Table 3.

Univariate Analysis of Factors Associated with Survival at Four Weeks

Variables	HR (CI 95%)	P
Preoperative dialysis	1.33 (0.4–3.9)	0.598
Preoperative ICU hospitalization	2 (1.5–2.6)	<0.001
Preoperative endotracheal intubation	1.05 (0.3–3.5)	0.930
Preoperative tracheostomy	1.06 (0.5–2.07)	0.848
Hemoglobin	0.9 (0.8–0.9)	<0.001
BUN	1.005 (1.002–1.008)	<0.001
Albumin	1.09 (0.5–2.3)	0.801
Potassium	0.99 (0.6–1.6)	0.996
CRP	1.00 (0.99–1.00)	0.692
Postoperative dialysis	3.11 (1.9–4.9)	<0.001
Postoperative ICU hospitalization	1.6 (1.3–2.1)	<0.001
Postoperative tracheostomy	1.7 (1.3–2.2)	<0.001

HR, hazard Ratio; BUN, blood urea nitrogen; CRP, C reactive protein; ICU, intensive care unit.