Anticonvulsant blood levels: historical review with a pediatric focus

Adherence to anti-seizure medications and associated factors among children with epilepsy at tertiary Hospital in Southwest Ethiopia: a cross-sectional study

Background

Childhood epilepsy causes a tremendous burden for the child, the family, society as well as the healthcare system. Adherence to anti-seizure medications (ASMs) is a key to treatment success. Poor adherence has been considered as one of the main causes of unsuccessful treatment for epilepsy and presents a potential ongoing challenge for achieving a key therapeutic goal of seizure control.

Methods

A facility-based cross-sectional study design was conducted among children with epilepsy attending the Pediatrics neurology follow up clinic of Jimma Medical Center from June- 21 to September- 20, 2021. Data were collected by using a semi-structured pre-tested questionnaire. Epidata version 3.1 and SPSS version 26.0 were used for data entry and analysis respectively. Descriptive statistics and binary logistic regression analysis were employed. Adjusted odds ratios were used to ascertain effect sizes for any association between the dependent and associated variables while significance level at p-value of < 0.05 was determined using 95% confidence intervals.

Result

A total of 170 children with epilepsy were included in this study. About 54.7% were male and 44.7% were in age range of 10–17 years. The overall adherence to anti-seizure medications was 54.1%. Those caregivers who were married [AOR = 7.46 (95% CI = 1.46, 38.20)], those children with controlled seizure status [AOR = 3.64 (95% CI = 1.51, 8.78)], those who got appropriate health care [AOR = 7.08(95% CI = 2.91, 17.24)], those caregivers who had good knowledge [AOR = 5.20(95% CI = 2.60,14.83)]; and positive attitude [AOR = 2.57 (95% CI = 1.06, 6.28)] towards epilepsy were significantly associated with adherence to anti-seizure medications.

Conclusions

More than half of the children/adolescents having epilepsy were adherent to their anti-seizure medication(s). Children’s adherence to anti- seizure medications was influenced by current marital status of the parents/caregivers, controlled seizure status, getting appropriate healthcare in the hospital, caregiver’s knowledge; and attitude towards epilepsy. More efforts are required to scale up the provision of client-centered service (provision of appropriate health care delivery, focus on quality of treatment and providing health education/counseling to improve caregivers’ knowledge and attitude towards epilepsy) to improve children’s adherence status to their medication(s) and seizure control status.

Intelligence quotient (IQ) among children with epilepsy: National epidemiological study - Sudan

BACKGROUND

Many studies of selected groups of children with epilepsy have demonstrated an association between epilepsy and cognitive deficits. The aim of this study was to assess the intellectual skills of children with epilepsy and to investigate the influence of gender, age at seizure onset, type of epilepsy, antiepileptic drug used, and control of epilepsy on their intellectual function.

METHODS

This is a descriptive prospective study in which one hundred and eighty-seven patients at school age (6-14 years) were recruited. Epilepsy was classified using the International League Against Epilepsy (ILAE) Commission on Classification and Terminology 2005-2009 report. An intelligence quotient (IQ) test was conducted to all patients using Stanford-Binet Fifth Edition (SB5)/Arabic version.

RESULTS

Eighty-eight (47.1%) patients had an average score on Full Scale IQ (FSIQ), 44 (23.5%) had low average, whereas 18 (9.6%) had borderline impaired or delayed score. In the nonverbal IQ (NVIQ) score, the majority 84 (44.9%) had average score. The performance of the patients in the nonverbal score is better than in the verbal score, which was found to be statistically significant (P-value = 0.01). The FSIQ score was negatively affected by younger age at onset of epilepsy, polytherapy, and uncontrolled seizures.

CONCLUSIONS

Most of children with epilepsy had an average FSIQ; uncontrolled seizure had worse effect on overall FSIQ and memory. Interventions to support children with epilepsy should focus on epilepsy management and school psychosocial domains.

Adherence to antiepileptic drugs in children with epilepsy in a Scottish population cohort

AIM

To measure the adherence to antiepileptic drugs (AED) in a population cohort of children with epilepsy and to study the relationship between adherence and a series of clinical variables.

METHOD

A population-based study of children (<16y) with epilepsy on AED treatment from the Tayside region of Scotland during two epochs of 12 months each. A clinical database was constructed using hospital records and linked to a community dispensing pharmacy database to calculate an Adherence Index. The principal outcome measure was the measurement of population-based adherence to AEDs. Secondary outcome measures were the association of adherence with the clinical characteristics of the population.

