Pediatric Aspects of Headache Classification in the International Classification of Headache Disorders—3 (ICHD-3 beta version)

The kynurenine pathway of tryptophan metabolism in abdominal migraine in children - A therapeutic potential?

BACKGROUND

Abdominal migraine (AM) is a clinical diagnosis specified by Rome IV and ICHD III as a functional gastrointestinal disease (FGID) and a migraine associated syndrome, respectively. Abdominal migraine in childhood and adolescence may continue with migraine headaches in adulthood. This disease is undiagnosed and undertreated, and thus far the FDA has not approved any drug for AM treatment. It was shown that changes in the kynurenine (KYN) pathway of tryptophan (TRP) metabolism played an important role in the pathogenesis and treatment of FIGDs and associated mood disorders. Changes in the KYN pathway were shown in migraine and therefore it may be involved in AM pathogenesis.

FINDINGS

Abdominal migraine reflects an impairment in the communication within the gut-brain axis. Treatment approaches in AM are based on the experience of physicians, presenting personal rather than evidence-based practice, including efficacy of some drugs in adult migraine. Non-pharmacological treatment of AM is aimed at preventing or ameliorating AM triggers and is based on the STRESS mnemonic. Metabolic treatments with riboflavin and coenzyme Q10 were effective in several cases of pediatric migraine, but in general, results on metabolic treatment in migraine in children are scarce and nonconclusive. Modulations within the KYN pathway of TRP metabolism induced by changes in TRP content in the diet, may ameliorate FGIDs and support their pharmacological treatment. Pharmacological manipulations of brain KYNs in animals have brought promising results for clinical applications. Obese children show a higher headache prevalence and may be especially predisposed to AM, and KYN metabolites showed an alternated distribution in obese individuals as compared with their normal-weight counterparts.

CONCLUSIONS

In conclusion, controlled placebo-based clinical trials with dietary manipulation to adjust the amount of the product of the KYN pathway of TRP metabolism are justified in children and adolescents with AM, especially those with coexisting obesity. Further preclinical studies are needed to establish details of these trials.

Relationship between sleep problems and headaches among adolescents: Pelotas 2004 Birth cohort

Objective

To investigate the cross-sectional association between sleep problems (the exposure) and headaches (the outcome) among 15-year-olds from the Pelotas 2004 Birth Cohort, a population-based study in the south of Brazil.

Method

The occurrence of headaches was obtained through the question: "Do you usually suffer headaches?" and the ICHD-3 criteria were used to classify as: tension-type headache, headache with characteristics of migraine with or without aura, or other. Regarding sleep, the weekly frequency in the last month of insomnia and bad dreams/nightmares, and self-reported sleep quality were investigated. Unadjusted and adjusted prevalence ratios (PR) with 95% confidence intervals were calculated using Poisson regression with robust variance.

Results

A total of 1916 adolescents were analyzed. The prevalence of headaches was 51.6% (69.0% in females and 34.8% in males): 31.8% (39.7% vs. 24.1%) reported tension-type headache; 14.7% (21.9% vs. 7.8%), headaches with characteristics of migraines without aura; 3.6%, headaches with characteristics of migraines with aura; and 1.5% (5.1% vs. 2.3%), other types. Adolescents with insomnia ≥3 times/week presented higher probability of headaches (PR = 1.54; 95%CI 1.23-1.93), compared with those with no problems falling asleep or maintaining sleep. Among those who classified their sleep as poor/very poor, the probability of headaches was 33% higher (PR = 1.33; 95%CI 1.13-1.57) than among those who classified their sleep as very good.

Conclusions

Headaches were highly prevalent among the adolescents and were related to sleep problems even after allowing for several confounders.

Tension-Type Headache in Children and Adolescents

In pediatric neurology, tension-type headache (TTH) represents a very common type of primary headache during the pediatric age. Despite the high prevalence of TTH, this diagnosis is often underestimated in childhood, with relevant difficulties in the differential diagnosis of TTH from secondary and primary headache manifestations. Even among primary headaches, a clinical overlap is not so infrequent in children: migraine attacks could present tension headache-like features while tension-type headaches may display migraine-like symptoms as well. Several variables play a role in the complex trajectory of headache evolution, such as hormonal changes during adolescence, triggers and genetic and epigenetic factors. The trajectories and outcomes of juvenile migraine and TTH, as well as the transition of one form to the other, have been investigated in several long-term prospective studies. Thus, the aim of this paper is to review the current literature on the differential diagnosis workout of TTH in pediatrics, the possible outcomes during the developmental age and the appropriate therapeutic strategies. Indeed, TTH represents a challenging diagnostic entity in pediatrics, both from a clinical and a therapeutic point of view, in which early diagnosis and appropriate treatment are recommended.

