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Hemispherectomy Outcome Prediction Scale: a validity study.

Andrew T Hale¹, Dagoberto Estevez-Ordonez¹, Jana Badrani²

¹1Department of Neurosurgery, University of Alabama at Birmingham.

Journal of Neurosurgery. Pediatrics

|July 28, 2023

Summary

This summary is machine-generated.

The Hemispherectomy Outcome Prediction Scale (HOPS) did not prove reliable in predicting seizure freedom after hemispherectomy in this validation study. Further research is needed to refine epilepsy surgery outcome prediction tools.

Keywords:

Engel class Hemispherectomy Outcomes Prediction Scale pediatric epilepsy surgery reliability seizure validity

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Area of Science:

Neurosurgery
Epileptology
Medical Statistics

Background:

Hemispherectomy is a highly effective treatment for medically refractory epilepsy (MRE) originating from a single hemisphere.
The Hemispherectomy Outcome Prediction Scale (HOPS) was recently developed to predict seizure freedom post-hemispherectomy.

Purpose of the Study:

To validate the generalizability of the HOPS score in a new cohort of patients undergoing hemispherectomy.
To assess the predictive accuracy of the HOPS score using statistical validation methods.

Main Methods:

Observational, retrospective study of 60 patients undergoing lateral peri-insular hemispherectomy over 20 years.
Validation of the HOPS score using variables such as seizure onset age, semiology, PET hypometabolism, seizure substrate, and prior resections.
Statistical analyses included multivariable logistic regression, multiple imputation, and Bayesian analysis.

Main Results:

80% of patients achieved Engel class I outcome (seizure freedom) at 1 year post-surgery.
Neither the original HOPS score model nor a revised model including contralateral MRI findings were statistically significant predictors of seizure freedom (p = 0.2588 and p = 0.4715, respectively).
Bayesian analysis also failed to validate the HOPS score's predictive capability.

Conclusions:

The HOPS score requires further rigorous validation and reliability testing before clinical use.
Prospective, standardized, and longitudinal studies are necessary to improve prediction of hemispherectomy outcomes.