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Comparison of preoperative LVEF and APACHE II score between the two groups. A: Comparison of LVEF between the two groups. B: Comparison of preoperative APACHE II scores between the two groups. Notes: LVEF: Left Ventricular Ejection Fraction; APACHE II: Acute Physiology and Chronic Health Evaluation II. *** indicates P<0.001; **** indicates P<0.0001.
