*Fluid management in a patient with deranged renal function tests (RFTs) depends on the patient's volume status, not simply on the elevated urea or creatinine.* Giving too much or too little fluid can both be harmful. ⭕*Step 1: Assess volume status* Decide whether the patient is: *1. Hypovolemic (dehydrated) 2. Euvolemic 3. Hypervolemic (fluid overloaded)* *This is the most important step.* --- ⭕*A. Hypovolemic AKI (Prerenal AKI)* Clinical features Hypotension Tachycardia Dry mucous membranes Reduced skin turgor Low urine output *Treatment* Give 0.9% normal saline or a balanced crystalloid (e.g., Ringer's lactate if appropriate). *Initial bolus:* 500–1000 mL IV over 15–30 minutes in adults. *Reassess after each bolus:* Blood pressure Pulse Urine output Lung examination *Monitoring* Urine output hourly Daily weight Serum creatinine Electrolytes (especially potassium) Repeat RFTs daily or more frequently if unstable --- *⭕B. Euvolemic AKI* *Examples:* Acute tubular necrosis Drug-induced kidney injury *Treatment* Avoid unnecessary IV fluids. Maintain normal hydration. Stop nephrotoxic drugs (NSAIDs, ACE inhibitors/ARBs if appropriate, aminoglycosides). *Treat the underlying cause.* --- *⭕C. Hypervolemic AKI* *Clinical features* Leg edema Raised JVP Pulmonary edema Breathlessness Hypertension *Treatment* Restrict fluids. Restrict sodium. IV loop diuretic (e.g., furosemide) if the patient is likely to respond. Dialysis if indicated. --- *How much fluid should be given?* There is no fixed amount. The dose depends on: Blood pressure Urine output Cardiac function Degree of dehydration *For hypovolemia:* Start with 500–1000 mL isotonic crystalloid. Reassess before giving more. --- *⭕Daily fluid requirement* If the patient is oliguric and not dehydrated: Daily fluid allowance ≈ Previous 24-hour urine output + 500 mL (to replace insensible losses) Example: Urine output = 400 mL/day Daily fluids ≈ 900 mL/day This is a common approach in oliguric AKI, but it should be individualized based on ongoing losses and clinical status. --- ⭕*Monitor carefully* Check: Blood pressure Heart rate Urine output (target *≥0.5 mL/kg/hour in adults*) Daily weight Lung auscultation Serum creatinine Urea Potassium Sodium Bicarbonate --- Indications for dialysis (AEIOU) *⭕Remember AEIOU:* *A – Acidosis* (severe metabolic acidosis not responding to treatment) *E – Electrolyte* abnormalities (especially refractory hyperkalemia) *I – Intoxications* (certain dialyzable toxins) *O – Overload* (pulmonary edema not responding to diuretics) *U – Uremia* (e.g., encephalopathy, pericarditis, severe symptoms) --- *Exam summary* Volume status Fluid management Hypovolemic 0.9% saline or balanced crystalloid, 500–1000 mL bolus, reassess Euvolemic Maintenance only, treat the cause, avoid fluid overload Hypervolemic Fluid restriction, sodium restriction, diuretics if appropriate, dialysis if indicated Key principle: Treat the patient's volume status, not just the creatinine or urea level. A patient with markedly elevated RFTs may still require fluids if hypovolemic, whereas a patient with only moderately abnormal RFTs may need fluid restriction if overloaded.