Intravascular Ultrasound (IVUS) findings according to the presence or absence of events after PEB angioplasty (n = 58).

Table 2: Intravascular Ultrasound (IVUS) findings according to the presence or absence of events after PEB angioplasty (n = 58).

Variables	non-PEB failure (n = 50)	PEB failure (n = 8)	P-value
Variables	mean ± SD or n (%)		P-value
Proximal reference segment
EEM CSA, mm²	13.8 ± 4.10	14.4 ± 3.40	0.58
Lumen CSA, mm²	6.3 ± 1.9	6.4 ± 1.3	0.21
P&M CSA, mm²	7.5 ± 3.1	8.1 ± 3.2	0.97
Plaque burden, %	53.2 ± 9.80	55.0 ± 9.30	0.67
Proximal segment of stent
EEM CSA, mm²	13.3 ± 4.30	15.4 ± 3.40	0.56
Stent area, mm²	6.4 ± 2.1	8.6 ± 1.9	0.65
Lumen CSA, mm²	5.0 ± 1.6	5.9 ± 2.4	0.40
Neointimal CSA, mm²	1.2 ± 1.6	2.7 ± 1.9	0.66
Minimum lumen site
EEM CSA, mm²	13.1 ± 4.40	12.9 ± 4.70	0.60
Stent area, mm²	5.9 ± 2.6	7.0 ± 0.6	0.11
Lumen CSA, mm²	2.2 ± 0.6	2.4 ± 0.8	0.18
Neointimal CSA, mm²	3.6 ± 2.3	4.6 ± 1.2	0.30
Neointimal hyperplasia, %	55.7 ± 19.4	65.4 ± 14.5	0.48
Minimum stent site
EEM CSA, mm²	13.2 ± 3.90	14.3 ± 4.20	0.91
Stent area, mm²	5.5 ± 2.7	6.7 ± 0.3	0.06
Lumen CSA, mm²	2.5 ± 0.8	2.8 ± 0.9	0.52
Neointimal CSA, mm²	2.9 ± 0.8	4.0 ± 0.7	0.05
Neointimal hyperplasia, %	46.0 ± 24.9	59.4 ± 12.0	0.04
Stent under-expansion	24 (48)	0 (0)	0.02
Distal segment of stent
EEM CSA, mm²	12.3 ± 4.40	12.9 ± 3.90	0.93
Stent area, mm²	6.4 ± 2.4	7.0 ± 1.2	0.30
Lumen CSA, mm²	5.2 ± 1.9	6.2 ± 1.3	0.55
Neointimal CSA, mm²	1.2 ± 1.6	0.8 ± 0.4	0.31
Distal reference segment
EEM CSA, mm²	11.8 ± 5.4	11.7 ± 5.4	0.75
Lumen CSA, mm²	6.0 ± 2.2	6.0 ± 1.0	0.14
P&M CSA, mm²	5.8 ± 3.5	5.6 ± 4.4	0.30
Plaque burden, %	47.8 ± 8.30	41.7 ± 18.9	0.05
Lesion length	12.8 ± 7.10	19.0 ± 3.20	0.34

^*χ²-test for no event group vs. event group; p-value was calculated by χ² - test for continuous (p-value < 0.05). CSA: Cross-sectional area, EEM: External elastic membrane, P & M: Plaque and media.