BIA-Guided vs. Conventional Fluid Resuscitation in ICU Patients

The Body Composition Monitor (BCM) device will be used to perform daily bioelectrical impedance measurements to guide fluid resuscitation in critically ill patients after major surgery. Measurements include extracellular water, intracellular water, total body water, and phase angle. The results will be used to tailor fluid therapy.

Patients in this group will receive fluid therapy based on standard clinical parameters including blood pressure, heart rate, urine output, laboratory values, and physical examination. No bioelectrical impedance measurement will be performed.