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24 Possible Causes for Bell's Palsy, Compound Muscle Action Potential with Low Amplitude

  • Bickerstaff Brainstem Encephalitis

    […] phenomenon, and supranuclear gaze palsy.[jnnp.bmj.com] (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[ncbi.nlm.nih.gov] Bell’s phenomenon and oculocephalic reflexes were preserved. Slurred speech was present, but there was no facial or oropharyngeal palsy. There was no weakness.[doi.org]

  • Guillain-Barré Syndrome

    muscle action potentials reduced amplitude with relatively preserved conduction velocity implicates axonal neuropathy delayed/absent F waves implicates nerve root involvement[step2.medbullets.com] The differential diagnosis was between a variant of GBS and Bell's palsy.[ncbi.nlm.nih.gov] Similarly, Lewis and Morris 2 described a patient with recurrent herpes simplex associated with Bell's palsy.[jama.jamanetwork.com]

  • Miller-Fisher Syndrome

    Bell's palsy. Nonrecurrent v recurrent and unilateral v bilateral . Arch. Otolaryngol. 110 , 374–377 (1984).[nature.com] CBs resolved, distal compound muscle action potential (CMAP) amplitudes increased and SNAPs normalized on subsequent testing.[ncbi.nlm.nih.gov] Common complaints associated with cranial nerve involvement in GBS include the following: Facial droop (may mimic Bell palsy) Diplopias Dysarthria Dysphagia Ophthalmoplegia[emedicine.medscape.com]

  • Melkersson-Rosenthal Syndrome

    RESULTS: There were 16 patients with facial palsy in MRS and 860 patients with Bell's palsy involved in the study.[ncbi.nlm.nih.gov] Facial nerve conduction studies showed extremely low amplitude of compound muscle action potentials with slightly elevated distal latencies.[ncbi.nlm.nih.gov] Bell's palsy recovered completely.[ncbi.nlm.nih.gov]

  • Myasthenia Gravis

    Distinguishing features of the RNS test in LEMS and MG are confirmed in this direct comparison study: the low compound muscle action potential amplitude, decrement at LRS,[ncbi.nlm.nih.gov] A decremental pattern ( 10% difference in compound muscle action potential amplitude between the first and fourth or fifth stimulus) is the usual finding.[emedicine.com] […] immunosuppression, anti-AChR antibodies can remain undetected in the serum of seropositive patients with myasthenia gravis, leading to a false seronegative diagnosis. [24] Nerve Testing Low-rate[emedicine.com]

  • Neuropathy

    palsy) foot or shin pain, weakness or altered sensation The most common type of mononeuropathy is carpal tunnel syndrome (CTS) .[nhs.uk] Patients have relatively normal nerve conduction velocities but low amplitude sensory nerve action potentials and compound muscle action potentials.[merckmanuals.com] […] which the cause is unknown, peripheral neuropathies have many well-defined causes, including: Alcoholism Amyloidosis Autoimmune disorders, such as Guillain-Barre syndrome Bell's[ucsfhealth.org]

  • Rabies

    Motor nerve conduction studies showed decreased conduction with dispersion of compound muscle action potential, low amplitude with prolonged distal latency and decreased nerve[neurologyindia.com]

  • Leprosy

    […] of compound muscle action potentials Absent or low-amplitude sensory nerve action potentials Pattern of abnormalities suggesting mononeuropathy, mononeuropathy multiplex,[emedicine.com] […] conduction at common sites of entrapment (eg, elbow segment of the ulnar nerve) Prolonged distal latencies Reduced (sensory or motor) nerve conduction velocities Reduced amplitude[emedicine.com]

  • Neuromuscular Junction Disorder

    Bell’s Palsy Bell’s palsy is the most common cause of unilateral facial paralysis.[hqmeded.com] EMNG showed signs of myopathy and low compound muscle action potential (CMAP) amplitude (0,15 mV) on lower extremities. Muscle and nerve biopsy were normal.[neurology.org] Particular attention must be paid to compound muscle action potential (CMAP) amplitudes.[clinicalgate.com]

  • Hereditary Motor and Sensory Neuropathy

    It may be misdiagnosed as Charcot-Marie Tooth disease or Bell’s palsy. HNPP is a progressive hereditary disorder, but the symptoms can be so mild that they go unnoticed.[foundationforpn.org] Compound muscle action potentials are either absent or low amplitude with motor conduction velocities ranging from 3 to 10 meters per second.[academlib.com] Patients have relatively normal nerve conduction velocities but low amplitude sensory nerve action potentials and compound muscle action potentials.[merckmanuals.com]

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