SummaryPeri-operative acute kidney injury is common, accounting for 30-40% of all in-hospital cases of acute kidney injury. It is associated with clinically significant morbidity and mortality even with what was hitherto regarded as relatively trivial increases in serum creatinine, and carries over a 12-fold relative risk of death following major abdominal surgery. Comorbid conditions such as diabetes, hypertension, liver disease and particularly pre-existing chronic kidney disease, as well as the type and urgency of surgery, are major risk factors for the development of postoperative acute kidney injury. As yet, there are no specific treatment options for the injured kidney, although there are several modifiable risk factors of which the anaesthetist should be aware. As well as the avoidance of potential nephrotoxins and appropriate volume balance, optimal anaesthetic management should aim to reduce the risk of postoperative renal complications. This may include careful ventilatory management and blood pressure control, as well as appropriate analgesic strategies. The choice of anaesthetic agent may also influence renal outcomes. Rather than concentrate on the classical management of acute kidney injury, this review focuses on the potential development of acute kidney injury peri-operatively, and the means by which this may be ameliorated.

Management of the profoundly anaemic patient who competently refuses blood transfusion will always prove challenging. This article provides a review of treatment strategies based around a recent case of a patient presenting after major gastrointestinal haemorrhage. The main part of management involves providing supportive intensive care, paying particular attention to oxygen delivery and consumption, and minimising further blood loss. Specific treatments, such as pharmacotherapy to promote erythropoiesis, are based largely on indirect evidence or expert opinion. Virtually all aspects of care involve carefully balancing a shifting profile of risks and benefits; a team approach and close communication with the family are essential. This patient's successful outcome has extended our understanding of this area, which is discussed.

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