[Analysis of serum electrolytes in urolithiasis patients].

Objective: To define the difference of serum calcium (Ca), phosphorus (P), potassium (K), sodium (Na), chlorine (Cl), carbon dioxide combining power (CO2CP), hydrogen ion concentration (pH) of urine and urine specific gravity (SG) between those patients suffering from urolithiasis and non-urolithiasis at the same time period.

Methods: Data from 1 164 patients admitted to the Department of Urology, Peking University People's Hospital from January, 2005 to July, 2007 were retrospectively reviewed. Seven hundred fourteen patients suffered from urolithiasis, and 450 patients were diagnosed as non-urolithiasis. Blood and urine were taken from the patient the next morning after admission. Serum levels of Ca, P, K, Na, Cl, CO2CP and urine pH and SG were checked by automatic biochemistry analyzer. The data were analyzed by software SPSS 13.0.

Results: Patients' ages in urolithiasis group varied from 5 to 87 years and the male to female ratio was 1.8:1. The patients in non-urolithiasis group aged from 12 to 94 years and the male to female ratio was 3.8:1. There was difference in the levels of serum Na, K, Cl, CO2CP, Ca and P between urolithiasis and non-urolithiasis groups (P<0.05). In male patients, serum Na, Ca and P levels in urolithiasis group were higher than those in non-urolithiasis group(P<0.05), serum K and urine pH levels were lower in urolithiasis group than those in non-urolithasis group (P<0.05). In female patients, serum Na level was higher in urolithiasis group than that in non-urolithiasis group (P=0.080). Logistic regression analysis showed that beta value of serum Na level in male and female group was 0.10 (P<0.01) and 0.09 (P=0.054) respectively.

Conclusion: There was difference in serum electrolyte levels between urolithiasis group and non-urolithiasis group. The chang of serum Na level may play role in pathogenesis of urolithiasis.