Hemodynamic and cardiac effects of spiraprilat in normal and sodium depleted conscious dogs.

Abstract

The cardiac and hemodynamic effects of 3 doses (0.1, 0.3 and 1 mg/kg, iv) of spiraprilat, the diacid active metabolite of the new angiotensin I converting enzyme inhibitor spirapril, have been investigated and compared to those of saline in chronically implanted conscious dogs at rest. Under a normal sodium diet, spiraprilat, 1 mg/kg, induced significant (at least P less than 0.05) decreases in mean arterial pressure (MAP, -11%), total peripheral resistance (TPR, -21%), left ventricular end diastolic pressure (LVEDP, -15%) and increases in heart rate (HR, +12%) and cardiac output (CO, +16%) whereas dP/dtmax remained unchanged. Spiraprilat-induced tachycardia was not modified by propranolol pre-treatment but was abolished by previous administration of the propranolol-N-methylatropine combination. Spiraprilat, 0.1 mg/kg, did not affect any parameter, but spiraprilat, 0.3 mg/kg, showed intermediate effects. Finally, sodium depletion strongly potentiated spiraprilat effects on MAP, TPR, LVEDP, HR and CO. We conclude that: a), in conscious dogs under normal sodium diet, spiraprilat reduces TPR and MAP through peripheral vasodilating properties; b), spiraprilat-induced tachycardia is mainly related to parasympathetic tone withdrawal, possibly in relation with high and low pressure baroreceptors deactivation; and c), sodium depletion considerably potentiates spiraprilat cardiac and hemodynamic effects.

• Authors: J L Gérard, E Pussard, A Berdeaux, J F Giudicelli
• Journal: Fundamental & clinical pharmacology (Fundam Clin Pharmacol) Vol. 4 Issue 5 Pg. 547-58 ( 1990) ISSN: 0767-3981 [Print] England
• PMID: 2289746 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Angiotensin-Converting Enzyme Inhibitors
• Sodium Chloride
• Enalapril
• spirapril
• Sodium

Topics

• Angiotensin-Converting Enzyme Inhibitors (pharmacology)
• Animals
• Blood Pressure (drug effects)
• Cardiac Output (drug effects)
• Dogs
• Enalapril (analogs & derivatives, pharmacology)
• Female
• Heart (drug effects)
• Heart Rate (drug effects)
• Hemodynamics (drug effects)
• Male
• Sodium (deficiency)
• Sodium Chloride (pharmacology)