IV Fluid Types

An IV bag can improve tissue perfusion or worsen kidney injury. The difference depends on what the patient needs, which compartment needs fluid, how much fluid is given, and whether the kidneys can excrete the resulting sodium, chloride, and water load. Balanced crystalloids such as Lactated Ringer’s and Plasma-Lyte are the preferred first-line isotonic fluids for large-volume resuscitation in adults at risk of acute kidney injury. Their lower chloride content is less likely than a large normal-saline load to produce hyperchloraemic metabolic acidosis and renal afferent vasoconstriction. The prescription is only the beginning: response must be judged by perfusion, urine output, acid-base status, electrolytes, and evidence of fluid accumulation.