, findings suggest that eptinezumab may be a safe and effective treatment for chronic, refractory headache in adolescents.

Monoclonal Antibodies Against the Calcitonin Gene-Related Peptide and Its Receptor in Japanese Adolescents With Migraines

Introduction Adolescent migraines is a public health problem, and effective prophylactic treatment is needed. In Japan, three types of calcitonin gene-related peptide-related monoclonal antibodies (CGRP-mABs) are available. Galcanezumab, fremanezumab, and erenumab can be used for migraine prevention in ages 15 years or older, but reports on adolescent migraine treated with CGRP-mABs remain few. We described this study to report the real-world data of CGRP-mABs' efficacy for adolescents with migraines aged from 15 to 17 years old. Methods We retrospectively investigated ten adolescent migraine patients aged from 15 to 17 years old treated with CGRP-mABs. Headache impact test-6 (HIT-6), monthly headache days (MHD), and monthly acute medication intake days (AMD) before and three months after CGRP-mABs treatment were evaluated. Results Six females and four males were included. Seven had episodic migraines (EM), three had EM and tension-type headaches, one had chronic migraines (CM), and one had CM and medication-overuse headaches. As chief obstacles to life due to headaches, five reported them as detrimental to study, one reported them as detrimental to playing sports, and four reported missing school. The median HIT-6 was 63 (46-68) and 44 (36-65) before and three months after treatment, respectively. Median of MHD was 5.5 (1-29) and 1.5 (1-30), respectively, and the median of AMD was 5.5 (1-30) and 1 (0-30), respectively. A significant reduction of HIT-6 was observed at three months (p=0.008). Six (60%) of the ten patients experienced therapeutic effectiveness. Patients with missing school as the chief obstacle to life due to headaches seemed ineffective compared to those with other obstacles (p=0.048). There were no side effects of CGRP-mABs. Conclusion We herein described the ten adolescent migraine patients treated with CGRP-mABs. HIT-6 score significantly decreased at three months, and six of the ten patients experienced therapeutic effectiveness measured by HIT-6. Now several trials have been ongoing to test the efficacy of CGRP-mABs for adolescents. Urgent evidence accumulation is needed about CGRP-mABs for adolescents.

Review of Tolerability of Fremanezumab for Episodic and Chronic Migraine

Calcitonin gene-related peptide (CGRP) monoclonal antibodies (mAbs) were the first class of medication specifically developed for the prevention of migraine. Fremanezumab is one of four CGRP mAbs currently available and is approved by the US Food and Drug Administration (FDA) for the preventative treatment of episodic and chronic migraines. This narrative review summarizes the history of fremanezumab development, the trials that led to its approval, and the later studies published evaluating its tolerability and efficacy. Evidence of fremanezumab for clinically significant efficacy and tolerability in patients with chronic migraine is especially important when considering the high level of disability, lower quality of life scores, and higher levels of health-care utilization associated with this condition. Multiple clinical trials demonstrated superiority of fremanezumab over placebo in terms of efficacy while demonstrating good tolerability. Treatment-related adverse reactions did not differ significantly compared to placebo and dropout rates were minimal. The most commonly observed treatment-related adverse reaction was mild-to-moderate injection site reaction, described as erythema, pain, induration, or swelling at the injection site.

Outpatient Approach to Resistant and Refractory Migraine in Children and Adolescents: a Narrative Review

PURPOSE OF REVIEW

Migraine is one of the top reasons for consulting a pediatric neurologist. Although the majority of children and adolescents who receive evidence-based first-line interventions for migraine will improve substantially, a subset of patients develop resistant or refractory migraine.

RECENT FINDINGS

In this review, we summarize the level of evidence for a variety of acute and preventive treatment options to consider in children and adolescents with resistant or refractory migraine. We describe the level of evidence for interventional procedures (onabotulinumtoxinA injections, greater occipital and other nerve blocks), neuromodulation (single-pulse transcranial magnetic stimulation, external trigeminal nerve stimulation, remote electrical neuromodulation, and non-invasive vagal nerve stimulation), calcitonin gene-related peptide (CGRP) pathway antagonists (anti-CGRP monoclonal antibodies and gepants), psychological therapies, and manual therapies (acupuncture, craniosacral therapy, massage and physical therapy, and spinal manipulation).

Management of Chronic Migraine in Children and Adolescents: Where are We in 2022?

