On electromyography, all of the following features suggest denervation, EXCEPT:
Correct Answer: Less inseional activity is observed in denervated muscles
Description: Inseional activity refers to the burst of action potentials that is usually observed when the EMG needle is inseed into the muscle. Increased inseional activity is observed in denervated muscles. Relaxed muscle normally is electrically silent except in the end plate region, but abnormal spontaneous activity occurs in denervation or inflammatory changes in affected muscle. Giant polyphasic potentials arise from motor units containing more than the usual number of muscle fibers that are spread out over a greatly enlarged territory within the muscle. Fibrillation potentials and positive sharp waves (which reflect muscle fiber irritability) and complex repetitive discharges are most often. Ref: Waxman S.G. (2010). Chapter 23. Electrodiagnostic Tests. In S.G. Waxman (Ed), Clinical Neuroanatomy, 26e.
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now