Secondary headache attributed to exposure to or overuse of a substance

Headache Attributed to a Substance or Its Withdrawal

Identification of substances that may cause or trigger headache is important to start effective treatment early to prevent unnecessary suffering, deterioration in quality of life, and the development of chronic pain. Treatment in case of medication overuse and other chronic headache should be decisive and effective. Drug withdrawal and introduction of effective prophylactic medication for the underlying headache disorder should be the primary treatment strategy. Typical headache-inducing substances are nitric oxide, phosphodiesterase, cocaine, alcohol, histamine, carbon oxide, and calcitonin gene-related peptide. The withdrawal of caffeine, estrogen, and opioids is most often associated with the development of headache.

Higher frequency of medication overuse headache in patients attended by neurologists in Lima, Peru

BackgroundThe type of medical care received (self-medication and/or medical care provided by a general practitioner or a neurologist) may be associated with differences in the frequency of medication overuse headaches.MethodThis cross-sectional analytical study included 222 records of patients with chronic daily headaches seen at the National Institute of Neurological Sciences Outpatient Unit in Lima, Peru. A pre-designed questionnaire was used to assess and categorize patients with frequent and chronic headaches.ResultsNinety-four patients (42.34% of those with chronic daily headaches) met the criteria for medication overuse headache. Of these, 19 (28%) self-medicated, 22 (36%) consulted with the general practitioner, and the highest proportion of subjects, 53 (58%), consulted with a neurologist. On bivariate analysis, subjects who had received care from a general practitioner and self-medicated were 38% and 51% less likely to have MOH than the subjects whoreceived medical care from the neurologist (p=0.012; 95% CI 0.42-0.90 and p=0.001; 95% CI 0.32-0.74). On multivariate analysis adjusting by sociodemographic and clinical factors, the association remained significant in regards to self-medication, but became marginal (p=0.055) in regard to being seen by a general practitioner.ConclusionIn this study, the frequency of the headache due to overuse of medication was higher in patients attending a neurologist than those attending a general practitioner or self-medicated. This cross-sectional design cannot assess whether this reflects more severe cases looking for specialized care or more medication overuse headaches as a result of inappropriate management.

The Evolution of Medication Overuse Headache: History, Pathophysiology and Clinical Update

Medication overuse headache (MOH), the development or worsening of chronic headache resulting from frequent and excessive intake of medications used for acute treatment of headache, is a common secondary headache disorder and is associated with significant personal and societal burdens. The plausible physiologic mechanism is that chronic exposure to acute care migraine treatment leads to suppression of endogenous antinociceptive systems, consequently facilitating the trigeminal nociceptive process via up-regulation of the calcitonin gene-related peptide (CGRP) system. Recognizing and preventing its development is an integral aspect of migraine management, as medication overuse is a modifiable risk factor in the progression from episodic to chronic migraine. Over the years, MOH has been difficult to treat and has generated much controversy. Ongoing debates exist over the diagnostic criteria and treatment strategies, particularly regarding the roles of formal detoxification and preventive treatment. The arrival of the anti-CGRP monoclonal antibodies has also challenged our views of MOH and its treatment. This review outlines the evolution of MOH diagnostic criteria, presents the current understanding of MOH pathogenesis and discusses the debates over its development and treatment. Data on the efficacy of anti-CGRP monoclonal antibodies in the setting of medication overuse is also presented. These results indicate that patients with medication overuse, who are treated with these new medications, may not need to be detoxified in order to treat MOH. In light of these developments, it is likely that in the future MOH will be more readily diagnosed and treatment will result in better outcomes.