In this facility-based cross-sectional study lifetime prevalence of suicidality and non-fatal self-harm and its associated factors were assessed among people living with epilepsy. The study revealed that the magnitude of suicidality was higher as compared with facility-based studies done in high-income countries such as New York USA ideation (12–14%)(16). Although comparable results were seen in similar studies done in Egypt 23.5% (17), and a meta- Analysis on global lifetime prevalence 18% (95% CI: 14.2–22.7%) for suicidal ideation(18), as well as studies in Ethiopia ( 14.1%, 10.1%) for non-fatal self-harm behaviors(3, 19), there are variations in the magnitude of suicidality between studies. This discrepancy could be due to sampling design, study participants, or incidence of risk factors.
The presence of depression was strongly associated with people with epilepsy, which is consistent in various studies done globally(19–21). The explanation proposed for the increased risk of depression among PWE is various; 1) profound perceived stigma of epilepsy leads to psychological distress, 2) bidirectional causation between suicidality, depression, and seizures explained that one causes the other or vice versa (ie seizure alone may be a single risk factor for depression and suicidality or depression and suicidality may increase the risk for new seizure) (6). In this study, a strict cutoff score (10 or more) of PHQ-9 was used to assess depression which resulted in a magnitude of 27% among PWE. Similar studies showed comparable results(22, 23). In addition to this people with poor social support were associated with a higher rate of suicidality and non-fatal self-harm behaviors. This is consistent with studies done in New Zealand (31%). Despite the strong association between poor social support and suicidality, cultural and ethnic differences, as well as study designs, could contribute to the discrepancy in the magnitude of the association (18, 23, 24). In Ethiopia possible social factors that trigger suicidality could be family disputes, financial problems, stigma, and discrimination(2).
The association between married PWE and suicide attempts was inconsistent with other studies. Despite these very few studies were done in rural Ethiopia (22) and the Sodo region of Ethiopia (25), as well as a Korean study (p = 0.001) (26), which showed a similar association. The possible explanation can be a rising marital dispute either because of direct stigma and discrimination from spouses or less proportion of PWE to get married as compared to the general population. However, this theory needs further study to reach on conclusion.
Methods used to attempt suicide were also consistent with other studies. Poisoning using chemicals or AED was the most common method used in Asian studies(30) and New Zealand studies(24). Similarly, in a study done in South Africa, 44% (26), and Indian 93.1% (27) of youths and adolescents also show self-poisoning was the predominant method followed by hanging. However, studies done in Europe (28) and western nations(29) identify completed suicide or attempt is mostly carried out by hanging or using sharp objects/rifles. Such differences in the method could be due to accessibility of the method, knowledge of how to use it, and cultural acceptability.
In our study, Generalized-tonic clonic seizure was the most diagnosed type of epilepsy (78.6%). Other studies done in Ethiopia also showed a similar magnitude (77.6%- 93.0% ) (20, 22). The possible explanation for this is that any convulsive type of seizure with loss of consciousness can be given an automatic diagnosis of GTC by clinicians, underdiagnosing other focal seizures with discognitive features. The other explanation could be because of the skill gap in the diagnosis and lack of investigating modalities such as EEG. Our result also showed those diagnosed with GTC type of epilepsy had a significant association in both suicidal ideation and plan as compared to focal seizure types. This is a rather inconsistent association as compared with other studies done in western nations. One review study highlights that suicidality is increased by 6–25 fold for TLE/ a type of focal seizure/ than GTC type of epilepsy (12). Other studies however didn’t find any association between the types of seizures (13, 30). The possible explanation for this could be the presence of a common mechanism of pathogenesis between suicide, depression, and epilepsy types (13)
Regarding the duration of epilepsy, our result showed a significant association with a suicidal plan. This is consistent with other studies where the risk of self-harm is increased in the two years of epilepsy diagnosis (IRR, 3.1– 4.5) (10). Despite this other studies done in Japan (31) and Ethiopia (22) didn’t show any significant association. This could be because of the complex behavior in the association between Suicidality and epilepsy per se. Apart from this most studies didn’t find any association between factors such as the early onset of epilepsy and duration of AED use that is consistent with this study (3, 20).
Different studies indicate that people who are taking 2 or more AED are at increased risk of suicidality and non-fatal self-harm behaviors. A study done in England showed an increased risk of suicidality for two AED with (OR 1.84, 95% CI 1.33–2.55) or three or more AEDs (OR 2.44, 95% CI 1.51–3.94) (10, 23). similarly, trials on 11 types of AEDs from a pharmaceutical company on 28 000 patients showed a risk increase by almost 2 times (OR 1.8 95% CI, 1.24–2.66) (6, 32).