Acute effects of angiotensin II on myocardial performance

M. Broomé*, M. Haney, S. Häggmark, G. Johansson, A. Åneman, B. Biber

*Corresponding author for this work

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Abstract

Background: Specific angiotensin II (Ang II) receptors exist in many organs including peripheral blood vessels, cardiac myocytes and the central nervous system. This suggests multiple sites of actions for Ang II throughout the cardiovascular system. Cardiac effects of Ang II are not completely understood, though its prominent vasoconstrictor actions are well described. This study was designed to assess left ventricular function during administration of Ang II using relatively load-independent methods in a whole-animal model. Methods: Ang II was infused in incremental doses (0-200 μg·h -1) in anaesthetised instrumented pigs (n=10). Cardiac systolic and diastolic function were evaluated by analysis of the left ventricular pressure-volume relationship. Results: Heart rate (HR), mean arterial pressure (MAP) and systemic vascular resistance (SVR) increased dose-dependently with Ang II, while cardiac output (CO) remained unchanged. Systolic function indices, end-systolic elastance (E es) and preload recruitable stroke work (PRSW), demonstrated dose-dependent increases. The diastolic function parameter tau (τ) did not change with increasing Ang II dose. Conclusion: Ang II infusion caused increases in contractility indices in anaesthetised pigs in the doses used in this study. The mechanisms for these systolic function effects may be a direct myocardial effect or modulated through changes in autonomic nervous system activity.

Original languageEnglish
Pages (from-to)1147-1154
Number of pages8
JournalActa Anaesthesiologica Scandinavica
Volume45
Issue number9
DOIs
Publication statusPublished - 2001

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Keywords

  • Angiotensin II
  • Cardiac function
  • Conductance volumetry (non-MESH)
  • Diastolic function
  • Renin-angiotensin system
  • Systolic function
  • Vasoconstriction
  • Ventricular function

Cite this

Broomé, M., Haney, M., Häggmark, S., Johansson, G., Åneman, A., & Biber, B. (2001). Acute effects of angiotensin II on myocardial performance. Acta Anaesthesiologica Scandinavica, 45(9), 1147-1154. https://doi.org/10.1034/j.1399-6576.2001.450916.x