This study describes muscle involvement on whole-body MRI (WB-MRI) scans at different stages of McArdle disease. WB-MRI was performed on fifteen genetically confirmed McArdle disease patients between ages 25 to 80.
FULL LENGTH ARTICLE | ARTICLES IN PRESS August 05, 2021
This study describes muscle involvement on whole-body MRI (WB-MRI) scans at different stages of McArdle disease. WB-MRI was performed on fifteen genetically confirmed McArdle disease patients between ages 25 to 80. The degree of fatty substitution was scored for 60 muscles using Mercuri's classification. All patients reported an intolerance to exercise and episodes of rhabdomyolysis. A mild fixed muscle weakness was observed in 13/15 patients with neck flexor weakness in 7/15 cases, and proximal muscle weakness in 6/15 cases. A moderate scapular winging was observed in five patients. A careful review of the MRI scans, as well as hierarchical clustering of patients by Mercuri scores, pointed out recurrent muscle changes particularly in the subscapularis, anterior serratus, erector spinae and quadratus femoris muscles. WB-MRI imaging provides clinically relevant information and is a useful tool to orient toward the diagnosis of McArdle disease.
A higher aerobic fitness and an active lifestyle are associated with a higher workload eliciting the so-called SW phenomenon in patients with McArdle disease, which has a positive impact on their exercise tolerance during daily living.
In this study we extensively describe phenotypic and genotypic features of a large cohort of people with McArdle disease, all attending the Highly Specialized McArdle Disease and Related Disorders service at the National Hospital for Neurology and Neurosurgery, London.
Endogenous KBs are produced during fasting and ketogenic dieting; a diet that has shown early promising results but can be difficult to adhere to. This led us to explore the effects of an oral supplementation with exogenous KBs on exercise capacity and metabolism in patients with GSDV.
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