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Ann Thorac Surg 1978;25:340-345
© 1978 The Society of Thoracic Surgeons
Department of Surgery, Section of Thoracic Surgery, and the Department of Pharmacology, the University of Michigan Medical Center, Ann Arbor, MI.
Accepted for publication October 17, 1977.
* Address reprint requests to Dr. Kirsh, C7175 University Hospital, Ann Arbor, MI 48109
Eleven adult mongrel dogs were divided into two groups. Group 1 animals served as controls and Group 2 received propranolol (6 mg/kg/ day) orally in divided doses for 15 to 21 days. Prior to cardiopulmonary bypass, cardiac output, first derivative of left ventricular pressure (dp/dt), peak systolic pressure, heart rate, and central venous pressure were recorded. The animals were then placed on cardiopulmonary bypass and subjected to 30 minutes of global ischemia at the myocardial temperature of 32°C.
Following cessation of cardiopulmonary bypass the baseline studies were repeated. In Group 2 animals following the repeat studies, glucagon was administered at a rate of 0.13 µg/kg/min. The cardiac index and dp/dt were decreased by 43.3% (p < 0.001) and 40.5% (p < 0.001) in comparison to Group 1 animals. In Group 2 dogs, after bypass and glucagon infusion, cardiac index increased by 38% (p < 0.02), dp/dt rose by 78% (p < 0.05), and peak systolic pressure increased by 24.8% (p < 0.05).
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