Cardiovascular and respiratory effects of acetylpromazine and xylazine on halothane-anesthetized horses.

Eugene Steffey, A. B. Kelly, Thomas B Farver, M. J. Woliner

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Circulatory and respiratory effects of intravenously administered acetylpromazine (0.033 and 0.067 mg/kg) and xylazine (0.5 and 1.0 mg/kg) were studied in drug cross-over fashion in eight laterally recumbent horses anesthetized only with halothane (1.06%, end-tidal) in O2. Both doses of acetylpromazine caused a significant and sustained elevation in cardiac output via a rise in stroke volume. Xylazine produced an initial significant fall in cardiac output followed by a return to control levels. Halothane anesthesia did not prevent xylazine-related atrioventricular conduction block. All treatments caused a similar significant fall in arterial blood pressure (acetylpromazine, total peripheral resistance-related; xylazine, cardiac output-related). PaCO2 significantly increased after all treatments. PaCO2 decreased significantly only following xylazine treatment. One horse (not included in the tabulation) developed ventricular fibrillation and died 15 min after receiving its first injection (0.5 mg/kg) of xylazine.

Original languageEnglish (US)
Pages (from-to)290-302
Number of pages13
JournalJournal of Veterinary Pharmacology and Therapeutics
Volume8
Issue number3
StatePublished - Sep 1985

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Acepromazine
Xylazine
xylazine
halothane
Halothane
Horses
horses
cardiac output
Cardiac Output
Atrioventricular Block
Ventricular Fibrillation
stroke
Vascular Resistance
Stroke Volume
blood pressure
anesthesia
Arterial Pressure
Therapeutics
Anesthesia
injection

ASJC Scopus subject areas

  • Pharmacology
  • veterinary(all)

Cite this

Cardiovascular and respiratory effects of acetylpromazine and xylazine on halothane-anesthetized horses. / Steffey, Eugene; Kelly, A. B.; Farver, Thomas B; Woliner, M. J.

In: Journal of Veterinary Pharmacology and Therapeutics, Vol. 8, No. 3, 09.1985, p. 290-302.

Research output: Contribution to journalArticle

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