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.

Brain to Belly: Abdominal Variants of Migraine and Functional Abdominal Pain Disorders Associated With Migraine

Migraine is one of the most frequent causes of primary headache and 9% of children suffer from migraines. Most children will continue to experience migraine attacks as adults, therefore it is imperative that we have a thorough understanding of this major health issue. This article considers the so-called abdominal variants of migraine, which are more commonly seen in children rather than adults: abdominal migraine, cyclic vomiting syndrome, and infantile colic. Other functional abdominal pain disorders such as irritable bowel syndrome and functional dyspepsia have also been linked to migraine in clinical studies. The common pathophysiological root of these diseases seems to be the gut-brain axis mechanism. Abdominal variants of migraine are considered pediatric precursors of migraine whereas the functional abdominal pain disorders related to migraine seem to share a pathophysiological root with no temporarily link as for today. In this review we aim to describe the epidemiological background, the current pathophysiological theories and the relationship of each disease to migraine. This review is the first to compile abdominal variants of migraine and functional abdominal pain disorders associated with migraine and we endeavor to elucidate the broad spectrum of migraine-related episodes in children.

Effects of Occipital Nerve Block in Pediatric Patients with Occipital Region Headache

Purpose: The aim of this study was to investigate the effects of occipital nerve block (ONB) in pediatric patients with headache in the occipital region.Methods: Among 302 patients who visited our headache clinic during a 2-year period, we retrospectively reviewed the charts of 26 patients who complained of primary headache in the occipital region, and divided them into two groups according to the main treatment: ONB or oral drug treatment (ODT).Results: The mean age of the 26 patients was 11.7±3.2 years. No statistically significant differences were found between the ONB and ODT groups in age, sex, sites of pain, duration of having experienced symptoms, and the duration, frequency, and severity of episodes (P>0.05). There was no statistically significant difference in remission between the ONB and ODT groups. However, in the ONB group, the time taken to achieve remission was significantly shorter than in the ODT group (P<0.05). Additionally, in the ONB group, the duration of medication and the period of outpatient treatment were significantly shorter than in the ODT group (P<0.05).Conclusion: In this study, ONB reduced the time taken to achieve remission and shortened the period of treatment. Thus, ONB should be considered in pediatric patients with headache in the occipital region.

Reassessment of Pediatric Tension-Type Headaches

A retrospective multicenter chart review was conducted with the objective of evaluating the hypothesis that certain cases diagnosed as tension-type headache (TTH) in pediatric neurology are not stress-related or central sensitization-related conditions but may mimic an autoimmune disorder of the dura mater. Of the 29,642 patient charts reviewed, 12,424 charts (42%) were excluded because of incomplete data and 17,218 cases were analyzed. For all the 29,642 charts, TTH or chronic daily headaches were diagnosed in 29.2% of cases. Among the 17,218 cases subjected to detailed diagnostic procedures, TTH was diagnosed in only 5%. In 7,044 cases, the initial diagnosis of TTH was changed to headache attributed to infection (87.4%), which was supported by the presence of meningeal signs, high antistreptolysin-O titers, and, in 46% of cases, magnetic resonance imaging (MRI)-detected thickening of the cranial dura mater. The initial diagnosis of migraine was confirmed in 87.7% of cases (8,034/9,162). In some cases of treatment-resistant pediatric recurrent headaches, which are initially diagnosed as TTH, a secondary type of headache may be suspected as the underlying cause. Usually this type of headache has streptococcal infection-related laboratory findings, the meninges as the site of the lesion, and meningism as the clinical presentation.

Age-related differences in resting state functional connectivity in pediatric migraine

BACKGROUND

Migraine affects roughly 10% of youth aged 5-15 years, however the underlying mechanisms of migraine in youth are poorly understood. Multiple structural and functional alterations have been shown in the brains of adult migraine sufferers. This study aims to investigate the effects of migraine on resting-state functional connectivity during the period of transition from childhood to adolescence, a critical period of brain development and the time when rates of pediatric chronic pain spikes.

