Interpretable prognostic modeling for long-term survival of Type A aortic dissection patients using support vector machine algorithm

Table 1 Comparison of perioperative conditions: variables selected through LASSO cox regression for initial screening in the training set

Variables	No. of outcomes (%)	No. of survivors (%)	p value
Shock			0.007
No	32 (84.21%)	95 (95.96%)
Yes	6 (15.79%)	4 (4.04%)
Abdominal pain			0.043
No	31 (81.58%)	92 (92.93%)
Yes	7 (18.42%)	7 (7.07%)
Age	50.97 ± 8.32	48.52 ± 9.86	0.176
POHS (days)	12.29 ± 10.65	22.79 ± 14.79	< 0.001
ICUHS (days)	11.53 ± 10.56	12.54 ± 8.53	0.563
WBC (× 10⁹/L)	13.85 ± 5.15	11.45 ± 4.06	0.012
AST (IU/L)	111.66 ± 326.96	39.51 ± 68.72	0.187
Creatinine (μmol/L)	111.87 ± 52.3	85.8 ± 34.5	0.006
Fibrinogen (g/L)	3.16 ± 2.09	3.07 ± 1.67	0.801
BNP (pg/mL)	992.75 ± 1194.83	971.16 ± 1546.08	0.931
SII	3696.2 ± 6274.47	2339.37 ± 2290.6	0.065
Operation time (min)	624.29 ± 177.61	524.05 ± 113.71	0.002
Intraoperative bleeding (ml)	947.58 ± 1158.87	582.65 ± 471.87	0.067
Transfusion of SRBC (U)	4.13 ± 3.51	3.35 ± 2.96	0.226
Transfusion of Plasma (ml)	948.46 ± 424.49	749.3 ± 375.54	0.014
CPB time (min)	308.16 ± 86.55	264.76 ± 63.88	0.007
ACC time (min)	172.62 ± 31.57	158.92 ± 50.50	0.057

POHS postoperative hospital stay, ICUHS intensive care unit hospital stay, WBC white blood cell count, AST aspartate aminotransferase, BNP B-type natriuretic peptide, SII Systemic Immune-Inflammation Index, SRBC suspended red blood cells, CPB cardiopulmonary bypass, ACC aortic cross-clamp