RESULTS

The median age of study group was 10 years and the median duration of epilepsy was 4 years. Only 30.9% of the total 320 children adhered to recommended AED treatment (Adherence Index >90%) across a year of treatment. Twenty-five percent of children had an Adherence Index of less than 50%. Adherence declined with increasing age. There was no significant correlation between adherence and other clinical characteristics studied (sex, duration of epilepsy, other comorbid health problems, other regular medications, and seizure frequency).

INTERPRETATION

Our data shows adherence to AED treatment is poor in children with epilepsy.

Vigabatrin pediatric dosing information for refractory complex partial seizures: results from a population dose-response analysis

We predicted vigabatrin dosages for adjunctive therapy for pediatric patients with refractory complex partial seizures (rCPS) that would produce efficacy comparable to that observed for approved adult dosages. A dose-response model related seizure-count data to vigabatrin dosage to identify dosages for pediatric rCPS patients. Seizure-count data were obtained from three pediatric and two adult rCPS clinical trials. Dosages were predicted for oral solution and tablet formulations. Predicted oral solution dosages to achieve efficacy comparable to that of a 1 g/day adult dosage were 350 and 450 mg/day for patients with body weight ranges 10-15 and >15-20 kg, respectively. Predicted oral solution dosages for efficacy comparable to a 3 g/day adult dosage were 1,050 and 1,300 mg/day for weight ranges 10-15 and >15-20 kg, respectively. Predicted tablet dosage for efficacy comparable to a 1 g/day adult dosage was 500 mg/day for weight ranges 25-60 kg. Predicted tablet dosage for efficacy comparable to a 3 g/day adult dosage was 2,000 mg for weight ranges 25-60 kg. Vigabatrin dosages were identified for pediatric rCPS patients with body weights ≥10 kg.

Identification and prevention of antiepileptic drug noncompliance: the collaborative use of state-supplied pharmaceutical data

Background. Antiepileptic drugs (AEDs) noncompliance is associated with increased risk of seizures and morbidity in seizure disorder patients. Objective. To identify risk factors that correlated to higher levels of morbidity, measured by emergency room (ER) utilization by seizure disorder members taking AED. Methods. Patients with primary or secondary diagnosis of seizures, convulsions, and/or epilepsy and prescribed AEDs during an 11-month period were included in the study. Variables were analyzed using multivariate statistical analysis including logistic regression. Results. The study identified 201 members. No statistical significance (NS) between age, gender, number of tablets, type of drug, or other risk factors was associated with increased mortality. Statistical significance resulted with medication compliance review of 0–14 days, 15–60 days, and 61+ days between refills. 68% of patients with ER visit had noncompliance refill between 0 and 14 days compared to 52% of patients in non-ER group (P = 0.04). Contrastingly, 15% of ER group had refills within 15–60 days compared with 33% of non-ER group (P = 0.01). There was NS difference between two groups when noncompliance was greater than 60 days (P = 0.66). Conclusions. The study suggests that careful monitoring of pharmaceutical refill information could be used to identify AED noncompliance in epileptic patients.

Pharmacokinetic-pharmacodynamic assessment of topiramate dosing regimens for children with epilepsy 2 to <10 years of age

PURPOSE

To identify and validate the efficacious monotherapy dosing regimen for topiramate in children aged 2 to <10 years with newly diagnosed epilepsy using pharmacokinetic-pharmacodynamic (PK-PD) modeling and simulation bridging.

METHODS

Several models were developed in pediatric and adult populations to relate steady-state trough plasma concentrations (C(min)) of topiramate to the magnitude of clinical effect in monotherapy and adjunctive settings. These models were integrated to derive and support the monotherapy dosing regimen for pediatric patients.

KEY FINDINGS

A two-compartmental population PK model with first-order absorption described the time course of topiramate C(min) as a function of dosing regimen. Disposition of topiramate was related to age, body weight, and use of various concomitant antiepileptic drugs. The PK-PD model for monotherapy indicated that the hazard of time to first seizure decreased with increasing C(min) and time since randomization. Higher baseline seizure frequency increased risk for seizures. Age did not significantly influence hazard of time to first seizure after randomization to monotherapy. For adjunctive therapy, the distribution of drug and placebo responses was not significantly different among age groups. Based on the available PK-PD modeling data, the dosing regimen expected to achieve a 65-75% seizure freedom rate after 1 year for pediatric patients age 2-10 years is approximately 6-9 mg/kg per day.

SIGNIFICANCE

This analysis indicated no difference in PK-PD of topiramate between adult and pediatric patients. Effects of indication and body weight on PK were adequately integrated into the model, and monotherapy dosing regimens were identified for children 2-10 years of age.