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46 Possible Causes for Compound Muscle Action Potential with Low Amplitude

  • Neuropathy

    Patients have relatively normal nerve conduction velocities but low amplitude sensory nerve action potentials and compound muscle action potentials.[]

  • Food-Borne Botulism

    Electrophysiologic tests of such patients show reduced compound muscle action potentials (CMAPs), low amplitudes and short durations of motor unit potentials (MUPs), and mild[]

  • Bickerstaff Brainstem Encephalitis

    (absent R2) suggested central dysfunction, whereas results of facial nerve conduction studies (low amplitudes of compound muscle action potentials), F-wave and H-reflex studies[] The electroencephalographic findings (diffuse slow activity), median somatosensory evoked potential (absent cortical N20 with normal cervical N13), and blink reflex studies[]

  • Tick Paralysis

    Neurophysiological studies reveal low-amplitude compound muscle action potentials with normal motor conduction velocities, normal sensory studies and normal response to repetitive[]

  • Distal Hereditary Motor Neuropathy Type 1

    Compound muscle action potentials are either absent or low amplitude with motor conduction velocities ranging from 3 to 10 meters per second.[] Diagnostically, these infants have absent SNAPs or low amplitude SNAPs with prolonged distal latencies.[]

  • Infantile Hemiplegia

    , AH - abductor hallucis muscle, Ampl- amplitude, L- left, R- right Figure 1 - Reduced motor nerves compound muscle action potential and slow conduction velocity with low[] […] distal amplitude of A) left median, and B) tibial nerves.[] Distance Velocity ms mV cm m/s L Median - APB Wrist 2.20 1.3 3 Elbow 4.50 1.1 7 30.4 R Tibial (Knee) - AH Ankle 2.55 4.7 3 Knee 5.20 3.0 11 41.5 APB - abductor pollicis brevis muscle[]

  • Ulnar Neuropathy

    amplitudes of sensory nerve action potentials and compound muscle action potentials Differential How to differentiate ulnar tunnel syndrome from cubital tunnel syndrome cubital[] […] diagnose ulnar artery thrombosis neurovascular exam Imaging Studies NCS and EMG helpful in establishing diagnosis and prognosis threshold for diagnosis conduction velocity low[]

  • Miller-Fisher Syndrome

    CBs resolved, distal compound muscle action potential (CMAP) amplitudes increased and SNAPs normalized on subsequent testing.[] In the other patient, initial studies showed low/normal CMAPs, with absent SNAPs, without demyelinating features. This patient fully recovered within 21 days from onset.[]

  • Guillain-Barré Syndrome

    muscle action potentials reduced amplitude with relatively preserved conduction velocity implicates axonal neuropathy delayed/absent F waves implicates nerve root involvement[] […] lymphocytic predominance) occurs in the late first week other CSF serologies typically normal Nerve conduction studies slowed conduction velocity reduced amplitude in compound[] Spirometry to ensure adequate respiratory function intubate early if necessary Lumbar puncture albumin cytologic disassociation elevated protein mostly acellular (or with low[]

  • Cardiodysrhythmic Potassium-Sensitive Periodic Paralysis

    muscle action potential on electromyography and no notable changes in amplitudes after low doses of epinephrinine; and typical acid-base and electrolyte findings such as[] ELECTROMYOGRAPHIC RESULTS Because TPP is an acquired form of periodic paralysis, electromyographic studies during attacks of TPP show a low-amplitude compound muscle action[] […] paralysis; presence of systolic hypertension, tachycardia, high QRS voltage, first-degree atrioventricular block on electrocardiography; presence of lowamplitude electrical compound[]

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