Migraine is a neurological disorder that affects millions of children and adolescents worldwide. Chronic migraine is a subtype of migraine in which patients experience headaches for more days than not each month, with accompanying symptoms of phonophobia, photophobia, nausea or vomiting for most of these headaches. The burden and impact of chronic migraine in the daily lives of children and adolescents is substantial, requiring a holistic, multidisciplinary, and biopsychosocial approach to conceptualization and treatment. The purpose of this review is to provide a comprehensive “2022” overview of acute and preventive treatments for the management of chronic migraine in youth. We first describe diagnostic criteria for chronic migraine and highlight the state of evidence for acute and preventive treatment in children and adolescents. We then discuss emerging treatments currently receiving rigorous clinical research effort, special considerations for the treatment of chronic migraine in children and adolescents, and avenues for improving existing treatments and expanding access to evidence-based care.

Headache in the Pediatric Population: Focus on Migraine

Pediatric headache is a common condition with significant impact on quality of life and ability to function in academic, social, and extracurricular activities. Most pediatric patients seen in primary care and neurology clinics with headache have primary headache disorders. Diagnosis is largely based on clinical history. Imaging is rarely needed in the absence of red flag features. Careful diagnosis is important to guide appropriate treatment. Treatment focuses on a biopsychosocial model integrating lifestyle, pharmacologic and nonpharmacologic treatment modalities. As few therapies are approved in the pediatric population, treatments are often used off-label based on evidence extrapolated from adult studies. Outcomes vary over time but are generally favorable when headache disorders are diagnosed promptly and managed in a multidisciplinary setting.

Refractory Headaches

Medication overuse headache (MOH), new daily persistent headache (NDPH), and persistent refractory headache attributed to severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) infection represent a significant burden in terms of disability and quality of life, and a challenge in terms of definition, pathophysiology, and treatment. Regarding MOH, prevention without withdrawal is not inferior to prevention with withdrawal. Preventive medications like topiramate, onabotulinumtoxinA, and calcitonin gene-related peptide (CGRP) monoclonal antibodies improve chronic migraine with MOH regardless of withdrawal. The differential diagnosis of NDPH is broad and should be carefully examined. There are no guidelines for the treatment of NDPH, but options include a short course of steroids, nerve blocks, topiramate, nortriptyline, gabapentin, CGRP monoclonal antibodies, and onabotulinumtoxinA. The persistence of headache 3 months after SARS-CoV2 infection is a predictor of poor prognosis.

From the New Diagnostic Criteria to COVID-19 Pandemic Passing Through the Placebo Effect. What Have We Learned in the Management of Pediatric Migrane Over the Past 5 Years?

In 2018, the Food and Drug Administration (FDA) approval of anti-calcitonin gene-related peptide (CGRP) therapies for the treatment of migraine represented a milestone for the management of the disease in adults. On the contrary, the novelties in the field of pediatric migraine are inserted in a different scenario and still concern: (1) diagnostic criteria of the international classification of headache disorders-3 (ICHD-3) that show numerous limits of applicability in the developmental age; (2) the release of the results of the Childhood and Adolescent Migraine Prevention (CHAMP) study that raised doubts about the usefulness of traditional drugs for the treatment of pediatric migraine; (3) the Coronavirus disease 2019 (COVID-19) pandemic has put the spotlight on the importance of managing the psychological factors associated with the disease. In this mini review we discuss the most relevant news in pediatric migraine over the last 5 years.

Comparison and predictors of chronic migraine vs. new daily persistent headache presenting with a chronic migraine phenotype

Objective

To compare the clinical phenotype of patients with chronic migraine (CM) to patients with new daily persistent headache of the chronic migraine subtype (NDPH‐CM).

Methods

A study was conducted of CM (n = 257) and NDPH‐CM (n = 76) from a tertiary headache center in the UK, and in the US of patients with daily CM (n = 60) and NDPH‐CM (n = 22).

Results

From the UK cohort, the age of first headache onset was lower in CM (mean ± SD: 16 ± 12 years) than in NDPH‐CM (mean ± SD: 23 ± 14 years; p < 0.001). There was a greater number of associated migrainous symptoms in CM compared to NDPH‐CM (median and interquartile range: 6, 5–8 vs. 5, 4–7; p < 0.001). A family history of headache was more common in CM compared to NDPH‐CM (82%, 202/248, vs. 53%, 31/59; p < 0.001). In the US cohort there were no differences. Osmophobia (B = −1.08; p = 0.002) and older age at presentation to the clinic (B = −0.06; p = 0.001) were negative predictors of NDPH‐CM.

