A recent study, published in the March 2024 issue of Sleep Medicine, identified shift work as one of the risk factors for headache and migraine. The researchers conducted a meta-analysis, including seven studies and involving 422,869 participants. The authors defined shift work as characterized by individuals or teams working consecutively to exceed the standard 8-hour day. They reported that the pooled analysis revealed a significant association between shift work and an increased risk for headache. Specifically, they determined that "individuals working night shifts had a 44% higher risk of developing headaches and a higher incidence of migraines." The authors stated that this association did not establish any causal relationship, and they suggested that future research should investigate the impact of genetics or health behaviors, which could be considered shared risk factors.
An article that had been published in 2019 in Headache included two case reports detailing the effects of shift work on patients with migraine. The authors of the case reports stated that "in the two cases presented, shift work appeared to be associated with chronification of migraine and higher headache-related disability, despite optimal headache management and good patient adherence."[1] They observed that "a switch to only day shifts promoted transition to an episodic, less disabling pattern of migraine."[1] These publications both support the idea that, while patients may have an underlying predisposition to migraine, certain lifestyle factors can play a role in exacerbating symptoms.
Erenumab, one of the relatively new therapies for migraine, was found to have a potential link to worsening hypertension. According to an article published in February in Headache: The Journal of Head and Face Pain, there has not been evidence of hypertension in preclinical models or clinical trials, yet postmarketing data suggest that erenumab may be associated with hypertension. The authors conducted an observational retrospective cohort study that included 335 patients who had been seen at a tertiary headache or neurology department. At baseline, 20.9% (70/335) of patients had a prior diagnosis of hypertension. The researchers observed that 23.3% (78/335) of the patients were found to have worsening hypertension, and 13 patients of the 225 who continued on erenumab experienced an improvement in their blood pressure. The authors noted that there was no association between worsening hypertension and preexisting hypertension, sex, body mass index, or age, but patients with atrial fibrillation were more likely to develop worsening hypertension (odds ratio 4.9; 95% CI 1.12-21.4; P = .035).
Consideration of a relationship between hypertension and anti-calcitonin gene–related peptide migraine (CGRP) therapies has been found in other studies as well. Results of a retrospective study conducted at the University Hospital of Modena, to explore the rate of hypertension among patients treated with anti-CGRP monoclonal antibodies, were published in April 2024 in Neurological Sciences (published online November 6, 2023). Those authors reported that no significant increase in blood pressure was detected overall, yet 5.7% of the patients developed a significant increase in their blood pressure.[2] Specifically, the researchers reported that patients with preexisting hypertension were more likely to have a significant increase in blood pressure.[2] The study authors of the Neurological Sciences publication suggested that patients with preexisting hypertension should be cautiously monitored for signs of hypertension. A more recent publication noted that "CGRP is involved in the regulation of vasomotor tone under physiologic and pathologic conditions, including hypertension," which could explain these findings. As the two studies noted different underlying risk factors for hypertension for patients taking anti-CGRP migraine therapies, it is important to monitor patients for signs of hypertension regardless of their underlying cardiovascular status.
Migraine was also noted to potentially be associated with an increased risk for cerebrovascular disease and stroke among women who have underlying cardiovascular disease risk factors. According to a cross-sectional analysis whose results were published in Mayo Clinic Proceedings in May 2023, women with migraine were significantly more likely to have severe hot flashes compared with women without migraine.[3] Additionally, the authors stated that migraine was associated with a diagnosis of hypertension.[3]
Results of a secondary data analysis of a subset of 1954 women in the Coronary Artery Risk Development in Young Adults (CARDIA) study were published in the April 2024 issue of Menopause. After adjustment for age, race, estrogen use, oophorectomy, and hysterectomy, women with histories of migraine and persistent vasomotor symptoms were found to have a greater risk for cerebrovascular disease (hazard ratio [HR] 2.25; 95% CI 1.15-4.38), and stroke (HR 3.15; 95% CI 1.35-7.34), compared with women without migraine histories and with minimal vasomotor symptoms. After adjustment for cerebrovascular disease risk factors, the associations between migraine/vasomotor symptoms and cerebrovascular disease were attenuated (HR 1.51; 95% CI 0.73-3.10), and associations between migraine/vasomotor symptoms and stroke were similarly attenuated (HR 1.70; 95% CI 0.66-4.38). The authors of this research article concluded that migraine and persistent vasomotor symptoms are jointly associated with greater risk for cerebrovascular disease and stroke, particularly for women who already have traditional risk factors for cerebrovascular disease.
This new research brings the importance of managing migraine risk factors and symptoms to the forefront. Patients who experience migraine may have a higher risk for cerebrovascular disease. Minimizing migraine risk factors could potentially help reduce this risk for cerebrovascular disease for some patients, and effectively treating migraines may also play a role in reducing the risk for cerebrovascular disease. Some migraine therapies could worsen cardiovascular disease for some patients, however — particularly patients who already have underlying risk factors. Therefore, it is crucial for physicians to approach migraine care with a comprehensive strategy to reduce risk factors, assess underlying disease, and monitor for comorbidities.
Additional References
1. Sandoe CH, Sasikumar S, Lay C, Lawler V. The impact of shift work on migraine: A case series and narrative review. Headache. 2019;59:1631-1640. doi: 10.1111/head.13622 Source
2. Guerzoni S, Castro FL, Brovia D, Baraldi C, Pani L. Evaluation of the risk of hypertension in patients treated with anti-CGRP monoclonal antibodies in a real-life study. Neurol Sci. 2024;45:1661-1668. doi: 10.1007/s10072-023-07167-z Source
3. Faubion SS, Smith T, Thielen J, et al. Association of migraine and vasomotor symptoms. Mayo Clin Proc. 2023;98:701-712. doi: 10.1016/j.mayocp.2023.01.010 Source