Table 3. Significant risk factors associated with hospital mortality.

	Univariate analysis
Variables	Survival group n (%)	Mortality group n (%)	p-value
Total number	40 (100)	11 (100)
Pre-operative
Respiratory failure	2	6	< 0.001
Peri-operative
Cardiopulmonary bypass time > 200 mins	10	9	< 0.001
Post-operative
pH < 7.2	1	8	< 0.001
Troponin I > 2.0 ng/dl	4	8	< 0.001
Acute renal failure	11	11	< 0.001
	Acute renal failure
Variables	OR	95% CI	p-value
Pre-operative
Respiratory failure	12.84	1.48–111.0	0.020
Peri-operative
CPB time > 200 min	13.49	1.29–140.1	0.029
Post-operative
pH < 7.2	88.63	1.178–4.39	0.003
Troponin I > 2.0	20.08	1.37–293.4	0.013

AR, aortic regurgitation; CRP, C-reactive protein; CI, confidence interval; OR, odds ratio; CPB, cardiopulmonary bypass.