Table 2. Angiographic characteristics.

Data are mean ± SD or n (%), patients = 41. FFR: fractional flow reserve; IVUS: intravascular ultrasound; LAD: left artery disease; LCx: left circumflex; LM: left main; MLA: minimal lumen area; UFR: ultrasound flow ratio.
Left man lesion location
Ostial LM lesion	12 (29.3%)
Mid-shaft LM lesion	11 (26.8%)
Distal bifurcation lesion	18 (43.9%)
Reference vessel diameter, mm	4.64 ± 0.61
Diameter stenosis, %	66.2 ± 16.6
Minimal lumen diameter, mm	2.23 ± 0.53
Lesion length, mm	10.4 ± 4.48
IVUS analysis
MLA	5.23 ± 2.16
MLA ≤ 4.5mm2	16 (39.0%)
MLA ≤ 6.0mm2	29 (70.7%)
Plaque burden, %	70.4 ± 10.1
UFR analysis
UFR	0.73 ± 0.10
UFR ≤ 0.80	32 (78.0%)
FFR analysis
FFR	0.70 ± 0.12
FFR ≤ 0.80	29 (70.7%)