Intravenous fluid administration and urine output during radical neck surgery

Area of Science:

• Anesthesiology
• Nephrology
• Surgical Oncology

Background:

• Perioperative fluid management is critical in major surgeries.
• Maintaining adequate renal perfusion and urine output (UO) is a common goal.
• The necessity of high intraoperative UO in patients with normal renal function is debated.

Purpose of the Study:

• To investigate the impact of intraoperative fluid administration on urine output and hemodynamics.
• To test the hypothesis that urine output is not critical if hemodynamics are maintained in patients with normal renal function.
• To evaluate the renal and hemodynamic outcomes of fluid restriction during radical head and neck surgery.

Main Methods:

• A prospective study involving 24 patients undergoing radical head and neck surgery.
• Patients were divided into two groups: 'wet' (generous IV fluids) and 'dry' (fluid restriction).
• Perioperative urine output and systemic/pulmonary hemodynamics were monitored.

Main Results:

• The 'dry' group received significantly less IV fluid (426 mL/h) compared to the 'wet' group (1018 mL/h).
• Intraoperative and postoperative UO were significantly lower in the 'dry' group (0.39 and 1.1 mL/kg/h) versus the 'wet' group (1.33 and 1.9 mL/kg/h).
• No significant differences in perioperative hemodynamics or postoperative renal function were observed between the groups.

Conclusions:

• Intraoperative oliguria resulting from moderate fluid restriction is not detrimental to renal outcomes when hemodynamics are stable.
• Maintaining systemic hemodynamics is more crucial than achieving high urine output in this patient population.
• Fluid restriction may offer additional patient benefits without compromising renal function or hemodynamics.