2015 Electrodiagnostic Self-Assessment-2015 EDX SAE Answers

2015 EDX SAE Answers

Pdf Summary

Factors such as age, temperature, anesthetic agents, and orthodromic motor conduction velocity affect the persistence of nerve responses. The F-wave persistence is within normal range, indicating no abnormality. The peroneal nerve has the lowest persistence at 5%, while the tibial, ulnar, median, and radial nerves have around 40% persistence. Disorders affecting the acetylcholine receptor, like myasthenia gravis, can cause changes in the post-synaptic area and acetylcholine receptors. NCV reaches adult range by age 3-5, and CMAP amplitude decreases with age. Temperature affects electrodiagnostic testing. Reinnervation and neuromuscular junction disorders show abnormalities on repetitive nerve stimulation. Lambert-Eaton myasthenic syndrome involves antibodies attacking presynaptic voltage-gated calcium channels. Reversing the anode and cathode in nerve conduction studies can cause prolongation of latency and anodal block. Froment's sign indicates ulnar nerve palsy, while handlebar palsy is caused by ulnar nerve compression during cycling. The suprascapular nerve innervates the supraspinatus and infraspinatus muscles. Femoral nerve compression can result in focal femoral neuropathy or lumbar plexopathy. Scapular winging is often caused by nerve lesions. Myotonic discharges are enhanced with decreasing temperature.

Keywords

age

temperature

nerve responses

F-wave persistence

peroneal nerve

ulnar nerve

acetylcholine receptor

myasthenia gravis

nerve conduction studies

suprascapular nerve

ncs