กลุ่มกล้ามเนื้อและจำนวนการตรวจคลื่นไฟฟ้ากล้ามเนื้อในการ ระบุโรครากประสาทส่วนเอวร่วมใต้กระเบนเหน็บ
Number of Muscle Groups Study for Identifying Lumbosacral Radiculopathy
Keywords:
number of muscles, electromyography, lumbosacral radiculopathy, paraspinal muscleAbstract
ABSTRACT
Objectives: To determine the optimal electromyographic screening examination that ensures identification of the lumbosacral radiculopathy (LSR).
Study design: Retrospective descriptive study.
Setting: Electrodiagnostic laboratory at Rehabilitation Medicine Department of Phramongkutklao Hospital.
Subjects: The patients with electrodiagnostically comfirmed LSR from January 2008 – December 2012.
Methods: There were 186 patients with 224 electrodiagnostically confirmed LSR was conducted to determine which muscles and how many muscles were required to identify a lumbosacral radiculopathy. All lumbosacral radiculopathies showed abnormal spontaneous activity in at least two muscles innervated by the same nerve root level but different peripheral nerves. All cases categorized by radiculopathy level and most frequently abnormal individual muscles were combined into different type of muscle groups. Each type of muscle groups included paraspinal muscle. The percentage of identifying a radiculopathy in each muscle group was the number of revealing abnormal electromyographic findings in one or more muscles in the group divided by the total number of radiculopathies.
Results: Among all electrodiagnostic data of LSR, the L5-S1 radiculopathy was the most common diagnosis (33.5%).The paraspinal muscle alone identified 89.5% of lumbosacral radiculopathies. When paraspinal muscle was one of the examined muscles, four muscles identified 78.57-97.32 %, five muscles identified 80.80-98.66 %, six muscles identified 84.82-99.55%, seven muscles identified 91.96-99.55% and eight to nine muscles identified 97.32-99.55% of lumbosacral radiculopathies
Conclusion: Paraspinal muscle should be included in electromyographic study to determine lumbosacral radiculopathy. Six muscles including paraspinal muscle yield high identification rates of abnormal spontaneous activities. There is no improvement in identification if the number of muscle studied is increased.
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