Hyponatremia in a Patient With Vasodilatory Shock Due to Overdose of Antihypertensive Medications: A Case Report

Overview

Journal Cureus

Specialty Biomedical Engineering

Date 2023 Oct 13

PMID 37829951

Authors

Abdul Hannan A Rasheed

Kavitha Vellanki

Frank Woo

David J Leehey

Affiliations

Soon will be listed here.

Abstract

Vasodilatory shock can be caused by septic shock, neurogenic shock, anaphylaxis, drugs, and toxins. Vasopressin is commonly used for the restoration of vasomotor tone in vasodilatory shock due to sepsis. This agent exerts its vasoconstrictive effect via smooth muscle V1 receptors and has antidiuretic activity via kidney V2 receptors. Stimulation of V2 receptors results in the integration of aquaporin 2 channels into the apical membrane of collecting ducts leading to free water reabsorption. This antidiuretic action of vasopressin predisposes to hyponatremia. Yet, the development of hyponatremia with the use of vasopressin in critically ill patients with sepsis is rare. A 75-year-old female presented after a suicidal attempt by ingestion of amlodipine and lisinopril. Despite adequate intravenous fluids administration, she remained hypotensive, requiring the initiation of vasopressors. She developed hyponatremia after initiation of vasopressin due to the absence of endotoxemia, and her serum sodium normalized once vasopressin was discontinued. We recommend monitoring for hyponatremia as a complication of vasopressin, especially in patients without sepsis.

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