Making migraine easier to stomach: the role of the gut-brain-immune axis in headache disorders

BACKGROUND AND PURPOSE

Headache disorders place a significant burden on the healthcare system, being the leading cause of disability in those under 50 years. Novel studies have interrogated the relationship between headache disorders and gastrointestinal dysfunction, suggesting a link between the gut-brain-immune (GBI) axis and headache pathogenesis. Although the exact mechanisms driving the complex relationship between the GBI axis and headache disorders remain unclear, there is a growing appreciation that a healthy and diverse microbiome is necessary for optimal brain health.

METHODS

A literature search was performed through multiple reputable databases in search of Q1 journals within the field of headache disorders and gut microbiome research and were critically and appropriately evaluated to investigate and explore the following; the role of the GBI axis in dietary triggers of headache disorders and the evidence indicating that diet can be used to alleviate headache severity and frequency. The relationship between the GBI axis and post-traumatic headache is then synthesized. Finally, the scarcity of literature regarding paediatric headache disorders and the role that the GBI axis plays in mediating the relationship between sex hormones and headache disorders are highlighted.

CONCLUSIONS

There is potential for novel therapeutic targets for headache disorders if understanding of the GBI axis in their aetiology, pathogenesis and recovery is increased.

Current perspectives on the development and treatment of chronic daily headache in children and adolescents

Headache disorders subsumed under the term chronic daily headache (CDH), including chronic migraine, chronic tension-type headache and new daily persistent headache, affect up to 4% of the pediatric population and can be highly disabling and challenging to effectively treat. Although historically the knowledge base about this group of headache disorders in children primarily was derived from clinical observation and extrapolation from adult studies, over the past several years there have been important research findings relevant to the development and management of pediatric CDH that can help inform clinical practice. The intent of this paper is to provide a focused review on recent empirical work done on pediatric CDH and suggest avenues for future work.

Intellectual Profile of Adolescents with Headache: A Case-Control Study Using the WISC-IV

There are few literature evidences about the intellectual profile of adolescents with headache and no study has used the fourth edition of the Wechsler Intelligence Scale for Children (WISC-IV) in patients with a diagnosis of headache according to the ICHD-III-beta. We recruited 30 patients (age 11–14 years; male:female = 1:2) seen for headache in a tertiary center in Northern Italy and 30 healthy controls matched for age and sex, recruited in a public school from the same geographic area. The diagnosis of headache was done according to the ICHD-III criteria (beta version): the case group was composed of 16 patients with migraine and 14 with tension-type headache. Cognitive functioning was assessed using the WISC-IV. Recruited patients with idiopathic headache diagnosis had on average a cognitive function within the normal range. We found no statistically significant differences in the total Intellective Quotient comparing patients with headache and controls; the Working Memory Index was, however, lower in patients with headache (p = 0.012), and in particular, we found a lower Digit Span (p < 0.001). We also found a borderline statistical difference (p = 0.051) between case and controls Verbal Comprehension Index (CVI), which was due to a lower score in the Similarities subtest (p < 0.001). Our results suggest that, although within normal limits, cognitive functioning of adolescents with headache differs from that of healthy peers regarding memory and verbal skills. The Working Memory Index is related to the subject’s ability to store new information and keep them in short-term memory, to maintain focused attention and to manipulate them to find solutions. The difference in Similarities is also important because it provides a measure of the level of verbal reasoning and concept formation; it is also a measure of verbal abstract thinking skills relevant for language development, lexical knowledge, auditory comprehension, memory, and ability to discriminate between essential and non-essential characteristics. Our data, in keep with previous findings, suggest the need for further researches to better understand the pathogenesis of these difficulties and obtain ideas for an adequate rehabilitative treatment.

Trigger point injections for headache disorders: expert consensus methodology and narrative review

OBJECTIVE/BACKGROUND

To review the existing literature and describe a standardized methodology by expert consensus for the performance of trigger point injections (TPIs) in the treatment of headache disorders. Despite their widespread use, the efficacy, safety, and methodology of TPIs have not been reviewed specifically for headache disorders by expert consensus.

METHODS

The Peripheral Nerve Blocks and Other Interventional Procedures Special Interest Section of the American Headache Society over a series of meetings reached a consensus for nomenclature, indications, contraindications, precautions, procedural details, outcomes, and adverse effects for the use of TPIs for headache disorders. A subcommittee of the Section also reviewed the literature.

RESULTS

Indications for TPIs may include many types of episodic and chronic primary and secondary headache disorders, with the presence of active trigger points (TPs) on physical examination. Contraindications may include infection, a local open skull defect, or an anesthetic allergy, and precautions are necessary in the setting of anticoagulant use, pregnancy, and obesity with unclear anatomical landmarks. The most common muscles selected for TPIs include the trapezius, sternocleidomastoid, and temporalis, with bupivacaine and lidocaine the agents used most frequently. Adverse effects are typically mild with careful patient and procedural selection, though pneumothorax and other serious adverse events have been infrequently reported.

CONCLUSIONS

When performed in the appropriate setting and with the proper expertise, TPIs seem to have a role in the adjunctive treatment of the most common headache disorders. We hope our effort to characterize the methodology of TPIs by expert opinion in the context of published data motivates the performance of evidence-based and standardized treatment protocols.

Psychopathology in children and adolescents with primary headaches: categorical and dimensional approaches

BACKGROUND

Recurrent headache is common in childhood, but there is not a great amount of data on the associations between headaches and psychopathology in children.

OBJECTIVE

The aim of this study is to examine the relationships between primary headaches and psychopathology in children, using both the categorical and dimensional assessment.

METHODS

The sample consisted of 70 patients with primary headache compared to a matched sample of 50 healthy children. Psychiatric comorbidity was defined according to the diagnostic criteria of the Diagnostic and Statistical Manual of Disorders. Child psychopathology outcomes were assessed using child- and parent-reported standardized instruments.

RESULTS

Internalizing and externalizing problems were significantly represented among children with headaches compared to the control group, respectively 63% and 27%, without significant differences between migraine and tension-type headache children. Moreover, a total of 26% of the children with a headache reported psychiatric comorbidity such as anxiety and mood disorders.

CONCLUSION

The dimensional approach improves accuracy in the recognition of emotional and behavioral problems compared to the categorical approach; however, the use of both of these approaches could be useful for clinical practice, treatment and research.

Chronic daily headache, medication overuse, and obesity in children and adolescents

Obesity and headaches are common in children and adults. Adult studies suggest obesity is a risk factor for chronic daily headache and increased migraine frequency and severity. Pediatric studies have suggested a relationship between obesity, increasing headache frequency, and disability. The authors retrospectively evaluated 925 children from their Pediatric Headache Clinic between July 2004 and July 2008, assessing headache frequency, medication overuse, and body mass index compared to population-based norms. The pediatric headache group as a whole had a greater percentage of overweight than the general population. This was also true with the subgroup of patients with chronic tension-type headache, although the numbers were small. Data did not show increased incidence of overweight in children with medication overuse or chronic migraine. This contrasts with adult data, which have suggested a closer link between chronic migraine and obesity and have not supported a link with chronic tension-type headache.