A device for rapid, painless, bedside muscle evaluation of children with neuromus

DESCRIPTION provided by applicant The neuromuscular assessment of children is uniquely challenging Unlike examination of the heart or lung the complete bedside assessment of the neuromuscular system requires the active participation of the child and results must be evaluated in the context of normal child development and degree of cooperation Moreover neuromuscular disease severity is highly variable and progression if present is typically very slow This impacts not only diagnosis but also assessment of therapy Indeed clinical therapeutic trials and regular patient care may require children to undergo invasive or inconvenient tests including muscle biopsy magnetic resonance imaging and electromyography A sensitive noninvasive test to detect and measure neuromuscular pathology in children would greatly improve the ability to evaluate new therapies as well as to assist in the regular care of children suffering from these conditions Electrical impedance myography EIM is one technique that may be especially useful in this regard In EIM an imperceptible high frequency electrical current is applied via surface electrodes to a muscle or muscle group of interest and alterations in the consequent surface voltage pattern are measured Alterations in the surface voltage patterns provide information on disease status and can track change over time Convergence Medical Devices Inc is a small business whose main interest is in the commercialization of devices for the rapid application of EIM In this applicatin Convergence plans to build upon its success in its Phase SBIR by further refining EIM technology for application to a pediatric population We will achieve this by teaming up with several well respected pediatric neuromuscular researchers across the country to further refine and test our system through four specific aims In Specific Aim we will obtain normative data on multiple muscles in boys and girls aged years and develop a user friendly scoring system based on the percent predicted normal akin that performed for pulmonary function testing In Specific Aim with the input of several experts we will improve our software to incorporate these scores aiming to create a straightforward user interface In Specific Aims and we will test our improved system in one of the most common and devastating neuromuscular diseases of childhood Duchenne muscular dystrophy DMD We will first validate several optimized EIM scores that effectively track disease status in year old children over year in whom functional measures can generally be accurately obtained We will then evaluate the success of these EIM scores in their ability to detect disease progression over and month periods of time in DMD boys as compared to groups of healthy boys years years and years of age In addition to further refining pediatric EIM we will also create innovative shared resources including an online calculator to assist with EIM sample size calculations and an open source online database of normal and DMD data which can serve as a foundation for future shared pediatric neuromuscular disease resources to both academic and industry investigators alike PUBLIC HEALTH RELEVANCE The evaluation of neuromuscular diseases in childhood remains hampered by ineffective tools for muscle assessment since very young children may be unable to cooperate with an examination and older children with some diseases may be too weak to perform strength testing at all In this study we propose to further develop the technique of electrical impedance myography by developing a range of reference values obtained on a large group of healthy children making refinements to the software and then testing the capabilities of the enhanced system on children with a common progressive neuromuscular disease Duchenne muscular dystrophy With the completion of this work we plan to have developed a new convenient tool for the office based assessment of children with a wide variety of neuromuscular conditions