Introduction
To report the diagnostic yield of brain MRI and identify clinical associations of abnormal MRI findings among people with epilepsy (PWE) in a neurocysticercosis-endemic, resource-limited setting, and to identify the proportion and putative structural brain causes of drug resistant epilepsy cases.
Methods
PWE were prospectively enrolled at the Jigme Dorji Wangchuck National Referral Hospital in Bhutan (2014–2015). Each participant completed clinical questionnaires and a 1.5 tesla brain MRI. Each MRI was reviewed by at least one radiologist and neurologist in Bhutan and the U.S.A. A working definition of drug resistant epilepsy for resource-limited settings was given as (a) seizures for >1 year, (b) at least one seizure in the prior year, and (c) presently taking 2 or more antiepileptic drugs (AEDs). Logistic regression models were constructed to test the cross-sectional association of an abnormal brain MRI with clinical variables.
Results
217 participants [125 (57%) female; 54 (25%) <18 years old; 199 (92%) taking AEDs; 154 (71%) with a seizure in the prior year] were enrolled. There was a high prevalence of abnormal brain MRIs (176/217, 81%). Mesial temporal sclerosis was the most common finding (n=115, 53%, including 24 children), exceeding the number of PWE with neurocysticercosis (n=26, 12%, including one child) and congenital/perinatal abnormalities (n=29, 14%, including 14 children). The number of AEDs (odds ratio=0.59, p=0.03) and duration of epilepsy (odds ratio=1.11, p=0.02) were significantly associated with an abnormal MRI. Seizure in the prior month was associated with the presence of mesial temporal sclerosis (odds ratio=0.47, p=0.01). 25 (12%) participants met our definition of drug resistant epilepsy with mesial temporal sclerosis (n=10), congenital malformations (n=5), and neurocysticercosis (n=4) being the more frequent findings.
Conclusions
The prevalence of abnormalities on brain MRI for PWE in resource-limited settings is high due to a diffuse range of etiologies, most commonly mesial temporal sclerosis. Drug resistant epilepsy accounted for 12% of the referral population in a conservative estimation.