Bilateral vs unilateral internal mammary revascularization in patients with left ventricular dysfunction

Table 2 Procedural characteristics of the study groups

Characteristics [n (%)]	BIMA group (n = 167)	LIMA-SVG group (n = 263)	P
On-pump surgery	164 (98.8)	245 (93.1)	0.80
Mean number of grafts per patient	2.5 ± 0.6	2.5 ± 0.7	0.91
Complete coronary revascularization	117 (70.1)	175 (66.5)	0.50
Extracorporeal circulation time (min) Median (IQR)	79.5 (65.2-100)	80.0 (64-100)	0.86
Length of stay in ICU (d) Median (IQR)	3.1 (2-4)	3.2 (2-5)	0.11
Length of stay in hospital (d) Median (IQR)	8.2 (7-11)	9.3 (6-12)	0.12
Ventilation time < 24 h	160 (95.8)	210 (79.9)	< 0.01
IABP	12 (7.2)	24 (9.1)	0.80
Vasopressors or inotropic drugs (> 24 h)	45 (27.3)	107 (41.1)	< 0.01
Transfusion (red blood cell units ≥ 3)	53 (31.7)	123 (46.7)	< 0.01

BIMA: Bilateral internal mammary artery; LIMA: Left internal mammary artery; SVG: Saphenous vein graft; ICU: Intensive care unit; IABP: Intra-aortic balloon counterpulsation.