Determinants of Functional Outcome after Pediatric Hemispherotomy

Area of Science:

• Pediatric Neurology
• Neurosurgery
• Epileptology

Background:

• Hemispherotomy is a surgical procedure for intractable epilepsy, involving disconnection of one cerebral hemisphere.
• Functional outcomes, including motor and speech abilities, are crucial for assessing the success of hemispherotomy in children.
• Identifying determinants of functional outcome is essential for patient selection and post-operative management.

Purpose of the Study:

• To evaluate the determinants of functional outcomes, specifically unaided walking, voluntary grasping, and speaking, after pediatric hemispherotomy.
• To analyze a large, recent multicenter cohort to identify factors influencing functional recovery.
• To utilize advanced statistical modeling for robust identification of outcome predictors.

Main Methods:

• Retrospective analysis of 455 children undergoing hemispherotomy across 5 epilepsy centers (2000-2016).
• Assessment of functional outcomes: unaided walking, voluntary grasping, and speaking.
• Bayesian multivariable regression modeling with missing data imputation to identify determinants.

Main Results:

• High seizure freedom rate (75%) and medication cessation (44%) at a mean follow-up of 5.1 years.
• Seventy-seven percent achieved unaided walking, 8% voluntary grasping, and 68% speech.
• Predictors of poor walking included contralateral MRI abnormalities, recurrent seizures, and lower postsurgical intellectual functioning. Rasmussen encephalitis and Sturge-Weber syndrome were associated with poor grasping. Contralateral MRI abnormalities and longer epilepsy duration predicted impaired speech.

Conclusions:

• Etiology and bilaterality of brain abnormalities are key determinants of functional outcome post-hemispherotomy.
• Longer epilepsy duration negatively impacts language outcomes.
• Older age at outcome evaluation correlates with improved walking and speaking abilities.