Quantitation of McArdle's Sign and Evaluation of Specificity for Multiple Sclerosis

Multiple Sclerosis Clinical Trial

Official title: Quantitation of McArdle's Sign and Evaluation of Specificity for Multiple Sclerosis

Status Completed

Clinical Trial Summary

The study is designed to quantitate McArdle's sign, an increase in measurable weakness with neck flexion described in patients with multiple sclerosis, and to determine whether it is or is not specific for multiple sclerosis.

Clinical Trial Description

Finger strength will be measure using a torque-measuring device designed to quantitate finger extension strength. The device was designed for point of treatment use, patient safety and portability. Strength will be measured in 5 paired trials, first with neck extended and then with neck flexed. Two protocols will be evaluated, one testing isometric strength against a fixed resistance and the second testing strength against dynamic resistance. McArdle's sign is the difference between strength with neck extension and strength with neck flexion.

The data will be digitally registered and dynamic neck position will be recorded electronically in real time. Graphs of dynamic changes in torque versus neck position will be generated and superimposed. Strength will be quantitated using Matlab software.

Consecutive patients with myelopathy of any cause with detectable finger extensor weakness will be studied, either due to MS or due to other cause of myelopathy (other inflammatory, vascular, compressive, neoplastic and other). Additionally, normal controls will be studied as will patients with finger extension weakness due to peripheral nerve lesions. ;

Related Conditions & MeSH terms

• Multiple Sclerosis
• Sclerosis

• NCT number: NCT03122873
• Study type: Observational
• Source: Mayo Clinic
• Status: Completed
• Phase: N/A
• Start date: February 1, 2016
• Completion date: June 30, 2017