Diagnostic EMG/NCS

Diagnostic EMG/NCS True or false? Diagnostic EMG/NCS can establish a diagnosis - ANS False Nerve conduction velocity testing measures: - ANS compound action potential Typical nerves tested in UE - ANS median, radial, ulnar Typical nerves tested in LE - ANS Peroneal, posterior tibial, sural For nerve conduction velocity testing, the cathode should be placed ____ to the anode - ANS Distal The recording electrode is placed on the _______ when testing the median nerve - ANS abductor pollicis brevis The recording electrode is placed on the _______ when testing the radial nerve - ANS extensor indicis The recording electrode is placed on the _______ when testing the ulnar nerve - ANS abductor digiti minimi The recording electrode is placed on the _______ when testing the deep peroneal nerve - ANS extensor digitorum brevis The recording electrode is placed on the _______ when testing the posterior tibial nerve - ANS abductor hallucis brevis Orthodromic conduction: action potential travels in _____ direction as physiological - ANS same Antidromic conduction: action potential travels in _____ direction as physiological - ANS opposite In a sensory nerve conduction velocity study of the median nerve, the action potential travels ______ - ANS antitdromically Women have _____ compound sensory action potentials than men - ANS larger Neuropraxia - ANS localized conduction slowing with or without conduction block True or false? Neuropraxia is associated with axon discontinuity and therefore produces axonal degeneration - ANS False A conduction block results in reduced amplitudes on the _____ side of the block - ANS proximal Axonotmesis - ANS Disruption of axon continuity without damage to connective tissue True or false? Conduction velocity may not change in a partially denervated nerve - ANS True Neurotmesis - ANS complete axonal disruption and damage to connective tissue F-wave testing tests ____ neurons - ANS motor H-Reflex testing assesses the _____ reflex and measures the H-wave _____ - ANS stretch reflex; latency Fibrillation of muscle at rest is caused by damage to the: - ANS muscle membrane Positive sharp waves at rest are associated with: - ANS myopathy or neuropathy Polyphasic ( ___ phases) waveforms during volitional contraction suggests pathology - ANS 5 Polyphasic motor unit potentials suggest: - ANS Deteriorating or regenerative motor units mononeuropathy - ANS abnormal findings in muscles distal to lesion only