Effect of bunazosin, a selective alpha 1-adrenoceptor blocker, on ischemic myocardium in perfused rat heart.
The effects of bunazosin on the ischemic myocardium were investigated in isolated, perfused working rat hearts. Ischemia decreased the pressure-rate product and tissue adenosine triphosphate and creatine phosphate levels. Reperfusion did not restore the pressure-rate product nor the adenosine triphosphate levels completely. Bunazosin (5 x 10(-7) and 5 x 10(-6) mol/L) preserved the levels of adenosine triphosphate and creatine phosphate after 20 minutes of ischemia and increased the extent of recovery of the pressure-rate product during reperfusion. The results suggest that bunazosin protects the myocardium against ischemic damage.
First Department of Internal Medicine, Asahikawa Medical College, Japan.
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T
Haneda
H
H
Tanaka
M
M
Abe
H
H
Obata
S
S
Onodera
D000255:Adenosine Triphosphate / Q000378:metabolism; D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology*; D000818:Animals; D003326:Coronary Circulation / Q000187:drug effects*; D006321:Heart / Q000187:drug effects*; D007511:Ischemia / Q000517:prevention & control; D008297:Male; D015425:Myocardial Reperfusion; D009206:Myocardium / Q000378:metabolism; D010477:Perfusion; D010725:Phosphocreatine / Q000378:metabolism; D011799:Quinazolines / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains
D000317:Adrenergic alpha-Antagonists; D011799:Quinazolines; D010725:Phosphocreatine; D000255:Adenosine Triphosphate; C018176:bunazosin