Table 2

Morphologic Characteristics Between Sections With Versus Without NIRS-LRP

FA (n = 366)Non-FA (n = 1,577)
LRP
(n = 173)
No LRP
(n = 193)
p ValueLRP
(n = 92)
No LRP
(n = 1,485)
p Value
Grayscale IVUS
 Lumen, mm25.1 (3.8–7.3)6.0 (4.3–7.6)0.476.2 (4.4–8.4)6.0 (4.4–8.1)0.23
 EEM, mm214.3 (11.9–18.0)14.7 (11.5–18.5)0.114.8 (9.8–18.3)11.5 (8.5–15.4)<0.001
 P+M, mm29.1 (7.1–11.7)8.4 (6.2–1.1)<0.0017.8 (4.9–11.2)5.1 (3.2–8.1)<0.001
 Plaque burden, %63.3 (54.3–71.0)58.0 (51.5–65.5)<0.00155.1 (49.9–61.4)46.3 (35.4–56.2)<0.001
 Attenuation76 (44%)56 (29%)0.00315 (16%)52 (3.5%)<0.001
 Arc of calcium, °35.8 (0–107.9)40.7 (0–117.9)0.7517.2 (0–130.0)0 (0–20.3)0.001
 Calcium128 (66%)104 (60%)0.4448 (52.2%)397 (26.7%)<0.001
Plaque type
 AIT6 (6.5%)632 (42.5%)
 SMC rich5 (5.4%)106 (7.1%)
 Bland fibrous3 (3.3%)98 (6.6%)
 Intimal xanthoma2 (2.2%)26 (1.7%)<0.001
 Fibrocalcific30 (32.6%)349 (23.5%)
 Calcified nodule0 (0%)15 (1.0%)
 PIT46 (50.0%)259 (17.4%)
 Early FA63 (36.4%)60 (31.1%)
 Early FA, calcified22 (12.7%)40 (20.7%)
 Late FA47 (27.2%)36 (18.7%)0.068
 Late FA, calcified34 (19.7%)50 (25.9%)
 Thin-cap FA7 (4.0%)7 (3.6%)

Values are generalized estimating equation least-square mean (95% confidence interval) or n (%).

Nonparametric (Mann-Whitney) test.

Abbreviations as in Table 1.