Conclusion

NDPH‐CM is relatively less migrainous than CM in the UK cohort. Family history of headache is less common in NDPH‐CM, with negative predictors for NDPH‐CM including osmophobia and older age of presentation to the clinic. More work is required to understand the chronic migraine phenotype of new daily persistent headache.

Advances in pharmacotherapy for the prophylactic treatment of resistant and refractory migraine

INTRODUCTION

Refractory migraine is associated with low quality of life and great socioeconomic burden. Despite high need for effective, tolerable preventive therapies, there has been little research on potential therapeutic options. Monoclonal antibodies (mAbs) against Calcitonin Gene-Related Peptide (CGRP) are the first preventive therapeutic approach for migraine based on the underlying pathophysiology.

AREAS COVERED

Following a brief introduction into the term 'refractory migraine,' the authors reviewavailable treatment options, focusing on current phase III trials of substances acting on the CGRP pathway.

EXPERT OPINION

No uniform definition for refractory migraine is available. The vast majority of proposals recommend treatment failure of 2-4 drug classes as a key diagnostic criterion. Phase III studies on CGRP-(receptor) mAbs demonstrated excellent efficacy and tolerability in patients with chronic and episodic migraine including subjects with multiple unsuccessful conventional therapy attempts. However, more comparator trials showing superiority of mAbs versus oral preventatives, such as the HER-MEs study are needed. In summary, with the CGRP antibodies, a group of drugs has entered the market which will most likely not only significantly improve the quality of life of many individual migraine patients but could also reduce indirect health-care costs associated with migraine by reducing recurrent medical consultations.

Migraine Pathophysiology in Children and Adolescents: A Review of the Literature

Although migraine in adult and pediatric patients are overall very similar to each other, differences in prevalence, presentation, and treatment efficacy may reflect slight differences in the pathophysiological processes underlying migraine in these patient groups, perhaps because of ongoing development of the nervous system during childhood and adolescence. Although major gains have been made in understanding the pathophysiology of migraine in adults in recent years, equivalent research on migraine in pediatric patients continues to lag behind. In this review, we will describe the current state of migraine research in pediatric patients with regard to presentation and frequency of prodromal and postdromal symptoms, ictal and interictal calcitonin gene-related peptide elevation, and evidence for cortical spreading depression, thus covering all phases of migraine, and discuss how the findings seen here may relate to possible underlying pathophysiological mechanisms of migraine. We aim to elucidate possible differences between migraine in children and adults, and the need for further research specific to pediatric patients with migraine in order to improve treatment in this patient group.

Outcomes That Matter to Adolescents With Continuous Headache Due to Chronic Migraine and Their Parents: A Pilot Survey Study

BACKGROUND

Children and adolescents with chronic migraine who have continuous headache may have high levels of headache-related disability but have largely been excluded from clinical trials. Understanding patient-valued treatment outcomes may facilitate future study design.

OBJECTIVE

To identify patient-valued outcome measures for headache preventive treatments among adolescents with continuous headache due to chronic migraine and their parents.

METHODS

Adolescents with an ICHD-3 diagnosis of chronic migraine, who had continuous headache and who were being cared for at a tertiary pediatric headache clinic, and their parents, were surveyed to query the value of treatment outcomes in the domains of headache frequency, intensity, functional impact, and associated symptoms. Individual outcomes and categories of outcomes were ranked in order of preference using weighted average rank. Results were rounded to the degree of precision with which they were measured.

RESULTS

The survey was completed by 55 adolescents and 60 parents of adolescents with continuous headache due to chronic migraine. Mean age of adolescents was 16 (SD 1, range 12 to 17). Median adolescent-reported duration of continuous headache was 24 months (IQR 12-39) and adolescents had tried a median (IQR) of 2 (0-5) preventive medications, only 13% of which were perceived as helpful. Overall, the most valued individual outcome measure among both adolescents and parents was a decrease in frequency of more severe headaches; however, outcomes reflecting headache intensity were most valued by adolescents while outcomes reflecting functional impact were most valued by parents. Over 60% of adolescents felt that it was more important to measure decrease in frequency and intensity of headaches in terms of severe headaches/spikes rather than total headache days. Among associated symptoms, improvement in "brain fog" was most highly valued by both adolescents and parents.

DISCUSSION

The results of this study provide important information about which preventive treatment outcomes are valued by adolescents with continuous headache due to chronic migraine and their parents. Results suggest that adolescents value a decrease in frequency of severe headaches over a decrease in frequency of headache days overall. Generalizability may be limited as the surveyed population were being cared for at a tertiary pediatric headache clinic and generally had headache disorders that were refractory to treatment. These results may help guide future trial design in this population with continuous headache due to chronic migraine.