METHODS

Using independent component analysis, we compared resting state network spatial maps and power spectra between youth with migraine aged 7-15 and age-matched controls. Statistical comparisons were conducted using a MANCOVA analysis.

RESULTS

We show (1) group by age interaction effects on connectivity in the visual and salience networks, group by sex interaction effects on connectivity in the default mode network and group by pubertal status interaction effects on connectivity in visual and frontal parietal networks, and (2) relationships between connectivity in the visual networks and the migraine cycle, and age by cycle interaction effects on connectivity in the visual, default mode and sensorimotor networks.

CONCLUSIONS

We demonstrate that brain alterations begin early in youth with migraine and are modulated by development. This highlights the need for further study into the neural mechanisms of migraine in youth specifically, to aid in the development of more effective treatments.

Migraine and Tension-Type Headache Among Children and Adolescents: Application of International Headache Society Criteria in a Clinical Setting

INTRODUCTION

The International Headache Society criteria were written in order to help physicians establish a headache diagnosis. However, sometimes children with headache do not seem to fit any diagnosis. The purpose of our study was to assess the application of the criteria in a clinical setting.

METHODS

Medical records of children referred for primary headache to the pediatric neurology clinic at Bnai Zion Medical Center from 2008 to 2017 were assessed.

RESULTS

A total of 989 patients (range 6-18 years; 53% female) were assessed at our neurology clinic. Twenty-four percent (n = 241) were diagnosed with tension-type headache, 26% (n = 256) with migraine, and 4.5% (45) with mixed headache. In 41.5% (410), we were unable to reach a specific diagnosis. No differences in gender or age were found between the groups. Children in the migraine group used more analgesic treatments to stop the headache attacks compared with the tension-type headache group (50% vs 38%, P = .001). Patients diagnosed with tension-type headache reported having more emotional difficulties (P = .001). No significant differences were found in headache characteristics (ie, location, sidedness, character), frequency, or intensity between the younger children (ages 6-11) and the adolescents (ages 12-18) within either the tension-type headache or migraine groups.

CONCLUSIONS

Retrospective application of International Headache Society criteria in a large cohort of children with headaches failed to diagnose a specific type of headache in 41.5% of children. Migraine and tension-type headache were equally prevalent, and both constituted a major burden on our patients' everyday lives. We found no major differences in frequency, intensity, and characteristics of pain between younger children and adolescents.

Dihydroergotamine infusion for pediatric refractory headache: A retrospective chart review

BACKGROUND

Headaches are a common symptom in children. Children with refractory headaches may be admitted for inpatient treatment with intravenous dihydroergotamine mesylate (DHE). However, very few studies have characterized these patients and their treatment outcomes using validated, self-reported, pain scales.

OBJECTIVE

The objective of this study was to describe demographic and clinical characteristics of children admitted for DHE infusion, determine DHE treatment outcomes by means of numeric pain scale ratings, and explore associations between treatment outcomes and clinical characteristics.

METHODS

Retrospective chart review was completed in patients ages 5-21 admitted for DHE infusion from January 2013 to July 2018 at a large, pediatric academic medical center and community-based satellite center. All primary headache types were included.

RESULTS

A total of 200 unique admissions for DHE were available for analysis. Overall, patients were predominantly White (87.5%, 175/200) and female (80.0%, 160/200) with an average age of 15.4 years (SD 2.3). Common comorbidities included obesity (42.0%, 81/193), anxiety (41.0%, 82/200), and depression (20.0%, 40/200). The mean length of stay was 2.4 days (SD 1.10; range 1-8 days). Most headaches (65.0%, 130/200) met the International Classification of Headache Disorders, 3rd edition criteria for migraine, followed by new daily persistent headache (25.5%, 51/200). Mean DHE maximum dose was 5.3 (SD 2.17; range 0.5-14.5 mg) with most patients requiring 3.5-6.5 mg. DHE was typically terminated at six doses (range 1-15). The most frequently reported adverse event was nausea (5.5%, 11/200). There was no difference in pain severity at admission across headache types, with an average baseline pain score of 8.1 (SD 1.6). Posttreatment reduction in pain score was statistically significant (range: -3.2 to -4.9; each p < 0.001) across all headache types. Overall, 84.0% (168/200) of the patients had some improvement in pain. More than half of the patients (53.5%, 107/200) showed at least moderate improvement (≥50.0% reduction in pain score), and 18.0% (36/200) had full headache resolution. Limited patients (16.0%, 32/200) experienced no improvement in pain.

