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Related Experiment Videos

Akathisia: selective beta-blockers and rating instruments.

L A Adler, E Duncan, A Kim

    Psychopharmacology Bulletin
    |January 1, 1989
    PubMed
    Summary

    Beta-blockers effectively treat neuroleptic-induced akathisia (NIA). Both beta-1 and beta-2 blockade helped, but clinical and electromechanical ratings for beta-2 blockade were inconsistent.

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    Area of Science:

    • Pharmacology
    • Neuroscience
    • Clinical Therapeutics

    Background:

    • Neuroleptic-induced akathisia (NIA) is a distressing side effect of antipsychotic medications.
    • Beta-blockers, such as propranolol, are recognized treatments for NIA.
    • The specific beta-receptor subtypes (beta-1 vs. beta-2) contributing to propranolol's efficacy in NIA are not fully elucidated.

    Purpose of the Study:

    • To investigate the differential contribution of beta-1 and beta-2 adrenergic receptor blockade in ameliorating NIA.
    • To compare the reliability of different rating instruments for quantifying NIA severity.

    Main Methods:

    • A beta-1 selective agent (low-dose metoprolol) and a beta-2 specific blocker (ICI 118,551) were administered to patients with NIA.
    • Clinical ratings of NIA were assessed during the metoprolol trial.

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  • Both clinical and electromechanical ratings of NIA were evaluated during the ICI 118,551 trial.

    • Main Results:

    • Both metoprolol (beta-1 selective) and ICI 118,551 (beta-2 specific) demonstrated amelioration of NIA symptoms.
    • Clinical rating scales showed consistent changes in NIA severity for most patients treated with metoprolol.
    • However, agreement between clinical and electromechanical ratings for NIA was observed in less than half of the patients receiving ICI 118,551.

    Conclusions:

    • Both beta-1 and beta-2 receptor blockade contribute to the therapeutic effects of propranolol in treating NIA.
    • While beta-1 blockade appears consistently measurable via clinical ratings, beta-2 blockade's effects on NIA may be less consistently captured by combined clinical and electromechanical assessments.
    • Further research is needed to refine NIA assessment tools, particularly for evaluating the role of specific beta-receptor subtypes.