Ouabain cardiotoxicity is enhanced by GABA in anesthetized rats

G. L. McLemore, M. L. Billingsley, W. B. Severs

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Potential alteration of ouabain-induced cardiotoxicity by γ-aminobutyric acid (GABA) in rats was tested by infusing ouabain for 10 min (0.7 mg/kg/min, i.v.) before or after continuous infusion of Ringer's solution with or without GABA (1 mg/min, i.v.). GABA evoked hypotension and bradycardia of similar magnitude under both conditions. The incidence of ouabain-induced ventricular fibrillation (VF) or cardiac arrest (CA) was similar in both groups. However, the time intervals to onset of VF and CA. in rats given ouabain before, but not after. GABA were shorter than in rats treated with Ringer's solution (p < 0.05). In experiments where baclofen (0.034 mg/min, i.v.) was infused after ouabain, hypotension and bradycardia occurred, but the incidence and times of ouabain-induced VF and CA were similar to control values. These results suggest that the enhancement in ouabain cardiotoxicity was mediated by GABA(A) receptors.

Original languageEnglish (US)
Pages (from-to)126-134
Number of pages9
JournalPharmacology
Volume47
Issue number2
DOIs
StatePublished - Jan 1 1993

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Ouabain
gamma-Aminobutyric Acid
Ventricular Fibrillation
Heart Arrest
Bradycardia
Hypotension
Aminobutyrates
Baclofen
Incidence
GABA-A Receptors
Cardiotoxicity

All Science Journal Classification (ASJC) codes

  • Pharmacology

Cite this

McLemore, G. L., Billingsley, M. L., & Severs, W. B. (1993). Ouabain cardiotoxicity is enhanced by GABA in anesthetized rats. Pharmacology, 47(2), 126-134. https://doi.org/10.1159/000139087
McLemore, G. L. ; Billingsley, M. L. ; Severs, W. B. / Ouabain cardiotoxicity is enhanced by GABA in anesthetized rats. In: Pharmacology. 1993 ; Vol. 47, No. 2. pp. 126-134.
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McLemore, GL, Billingsley, ML & Severs, WB 1993, 'Ouabain cardiotoxicity is enhanced by GABA in anesthetized rats', Pharmacology, vol. 47, no. 2, pp. 126-134. https://doi.org/10.1159/000139087

Ouabain cardiotoxicity is enhanced by GABA in anesthetized rats. / McLemore, G. L.; Billingsley, M. L.; Severs, W. B.

In: Pharmacology, Vol. 47, No. 2, 01.01.1993, p. 126-134.

Research output: Contribution to journalArticle

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