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Alterations in Muscle Tone ll01:12

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Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...

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Abnormal motor cortex excitability in congenital stroke.

Steffen Berweck1, Michael Walther, Verena Brodbeck

  • 1Department of Pediatric Neurology and Developmental Medicine, Dr. von Hauners' Children's Hospital of the University of Munich, 80337 Munich, Germany. steffen.berweck@med.uni-muenchen.de

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|November 29, 2007
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Summary

Congenital stroke patients exhibit reduced corticospinal excitability and increased intracortical excitability, similar to adult stroke. These findings suggest neuronal damage and potential compensatory mechanisms in congenital stroke survivors.

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Area of Science:

  • Neuroscience
  • Neurology
  • Rehabilitation Medicine

Background:

  • Stroke sequelae in adults typically involve reduced corticospinal excitability and increased intracortical excitability.
  • Congenital stroke, acquired before or during birth, presents unique challenges in understanding long-term neurological effects.

Purpose of the Study:

  • To investigate corticospinal and intracortical excitability in individuals with congenital stroke.
  • To compare neurophysiological findings in congenital stroke with those observed in adult stroke.

Main Methods:

  • Utilized single and paired pulse transcranial magnetic stimulation (TMS) in ten congenital stroke patients and eight healthy controls.
  • Measured motor threshold (MT), short-interval intracortical inhibition (SICI), and intracortical facilitation (ICF).

Main Results:

  • Patients with congenital stroke showed significantly elevated MT, indicating reduced corticospinal excitability.
  • Significantly reduced SICI was observed in congenital stroke patients, suggesting increased intracortical excitability.
  • No significant differences in intracortical facilitation (ICF) were found between groups.

Conclusions:

  • Findings in congenital stroke patients mirror those in adult stroke, suggesting neuronal damage as a cause of reduced corticospinal excitability.
  • Reduced intracortical inhibition in congenital stroke may indicate deficient inhibitory cortical properties or compensatory mechanisms for plasticity.