ABSTRACT
BACKGROUND: Vasoconstrictor-induced reduction in arterial graft diameter can cause significant flow deprivation. The aim of this study was to evaluate the effect of vasodilator pretreatment on vasoconstrictor-induced blood vessel spasm in vitro. MATERIAL AND METHOD: Rabbit brachial arteries (BA) and celiac arteries (CA) were cut into rings (3~4 mm) and suspended with a force displacement transducer (TSD 125C(R), Biopac Inc. USA) in a tissue bath filled with 5 mL modified Krebs solution bubbled with 5% CO2 and 95% O2 at 38degrees C. The rings were contracted with vasoconstrictors, and the developed tension changes were considered control values. The rings were then pretreated with 30micrometer nitroglycerin, nicardipine, verapamil, and papaverine, respectively, for 40 minutes and rinsed with the physiologic buffered salt solution three times every 15 min. The vasoconstrictor-induced tension changes after the previous procedure were considered experimental values. Data are expressed as the percentage tension induced by vasoconstrictors before and after pretreatment with vasodilators. RESULT: Nicardipine depressed vasoconstriction induced by norepinephrine, angiotensin II (AII), and U46619 in both the BA and the CA more significantly than did nitroglycerin (p<0.01) and verapamil (p<0.05). Verapamil depressed vasoconstriction induced by 5-hydroxytryptamine (5HT), AII, and U46619 in the BA and by 5HT in the CA more significantly than did nitroglycerin (p<0.01). CONCLUSION: These findings suggest that both nicardipine and verapamil effectively depressed vasoconstrictor action. Nicardipine is thought to be more effective than verapamil for the prevention of vasoconstrictor action.
Subject(s)
15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid , Angiotensin II , Baths , Blood Vessels , Brachial Artery , Celiac Artery , Contracts , Displacement, Psychological , Glycosaminoglycans , Isotonic Solutions , Nicardipine , Nitroglycerin , Norepinephrine , Papaverine , Serotonin , Spasm , Transducers , Transplants , Vasoconstriction , Vasoconstrictor Agents , Vasodilator Agents , VerapamilABSTRACT
No abstract available.