Cytoprotective effects of octreotide, prostaglandin E1 and diltiazem on experimental hepatic ischemia/reperfusion models SICANLARDA HEPATIK ISKEMI/REPERFUZYON MODELI UZERINE SOMATOSTATIN ANALOGU OKTREOTID, PROSTAGLANDIN E1 VE DILTIAZEMIN SITOPROTEKTIF ETKISI