CONCLUSIONS

Treatment with DHE resulted in at least some improvement for most patients regardless of headache type or number of doses. Clinical trials stratified by headache type and comorbid factors could help clarify treatment algorithms to optimize patient outcomes.

Fruit and vegetable consumption in relation to primary headaches: the MEPHASOUS study

BACKGROUND

Fruit and vegetable consumption may beneficially affect the odds of primary headaches due to their antioxidant contents. However, no study has examined the association between fruit and vegetable consumption and primary headaches among university students.

AIM

To assess the relation between fruit and vegetable intakes and primary headaches among Iranian university students.

METHODS

Overall, 83,214 university students with an age range of ≥ 18 years participated in the present study. Dietary intakes and also data on confounding variables were collected using validated questionnaires. Data on dietary intakes were collected using a validated dietary habits questionnaire. We used the International Classification of Headache Disorders-3 (ICHD-3) criteria to define primary headaches.

RESULTS

Fruit consumption was negatively associated with primary headaches; such that after controlling for potential confounders, greater intake of fruits was associated with 30% lower odds of primary headaches (OR: 0.70, 95% CI 0.58-0.84). Such an inverse association was also found for vegetable consumption. In the fully adjusted model, students in the top category of vegetable consumption were 16% less likely to have primary headaches compared with those in the bottom category (OR: 0.84, 95% CI 0.74-0.95). Subgroup analysis revealed that fruit consumption was inversely associated with primary headaches in females, unlike males, and vegetable consumption was inversely associated with these headaches in males, as opposed to females. Moreover, fruit and vegetable consumption was related to lower odds of primary headaches in normal-weight students.

CONCLUSION

Fruit and vegetable intakes were associated with reduced odds of primary headaches.

LEVEL OF EVIDENCE

Level III, cross-sectional analytic studies.

Breakfast consumption is inversely associated with primary headaches in university students: The MEPHASOUS study

OBJECTIVE

This study was conducted to examine the association between breakfast consumption pattern and primary headaches in a large population of university students.

METHODS

This cross-sectional study was done on the MEPHASOUS dataset that contained the information of 83,677 university students, aged ≥18 years, from 28 provinces of Iran. Dietary intakes and breakfast consumption pattern were assessed using a validated self-administered dietary habits questionnaire. Primary headaches were determined according to the International Classification of Headache Disorders-3 (ICHD-3) criteria. Binary logistic regression in different adjusted models was used to assess the association between breakfast consumption and primary headaches.

RESULTS

The mean age of participants was 21.50 ± 4.01. Primary headaches were prevalent among 9% of university students. A significant inverse association was seen between breakfast consumption and odds of primary headaches [odds ratio (OR): 0.57, 95 % confidence interval (CI): 0.51-0.62]. This association remained significant even after taking potential confounders into account; such that students who consumed breakfast frequently had 26 % lower odds of primary headaches compared with those who consumed it <1 day/week (OR: 0.74, 95 % CI: 0.65-0.85). Moreover, such a significant inverse association was observed in female students (OR: 0.54, 95 % CI: 0.49-0.61) as well as those with BMI < 25 kg/m² (OR: 0.68, 95 % CI: 0.58-0.79). However, it became non-significant in male students and those with overweight or obesity.

CONCLUSION

We found that frequent breakfast consumption is associated with a decreased odds of primary headaches in female students and those with BMI < 25 kg/m². Further prospective studies are needed to confirm our findings.

