Seizure risk with AVM treatment or conservative management: prospective, population-based study

Area of Science:

• Neurology
• Neurosurgery
• Epidemiology

Background:

• Brain arteriovenous malformations (AVMs) are complex vascular lesions that can lead to serious neurological complications, including seizures and hemorrhage.
• The optimal management strategy for brain AVMs remains a subject of ongoing research, balancing the risks of treatment against the natural history of the condition.
• Epileptic seizures are a common presentation and complication of brain AVMs, significantly impacting patient quality of life.

Purpose of the Study:

• To compare the risk of epileptic seizures in adults undergoing invasive treatment for brain AVMs versus those managed conservatively.
• To evaluate the likelihood of achieving seizure freedom for two years in adults with brain AVMs under different management strategies.
• To analyze seizure risk based on the initial presentation of the brain AVM (hemorrhage, seizure, or incidental finding).

Main Methods:

• A prospective, population-based observational study was conducted in Scotland.
• Data were collected from 1999-2003 for adults newly diagnosed with brain AVMs.
• Annual general practitioner follow-up, patient questionnaires, and medical records surveillance were used to assess seizure risk and freedom over five years.

Main Results:

• No significant difference in the 5-year risk of first or recurrent seizures was observed between AVM treatment and conservative management groups.
• Seizure risk was comparable across both management strategies, irrespective of AVM presentation (intracerebral hemorrhage, seizure, or incidental).
• The chances of achieving 2-year seizure freedom were similar for patients with epilepsy in both the AVM treatment (52%) and conservative management (57%) groups.

Conclusions:

• In this observational study, invasive treatment for brain AVMs did not alter the 5-year risk of seizures compared to conservative management.
• The choice between AVM treatment and conservative management did not significantly impact seizure outcomes, regardless of the initial presentation.
• These findings suggest that conservative management may be a viable option for select patients with brain AVMs, particularly concerning seizure risk.