[Epidemiology and associated factors with depression among people suffering from epilepsy: A transversal French study...

The occurrence of depression in people with epilepsy is almost twice as common as in the general population. Furthermore, depression is the first cause of lower quality of life among those patients. Which is why the main goal of this study was to assess the epidemiology of depression and its associated factors among the patients from the tertiary department of epileptology in Rennes.

The subjects were included prospectively and consecutively at the moment of their consultation or hospitalisation in the department. Personal data about the socio-economic status and the type of epilepsy was collected. The subjects filled validated self-assessment of depression (NDDIE), anxiety (GAD-7) and quality of life (QOLIE-10). Thanks to the NDDIE, the patients were divided into: "depressed" and "not depressed"; and the two groups were compared with univariate and multivariate models. Of the 322 patients followed-up in the department between the 17th of June and the 9th of September 2016 223 of them were included in the study. According to the NDDIE, 22.6% suffered from depression; according to the GAD-7, 46.4% suffered from anxiety. In the "depressed" group, 82% were not under anti-depressant medication. In the univariate model, depression was associated with: anxiety, suicidal ideations, lower quality of life, vague nervus stimulation treatment, anticonvulsant benzodiazepine medication or psychiatric medication, and last of all bitherapy or polytherapy antiepileptic medication compared to monotherapy. In the multivariate model, depression was significantly related to anxiety (OR: 8.86 [3.00; 26.19] p=0.0001), suicidal ideas (OR: 7.43 [2.93; 18.81] p<0.0001), anticonvulsant benzodiazepine medication (OR: 3.31 [1.16; 9.49] p=0.0255), and lower quality of life (OR: 1.09 [1.02; 1.17] p=0.0087). Generalised epilepsy was a protective factor with uni and multivariate models (OR: 0.34 [0.11; 1.00] p=0.0492).

In the tertiary epileptic department of Rennes, more than 20% of patients with epilepsy suffered from depression during the inclusion period according to the NDDIE. Among those "depressed" subjects, fewer than one out of five seemed to receive proper psychiatric care. Which is why this study highlights the importance of interdisciplinary cooperation between neurologists and psychiatrists in order to aim at better management of epileptic patients as a whole.