Clinical trial NCT00588432: Characterization of Skeletal Muscle Using Magnetic Resonance Elastography (MRE)
Official title: Characterization of Skeletal Muscle Using Magnetic Resonance Elastography (MRE)
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Stroke
Immobilization
Myofacial Pain
Hyperthyroid Myopathy
Keywords: Stroke
Immobilization
Myofacial Pain
Hyperthyroid Myopathy
Lead sponsor: Mayo Clinic
Sponsor class: OTHER
First posted: 2008-01-08
Enrollment: 300
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: CROSS_SECTIONAL
Sampling method: PROBABILITY_SAMPLE
Study population: Residents of the community and patients of the study investigators.

Brief summary: The goal of this proposal is two-fold: (1) to further develop and validate a technology, magnetic resonance elastography (MRE), for quantitatively imaging mechanical properties and tension distribution in muscle and (2) to apply the technique for in vivo evaluation of patients with four common, and clinically significant muscle disorders (spasticity, disuse atrophy, myofascial pain and a metabolic myopathy). These studies will employ a magnetic resonance imaging sequence with synchronous motion-sensitizing gradients to map propagating shear waves in the muscle. The technique will assess the mechanical properties of the muscle and its tension distribution. Specifically, the study can be divided into three specific aims. Aim 1: Optimize MRE methods of acquisition and analysis for the assessment of muscle, including electromechanical drivers, data acquisition techniques, and methods for image analysis. Advanced techniques for very rapid MRE assessment of muscle will continue to be developed. Aim 2: Validate the MRE assessment of muscle properties and tension with phantom, ex-vivo muscle, and Finite Element Modeling (FEM) techniques. Finite Element Analysis will be performed by using both phantom and bovine muscles to better correlate MRE wave-length findings as function of muscle properties, tension and fiber architecture. Aim 3: Study In Vivo Normal and Abnormal Muscle. The MRE technique will be applied in vivo to provide elastographic images of abnormal muscle with known disorders. The patient groups chosen for study are each important in their own right, and furnish unique information across the spectrum of muscular disease and dysfunction. Groups to be studied include individuals with new onset of spasticity following an ischemic, hemispheric stroke, disuse atrophy as a result of immobilization, metabolic (hyperthyroid) myopathy and myofascial pain for trigger point identification. The overall hypothesis of this work is that will bring benefits to both basic research and clinical care.


Eligibility criteria: Inclusion Criteria:

Normals:

* Healthy individuals

Stroke:

* a first stroke (i.e., a unilateral, ischemic hemispheric stroke) within the previous one to two months, ability to cooperate and follow simple commands, and gastrocsoleous strength in the affected lower extremity of between trace and 50% of normal.

Immobilization:

* immobilized in a cast (typically 6 weeks) following sugical repair of a severe Achilles tendon tear or rupture, ankle injury or plantar fascial pain

Myofascial Pain:

* history of pain in trapezius confirmed by clincal examination. The examiner will perform snapping palpation over the MFTP. If a localized, transient contraction is observed, the response is considered to be positive and the subject will be considered eligible for entry into the study.

Hyperthyroid Myopathy:

* clinical assessment in combination with a serum hormone profile of increased Free Thyroxine (FT4) and Triiodothyronine (T3) in the face of suppressed levels of Thyroid Stimulating Hormone (TSH).

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Rochester
country: United States
facility: Mayo Clinic
state: Minnesota
Study officials:
References: