Keene et al. [33]
Elliot et al. [35]
Puka and Smith [37]
QOLIE-31/QOLCE
Total score
A
A
A
QOL item
–
n.s
A
Cognitive function
A
A
n.s
Energy/fatigue
A
n.s
n.s
Social functioning
A
Aa
A
Emotional functioning
A
n.s
n.s
Seizure worry
A
B
A, C
Medication effects
A
n.s
C
Health perception
–
–
A
SHE
Self-perception
–
A
–
Physical
–
B
–
Life satisfaction
–
n.s
–
Additionally, surgical patients, independent of seizure status, showed significantly better scores in the seizure worry and medication effects subscales. AED use was independently associated with lower scores on the social functioning subscale; other variables – number of years of follow-up and IQ – were not significantly predictive of any QOL domain.
Overall, studies of long-term QOL outcomes following pediatric epilepsy surgery find significant improvements associated with seizure freedom in most QOL domains, although there is variability as to which domains do improve. Of the long-term follow-up studies, few have restricted the follow-up period to at least 2 years; an important factor as QOL may increase rapidly during the first 6 months to 2 years following surgery and plateau with time [20, 24]. Additionally, few studies have compared surgical and nonsurgical patients, and only one has compared pre- and postoperative ratings of QOL. In evaluating the long-term QOL outcomes following pediatric epilepsy surgery, future studies should address these gaps and evaluate key variables that may lead to improved QOL (See Appendix).
What Influences QOL Outcome in Addition to Seizure Control?
Comprehensive models of QOL in childhood epilepsy have been proposed, largely out of recognition that seizure control alone does not completely explain the experience of QOL [12, 20, 21, 39]. These models address the impact of a number of variables, such as those associated with seizures (e.g., duration of epilepsy, age of onset, medication), child variables (e.g., behavior, cognition, psychosocial function), family variables (e.g., family function, stress, maternal anxiety/depression), and community variables (school, availability of social support, the health system). To date, none of the studies on outcome after epilepsy surgery have utilized such a comprehensive model. Although studies have consistently examined at least a subset of the seizure-related variables, only a few have examined the impact of the other categories of variables, specifically the impact of patient affective symptoms. This variable is particularly important, as research has shown that young adults who have undergone surgery in childhood continue to experience psychological distress, even in those who are seizure-free [40]. Significant associations with mood and affective symptoms with QOL have also been demonstrated in the literature on surgery in adulthood [41–44].
The study by Elliott et al. [35] was the first among pediatric long-term outcome studies to incorporate patients’ mood, as measured by the Profile of Mood States [45], which assesses anxiety, depression, anger, energy, and confusion. Mood was significantly and independently predictive of 8 out of the 10 QOL subscales examined (QOLIE-31 total score, overall QOL rating, cognitive function, energy/fatigue, emotional functioning, and the SHE self-perception, physical and life satisfaction scales). More recently, Puka and Smith [37] examined the relationship between QOL and affective symptoms, as measured by the internalizing behavior summary score of the Adult- and Child- Behaviour Checklist [46, 47]. A mediation analysis was utilized to determine whether the commonly reported association between seizure freedom and QOL is determined by a third variable, the presence of affective symptoms, such that seizure freedom does not directly affect QOL but it leads to an improvement in affective symptoms which in turn leads to an improvement in QOL ratings. A mediating effect of affective symptoms was significant for all subscales examined: overall QOL, QOL item, cognitive functioning, energy/fatigue, and emotional functioning, social functioning, and health perception. Such findings emphasize the integral role of affective symptoms on QOL in patients with childhood-onset epilepsy.
Psychosocial Outcomes
Due to the high rate of comorbidities, children with epilepsy may experience challenges in a number of domains of psychosocial function, including emotional and behavioral disorders, compromised social behaviors and experiences, and limitations on their educational and vocational opportunities. Many of these topics are discussed in depth in other chapters in this book; thus, our discussion here concentrates mainly on the social realm.
Long-Term Psychosocial Outcomes Without Surgery
Patients with pediatric-onset epilepsy show residual social difficulties in adulthood that remain despite good seizure outcomes. Following a Japanese cohort of 148 patients with childhood-onset epilepsy over 6–37.5 years (mean 19 years), Wakamoto et al. [48] found lower rates of marriage, education, and employment, despite the fact that 63 % of patients were in remission. However, when examining patients with normal intelligence, the education and employment differences were no longer significant. Similarly, a group of patients from Finland followed for >30 years had worse social and educational outcomes in comparison to healthy controls, and patients not in remission were at high risk of having lower socioeconomic status [8, 27, 49]. Patients were also less likely to be married, to live with someone, or to have children. However, patients with “epilepsy-only” had better outcomes in each measure relative to patients with epilepsy and other disabilities, although they were more likely than controls to feel lonely and to have lower perceived control over their lives. Additionally, “epilepsy-only” patients taking multiple AEDs reported lower life satisfaction and poorer health relative to controls. Other studies of long-term psychosocial outcomes reveal similar results [50, 51]. It is also important to note that these adverse social situations remained even in patients who entered adulthood seizure- and medication-free.
