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Postischemic hemodynamic changes after piroximone administration in isolated rabbit heart
W Zwölfer1, B Podesser, G Wollenek
1Department of Anesthesia and Intensive Care, University of Vienna, Austria.
Summary
Piroximone, a phosphodiesterase inhibitor, improved coronary blood flow and cardiac function after hypothermic ischemia in rabbits. This suggests piroximone
Area of Science:
- Cardiovascular Research
- Pharmacology
- Experimental Medicine
Background:
- Phosphodiesterase inhibitors are used to manage heart conditions.
- Piroximone's peripheral vasodilative effects are documented.
- Its impact on coronary circulation requires further investigation.
Purpose of the Study:
- To evaluate the effect of piroximone on hemodynamic parameters during and after hypothermic ischemia.
- To assess piroximone's influence on coronary blood flow.
- To explore piroximone as a potential agent for weaning from cardiopulmonary bypass.
Main Methods:
- An experimental study using a working heart model in 22 Elco rabbits.
- Administration of piroximone (1 mg/kg i.v.) 15 minutes pre-thoracotomy in the study group (n=10).
- Measurement of hemodynamic parameters before and after 60 minutes of hypothermic ischemia, with a control group (n=12).
Main Results:
- Pre-ischemic period showed higher coronary flow in the piroximone group.
- Post-ischemic period demonstrated significant increases in heart rate, coronary flow, aortic flow, and cardiac output in the piroximone group compared to controls.
- Piroximone administration positively influenced coronary flow.
Conclusions:
- Piroximone exhibits a positive influence on coronary flow when administered as a single preoperative dose.
- The study provides evidence of piroximone's vasodilative properties on coronary arteries.
- Piroximone may serve as an alternative tool for weaning patients from cardiopulmonary bypass.