Abstract
Oxidative stress parameters and erythrocyte characteristics were studied in 15 normal healthy dogs and 33 renal azotaemic dogs from Small Animal Hospital, Faculty of Veterinary Science, Chulalongkorn University. Dogs with renal azotaemia had reduced mean corpuscular volume (MCV) ( P < 0.01), packed cell volume (PCV) ( P < 0.001) and increased mean corpuscular hemoglobin concentration (MCHC) ( P < 0.001). The relationship was found between degree of azotaemia and MCV, PCV and MCHC. Dogs with severe renal azotaemia had higher intraerythrocytic sodium contents (RBC-Na) ( P < 0.05). The red blood cell catalase activity and glutathione and plasma malondialdehyde were unaltered while urinary malondialdehyde-creatinine ratio (U-MDA/Cr) increased significantly ( P < 0.001). The U-MDA/Cr was correlated significantly with plasma creatinine concentration ( P < 0.05), urinary protein-creatinine ratio ( P < 0.05) and fractional excretion of sodium ( P < 0.001). The results suggest some changes in RBC characteristics and urine oxidative stress marker in renal azotaemic dogs. Moreover, the U-MDA/Cr is a sensitive biochemical parameter which increased along with degree of renal dysfunction.
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