ABSTRACT
The radioprotective effect of imidazole on the blood pressure, heart and respiratory rates was investigated in adult male rats. Whole body gamma-irradiation at a dose level of 6 Gy. exerted a significant hypotension and tachycardia after one and seven days post gamma-irradiation. There was a significant decrease in respiratory rate after one day of irradiation, but, a significant increase after 7 days, post-irradiation. Administration of imidazole [350 mg/kg] did not significantly affect the blood pressure, but significantly increased heart and respiratory rates after one and seven days of imidazole administration. Imidazole [350 mg/kg] 5-15 minutes before whole body, gamma-irradiation at a dose level of 6 Gy. significantly antagonised the effect of gamma-irradiation on blood pressure, heart and respiratory rates. Meanwhile imidazole completely abolished the effect of gamma-irradiation on the respiratory rate, but it did not completely abolish the effect on the blood pressure and heart rate. The results of the present investigation indicate that imidazole [350 mg/kg] is a good protector against gamma-irradiation induced changes on blood pressure, heart and respiratory rates