A cross‐sectional, prospective ocular motor study in 72 patients with Niemann‐Pick disease type C

Autor: Jordi Gascón Bayarri, Yasmina Amraoui, Michael Strupp, Larry A Abel, Miriam Kolníková, Eugen Mengel, Stanislavs Bardins, Ali Reza Tavasoli, Tatiana Bremova-Ertl, Anna Ardissone, Ettore Salsano, Andreas Brecht, Věra Malinová, Mark Walterfang, Mahmoud Reza Ashrafi, Stefan A Kolb
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: European Journal of Neurology
Dipòsit Digital de la UB
Universidad de Barcelona
ISSN: 1468-1331
1351-5101
Popis: Objective To characterize ocular motor function in patients with Niemann‐Pick disease type C (NPC). Methods In a multicontinental, cross‐sectional study we characterized ocular‐motor function in 72 patients from 12 countries by video‐oculography. Interlinking with disease severity, we also searched for ocular motor biomarkers. Our study protocol comprised reflexive and self‐paced saccades, smooth pursuit, and gaze‐holding in horizontal and vertical planes. Data were compared with those of 158 healthy controls (HC). Results Some 98.2% of patients generated vertical saccades below the 95% CI of the controls’ peak velocity. Only 46.9% of patients had smooth pursuit gain lower than that of 95% CI of HC. The involvement in both downward and upward directions was similar (51°/s (68.9, [32.7–69.3]) downward versus 78.8°/s (65.9, [60.8–96.8]) upward). Horizontal saccadic peak velocity and latency, vertical saccadic duration and amplitude, and horizontal position smooth pursuit correlated best to disease severity. Compensating strategies such as blinks to elicit saccades, and head and upper body movements to overcome the gaze palsy, were observed. Vertical reflexive saccades were more impaired and slower than self‐paced ones. Gaze‐holding was normal. Ocular‐motor performance depended on the age of onset and disease duration. Conclusions This is the largest cohort of NPC patients investigated for ocular‐motor function. Vertical supranuclear saccade palsy is the hallmark of NPC. Vertical upward and downward saccades are equally impaired. Horizontal saccadic peak velocity and latency, vertical saccadic duration and amplitude, and horizontal position smooth pursuit can be used as surrogate parameters for clinical trials. Compensating strategies can contribute to establishing a diagnosis.
In this largest cohort of patients with Niemann‐Pick type C disease examined so far, we found that vertical supranuclear saccade (VSSP), and not gaze palsy (VSGP), is the hallmark of this disease. We also identify the surrogate biomarkers that can be used in clinical trials to track the disease progress and treatment effect.
Databáze: OpenAIRE
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