Acute Kidney Injury (AKI) is a medical emergency characterised by a sudden deterioration in renal function. The immediate priorities are to identify life-threatening complications such as hyperkalaemia, pulmonary oedema and severe metabolic acidosis, followed by determining whether the cause is pre-renal, intrinsic renal or post-renal. Early recognition and prompt management can prevent irreversible kidney damage and reduce mortality. The uploaded PACES scenario emphasises urgent assessment of hyperkalaemia, careful volume assessment, review of nephrotoxic medications and consideration of dehydration and drug-induced acute interstitial nephritis as key causes. :contentReference[oaicite:2]{index=2}
Acute Kidney Injury is diagnosed by an acute deterioration in renal function with or without oliguria. The first priority is recognising life-threatening complications such as hyperkalaemia, pulmonary oedema, severe metabolic acidosis and uraemic complications. The underlying cause should then be classified as pre-renal, intrinsic renal or post-renal to guide definitive management. In the uploaded PACES scenario, dehydration with ongoing diuretic therapy is the most likely cause, although antibiotic-associated acute interstitial nephritis should also be considered. :contentReference[oaicite:1]{index=1}
"Your blood tests show that your kidneys are not working as well as they were when you came into hospital. The good news is that many cases of acute kidney injury improve once the underlying cause is treated. Our immediate priority is to correct the high potassium level because this can affect the heart, while identifying why the kidneys have become impaired. We will monitor you closely, adjust your medications and involve the kidney specialists if necessary."
| Feature | Pre-renal AKI | Intrinsic AKI |
|---|---|---|
| Urinary sodium | <20 mmol/L | >40–50 mmol/L |
| Urine osmolality | >500 mOsm/kg | <350 mOsm/kg |
| Urine concentration | Preserved | Impaired |
| Typical cause | Hypovolaemia / Sepsis | ATN / AIN / GN |
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