Incidence and outcomes of acute kidney injury after cardiac surgery using either criteria of the RIFLE classification

Table 4 Multivariate binary logistic regression of AKI development according to perioperative factors

	OR	95 % CI	p-value
Age (years)	1.02	1.00 - 1.04	0.11
Gender (Female vs Male)	0.91	0.52 - 1.59	0.73
BMI (kg/m²)	1.12	1.06 - 1.18	< 0.001
Hypertension (Yes vs No)	0.75	0.44 - 1.28	0.28
COPD (Yes vs No)	1.18	0.67 - 2.09	0.56
Angina pectoris (Yes vs No)	0.70	0.64 - 1.77	0.80
MI previous surgery (Yes vs No)	0.74	0.44 - 1.27	0.28
Diabetes mellitus (Yes vs No)	1.11	0.64 - 1.91	0.72
Emergency (Yes vs No)	0.39	0.09 - 1.72	0.21
Preoperative GFR (mL/min.)	0.98	0.97 - 0.99	0.004
Preoperative hemoglobin (g/dL)	0.02	0.87 - 1.19	0.84
LVEF <60 % (Yes vs No)	1.01	0.60 - 1.71	0.97
Surgical delay (days)	1.00	1.00 - 1.01	0.47
Type of surgery:
Valve (vs CABG)	1.56	0.70 - 3.51	0.28
Valve and CABG (vs CABG)	10.3	3.11 - 33.9	< 0.001
CPB time (min.)^*	1.01	1.00 - 1.02	0.17
Aortic cross clamp time (min.)^*	0.99	0.96 - 1.01	0.23
Nadir hematocrit (%)	1.01	0.94 - 1.08	0.79
Nadir MAP during surgery (mmHg)	0.99	0.96 - 1.01	0.36

OR: odds ratio ± 95 % confidence interval; BMI: body mass index; COPD: chronic obstructive pulmonary disease; MI: myocardial infarction; GFR: glomerular filtration rate; LVEF: left ventricular ejection fraction; Surgical delay: delay between diagnostic coronarography and surgery; CABG: coronary artery bypass graft with cardiopulmonary bypass; Valve surgery: aortic valve replacement or mitral valve repair/replacement surgery; Valve and CABG: aortic valve replacement or mitral valve repair/replacement surgery combined with coronary artery bypass graft; CPB: cardiopulmonary bypass; MAP: mean arterial pressure; *, n=385

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