The Effect of Losartan on the Levels of Nitric Oxide in Internal Thoracic Artery, Radial Artery and Saphenous Ven Grafts in Coronary Artery Bypass Surgery

Abstract

Objective: Graft exposure time in coronary artery surgery depends on endothelial function. The beneficial effect of nitricoxide on endothelial function is known. Nitricoxide level in grafts and the effect of Losartan on nitricoxide were investigated as in vitro. Methods: The study was carried out with 78 samples in 13 patients. Internal thoracic artery, radial artery and saphenous vein graft samples were divided into "Control Group" and "Losartan Group". Statistical evaluation was performed using Kruskal Wallis Oneway ANOVA, Independent sample T, Tukey and Bonferroni tests. Results: The baseline Nitric Oxide value in the control group was significantly higher in the internal thoracic artery graft (p<0.05). Nitric Oxide increase was not found significant in losartan group internal thoracic artery and radial artery grafts. Coclusion: The internal thoracic artery is the graft with the longest patency; because NitricOxide is high level in endothelial tissue. Theuse of spasmolytic drugs for the patency of the grafts also provides positive use. Nitric Oxide increase is positive in the internal thoracic artery and radial arteries, but it will be supported by new studies.

Keywords

• CABG
• graft potency
• losartan
• nitric oxide

Koroner Arter Bypass Cerrahisinde Losartan’ın İnternal Torasik Arter, Radial Arter ve Safen Ven Greftlerindeki Nitrik Oksit Düzeyine Etkisi

Abstract

Amaç: Koroner arter cerrahisinde greft açık kalma süresi endotel fonksiyonuna bağlıdır. Nitrik Oksitin (NO) endotel fonksiyonuna yararlı etkisi bilinmektedir. Greftlerdeki Nitrik Oksit düzeyi ve Losartan’ın Nitrik Oksit üzerine etkisi invitro olarak araştırılmıştır. Yöntem: Çalışma 13 hasta da 78 örnek ile yapıldı. İnternaltorasik arter, radial arter ve safenvengreft örnekleri “Kontrol Grubu” ve “Losartan Grubu” olmak üzere ikiye ayrıldı. Losartan grubu örnekleri 1 x 10-5molar Losantanlı Troyde’s solüsyonu çözeltisi içinde inkübe edildi. Nitrik Oksit, Griess yöntemi kullanılarak ölçüldü. İstatistiksel değerlendirme. Kruskal Wallis Oneway ANOVA, İndependentsample T ile Tukey ve Bonferroni testleri kullanılarak yapıldı. Bulgular: Kontrol grubu bazal Nitrik Oksit değeri, internaltorasik arter greftinde anlamlı olarak yüksek bulunmuştur (p<0,05). Losartan grubu internal torasik arter ve radial arter greftlerinde Nitrik Oksit artışı anlamlı değildir. Sonuç: İnternal torasik arter en uzun açık kalma süresine sahip greftir, çünkü endotelinde Nitrik Oksit düzeyi yüksektir. Spasmolitik ilaçların kullanımı da greft açık kalma süresini olumlu etkiler. Losartan İnternal torasik arter ve radial arterlerde Nitrik Oksit düzeyini artırması olumludur fakat yeni çalışmalarla da desteklenmelidir.

Keywords

• cabg
• losartan
• nitrik oksit
• greft açıklığı

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