Muscle Force Assessment in the Intensive Care Unit and in Primary Myopathies
The primary aim of the project is to apply the redesigned non-invasive stimulated muscle force assessment system to intensive care unit patients and patients with primary myopathy or subclinic myopathy (e.g., Duchenne muscular dystrophy, Myotonia, MH). The investigators will use this new methodology of force assessment to phenotype patients weakness during their illnesses (depict typical force pattern) and recovery periods. This new system will be evaluated until the year 2016. The investigators will measure parameters of isometric skeletal muscle force. An anonymized data bank is built up at the University of Minnesota in Minneapolis.
These systems should serve as force monitoring tools and help to guide therapies.
|Study Design:||Observational Model: Case Control
Time Perspective: Prospective
|Official Title:||Application of Methodology of Non-invasive Stimulated Muscle Force Assessment to ICU Patients and Patients With Primary Myopathies to Characterize Their Muscle Weakness - Extension of the Study Protocol: 2008 to 2016|
- Skeletal Muscle Force in ICU Patients and Patients with Primary Myopathies [ Time Frame: ICU patients: 1-3 months; Myopathy patients: up to 4 years ] [ Designated as safety issue: No ]Characterisation and follow up of the muscle force of the lower leg in severly ill patients of a intensive-care-unit. To characterise primary myopathy patients typical force pattern of the lower leg and to follow up their individual disease progression over a couple of years
- Muscle forces pending on the Malignant Hyperthermia (MH) status of a patient (susceptible to MH or not susceptible to MH) [ Time Frame: at the time point of MH testing, i.e., at hospital admission ] [ Designated as safety issue: No ]
|Study Start Date:||September 2006|
|Estimated Study Completion Date:||December 2016|
|Estimated Primary Completion Date:||December 2016 (Final data collection date for primary outcome measure)|
Patients with critical illness myopathy
Patients with,e.g., sepsis, with secondary myopathy
Patients with Primary Myopathies
Patients with primary myopathy, e.g., Duchenne Muscular Dystrophy, Myotonia
A force measuring system similar to one employed in previous studies will be redesigned with a new stimulator system and leg support system (aluminium). An electromyogram will be combined. This new, small, light and portable measurement system accurately measures patients' muscle forces. The system produces repeatable results. Over a time period of 9 years, this new system will be applied to ICU patients and patients with primary myopathies, e.g. muscular dystrophy Duchenne or myotonias, and their ankle dorsiflexor isometric torques measured after electrical peroneal nerve stimulation. Torques will be amplified and converted into electrical signals by a Whetstone bridge, and data will be stored on a computer (LabView system). Stimulated torque responses will be obtained regularly, and subsequently the individualized curves will be determined. Electromyogram will be performed at each recording session. For all subjects possible, the investigators will continue to monitor their stimulated muscle forces during their recovery periods. Type of data: Variables of isometric skeletal muscle contractions, such as peak torques, contraction and relaxation times and torque latencies. To find an assumed difference of 50% in strength, at least 30 individuals (power 0.9) are required.
Values will be compared to patients voluntary forces, determined by Muscle Research Council (MRC) and Manual Muscle Test (MMT) scores.
Additionally, skin resistances of edema patients will by determined employing a twitch stimulator and an oscilloscope. We are interested whether edema (fluid) changes tissue resistance. Data are required to redesign the new stimulation unit of the muscle force measuring system.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00735384
|Contact: Albert Urwyler, Professor MD||+4161 265 2525||Albert.Urwyler@usb.ch|
|Contact: Hans F Ginz, MD||+49 7621 firstname.lastname@example.org|
|University of Basel Hospital||Recruiting|
|Basel, Switzerland, CH-4031|
|Contact: Albert Urwyler, Professor Albert.Urwyler@usb.ch|
|Contact: Hans F Ginz, MD +49 7621 4168296 email@example.com|
|Principal Investigator: Albert Urwyler, Professor MD|
|Study Director:||Albert Urwyler, Professor MD||Departments of Anaesthesia and Research, University of Basel Hospital, CH-4031, Switzerland|