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Related Experiment Videos

Decrease in plasma noradrenaline levels following long-term treatment with prindolol in patients with essential

H M Brecht, F Banthien, W Schoeppe

    Klinische Wochenschrift
    |November 15, 1976
    PubMed
    Summary
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    Prindolol treatment significantly lowered blood pressure and plasma noradrenaline levels in patients with essential hypertension, indicating reduced sympathetic nervous system activity and contributing to its antihypertensive effect.

    Area of Science:

    • Cardiology
    • Pharmacology
    • Hypertension Research

    Background:

    • Essential hypertension (EH) is characterized by elevated blood pressure.
    • Plasma noradrenaline (PNA) levels and sympathetic nervous system activity are often increased in EH.
    • Understanding the mechanisms of antihypertensive drugs is crucial for effective treatment.

    Purpose of the Study:

    • To investigate the effects of prindolol on blood pressure (BP) and plasma noradrenaline (PNA) in patients with essential hypertension.
    • To assess changes in sympathetic nervous system activity during prindolol treatment.
    • To explore the relationship between BP, PNA, and adrenergic response.

    Main Methods:

    • A randomized controlled trial involving 15 patients with mild to moderate essential hypertension.

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  • Patients received placebo followed by increasing doses of prindolol (mean maintenance dose 32 mg/day) for 16 weeks.
  • Blood pressure, heart rate, and plasma noradrenaline concentrations were measured under standardized conditions (supine, standing, walking) and compared to normotensive controls.

    • Main Results:

    • Prindolol treatment significantly reduced mean blood pressure from 163/113 mm Hg to 129/91 mm Hg.
    • Significantly elevated PNA levels in EH patients decreased to levels comparable to normotensive subjects after prindolol treatment.
    • The adrenergic response to upright posture, initially diminished in EH, tended towards normotensive levels with prindolol.

    Conclusions:

    • Chronic administration of prindolol effectively lowers blood pressure in essential hypertension.
    • Prindolol reduces sympathetic nervous system activity, as evidenced by decreased plasma noradrenaline levels.
    • The reduction in sympathetic activity may be a key mechanism contributing to prindolol's antihypertensive effect.