Importance of vagally mediated bradycardia for the induction of torsade de pointes in an in vivo model

A. Farkas, J. Dempster, S.J. Coker

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Bradycardia is a risk factor for the development of torsade de pointes (TdP). The aim of this work was to compare the importance of changes in heart rate and arterial blood pressure in the development of drug-induced TdP and to investigate the role of vagal influences. Experiments were performed in open-chest, pentobarbital-anaesthetized, male rabbits which were given clofilium (20, 60 and 200 nmol kg−1 min−1) with rising doses of either phenylephrine (75, 150, 225 and 300 nmol kg−1 min−1), angiotensin II (0.25, 0.5, 0.75 and 1 nmol kg−1 min−1) or saline. A fourth group received phenylephrine and cloflium after bilateral vagotomy. ECGs, haemodynamics and epicardial monophasic action potentials were recorded. TdP occurred in 57% of rabbits given phenylephrine and clofilium. Replacement of phenylephrine with saline or angiotensin II reduced the incidence of TdP to 0 and 17%, respectively. Vagotomy prevented TdP in rabbits given phenylephrine and clofilium. Increases in blood pressure induced by phenylephrine and angiotensin II were similar. Bradycardia only occurred with phenylephrine and was reduced but not abolished by vagotomy. Neither short-term variability of repolarization nor action potential triangulation could predict TdP. These results indicate that reflex activation of vagal nerve activity is essential for the induction of drug-induced TdP in α1-adrenoceptor-stimulated anaesthetized rabbits. This implies that alterations in vagal activity may also precipitate episodes of drug-induced TdP in man and that this should be considered in selecting models used in drug development.
LanguageEnglish
Pages958-970
Number of pages12
JournalBritish Journal of Pharmacology
Volume154
Issue number5
DOIs
Publication statusPublished - 2008

Fingerprint

Torsades de Pointes
Bradycardia
Phenylephrine
Vagotomy
Angiotensin II
Rabbits
Action Potentials
Pharmaceutical Preparations
Essential Drugs
Pentobarbital
Adrenergic Receptors
Reflex
Arterial Pressure
Electrocardiography
Thorax
Heart Rate
Hemodynamics
Blood Pressure
Incidence

Keywords

  • bradycardia
  • clofilium
  • proarrhythmia
  • repolarization
  • short-term variability
  • torsade de pointes
  • triangulation
  • vagotomy

Cite this

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title = "Importance of vagally mediated bradycardia for the induction of torsade de pointes in an in vivo model",
abstract = "Bradycardia is a risk factor for the development of torsade de pointes (TdP). The aim of this work was to compare the importance of changes in heart rate and arterial blood pressure in the development of drug-induced TdP and to investigate the role of vagal influences. Experiments were performed in open-chest, pentobarbital-anaesthetized, male rabbits which were given clofilium (20, 60 and 200 nmol kg−1 min−1) with rising doses of either phenylephrine (75, 150, 225 and 300 nmol kg−1 min−1), angiotensin II (0.25, 0.5, 0.75 and 1 nmol kg−1 min−1) or saline. A fourth group received phenylephrine and cloflium after bilateral vagotomy. ECGs, haemodynamics and epicardial monophasic action potentials were recorded. TdP occurred in 57{\%} of rabbits given phenylephrine and clofilium. Replacement of phenylephrine with saline or angiotensin II reduced the incidence of TdP to 0 and 17{\%}, respectively. Vagotomy prevented TdP in rabbits given phenylephrine and clofilium. Increases in blood pressure induced by phenylephrine and angiotensin II were similar. Bradycardia only occurred with phenylephrine and was reduced but not abolished by vagotomy. Neither short-term variability of repolarization nor action potential triangulation could predict TdP. These results indicate that reflex activation of vagal nerve activity is essential for the induction of drug-induced TdP in α1-adrenoceptor-stimulated anaesthetized rabbits. This implies that alterations in vagal activity may also precipitate episodes of drug-induced TdP in man and that this should be considered in selecting models used in drug development.",
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Importance of vagally mediated bradycardia for the induction of torsade de pointes in an in vivo model. / Farkas, A.; Dempster, J.; Coker, S.J.

In: British Journal of Pharmacology, Vol. 154, No. 5, 2008, p. 958-970.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Importance of vagally mediated bradycardia for the induction of torsade de pointes in an in vivo model

AU - Farkas, A.

AU - Dempster, J.

AU - Coker, S.J.

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AB - Bradycardia is a risk factor for the development of torsade de pointes (TdP). The aim of this work was to compare the importance of changes in heart rate and arterial blood pressure in the development of drug-induced TdP and to investigate the role of vagal influences. Experiments were performed in open-chest, pentobarbital-anaesthetized, male rabbits which were given clofilium (20, 60 and 200 nmol kg−1 min−1) with rising doses of either phenylephrine (75, 150, 225 and 300 nmol kg−1 min−1), angiotensin II (0.25, 0.5, 0.75 and 1 nmol kg−1 min−1) or saline. A fourth group received phenylephrine and cloflium after bilateral vagotomy. ECGs, haemodynamics and epicardial monophasic action potentials were recorded. TdP occurred in 57% of rabbits given phenylephrine and clofilium. Replacement of phenylephrine with saline or angiotensin II reduced the incidence of TdP to 0 and 17%, respectively. Vagotomy prevented TdP in rabbits given phenylephrine and clofilium. Increases in blood pressure induced by phenylephrine and angiotensin II were similar. Bradycardia only occurred with phenylephrine and was reduced but not abolished by vagotomy. Neither short-term variability of repolarization nor action potential triangulation could predict TdP. These results indicate that reflex activation of vagal nerve activity is essential for the induction of drug-induced TdP in α1-adrenoceptor-stimulated anaesthetized rabbits. This implies that alterations in vagal activity may also precipitate episodes of drug-induced TdP in man and that this should be considered in selecting models used in drug development.

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KW - clofilium

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KW - triangulation

KW - vagotomy

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