GABA and glutamate in pediatric migraine

Migraine is one of the top 5 most prevalent childhood diseases; however, effective treatment strategies for pediatric migraine are limited. For example, standard adult pharmaceutical therapies are less effective in children and can carry undesirable side effects. To develop more effective treatments, improved knowledge of the biology underlying pediatric migraine is necessary. One theory is that migraine results from an imbalance in cortical excitability. Magnetic resonance spectroscopy (MRS) studies show changes in GABA and glutamate levels (the primary inhibitory and excitatory neurotransmitters in the brain, respectively) in multiple brain regions in adults with migraine; however, they have yet to be assessed in children with migraine. Using MRS and GABA-edited MRS, we show that children (7-13 years) with migraine and aura had significantly lower glutamate levels in the visual cortex compared to controls, the opposite to results seen in adults. In addition, we found significant correlations between metabolite levels and migraine characteristics; higher GABA levels were associated with higher migraine burden. We also found that higher glutamate in the thalamus and higher GABA/Glx ratios in the sensorimotor cortex were associated with duration since diagnosis, i.e., having migraines longer. Lower GABA levels in the sensorimotor cortex were associated with being closer to their next migraine attack. Together, this indicates that GABA and glutamate disturbances occur early in migraine pathophysiology and emphasizes that evidence from adults with migraine cannot be immediately translated to pediatric sufferers. This highlights the need for further mechanistic studies of migraine in children, to aid in development of more effective treatments.

Peri-ictal headaches in the paediatric population - prospective study

INTRODUCTION

The co-occurrence of headache and epilepsy is well-documented in the adult population. The aim of the prospective study was to analyse in the paediatric population the correlations between the types of peri-ictal headaches and types of seizures. Furthermore, an attempt was made to find trends in characteristic features of peri-ictal headaches.Material: A total of 57 children with peri-ictal headache were enrolled in the study. The participants' guardians were asked to keep a diary of the seizure and peri-ictal headache episodes during a 180-day period. During follow-up visits, systematic history regarding peri-ictal headaches was taken.

RESULTS

A total of 913 seizure and 325 peri-ictal headache episodes were noted during the study. Post-ictal headaches were most common, occurring in < 1 h after the seizure, lasting minutes to hours and more likely to occur after generalised seizures, whereas pre-ictal headaches occurred 30-240 min before the seizure. In the analysed group, peri-ictal headaches were most often moderate in intensity. Only 30% of patients took analgesic medication, usually to treat post-ictal headaches.

CONCLUSION

Peri-ictal headaches are a significant health problem for patients with epilepsy. The most common type are post-ictal headaches, and they are most likely to appear after a generalised seizure.

Management of Childhood Headache in the Emergency Department. Review of the Literature

Headache is the third cause of visits to pediatric emergency departments (ED). According to a systematic review, headaches in children evaluated in the ED are primarily due to benign conditions that tend to be self-limiting or resolve with appropriate pharmacological treatment. The more frequent causes of non-traumatic headache in the ED include primitive headaches (21.8–66.3%) and benign secondary headaches (35.4–63.2%), whereas potentially life-threatening (LT) secondary headaches are less frequent (2–15.3%). Worrying conditions include brain tumors, central nervous system infections, dysfunction of ventriculo-peritoneal shunts, hydrocephalus, idiopathic intracranial hypertension, and intracranial hemorrhage. In the emergency setting, the main goal is to intercept potentially LT conditions that require immediate medical attention. The initial assessment begins with an in-depth, appropriate history followed by a complete, oriented physical and neurological examination. The literature describes the following red flags requiring further investigation (for example neuroimaging) for recognition of LT conditions: abnormal neurological examination; atypical presentation of headaches: subjective vertigo, intractable vomiting or headaches that wake the child from sleep; recent and progressive severe headache (<6 months); age of the child <6 years; no family history for migraine or primary headache; occipital headache; change of headache; new headache in an immunocompromised child; first or worst headache; symptoms and signs of systemic disease; headaches associated with changes in mental status or focal neurological disorders. In evaluating a child or adolescent who is being treated for headache, physicians should consider using appropriate diagnostic tests. Diagnostic tests are varied, and include routine laboratory analysis, cerebral spinal fluid examination, electroencephalography, and computerized tomography or magnetic resonance neuroimaging. The management of headache in the ED depends on the patient's general conditions and the presumable cause of the headache. There are few randomized, controlled trials on pharmacological treatment of headache in the pediatric population. Only ibuprofen and sumatriptan are significantly more effective than placebo in determining headache relief.

