title: A Comparison of Intravascular Imaging Modalities for Detection of Stent Struts in Acute Coronary Syndrome.
abstract: BACKGROUND
  We used optical coherence tomography (OCT) and intravascular ultrasound (IVUS) to assess the struts of implanted stents in patients with acute coronary syndrome (ACS).
  
  
  METHODS
  A totle of 10,756 stent struts were analyzed with OCT in 42 patients of ACS. Of them, both of IVUS and OCT imaging were performed in 33 patients. Appearance of stent struts was classified as well apposed, buried, malapposed, and nondetectable, and the number of stent struts were counted by OCT and IVUS was compared.
  
  
  RESULTS
  Most of stent struts were well apposed (78.1%, 8,407/10,756). However, malapposed struts were 5.6% (607/10,756), and 14.1% (1,514/10,756) of stent struts were buried by thrombus. The nondetectable struts were 2.11% (228/10,756) in ACS. 94.7% (216/228) of nondetectable stent struts were associated with red thrombus, and plaque prolapse was in 5.3% (12/228). The number of stent struts counted by OCT were larger than that of IVUS. The mean number of stent struts at the proximal and distal stent edges were 24 ± 6.57 in OCT, the stent struts IVUS counted were 20 ± 4.18 (P < 0.0001). Although the frequency of malapposed struts were similar 4.6% (376/8,248) in OCT versus 4.8% (369/7,674) in IVUS (P = 0.788). Stent struts were often buried by thrombus in ACS 15.2% (1,252/8,248) in OCT versus 9.7% (747/7,674) in IVUS; P = 0.006. The nondetectable struts were fewer in IVUS than OCT 0.2% (16/7,674) in IVUS versus 2.2% (187/8,248) in OCT; P < 0.0001.
  
  
  CONCLUSIONS
  Stent struts are frequently buried and nondetectable due to thrombi burden in ACS patients. Adequate thrombus removal and proper selection of the imaging device is warranted in ACS.
authors: Cardiovascular-Arrhythmia Center, Chung-Ang University Hospital, Seoul, Korea.
authors: Seong Hyeop
authors: SH
authors: Hyeon
authors: Cardiovascular-Arrhythmia Center, Chung-Ang University Hospital, Seoul, Korea.
authors: Wang Soo
authors: WS
authors: Lee
authors: Cardiovascular Center, Inje University Paik Hospital, Busan & Goyang, Korea.
authors: Doo Il
authors: DI
authors: Kim
authors: Cardiovascular Center, Ulsan University Hospital, Ulsan, Korea.
authors: Eun Seok
authors: ES
authors: Shin
authors: Cardiovascular Center, Jeju National University Hospital, Jeju, Korea.
authors: Ki Seok
authors: KS
authors: Kim
authors: Heart Center, Chonnam National University Hospital, Gwangju, Korea.
authors: Young Joon
authors: YJ
authors: Hong
authors: Cardiovascular Center, Inje University Paik Hospital, Busan & Goyang, Korea.
authors: Sung Yun
authors: SY
authors: Lee
authors: Cardiovascular-Arrhythmia Center, Chung-Ang University Hospital, Seoul, Korea.
authors: Hoyoun
authors: H
authors: Won
authors: Cardiovascular-Arrhythmia Center, Chung-Ang University Hospital, Seoul, Korea.
authors: Tae Ho
authors: TH
authors: Kim
authors: Cardiovascular-Arrhythmia Center, Chung-Ang University Hospital, Seoul, Korea.
authors: Sang-Wook
authors: SW
authors: Kim
mesh_terms: D054058:Acute Coronary Syndrome / Q000601:surgery*; D000368:Aged; D057186:Comparative Effectiveness Research; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D062645:Percutaneous Coronary Intervention / Q000009:adverse effects* / Q000295:instrumentation / Q000379:methods; D011183:Postoperative Complications / Q000175:diagnosis*; D015203:Reproducibility of Results; D015607:Stents / Q000009:adverse effects*; D041623:Tomography, Optical Coherence / Q000379:methods*; D018084:Ultrasonography, Interventional / Q000379:methods*