AED Quiz | Episode 17 | Audio Epilepsy Digest

1. What is the most defensible role for the 50 percent responder threshold in neuromodulation studies? It should be abandoned because any binary threshold is clinically meaningless. It is a useful standardized anchor, but it should be interpreted with the underlying reduction distribution, seizure freedom, denominator, time horizon, patient-important outcomes, and harms. It is sufficient whenever the study is multicenter. It is a validated universal surrogate for quality of life and treatment burden.

Correct answer: B. The episode retains the familiar threshold for communication and comparison while denying it solitary primacy or universal surrogate status.

2. A study reports a higher responder proportion at later visits. What must be checked before describing cumulative benefit? Only whether the p value is below 0.05. Whether the device received regulatory clearance. Who remained under observation, how missingness was handled, whether medications or programming changed, and whether a control group supports a causal interpretation. Whether the later percentage exceeds 50 percent.

Correct answer: C. Changing denominators, attrition, time-varying cointerventions, programming, and absent controls can make later observed proportions look different without proving a cumulative device effect.

3. How should the ESTEL result be summarized? The trial was definitively positive because 89 percent had an electrographic response. The diary-based primary responder comparison was not significant, while a secondary ambulatory-EEG responder analysis favored stimulation; the small sample and wide uncertainty prevent outcome switching or an unqualified positive verdict. The negative diary result proves diaries are unusable in Lennox-Gastaut syndrome. Electrographic seizure reduction is automatically more patient-important than clinical change.

Correct answer: B. The episode preserves both the negative prespecified primary result and the positive objective secondary signal without treating objective detection and patient importance as synonyms.

4. Which finding would be sufficient to use a biomarker for current neuromodulation candidate selection? A high AUC in an eight-patient held-out subset from the same single-center cohort. A post-treatment blood-marker association with response. External validation with calibration and evidence that using the marker improves a real clinical decision. A plausible mechanistic explanation accompanying a retrospective association.

Correct answer: C. Prediction development, external validation, calibration, and decision utility are separate steps. The episode treats the cited EEG and inflammatory findings as hypothesis-generating.

What Counts as Neuromodulation Success?

Learning Objectives

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Reflection

Review Basis