Persistent Cardioprotection by Azapropazone in a Canine Model of Coronary Artery Thrombosis and Thrombolysis
| Autor: | George A. Boswell, Andrew W. Leamy, Pieter B.M.W.M. Timmermans, Martin J.M.C. Thoolen, Denver P. Fernando, Dolores E. Rasbach, William M. Mackin, Robert M. Knabb |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Apazone
Male medicine.drug_class Streptokinase Myocardial Infarction Ischemia Collateral Circulation Dogs Coronary thrombosis Coronary Circulation medicine Animals Thrombolytic Therapy Xanthine oxidase inhibitor Azapropazone Pharmacology business.industry Coronary Thrombosis Hemodynamics Heart medicine.disease Thrombosis medicine.anatomical_structure Blood pressure Anesthesia Regression Analysis Female Cardiology and Cardiovascular Medicine business Artery medicine.drug |
| Zdroj: | Journal of Cardiovascular Pharmacology. 17:390-396 |
| ISSN: | 0160-2446 |
| DOI: | 10.1097/00005344-199103000-00006 |
| Popis: | Activated neutrophils and possibly xanthine oxidase-derived free radicals are believed to be mediators of ischemia and reperfusion-induced myocardial damage. We studied the cardioprotective effect of the neutrophil stabilizer and xanthine oxidase inhibitor azapropazone in dogs subjected to thrombotic occlusion of the left anterior descending coronary artery (LAD), induced by intracoronary introduction of a copper coil, followed 60 min later by thrombolytic treatment with intracoronary streptokinase and 4-day reperfusion; we then determined infarct size by triphenyltetrazolium stain. Azapropazone [100 mg/kg intravenously (i.v.) followed by a 24-h i.v. infusion of 10 mg/kg/h, n = 8] or vehicle (n = 10) treatments were started immediately before the streptokinase infusion. Steady-state plasma levels of azapropazone ranged from 97 to 163 micrograms/ml during the infusion. Myocardial blood flow and underperfused area at risk were determined using radiolabeled microspheres. Results were as follows (mean +/- SEM): area at risk (percentage of left ventricle) azapropazone 22.7 +/- 3.16 and vehicle 21.8 +/- 4.13; infarct size (percentage of area at risk), azapropazone 45.1 +/- 11.8 and vehicle 75.7 +/- 10.6, p less than 0.03; collateral blood flow (ml/min/g), azapropazone 0.27 +/- 0.02 and vehicle 0.23 +/- 0.02; total ischemic period (min), azapropazone 106 +/- 5.9 and vehicle 91.5 +/- 4.9. Azapropazone had no effects on heart rate (HR), blood pressure (BP), or rate/pressure product (RPP). These dta show that azapropazone limits infarct size in a canine model of coronary thrombosis and long-term reperfusion and that this cardioprotection is independent of cardiovascular parameters. |
| Databáze: | OpenAIRE |
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