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26 Possible Causes for Electromyogram Abnormal, Percussion Myotonia

  • Myotonia Congenita

    The diagnosis were based upon family history, clinical findings of percussion myotonia, had grip myotania, prominent muscular hypertrophy and confirmed by electromyographic[ncbi.nlm.nih.gov] The electromyogram tests the electrical impulses from the affected muscles. The abnormal repetitive impulses can confirm this disease.[symptoma.com] Distribution/anatomy Time course Onset/age Myotonia is usually mild, approximately 50% may have percussion myotonia.[rrnursingschool.biz]

  • Myotonic Dystrophy

    Percussion myotonia or myotonia of grasp or both is usually present if looked for.[pediatrics.aappublications.org] The less common clinical syndromes, which include the two possible cases of myotonic dystrophy, are: (2) almost pure myotonia, symptomatic from early infancy (one case) or[pediatrics.aappublications.org]

  • Muscular Dystrophy

    Myotonia (prolonged muscle contraction) occurs spontaneously or is elicited by voluntary activity or by mild stimulation, such as tapping on a muscle (percussion myotonia)[neuropathology-web.org] […] typically elicited by percussion of the thenar eminence with a tendon hammer—‘percussion myotonia’.[doi.org] Handgrip myotonia and strength may improve with repeated contractions—‘warm up phenomenon’. 28 The warm up phenomenon can also improve speech production. 29 Myotonia can be[doi.org]

  • Secondary Myopathy

    Muscle hypertrophy may be seen Grip and percussion myotonia can be seen Tx : Mexiletene.[sites.google.com] Although changes seen on electromyography are not pathognomonic for any specific disease process, an abnormal electromyogram can indicate if a neuropathy or neuromuscular[aafp.org] electromyograms, evocative muscle biopsy and an abnormal signal on muscle magnetic resonance imaging.[err.ersjournals.com]

  • Generalized Myotonia of Thomsen

    On examination he showed percussion myotonia. There was no grip myotonia or eyelid myotonia. Nerve conduction studies were normal.[jnnp.bmj.com] Electromyogram – Looks for muscle damage. Electrocardiogram – Checks for abnormalities in the heartbeat.[drugs.com] Secondary outcomes: (1) clinical relaxation time; (2) electromyographic relaxation time; (3) stair test; (4) presence of percussion myotonia; and (5) adverse events.[cochrane.org]

  • Myopathy

    Myotonia can be elicited by percussion, occurs by impaired relaxation of muscle due to repetitive depolarization of the muscle.[doi.org] Electroencephalographic abnormalities have been noted in several patients with the early-onset form of the disease before clinically apparent seizure activity begins.[anesthesiology.pubs.asahq.org] Look for other associated signs including myotonia, paramyotonia, and muscle hypertrophy to exclude other non-systemic causes of muscle weakness.[doi.org]

  • Limb-Girdle Muscular Dystrophy

    Patients with myotonic dystrophy type 1 may present subtle myotonia and it may be necessary to search for tenar muscle percussion myotonia 15.[doi.org]

  • Neuromuscular Junction Disorder

    Myotonia classically improves with repeated exercise, and worsens with exposure to cold.[nature.com] Despite its importance, patients seldom complain of myotonia, and instead complain of distal weakness.[nature.com] It most commonly involves the hands, tongue, and eyelids, and can be demonstrated at the bedside by percussion of the thenar eminence, wrist extensors, or tongue.[nature.com]

  • Oppenheim Disease

    […] by cold, pressure, and percussion of enlarged muscles: later portrayed as “The Infant Hercules”.[jnnp.bmj.com] Myotonia congenita (Thomsen’s disease) was described by Asmus Julius Thomsen (1815–1896) in 1876 in his own family, who showed episodic myotonic contractions, precipitated[jnnp.bmj.com]

  • Schwartz-Jampel Syndrome

    Further investigation showed some typical facial features of the syndrome, percussion myotonia and abnormal EMG pattern characterized by continuous muscle activity at rest[ncbi.nlm.nih.gov] These clinical findings, along with abnormal electromyogram and muscle biopsy, are consistent with Schwartz-Jampel syndrome.[ncbi.nlm.nih.gov] He had diffuse muscular hypertrophy and stiffness with eyelid myotonia, tongue myotonia, percussion myotonia at thenar eminence [Figure 2] and forearm muscles.[amhsjournal.org]

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