Study and Treatment of Visual Dysfunction and Motor Fatigue in Multiple Sclerosis
Keywords
Abstract
Description
This project focuses on fatigue, an extremely common yet poorly understood complaint in patients affected by multiple sclerosis (MS). Primary fatigue, that is fatigue not secondary to other MS-associated symptoms (e.g., sleep disorder or depression), is a distinct clinical entity and a cause of severe disability in most patients. As fatigue limits everyday activities and interferes with exercise-based rehabilitation, understanding its mechanisms is crucial to improving function and quality of life of Veterans with MS. Primary fatigue is divided in two broad categories, mental (cognitive) and physical (motor) fatigue, the latter being the focus of this proposal. Evidence suggests that primary motor fatigue originates within the central nervous system (CNS) but, although several factors have been invoked (e.g., demyelination, axonal loss, inflammation), a neurophysiological model to explain its underlying mechanisms is still lacking.
First, with this project, the investigators propose a characteristic eye movement abnormality, internuclear ophthalmoparesis (INO), as a simple and accessible model for primary motor fatigue in MS. INO is a disorder of binocular coordination (conjugacy), in which fast eye movements (saccades) of the adducting eye (i.e., the eye moving towards the nose) are slow during horizontal gaze shifts, due to demyelination of a specific CNS pathway (the medial longitudinal fasciculus, MLF). Preliminary results in a small MS group of patients show that patients with INO exhibit changes in ocular conjugacy (i.e., ocular motor fatigue) during a 10-minute saccadic fatigue test, but normal subjects do not. The investigators hypothesize that ocular motor fatigue is representative of a major component of primary motor fatigue in MS, as it likely reflects deterioration of neural conduction fidelity along the demyelinated MLF axons. The investigators aim at showing that ocular motor fatigue occurs in a larger MS population with INO by measuring changes of binocular conjugacy on eye movement recordings using two main measures: 1) abducting/adducting eye ratio for saccadic peak velocity (pulse size ratio); 2) time difference in occurrence of peak acceleration in the adducting vs. the abducting eye (pulse time delay), during the 10-minute fatigue test. The investigators will determine whether ocular motor fatigue is associated with symptomatic subjective fatigue as assessed with standard fatigue questionnaires. Second, The investigators intend to test efficacy of dalfampridine, a potassium channel blocker that enhances neural conduction along demyelinated axons, in MS patients with INO with or without associated ocular motor fatigue. Visual dysfunction in MS patients with INO is a major cause of disability as they are severely limited in daily activities such as driving and can suffer further disability when developing ocular motor fatigue during a sustained visual task (e.g., reading). However, no medical therapy is available for INO/ocular motor fatigue. Preliminary results document improved binocular conjugacy in three MS patients taking dalfampridine for gait impairment (the FDA-approved indication for this medication). These data also showed improvement of ocular motor fatigue after dalfampridine in one patient. The investigators hypothesize that dalfampridine improves visual performance in MS patients with INO and counteracts ocular motor fatigue and, in turn, diminishes visual disability and improves quality of life. Thus, the investigators will conduct a randomized, placebo-controlled, double-blind, crossover trial of dalfampridine (10mg twice a day) of 10 weeks duration. Before and after treatment, the investigators will assess for changes in binocular conjugacy by eye movement measures as above, as well as changes in clinical measures, such as reading acuity and speed, saccades performance, gait performance, symptomatic fatigue, visual disability and quality of life. the investigators will determine whether improvement of visual performance has positive effects on overall disability and quality of life of MS patients with INO. The investigators will also determine whether there is an association between response of eye movement and gait performances to dalfampridine.
Dates
| Last Verified: | 01/31/2020 |
| First Submitted: | 03/02/2015 |
| Estimated Enrollment Submitted: | 03/11/2015 |
| First Posted: | 03/17/2015 |
| Last Update Submitted: | 02/25/2020 |
| Last Update Posted: | 03/01/2020 |
| Actual Study Start Date: | 03/31/2015 |
| Estimated Primary Completion Date: | 01/30/2019 |
| Estimated Study Completion Date: | 03/30/2019 |
Condition or disease
Intervention/treatment
Drug: dalfampridine
Drug: placebo
Phase
Arm Groups
| Arm | Intervention/treatment |
|---|---|
| Experimental: dalfampridine 10-week randomized, placebo controlled, double-blind, crossover trial, which includes a period of wash out of two weeks between treatment with dalfampridine and placebo. Within the trial, each patient serves as his own control. | Drug: dalfampridine 10-week randomized, placebo controlled, double-blind, crossover trial, which includes a period of wash out of two weeks between treatment with dalfampridine and placebo. |
| Placebo Comparator: placebo 10-week randomized, placebo controlled, double-blind, crossover trial, which includes a period of wash out of two weeks between treatment with dalfampridine and placebo. Within the trial, each patient serves as his own control. | Drug: placebo 10-week randomized, placebo controlled, double-blind, crossover trial, which includes a period of wash out of two weeks between treatment with dalfampridine and placebo. |
Eligibility Criteria
| Ages Eligible for Study | 18 Years To 18 Years |
| Sexes Eligible for Study | All |
| Accepts Healthy Volunteers | Yes |
| Criteria | Inclusion Criteria: - Diagnosis of MS of any course and duration - Evidence of mild to moderate internuclear ophthalmoparesis (INO), that is slowing of the adducting eye on physical examination of saccadic speed, whether INO is unilateral or bilateral, symmetrical or asymmetrical - Medically stable conditions, ability to give informed consent and understand and cooperate with the testing - Dalfampridine-naive as well as history of taking dalfampridine in the past, whether there was benefit in gait impairment or not, after a washout period of at least 2 weeks Exclusion Criteria: - Lack of evidence of INO (slowing of the adducting eye) on physical examination of saccadic speed - Severe INO (i.e., exotropia in primary gaze) on physical examination - Medically unstable conditions, inability to give informed consent and understand and cooperate with the testing - History of side effects from dalfampridine - History of seizures - Moderate or severe renal failure, assessed by clearance of creatinine |
Outcome
Primary Outcome Measures
1. Eye movement assessment [baseline, after 4 weeks, after 6 weeks, after 10 weeks]
Secondary Outcome Measures
1. Visual function assessment [baseline, after 4 weeks, after 6 weeks, after 10 weeks]
2. Gait assessment [baseline, after 4 weeks, after 6 weeks, after 10 weeks]
3. Visual disability assessment [baseline, after 4 weeks, after 6 weeks, after 10 weeks]
4. Quality of life assessment [baseline, after 4 weeks, after 6 weeks, after 10 weeks]
