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Open Access Cardiovascular Responses to Propofol and Etomidate in Long-Term Instrumented Rhesus Monkeys (Macaca mulatta)

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Background and Purpose: Cardiac and arterial responses to prescribed doses of propofol and etomidate in rhesus monkeys were compared.

Methods: Intravenously administered induction doses of propofol (2 mg/kg of body weight) or etomidate (1 mg/kg) followed by continuous intravenous infusions of propofol (200 g/kg/min) or etomidate (100 g/kg/min) were administered. Left ventricular and right atrial access catheters were implanted for long-term use, along with a transittime flow probe on the ascending aorta, and pericardial electrocardiogram leads. A dual sensor 3-F micromanometer was used to measure left ventricular pressure and aortic pressure, and an active redirectional transit-time probe measured aortic flow. Noordergraaf 's four-element model was used to estimate total peripheral resistance and systemic arterial compliance.

Results: Significant (P < 0.01) decreases in mean arterial pressure, heart rate, and myocardial contractility were accompanied by an increase in systemic arterial compliance associated with propofol and etomidate. Only minimal changes in left ventricular diastolic pressure, cardiac output, stroke volume, and total peripheral resistance were found for both drugs. The changes associated with propofol are comparable to results in human beings, whereas the changes associated with etomidate did not agree with results of published human studies.

Conclusion: The significant cardiovascular alterations associated with both agents were attributed to reductions in heart rate, although the possibility exists that negative inotropic effects may have had a role.

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Document Type: Research Article

Publication date: 01 June 2000

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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