Clinical trial NCT01320670: Neuroimaging Predictors of Treatment Failure in Adult New-onset Epilepsy
Official title: Neuroimaging Predictors of Treatment Failure in Adult New-onset Epilepsy
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Epilepsy
Seizures
Keywords: pharmacoresistance
Lead sponsor: Nova Scotia Health Authority
Sponsor class: OTHER
Collaborators: name: Nova Scotia Health Research Foundation
First posted: 2011-03-22
Enrollment: 50
Sex: ALL
Minimum age (years): 17
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patients with first seizure or new-onset epilepsy aged \> 17 years

Brief summary: Epilepsy, defined as recurrent, unprovoked seizures, is a common condition, affecting 0.5-1% of the general population. People with uncontrolled epilepsy suffer poor health and increased mortality due to their condition. They frequently experience social stigma and are socioeconomically disadvantaged. It is therefore imperative to help them gain control of their seizures as quickly as possible. A wide range of antiepileptic drugs (AEDs) has become available to treat people with epilepsy. However, despite maximal therapy, approximately 20-40% show pharmacoresistance (PR) and thus continue to have seizures.

We do not understand why a significant proportion of people with epilepsy have PR. For any given patient presenting with a first unprovoked seizure, we are unable to predict PR at the time of presentation. At least 2 different AEDs must be tried at maximum doses for a year before we can diagnose PR. At this point, surgical therapies become an increasingly urgent consideration.

Retrospective magnetic resonance imaging (MRI) studies in the chronic stages of epilepsy have shown that patients with PR are more likely to have focal structural lesions in the brain, and in particular to have signs of damage to the hippocampi. For example, there are retrospective data suggesting that a decreased hippocampal N-acetylaspartate (NAA)/creatine ratio (measured by magnetic resonance spectroscopy \[MRS\]) and hippocampal atrophy (determined by hippocampal volumetry) correlate with PR. However, it is not clear whether these findings reflect the underlying pathophysiology of PR, or simply reflect the effects of chronic seizures and chronic drug treatment on the brain.

The First Seizure Clinic at the Halifax Infirmary represents a unique opportunity for prospective, longitudinal studies of patients who present with a first seizure or with newly diagnosed epilepsy. In these patients, advanced neuroimaging techniques at presentation might show changes that truly reflect the underlying pathophysiology of PR, rather than changes that develop as a consequence of prolonged seizures and drug treatment. Neuroimaging follow-up might help us to understand the pathophysiologic changes that accompany the evolution of PR. Ultimately, it is our hope to combine neuroimaging features and clinical features of patients with PR in a predictive model that would help us to predict PR at presentation.


Eligibility criteria: Inclusion Criteria:

* Age 17 years
* Newly diagnosed epilepsy or history of first unprovoked, witnessed seizure

Exclusion Criteria:

* Lack of consent provoked seizure due to obvious
* Acute lesion on CT (e.g. stroke, hemorrhage
* Provoked seizure due to obvious, chronic lesion on CT (e.g. vascular malformation, tumour)
* Progressive brain disease (e.g. neoplastic, infectious, demyelinating diseases)
* History of epilepsy longer than 1 year at presentation to FSC
* History of AED treatment for more than 4 weeks
* Contraindication to MRI

Primary outcomes:
measure: Pharmacoresistance
timeFrame: 12 months
Secondary outcomes:
measure: Hippocampal NAA/creatine ratio
timeFrame: 12 months
Other outcomes:
Locations:
city: Halifax
country: Canada
facility: Halifax Infirmary
state: Nova Scotia
Study officials:
affiliation: Capital Health, Canada
name: Bernd Pohlmann-Eden, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Campos BA, Yasuda CL, Castellano G, Bilevicius E, Li LM, Cendes F. Proton MRS may predict AED response in patients with TLE. Epilepsia. 2010 May;51(5):783-8. doi: 10.1111/j.1528-1167.2009.02379.x. Epub 2009 Oct 20.