Table 3. Optical Coherence Tomographic Findings
Onset of VLSTP Value
All (n=98)Earlier (n=49)Delayed (n=49)
Full stent length
Analyzed frames26.0 (20.0–32.3)26.0 (20.5–33.0)26.0 (20.0–32.0)0.939
Analyzed struts172.5 (126.5–241.3)183.0 (142.0–246.0)163.0 (110.5–221.5)0.309
Stent CSA, mm27.5 (6.0–8.4)6.9 (5.5–8.2)7.8 (6.2–8.5)0.073
Lumen CSA, mm24.1 (3.0–5.3)4.4 (3.3–5.8)4.0 (2.7–4.9)0.124
Malapposed struts (%)1.2 (0–5.0)1.3 (0–5.2)1.2 (0–4.9)0.692
Uncovered struts (%)5.0 (0.9–5.2)5.0 (2.8–9.9)2.6 (0–5.1)0.033
Thrombosed regions
Analyzed frames4.0 (3.0–6.0)3.0 (2.3–5.8)4.0 (3.0–6.0)0.484
Analyzed struts17.0 (11.0–32.3)18.0 (11.0–34.8)17.0 (11.0–32.0)0.588
Stent CSA, mm27.6 (6.1–8.6)7.2 (6.0–8.4)7.8 (6.1–8.8)0.222
Lumen CSA, mm22.5 (1.4–5.4)2.1 (1.4–5.4)2.5 (1.5–5.4)0.736
Minimum stent CSA, mm27.1 (5.5–8.1)6.5 (5.1–7.7)7.4 (5.7–8.2)0.147
Stent underexpansion18 (18.4)11 (22.4)7 (14.3)0.297
Minimum lumen CSA, mm21.5 (0.9–3.8)1.4 (0.9–4.4)1.7 (0.8–3.6)0.949
Malapposed struts (%)25.0 (15.0–37.3)28.0 (14.5–37.3)20.1 (14.9–38.4)0.957
Maximal distance of malapposed struts, μma710.0 (465.0–1175.0)890.0 (555.0–1200.0)520.0 (410.0–1055.0)0.191
Uncovered struts (%)14.6 (0–35.0)33.3 (0–35.1)0 (0–35.4)0.057
Primary cause of VLST
Stent malapposition33 (33.7)17 (34.7)16 (32.7)0.831
Evagination3 (3.1)0 (0)3 (6.1)0.242
Uncovered struts without stent malapposition or evagination24 (24.5)17 (34.7)7 (14.3)0.019
Neoatherosclerosis34 (34.7)12 (24.5)22 (44.9)0.034
Neointimal erosion without neoatherosclerosis4 (4.1)3 (6.1)1 (2.0)0.617
  • Data are presented as number (percentage) or median (interquartile range). CSA indicates cross‐sectional area; VLST, very late stent thrombosis.

  • a Compared within patients having malapposed struts.