Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Muscle Force Assessment in the Intensive Care Unit and in Primary Myopathies

This study is currently recruiting participants. (see Contacts and Locations)
Verified January 2017 by University Hospital, Basel, Switzerland
University of Minnesota - Clinical and Translational Science Institute
Information provided by (Responsible Party):
University Hospital, Basel, Switzerland Identifier:
First received: August 13, 2008
Last updated: January 12, 2017
Last verified: January 2017

The primary aim of the project is to apply the non-invasive stimulated muscle force assessment system to i) intensive care unit patients and ii) 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 monitor recovery periods, or disease progression, respectively. This new system will be evaluated until the year 2018. The investigators will determine variables of isometric skeletal muscle force.

These systems should serve as force monitoring tools and help to guide therapies.

Primary Myopathies

Study Type: Observational
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 2018

Resource links provided by NLM:

Further study details as provided by University Hospital, Basel, Switzerland:

Primary Outcome Measures:
  • Skeletal Muscle Force in ICU Patients and Patients with Primary Myopathies [ Time Frame: ICU patients: 1-3 months; Myopathy patients: up to 5 years ]
    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 many years

Secondary Outcome Measures:
  • 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 ]

Estimated Enrollment: 80
Study Start Date: September 2006
Estimated Study Completion Date: December 2018
Estimated Primary Completion Date: December 2018 (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

Detailed Description:

A force measuring system similar to one employed in previous studies will be redesigned with a new stimulator system and leg support system. This new, small, light and portable measurement system accurately measures patients' muscle forces. The system produces repeatable results. Over a long-time time period, this 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 or disease progression. 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.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Primary care clinic

Inclusion Criteria:

  • Any patient which fulfills the criteria for sepsis / septic shock according the definition of the American College of Chest Physicians/Society of Critical Care Medicine Consensus Conference
  • Patients who will be sedated, mechanically ventilated, and immobilized
  • Patients will be intubated the day of admission to ICU and started mechanically ventilated on a positive pressure ventilation modus
  • The severity of each patient¢s illness will be assessed using the Acute Physiology and Chronic Health Evaluation (APACHE) II score with required entry scores of a minimum of 15-20 Points
  • Patients suffering from a primary myopathy, e.g., Duchenne Muscular Dystrophy or subclinic myopathy, e.g. Malignant Hyperthermia.

Exclusion Criteria:

  • Patients with neuropathies, consuming diseases in an advanced state (metastatic cancer) and severe infectious diseases (e.g. AIDS, Hepatitis), as well as patients with injured legs and/or patients requiring neuromuscular blocking drugs.
  • Patients under the age of 18 yr.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00735384

Contact: Albert Urwyler, Professor MD +4161 265 2525
Contact: Hans F Ginz, MD +49 7621 41678600

University of Basel Hospital Recruiting
Basel, Switzerland, CH-4031
Contact: Albert Urwyler, Professor   
Contact: Hans F Ginz, MD    +49 7621 4168296   
Principal Investigator: Albert Urwyler, Professor MD         
Sponsors and Collaborators
University Hospital, Basel, Switzerland
University of Minnesota - Clinical and Translational Science Institute
Study Director: Albert Urwyler, Professor MD Departments of Anaesthesia and Research, University of Basel Hospital, CH-4031, Switzerland
  More Information

Responsible Party: University Hospital, Basel, Switzerland Identifier: NCT00735384     History of Changes
Other Study ID Numbers: 134/02
P21/08//A05/08 ( Other Identifier: Else-Kröner-Fresenius-Stiftung 2008; SGAR / SSAR Fonds 2007, Schweizerische Muskelstiftung (SMS) 2016 )
Study First Received: August 13, 2008
Last Updated: January 12, 2017

Keywords provided by University Hospital, Basel, Switzerland:
critical illness
muscle, skeletal
isometric contraction
intensive care units
muscular atrophy
malignant hyperthermia
skin resistance

Additional relevant MeSH terms:
Muscular Diseases
Systemic Inflammatory Response Syndrome
Pathologic Processes
Musculoskeletal Diseases
Neuromuscular Diseases
Nervous System Diseases processed this record on April 28, 2017