Hyperchloremia

This study aims to evaluate the changes between preoperative and postoperative serum chloride levels in patients undergoing HoLEP surgery and to investigate the metabolic and clinical effects of this change. The study is observational, and no additional interventions will be performed.

Normal saline (0.9% sodium chloride), a classical crystalloid solution, is widely used to maintain fluid balance, volume resuscitation and dilute drugs during clinical practice. However, the chloride concentration of normal saline (154mmol/L) is much higher than human plasma, and a large amount of infusion may lead to iatrogenic hyperchloremia in ICU patients. In contrast, the concentrations of Multiple electrolytes II is more similar to those of plasma and is considered to be a better fluid choice than normal saline.