Identification and characterization of migraine in pregnancy: A Norwegian registry-based cohort study

Mitter, Vera; Lupattelli, Angela; Bjørk, Marte-Helene; Nordeng, Hedvig M.E. (2024). Identification and characterization of migraine in pregnancy: A Norwegian registry-based cohort study Cephalalgia, 44(4) Sage 10.1177/03331024241248846

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Background: Migraine is common in women of reproductive age. Migraine’s episodic manifestation and acute and preventive pharmacological treatment options challenge studying drug safety for this condition during pregnancy. To improve such studies, we aimed to develop algorithms to identify and characterize migraines in electronic healthcare registries and to assess the level of care. Methods: We linked four registries to detect pregnancies from 2009–2018 and used three algorithms for migraine identification: i) diagnostic codes, ii) triptans dispensed, and iii) a combination of both. We assessed migraine severity using dispensed drugs as proxies. ICD-10 diagnostic subcodes of migraine (G43) allowed the allocation of four subtypes: complicated and/or status migrainosus; with aura; without aura; other/unspecified. Results: We included 535,089 pregnancies in 367,908 women with available one-year lookback. The prevalence of migraines identified was 2.9%–4.3% before, and 0.8%–1.5% during pregnancy, depending on algorithm used. Pregnant women with migraine were mostly managed in primary care. Conclusions: Primary care data in combination with drug dispensation records were instrumental for identification of migraine in electronic healthcare registries. Data from secondary care and drug dispensations allow better characterization of migraines. Jointly, these algorithms may contribute to improved perinatal pharmacoepidemiological studies in this population by addressing confounding by maternal migraine indication.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Health Professions School of Health Professions > Midwifery
Name:	Mitter, Vera0000-0002-1483-5020; Lupattelli, Angela; Bjørk, Marte-Helene and Nordeng, Hedvig M.E.
Subjects:	R Medicine > RG Gynecology and obstetrics
ISSN:	0333-1024
Publisher:	Sage
Language:	English
Submitter:	Jean Anthony Grand-Guillaume-Perrenoud
Date Deposited:	01 May 2024 09:35
Last Modified:	07 May 2024 16:47
Publisher DOI:	10.1177/03331024241248846
ARBOR DOI:	10.24451/arbor.21817
URI:	https://arbor.bfh.ch/id/eprint/21817