123 Cardiac surgery in Influenza-Like-Illness season 6 Characteristics Baseline Season (n= 13,440) ILI Season (n= 12,994) P Value Age, years 68 (61-74) 68 (60-74) .33 Male 9883 (73.5) 9538 (73.4) .83 Body mass index, kg/m2 26.9 (24.3-29.8) 26.8 (24.4-29.8) .58 Chronic kidney disease 546 (4.1) 540 (4.2) .73 Malignant neoplasm 40 (0.3) 42 (0.3) .79 Cirrhosis 40 (0.3) 40 (0.3) .97 Diabetes mellitus type I or II 2655 (19.8) 2623 (20.2) .39 NYHA class IV 1015 (7.6) 1068 (8.2) .05 ACEF II risk score 1.93 (1.36-2.58) 1.98 (1.40-2.65) .005 APACHE IV predicted mortality 1.21 (0.40-3.06) 1.27 (0.42-3.28) .003 Academic hospital 5092 (37.9) 5248 (40.4) <.0001 Intensive care unit occupancy rate 0.98 (0.88-1.10) 1.12 (1.03-1.22) <.0001 Table 1. Clinical characteristics of patients who underwent surgery in baseline season compared with Influenza-like Illness season. Values are median (interquartile range) or n (%). ACEF II, Age, Creatinine, and Ejection Fraction II; APACHE IV, Acute Physiology and Chronic Health Evaluation IV; ILI, influenza-like illness; NYHA, New York Heart Association. There were no significant differences between the types of surgery that were performed during baseline season compared with ILI season (P = .81; Supplemental Table 2). In the unadjusted analysis, the P/F ratio was lower in the ILI season 1 day after admission (Table 2). Whereas there was no difference in the ICU length of stay, there was a difference in hospital length of stay, with patients who underwent surgery in the ILI season staying longer. Finally, there was a significant difference in in-hospital mortality between groups, with a higher in-hospital mortality in the ILI season group. Results including the intermediate group can be found in Supplemental Table 3.
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