Risk of contrast induced nephropathy in the critically ill: a prospective, case matched study

Table 4 Pre-scan renal function parameters.

	Pairs	Contrast	Non-Contrast	Difference	Paired P
mCl_Cr, mL/minute
Scan day, normalized to BSA^a	53	66 ± 30	65 ± 29	1 ± 5	0.2934
Scan day	53	78 ± 39	75 ± 34	3 ± 16	0.1768
Day before scan	24	78 ± 27	75 ± 28	4 ± 21	0.4102
Scan day calculated Cl_Cr, mL/min
Cockcroft-Gault formula	53	86 ± 33	90 ± 46	-5 ± 48	0.8456
MDRD formula	53	75 ± 28	76 ± 34	-1 ± 31	0.8828
S_Cr, μmol/L
Last value before scanning	53	92 ± 30	95 ± 41	-4 ± 37	0.4860
Lowest in the preceding week	53	82 ± 28	85 ± 40	-3 ± 37	0.6899
Highest in the preceding week	53	137 ± 80	134 ± 65	3 ± 97	0.9753
S_Cr variability in pre-scan week, %	53	67 ± 85	63 ± 62	4 ± 106	0.9049
Last pre-scan BUN, mmol/L	53	7.1 ± 3.6	8.2 ± 4.6	-1.1 ± 5.4	0.2053
Urine vol in 3 hrs before scan, mL	53	311 ± 365	237 ± 168	74 ± 401	0.3503

^aMatching criterion. BSA, body surface area; BUN, blood urea nitrogen; mCl_Cr, measured creatinine clearance; MDRD, modification of diet in renal disease; S_Cr, serum creatinine.

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