title: CT imaging before transcatheter aortic valve implantation (TAVI) using variable helical pitch scanning and its diagnostic performance for coronary artery disease.
abstract: OBJECTIVE
  To evaluate the effectiveness of CT before TAVI using variable helical pitch (VHP) scanning and its diagnostic performance for coronary artery disease (CAD).
  
  
  METHODS
  Sixty patients (84.4 ± 4.6 years) scheduled for TAVI underwent CT using VHP scanning with the contrast material (CM) volume calculated as scanning time × weight [kg] × 0.06 mL. Retrospective electrocardiography (ECG)-gated scanning was utilized to examine the thorax, and non-ECG-gated scanning of the abdomen immediately followed. We analyzed CT attenuation values of the coronary arteries, aorta, iliac and femoral arteries. The coronary CT angiography images were evaluated for the presence of stenosis (≥50 %); invasive coronary angiography served as a reference standard.
  
  
  RESULTS
  The average attenuations of all of the arteries were greater than 400 HU. We could evaluate the peripheral access vessels and dimensions of the ascending aorta, aortic root, and aortic annulus in all patients. The average volume of CM was 38.7 ± 8.5 mL. On per-patient and vessel analysis, CT showed 91.7 % and 89.5 % sensitivity, and 91.3 % and 97.4 % negative predictive value (NPV).
  
  
  CONCLUSIONS
  CT using VHP scanning with an average CM volume of 38.7 mL is useful before TAVI and had a high sensitivity and NPV in excluding obstructive CAD.
  
  
  CONCLUSIONS
  • TAVI-planning CT using variable helical pitch (VHP) scanning is useful. • The average volume of contrast material was 38.7 ± 8.5 mL. • The average attenuations of all the arteries were >400 HU. • This CT had a high sensitivity and NPV for excluding obstructive CAD.
authors: Department of Diagnostic Radiology, Keio University School of Medicine, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
authors: Shunsuke
authors: S
authors: Matsumoto
authors: Department of Diagnostic Radiology, Keio University School of Medicine, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan. yamada@rad.med.keio.ac.jp.
authors: Yoshitake
authors: Y
authors: Yamada
authors: Department of Diagnostic Radiology, Keio University School of Medicine, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
authors: Masahiro
authors: M
authors: Hashimoto
authors: Department of Diagnostic Radiology, Keio University School of Medicine, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
authors: Teppei
authors: T
authors: Okamura
authors: Research Park, Keio University School of Medicine, Tokyo, Japan.
authors: Minoru
authors: M
authors: Yamada
authors: Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
authors: Fumiaki
authors: F
authors: Yashima
authors: Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
authors: Kentaro
authors: K
authors: Hayashida
authors: Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
authors: Keiichi
authors: K
authors: Fukuda
authors: Department of Diagnostic Radiology, Keio University School of Medicine, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan. jinzaki@rad.med.keio.ac.jp.
authors: Masahiro
authors: M
authors: Jinzaki
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001011:Aorta / Q000000981:diagnostic imaging; D001021:Aortic Valve / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000601:surgery*; D000072226:Computed Tomography Angiography; D003287:Contrast Media; D017023:Coronary Angiography / Q000379:methods; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging*; D023921:Coronary Stenosis / Q000000981:diagnostic imaging*; D004562:Electrocardiography; D005260:Female; D005263:Femoral Artery / Q000000981:diagnostic imaging; D006801:Humans; D007083:Iliac Artery / Q000000981:diagnostic imaging; D008297:Male; D011300:Preoperative Care; D012189:Retrospective Studies; D036542:Tomography, Spiral Computed / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods; D065467:Transcatheter Aortic Valve Replacement / Q000379:methods
chemical_list: D003287:Contrast Media
keywords: Contrast media; Coronary artery disease; Multidetector computed tomography; Sensitivity and specificity; Transcatheter aortic valve replacement