Transcription of Abnormal EMG Patterns in Disease - …
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Abnormal EMG Patterns in Disease - …
Abnormal EMG Patterns in Disease Amanda C. Peltier, MD MS October 12, 2013 Disclosures nI have no financial relationships to disclose that are relative to the content of my presentation. Basic Tenets of EMG nEMG (even more than nerve conduction studies) is an extension of the physical exam nWhen in doubt, reexamine the patient (or check the equipment) nWhen in doubt, do not overcall nEDX findings should be reported in the context of the symptoms and referral doctor s question nEDX are uncomfortable. Always stop when the patient asks. Abnormal Spontaneous Activity nFibrillation potentials: spontaneous depolarizations nPositive sharp waves: same significance as fibrillation potentials nComplex repetitive discharges: depolarization of a single fiber followed by ephaptic spread (muscle membrane to muscle membrane) nMyotonic Discharge: spontaneous discharge of msucle fiber with waaxing and waning of amplitude and frequency (rate between 20 and 150) nFasciculation: Single, spontaneous, involuntary discharge (slow)
n EMG (even more than nerve conduction studies) is an extension of the physical exam n When in doubt, reexamine the patient (or check the equipment)
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