Summary
Acute kidney injury (AKI) is a sudden decline in kidney function that affects the body’s ability to filter waste and balance fluids and electrolytes. It is often caused by:
- Infections (sepsis), dehydration, or low blood pressure (pre-renal AKI)
- Medications toxic to the kidneys, such as some antibiotics (e.g., gentamicin) or pain relievers (NSAIDs) (intrinsic AKI)
- Blockages in the urinary tract that prevent urine from leaving the body (post-renal AKI)
AKI is often detected during routine blood tests rather than through specific kidney-related symptoms. However, children may show signs such as low urine output, swelling, tiredness, confusion, or difficulty breathing.
Diagnosis and When to Seek Help
AKI is diagnosed based on:
- A sudden increase in blood creatinine levels (a marker of kidney function)
- A significant drop in urine output
- Symptoms of fluid overload, such as swelling (edema) or difficulty breathing
Seek medical attention if your child has:
- Severe vomiting or diarrhea leading to dehydration
- A prolonged illness with fever and low urine output
- Swelling in the legs, face, or abdomen
- Difficulty breathing or confusion
Management
- Treat the underlying cause: Address infections, dehydration, or medication side effects.
- Correct fluid and electrolyte imbalances: Some children need IV fluids or medications to restore balance.
- Avoid harmful medications: If AKI is caused by a drug, it may need to be discontinued.
- Relieve urinary blockages: If a blockage is present, a catheter or surgery may be needed.
- Dialysis: In severe cases where kidney function does not improve, temporary dialysis may be required to remove toxins from the blood.
Follow-Up and Monitoring
- Regular kidney function tests: To monitor recovery and prevent long-term damage.
- Long-term kidney health checks: Children who have had AKI are at higher risk of developing chronic kidney disease (CKD) later in life.
- Preventive care: Encourage good hydration and avoid medications that may harm the kidneys.
Early detection and proper management are crucial to prevent complications and support full kidney recovery.
History and Exam
Key diagnostic factor
- hypotension
- risk factors
- kidney insults
- reduced urine production
Other diagnostic factors
- dizziness and orthostatic symptoms
- hypertension
- altered mental status
- pericardial/pleural rub
Risk factors
- advanced age
- underlying kidney disease
- diabetes mellitus
- sepsis
Diagnostic Investigations
1st investigations to order
- basic metabolic profile (including urea and creatinine and liver function tests)
- serum potassium
- FBC
- bicarbonate
Investigations to consider
- renal tract ultrasound
- abdominal CT or MRI scan
- nuclear renal flow scan
- urine osmolality
Emerging tests
- novel serum and urinary biomarkers

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