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Relationship of carbamazepine reduction rate to seizure frequency during inpatient telemetry
B A Malow1, B Lynch, T A Blaxton
1Department of Neurology, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02155.
Insights
Rapid carbamazepine (CBZ) reduction during inpatient telemetry is safe for children and young adults with refractory partial seizures. Faster dose reduction effectively promotes seizure recordings without increasing risks like status epilepticus.
Area of Science:
- Neurology
- Clinical Pharmacology
Background:
- Refractory partial seizures require careful management, especially during diagnostic procedures.
- Inpatient video/EEG telemetry is crucial for evaluating seizure frequency and guiding treatment adjustments.
Purpose of the Study:
- To establish guidelines for medication reduction during inpatient telemetry.
- To assess the safety and efficacy of carbamazepine (CBZ) dose reduction rates in pediatric and young adult patients with refractory partial seizures.
Main Methods:
- Retrospective review of 18 pediatric and young adult patients undergoing CBZ reduction during continuous video/EEG telemetry.
- Analysis of seizure rates, dose reduction percentages, and CBZ levels in relation to taper speed.
Main Results:
- Despite a mean 44% CBZ dose reduction by day 2, no patients experienced frequent repetitive seizures or status epilepticus (SE).
- Seizure rate during CBZ reduction correlated significantly with the rate of drug reduction, with the third seizure occurring around 79% dose reduction.
- CBZ level reduction also correlated significantly with seizure rate.
Conclusions:
- Manipulation of CBZ dose reduction rate is important for maximizing seizure frequency during telemetry.
- A relatively rapid rate of CBZ dose reduction was found to be safe and effective in promoting seizure recordings in this patient group.
Abstract:
To establish guidelines for medication reduction during inpatient telemetry, the records of 18 children and young adults with refractory partial seizures undergoing carbamazepine (CBZ) reductions during continuous video/EEG telemetry were reviewed. Six patients were receiving CBZ monotherapy, and 12 patients were treated with an additional antiepileptic drug (AED) maintained at baseline dosage during CBZ taper. Despite relatively rapid mean reductions in dosage of 44% by day 2 of taper, no patients experienced frequent repetitive seizures or status epilepticus (SE). Seizure rate during the entire CBZ reduction period correlated significantly with rate of drug reduction. Linear regression analysis showed drug reduction rate to be a good predictor of seizure rate. Fourteen patients experienced at least three seizures during CBZ taper. On the average, the third seizure occurred on day 5 of taper at a percentage of dose reduction of 79%. In 8 patients, CBZ concentrations were measured both before taper and < or = 24 h after the third seizure. For these patients, seizure rate also correlated significantly with reduction in CBZ level. We conclude that manipulation of CBZ dose reduction rate is important in maximizing seizure frequency during telemetry and, in our patients, a relatively rapid rate of dose reduction was safe and effective in promoting seizure recordings.