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Related Experiment Videos

Clonus depression by propranolol.

J Mai, E Pedersen

    Acta Neurologica Scandinavica
    |May 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Propranolol effectively reduced clonus in spastic patients by acting on the spinal cord. This suggests clonus involves more than just dynamic spindle activity, possibly involving an inhibitory mechanism.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Clinical Neurology

    Background:

    • Clonus is a common symptom in spasticity, characterized by involuntary muscle contractions.
    • The precise neurophysiological mechanisms underlying clonus are not fully understood.
    • Pharmacological interventions are often used to manage spasticity and its associated symptoms.

    Purpose of the Study:

    • To investigate the effect of intravenous propranolol on clonus in spastic patients.
    • To elucidate the spinal cord mechanisms through which propranolol influences clonus.
    • To determine if propranolol affects dynamic spindle activity or alpha-motoneurone excitability.

    Main Methods:

    • Intravenous administration of propranolol to patients experiencing spasticity and clonus.

    Related Experiment Videos

  • Assessment of clonus suppression following propranolol administration.
  • Electrophysiological testing of the T (Achilles tendon) reflex and H reflex to evaluate dynamic spindle and alpha-motoneurone activity.

    • Main Results:

    • Intravenous propranolol administration was found to depress clonus in spastic patients.
    • Propranolol's action was localized to the spinal cord.
    • No significant influence of propranolol was observed on dynamic spindle activity or alpha-motoneurone activity, as indicated by T and H reflexes.
    • The drug may exert its effect by disinhibiting the tonic stretch reflex.

    Conclusions:

    • Clonus in spasticity is not solely dependent on dynamic spindle activity.
    • An additional, likely inhibitory, spinal mechanism contributes to the generation of clonus.
    • Propranolol represents a potential therapeutic agent for managing clonus by modulating spinal inhibitory pathways.