TRIAL REGISTRATION

NA.

Emerging Pharmacological Treatments for Migraine in the Pediatric Population

Headaches in children and adolescents have high incidence and prevalence rates, with consequent elevated disability costs to individuals and the community. Pediatric migraine is a disorder with substantial clinical differences compared to the adult form. Few clinical trials have been performed specifically on primary headache in pediatric populations using acute and preventative treatments, often with conflicting findings. The limited high-quality data on the effectiveness of treatments are also due to the high placebo effect, in terms of reductions in both the frequency and intensity of migraine attacks in the pediatric population. The recent introduction of calcitonin gene-related peptide (CGRP) pathway inhibitors and ditans is changing the treatment of migraine, but the majority of the data are still limited to adulthood. Thus, few drugs have indications for migraine treatment in the pediatric age group, and limited evidence gives guidance as to the choice of pharmacotherapy. Herein, we review the current evidence of pharmacological treatments and ongoing clinical trials on acute and preventative treatments in the pediatric population with migraine.

Emerging Pharmacological Treatments for Migraine in the Pediatric Population

Headaches in children and adolescents have high incidence and prevalence rates, with consequent elevated disability costs to individuals and the community. Pediatric migraine is a disorder with substantial clinical differences compared to the adult form. Few clinical trials have been performed specifically on primary headache in pediatric populations using acute and preventative treatments, often with conflicting findings. The limited high-quality data on the effectiveness of treatments are also due to the high placebo effect, in terms of reductions in both the frequency and intensity of migraine attacks in the pediatric population. The recent introduction of calcitonin gene-related peptide (CGRP) pathway inhibitors and ditans is changing the treatment of migraine, but the majority of the data are still limited to adulthood. Thus, few drugs have indications for migraine treatment in the pediatric age group, and limited evidence gives guidance as to the choice of pharmacotherapy. Herein, we review the current evidence of pharmacological treatments and ongoing clinical trials on acute and preventative treatments in the pediatric population with migraine.

CGRP in Childhood and Adolescence Migraine: (Patho)physiological and Clinical Aspects

Purpose of Review

To summarise and analyse the current knowledge of CGRP metabolism in childhood and adolescence and its role in childhood and adolescence migraine.

Recent Findings

Influencing CGRP pathways is nowadays one of the main mechanisms to treat migraine. In adults, several clinical trials with different drug classes have supported this finding. However, only very little is known on these mechanisms in children and adolescents with migraine. Based on a literature search, it can be concluded that substantial parts of the CGRP pathways are already developed and working in the preterm fetus of animals. Newborn animals show high CGRP levels and high density of CGRP positive neurons and nerve fibres. In human studies, increased levels of CGRP were observed in childhood and adolescent migraine patients. Remedies based on influencing CGRP metabolism are also working in that age group. For triptans, this has clearly been shown; for gepants, no data are available, and for CGRP ligand/receptor antibodies, positive evidence is only available from case series.

Summary

Only very little is known on CGRP metabolism in childhood and adolescence. However, placebo-controlled clinical trials both on CGRP antagonists and on CGRP ligand/receptor antibodies are under way and will show in some years whether these drug classes are efficacious also in children and adolescents.

Differential Diagnosis of Cyclic Vomiting and Periodic Headaches in a Child with Ventriculoperitoneal Shunt: Case Report of Chronic Shunt Overdrainage

Fourteen months after the implantation of a ventriculoperitoneal shunt catheter, a six-year-old boy developed recurrent, severe headaches and vomiting every three weeks. The attacks were of such severity that hospitalizations for analgesic and antiemetic therapies and intravenous rehydration and electrolyte substitution were repeatedly required. The patient was asymptomatic between the attacks. After an extensive diagnostic workup-including repeated magnetic resonance imaging (MRI) and neurosurgical examinations-common differential diagnoses, including shunt overdrainage, were ruled out. The patient was transferred to a specialized pediatric pain clinic with suspected cyclic vomiting syndrome (CVS). Despite intensive and in part experimental prophylactic and abortive pharmacological treatment, there was no improvement in his symptoms. Consecutive MRI studies reinvestigating the initially excluded shunt overdrainage indicated an overdrainage syndrome. Subsequently, the symptoms disappeared after disconnecting the shunt catheter. This case report shows that even if a patient meets CVS case definitions, other differential diagnoses must be carefully reconsidered to avoid fixation error.

