RESUMEN
<p><b>OBJECTIVE</b>To determine the effects of irrigation fluid absorption on system hemodynamics, fluid-electrolyte and hormone during mini-percutaneous nephrolithotomy.</p><p><b>METHODS</b>In this study 128 patients with renal calculus or calculus of superior ureter from January 2007 to February 2008 were collected. Hemoglobin (Hb), hematocrit (Hct), plasma osmotic pressure (POP), fluid-electrolyte, serum creatinine (Cre), renin, angiotensin II and aldosterone were determined before and after operation. Heart rate (HR), mean arterial blood pressure (MAP) and oxygen saturation (SPO(2)) were recorded dynamically every 30 min.</p><p><b>RESULTS</b>The HR speeded up accompanied with the irrigation time. When compared with before operation, POP, Cl(-), renin and Cre were significantly increased after operation; Hb, Hct and K(+) were significantly decreased after operation; MAP, SPO(2), Na(+), aldosterone and angiotensin II did not change significantly after operation. No serious surgery-related complication occurred in all patients.</p><p><b>CONCLUSIONS</b>Irrigation fluid is absorbed during mini-percutaneous nephrolithotomy. The absorption amount is positively correlated with irrigation time. Changes of hemodynamics, fluid-electrolyte balance and renin may be caused by the irrigation fluid absorption.</p>