Recent Hospitalization and Initiation of Antiepileptics Among Persons With Alzheimer's Disease.

OBJECTIVES

Antiepileptic drugs (AEDs) are frequently prescribed for persons with Alzheimer's disease (AD), but little is known on factors associated with AED initiation in this population. We investigated whether recent hospitalization is associated with AED initiation in persons with AD.

DESIGN

Nested case-control study in the nationwide register-based Medication use and Alzheimer's disease (MEDALZ) cohort.

PARTICIPANTS AND SETTINGS: The MEDALZ cohort includes 70,718 persons diagnosed with AD during 2005-2011 in Finland. Altogether 6814 AED initiators and 6814 age-, sex-, and time since AD diagnosis-matched noninitiators were included in this study. Matching date was the date of AED initiation.

METHODS

AED purchases were identified from the Prescription Register and hospitalizations from the Care Register for Health Care. Recent hospitalization was defined as hospitalization ending within 2 weeks before the matching date. Association between recent hospitalization and AED initiation was assessed with conditional logistic regression.

RESULTS

The most frequently initiated AEDs were pregabalin (42.9%) and valproic acid (32.2%). A bigger proportion of AED initiators (36.9%) than noninitiators (5.3%) were recently hospitalized [odds ratio (OR) 10.5, 95% CI 9.22-11.9]. Dementia was the most frequent discharge diagnosis among AED initiators (29.1%) and noninitiators (27.9%). Among AED initiators, the next most frequent diagnosis was epilepsy (20.6%). Musculoskeletal diagnoses and use of analgesics including opioids was more common among gabapentinoid initiators compared with other AED initiators.

CONCLUSIONS AND IMPLICATIONS: Recent hospitalization was significantly related to AED initiation. Initiations of AED might have been related to common symptoms in persons with AD like neuropathic pain, epilepsy, and neuropsychiatric symptoms.