[CGRP antibodies in migraine prophylaxis : The new standard in migraine treatment?]

Migraine is associated with a high individual level of suffering. Therefore, an effective preventive treatment is highly important. The spectrum of classical prophylactic drugs has now been expanded to include monoclonal antibodies against calcitonin gene-related peptide (CGRP) and its receptor. These antibodies have shown reliable efficacy compared to placebo and a rapid onset of action with a low rate of side effects and negligible interactions in pivotal studies. Recently, the efficacy of the antibody was shown in many studies even on drug-refractory migraine and migraine associated with medication overuse. Comprehensive head to head comparisons with previously established drugs and among the antibodies are not yet available; however, initial studies suggest better tolerability and efficacy compared to conventional drugs and other antibodies. The role of antibodies in established treatment cascades still needs to be clarified.

Pediatric Medication-overuse Headache and Global Headache Research. A Systematic Review

Medication-overuse headache (MOH) is a relevant topic of interest but pediatric studies are scarce. Some authors have expressed their opinion regarding geographical differences in the perceived importance of adult MOH between European and North American research. To determine if there is a geographic difference in the research efforts on pediatric MOH; and to study pediatric MOH prevalence of published studies. An analysis of the Global Burden of Disease database focusing on Headache disorders prevalence per region was correlated with the region where research was conducted via PubMed search on pediatric MOH from 2006-2021. Analysis of databases from PubMed, HINARI, and ScienceDirect found 13 studies that fulfilled inclusion criteria to evaluate pediatric MOH prevalence. 6 regions were analyzed North America, Latin America, Europe, Asia, Africa, Oceania. Regions with higher prevalence of headache disorders were North America (28.45%) and Europe (28.54%).  Most pediatric MOH publications were from North America (44.2%) and Europe (37.2%). The prevalence found of pediatric MOH among pediatric headache patients is 4-11%. Prevalence increases to 20-70% among patients having a diagnosis of chronic headache. Higher prevalence was found in patients suffering post traumatic headaches. The perceived importance for pediatric MOH is similar between North America and Europe based on the research published. The prevalence varies greatly between published studies. Relationship between Post-traumatic headache and pediatric MOH prevalence should be further studied.

Monoclonal Antibodies Targeting CGRP: From Clinical Studies to Real-World Evidence-What Do We Know So Far?

Now more than ever is the time of monoclonal antibody use in neurology. In headaches, disease-specific and mechanism-based treatments existed only for symptomatic management of migraines (i.e., triptans), while the standard prophylactic anti-migraine treatments consist of non-specific and repurposed drugs that share limited safety profiles and high risk for interactions with other medications, resulting in rundown adherence rates. Recent advances in headache science have increased our understanding of the role of calcitonin gene relate peptide (CGRP) and pituitary adenylate cyclase-activating polypeptide (PACAP) pathways in cephalic pain neurotransmission and peripheral or central sensitization, leading to the development of monoclonal antibodies (mAbs) or small molecules targeting these neuropeptides or their receptors. Large scale randomized clinical trials confirmed that inhibition of the CGRP system attenuates migraine, while the PACAP mediated nociception is still under scientific and clinical investigation. In this review, we provide the latest clinical evidence for the use of anti-CGRP in migraine prevention with emphasis on efficacy and safety outcomes from Phase III and real-world studies.

Approach to Pediatric Intractable Migraine

PURPOSE OF REVIEW

Intractable migraine in children and adolescents is a significant cause of disability and decreased quality of life (QoL) in this population. Challenges include lack of unifying definition for intractable migraine, and limited data on best-practice management in this age group, with most current treatment pathways extrapolated from adult studies or expert consensus.

RECENT FINDINGS

A comprehensive approach in the evaluation and management of intractable migraine in this age group encompasses excluding secondary causes of headache; making an accurate diagnosis; identifying and appropriately managing modifiable risk factors; and initiating appropriate pharmacologic therapy to reduce disability, improve health-related quality of life, reduce risk of progression, and develop adaptive pain coping strategies. Several strategies for management of pediatric intractable migraine including use of acute medications, bridge therapy in outpatient setting, emerging therapies for preventive therapy, and a stepwise combination therapy for management of pediatric intractable migraine in emergency and inpatient setting are presented based on available clinical data, safety/tolerability, availability, cost-effectiveness, and expert consensus. This descriptive review of the available literature focuses on approach to therapy for acute intractable migraine in a pediatric population including outpatient, emergency department (ED), and inpatient management.