Utilization of Vein Grafts in Coronary Artery Bypass Grafting: Reasons and Outcomes in a Bilateral Mammary Artery First Center

Table 1

Baseline data of unmatched and propensity score-matched patients.

	Before propensity score matching			After propensity score matching
	Group 1: BIMA (n = 2067)	Group 2: IMA + SVG (n = 1206)	value	Group 1: BIMA (n = 646)	Group 2: IMA + SVG (n = 646)	Standardized difference	value
Age, median (IQR)	65 (58–71)	76 (71–79)	<0.001	72 (67–75)	73 (66–77)	0.135	0.013
BMI > 30, n (%)	580 (28.1%)	319 (26.5%)	0.350	150 (23.3%)	192 (29.8%)	0.148	0.008
Male, n (%)	1782 (86.2%)	917 (76.0%)	<0.001	522 (80.8%)	526 (81.4%)	0.015	0.831
NSTEMI/STEMI, n (%)	587 (28.3%)	439 (36.4%)	<0.001	212 (32.8%)	196 (30.3%)	0.054	0.369
No. of diseased vessels, median (IQR)	3 (2–3)	3 (3–3)	<0.001	3 (3–3)	3 (3–3)	0.034	0.670
Extracardiac artheropathy^§, n (%)	350 (16.9%)	291 (24.2%)	<0.001	132 (20.4%)	140 (21.7%)	0.032	0.633
COPD^§, n (%)	104 (5.0%)	119 (9.9%)	<0.001	51 (7.9%)	48 (7.4%)	0.019	0.834
Stroke/TIA, n (%)	152 (7.4%)	136 (11.3%)	0.001	67 (10.4%)	70 (10.8%)	0.013	0.857
LVEF <35%, n (%)	83 (4.0%)	89 (7.4%)	<0.001	40 (6.2%)	37 (5.7%)	0.021	0.814
IDDM, n (%)	192 (9.3%)	141 (11.7%)	0.031	68 (10.5%)	64 (9.9%)	0.020	0.783
GFR<60 ml/min, n (%)	368 (17.8%)	460 (38.1%)	<0.001	191 (29.6%)	169 (26.2%)	0.076	0.192
EuroScore II, median (IQR)	1.2 (0.9–1.7)	2.1 (1.5–3.38)	<0.001	1.56 (1.22–2.14)	1.7 (1.30–2.47)	0.040	0.020
Urgent/emergency procedure, n (%)	243 (11.8%)	301 (25.0%)	<0.001	134 (20.7%)	112 (17.3%)	0.087	0.137

BIMA, bilateral internal mammary artery; IMA, internal mammary artery; SVG, saphenous vein graft; BMI, body mass index; NSTEMI, non-ST-elevation myocardial infarction; STEMI, ST-elevation myocardial infarction; COPD chronic obstructive pulmonary disease; TIA, transient ischemic attack; LVEF, left ventricular ejection fraction; IDDM, insulin-dependent diabetes mellitus; GFR, glomerular filtration rate; EuroSCORE II, European System for Cardiac Operative Risk Evaluation II; ^§extracardiac atheropathy; ^§COPD, according to EuroSCORE definitions. Variables included for propensity score matching: age, sex, NSTEMI/STEMI, number of diseased vessels, extracardiac artheropathy, COPD, TIA/stroke, LVEF <35%, IDDM, emergency procedure, GFR <60 ml/min.