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Related Experiment Videos

Hypertension after clonidine overdose. A case report.

M Lilja, M Hakala, A J Jounela

    Annals of Clinical Research
    |January 1, 1984
    PubMed
    Summary

    A woman experienced a severe hypertensive reaction after intentionally taking a large dose of clonidine. This case highlights the drug's potential for paradoxical hypertension due to alpha-adrenoceptor stimulation.

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    Area of Science:

    • Pharmacology
    • Toxicology
    • Nephrology

    Background:

    • Clonidine is an antihypertensive medication that acts as an alpha-2 adrenergic agonist.
    • Overdose of clonidine can lead to complex cardiovascular and neurological effects.
    • Renal failure can alter drug metabolism and excretion, potentially increasing toxicity.

    Observation:

    • A 28-year-old woman with renal failure intentionally ingested 30-70 tablets of clonidine (150 micrograms each).
    • She presented with severe hypertension (210/150 mmHg) and increasing drowsiness.
    • Her blood pressure gradually decreased over 16 hours, coinciding with a plasma clonidine level of 4.7 ng/ml.

    Findings:

    • The patient exhibited an unusual hypertensive reaction following clonidine overdose.
    • This hypertensive response is hypothesized to result from excessive stimulation of peripheral postsynaptic alpha-adrenoceptors.
    • The clinical presentation suggests a complex dose-dependent and receptor-mediated effect of clonidine.

    Implications:

    • This case underscores the importance of monitoring blood pressure in clonidine overdose, even with initial sedation.
    • It highlights a potential mechanism of paradoxical hypertension in clonidine toxicity, distinct from its central hypotensive effects.
    • Understanding these receptor-mediated effects is crucial for managing severe clonidine poisoning, especially in patients with impaired renal function.

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