Given the persistence of social problems among individuals with childhood-onset epilepsy, an important question is whether surgery and associated seizure outcomes have an impact on social outcomes. To date, there has been little research to address this question.
Long-Term Psychosocial Outcomes Following Surgery
Hum et al. [52] found that 1.5–3.4 years (mean 2.4 years) following surgery, youth with persistent seizures did not report an improvement in their social function, whereas mixed results were found among seizure-free patients. Those who reported improvements commented on the contribution of their decreased fear of having seizures, their perception of feeling normal and increased autonomy (less parental monitoring). Those with continued peer difficulties reported on the lingering stigma and discrimination associated with epilepsy. Similarly, Park et al. [53] found that social adaptation, assessed by the number of intimate friends, was significantly associated with seizure control and school performance 1–5.3 years (mean 3.2) years postsurgery.
Lach et al. [38] utilized various subscales of the QOLIE-31 and SHE to examine the psychosocial outcomes of 71 surgical patients and a control group of 31 nonsurgical patients with active seizures, a minimum of 2 years (mean: 8.86, SD: 4.93) following surgery. General social well-being was found to be significantly better in surgical seizure-free patients compared with patients with active seizures. Additionally, surgical seizure-free patients were less likely to report the perception that their epilepsy posed a handicap in social and personal functioning, and had better scores pertaining to work and activities. The groups did not differ in the number of friends they had, the number of times they had contact with friends on a weekly basis, how well they knew their neighbors, or in their principal activity (i.e., student, employed or unemployed). However, the surgical seizure-free patients were more likely to be involved in a romantic relationship, to have taken a recent extended trip with friends, and to belong to community clubs or organizations.
Keene et al. [54] also found that at least 2 years after surgery (mean 7.6 years, SD 3.8 years) better social outcomes were associated with a greater than 50 % reduction in seizure frequency; such patients were more likely to have stable relationships, be financially independent, and have a higher level of education. This relationship was only significant when patients under the age of 18 (n = 20) were excluded from the analysis. Interestingly, correlating the social outcome of financial independence, level of employment, and marital/relationship status with ratings of improved QOL (reported in [33]) did not yield significant results, suggesting that patients’ reports of improved QOL may not translate to improved social and socioeconomic status.
Similar to the long-term QOL outcomes, overall social functioning improves following pediatric epilepsy surgery. When evident, improvements in social functioning have been associated with seizure freedom or reduction. However, improvements are not seen in all domains even in seizure-free patients and different studies find different areas that improve and areas that remain diminished in the long term. Where social functioning remains diminished, lingering stigma and discrimination have been reported. It is also important to note, that the few studies that have examined long-term social outcomes have not explored the relationship between social outcomes and various family variables (e.g., family function, stress) and child variables (e.g., affective symptoms).
Conclusions and Future Directions
This chapter reveals that QOL and psychosocial function improve in individuals who obtain seizure freedom after epilepsy surgery in childhood. Given that improvements have been associated with seizure freedom in individuals who have not undergone surgery, surgical status itself appears to have little effect on QOL and psychosocial outcomes. The QOL and psychosocial domains that improve in the long-term remain unclear, reflecting the complex nature of such outcomes.
A number of questions await further investigation. Research shows that the QOL trajectories after seizure onset vary, and this situation is likely to be the case after surgery as well. Such trajectories have not yet been explored. To date, few studies have systematically examined long-term outcomes, and the influence of time since surgery, age at surgery, and age at follow-up. The influence of other variables (such as child and family variables), shown or hypothesized to be related to QOL outcomes, await research in pediatric surgical samples. We do know that perception of QOL after surgery is highly influenced by mood or affective state. It is of the utmost importance to not only treat epileptic seizures as early as possible to but to provide support with the social and emotional challenges that arise during childhood, adolescence, and with the transition into adulthood. Strong social support and coping strategies to overcome epilepsy-specific and emotional difficulties may be essential in attaining improved psychosocial and QOL outcomes into adulthood.
Appendix. Summary of Long-Term (≥2 years) Studies of Quality of Life and Psychosocial Outcomes in Children After Epilepsy Surgery
Author, year | Study design | Participants† (children) N | Surgical N | Males | Age (yr) at surgery (min-max) | % life (yr) with epilepsy | Prognostic indicators studied | Intervention | Seizure outcome measure | Seizure-free N | Follow-up (min-max/years) |
---|---|---|---|---|---|---|---|---|---|---|---|
Keene et al. [33] | CS | 64 (20) | 64 | 39 | 12.2 (4.8)** | NS | a,b | T-EXT | B | 35 | 7.6 (3.8)** 2 – NS |
Keene et al. [54] | CS
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