New contributions of the thesis The dissertation contributes to compare the effect of 2 types of irrigating solution 3% sorbitol or 0.9% NaCl on some test indicators of patients undergoing transurethral resection of prostate and confirming hyponatremia associated with transurethral resection (TUR) syndrome with manifestations clinical still occurs when using 3% sorbitol irrigating solution, while clarifying some factors related to dilution of hyponatremia and clinical manifestations.