| Summary: | BACKGROUND/AIMS: Large clinical trials including patients with uncommon diseases involve assessors in different geographical locations, resulting in considerable inter-rater variability in assessment scores. As video recordings of examinations, which can be individually rated, may eliminate such variability, we measured the agreement between a single video rater and multiple examining physicians in the context of PRION-1, a clinical trial of the antimalarial drug quinacrine in human prion diseases. METHODS: We analysed a 43-component neurocognitive assessment battery, on 101 patients with Creutzfeldt-Jakob disease, focusing on the correlation and agreement between examining physicians and a single video rater. RESULTS: In total, 335 videos of examinations of 101 patients who were video-recorded over the 4-year trial period were assessed. For neurocognitive examination, inter-observer concordance was generally excellent. Highly visual neurological examination domains (e.g. finger-nose-finger assessment of ataxia) had good inter-rater correlation, whereas those dependent on non-visual clues (e.g. power or reflexes) correlated poorly. Some non-visual neurological domains were surprisingly concordant, such as limb muscle tone. CONCLUSION: Cognitive assessments and selected neurological domains can be practically and accurately recorded in a clinical trial using video rating. Video recording of examinations is a valuable addition to any trial provided appropriate selection of assessment instruments is used and rigorous training of assessors is undertaken.
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