Table 4.

Factors considered to have predisposed or directly contributed to acute renal failure requiring haemofiltration. Patients are grouped according to whether they have normal (≤124 µmol/l) (Group 1) or elevated (≥125 µmol/l) (Group 2) pre-operative serum creatinine

	Patient	Diabetes	IHD/HT	Peri-operative event	NSAIDs	Late sepsis/multi-organ failure
Group 1	1					✓
	2			Hypotension
	3			Hypotension
	4		✓
	5			Hypotension
	6
	7	✓	✓	Air Embolus
	8		✓			✓
	9	✓	✓	MI
Group 2	1	✓				✓
	2				✓
	3		✓
	4	✓
	5		✓			✓

HT, hypertension; IHD, ischaemic heart disease; MI, myocardial infarction; ✓, predisposing factor present.