Congenital mirror movement associated with migraine: A case report

Mirror movements occur in early childhood due to the maturation of the corpus callosum of noncrossing motor pathways. Such movements are considered normal until the age of 10 and are rarely reported in children older than 10 years. Mirror movements are involuntary movements that occur in the homologous contralateral extremity on voluntary activation. Permanent mirror movements can occur with anomalies; however, also are reported familial and sporadic cases. Migraine is the most common primary headache in childhood. Its prevalence ranges from 1% to 3% between the ages of 3 and 7, and from 8% to 23% in the adolescence. The prevalence of migraine in adolescent girls is higher. For the migraine diagnosis, the imaging studies are unnecessary, and a detailed history and physical examination are sufficient. In this study, we present a case of a 17-year-old girl with mirror movements accompanied by migraine.

Headache Diagnosis in Children and Adolescents

PURPOSE OF REVIEW

Headache phenotypes can differ between adults and children. While most headaches are due to primary headache disorders, in a small population, they can be an indication of a potentially life-threatening neurologic condition. The challenge lies in identifying warning signs that warrant further workup. This article reviews different types of pediatric headaches and headache evaluation in children and teens, and focuses on the approach for diagnosis of secondary headaches.

RECENT FINDINGS

Common thought is that increased frequency and severity of headache may reflect secondary pathology; however, headache phenotype may not be fully developed and can evolve in adolescence or adulthood. Headache location, particularly occipital headache alone, does not necessarily signify secondary intracranial pathology. Certain warning signs warrant neuroimaging, but others only warrant imaging in certain clinical contexts. Brain MRI is the neuroimaging modality of choice, though there is a high rate of incidental findings and often does not change headache management. A stepwise approach is essential to avoid missing secondary headaches. There are several differences between adults and children in clinical manifestations of headache. Evaluation and diagnosis of pediatric headache starts with a thorough headache and medical history, family and social history, and identification of risk factors. A thorough physical and neurologic exam is important, with close attention to features that could suggest secondary headache pathology. Neuroimaging and other testing should only be performed if there is concern for secondary headache.

Experts' opinion about the primary headache diagnostic criteria of the ICHD-3rd edition beta in children and adolescents

BACKGROUND

The 2013 International Classification of Headache Disorders-3 (ICHD-3) was published in a beta version to allow the clinicians to confirm the validity of the criteria or to suggest improvements based on field studies. The aim of this work was to review the Primary Headache Disorders Section of ICHD-3 beta data on children and adolescents (age 0-18 years), and to suggest changes, additions, and amendments.

METHODS

Several experts in childhood headache across the world applied different aspects of ICHD-3 beta in their normal clinical practice. Based on their personal experience and the literature available on pediatric headache, they made observations and proposed suggestions for the primary headache disorders section of ICHD-3 beta data on children and adolescents.

RESULTS

Some headache disorders in children have specific features which are different from those seen in adults and which should be acknowledged and considered. Some features in children were found to be age-dependent: clinical characteristics, risks factors and etiologies have a strong bio psycho-social basis in children and adolescents making primary headache disorders in children distinct from those in adults.

CONCLUSIONS

Several recommendations are presented in order to make ICHD-3 more appropriate for use with children.

Chronic Pain in Children and Adolescents: Diagnosis and Treatment of Primary Pain Disorders in Head, Abdomen, Muscles and Joints

Primary pain disorders (formerly "functional pain syndromes") are common, under-diagnosed and under-treated in children and teenagers. This manuscript reviews key aspects which support understanding the development of pediatric chronic pain, points to the current pediatric chronic pain terminology, addresses effective treatment strategies, and discusses the evidence-based use of pharmacology. Common symptoms of an underlying pain vulnerability present in the three most common chronic pain disorders in pediatrics: primary headaches, centrally mediated abdominal pain syndromes, and/or chronic/recurrent musculoskeletal and joint pain. A significant number of children with repeated acute nociceptive pain episodes develop chronic pain in addition to or as a result of their underlying medical condition "chronic-on-acute pain." We provide description of the structure and process of our interdisciplinary, rehabilitative pain clinic in Minneapolis, Minnesota, USA with accompanying data in the treatment of chronic pain symptoms that persist beyond the expected time of healing. An interdisciplinary approach combining (1) rehabilitation; (2) integrative medicine/active mind-body techniques; (3) psychology; and (4) normalizing daily school attendance, sports, social life and sleep will be presented. As a result of restored function, pain improves and commonly resolves. Opioids are not indicated for primary pain disorders, and other medications, with few exceptions, are usually not first-line therapy.