title: Systolic reconstruction in patients with low heart rate using coronary dual-source CT angiography.
abstract: OBJECTIVE
  The purpose of our study was to determine the relationship between the predictive factors and systolic reconstruction (SR) as an optimal reconstruction window in patients with low heart rate (LHR; less than 65 bpm).
  
  
  METHODS
  391 patients (262 male and 129 female, mean age; 67.1±10.1 years of age) underwent coronary CTA without the additional administration of a beta-blocker. Affecting factors for SR were analyzed in age, gender, body weight (BW), diabetes mellitus (DM), coronary arterial disease (CAD), ejection fraction (EF), systolic and diastolic body pressure (BP) and heart rate variability (HRV) during coronary CTA.
  
  
  RESULTS
  In 29 (7.4%) of the 391 patients, SR was needed, but there was no apparent characteristic difference between the systolic and diastolic reconstruction groups in terms of gender, age, BW, DM, CAD and EF. In a multivariate analysis, the co-existence of DM [P<0.05; OR, 0.27; 95% CI, 0.092-0.80], diastolic BP [P<0.01; OR, 0.95; 95% CI, 0.92-0.98] and HRV [P<0.01; OR, 0.98; 95% CI, 0.96-0.99] were found to be the factors for SR. In gender-related analysis, HRV was an important factor regardless of sex, but co-existence of DM affected especially for female and BP for male.
  
  
  CONCLUSIONS
  Especially in the patients with LHR who had a medication of DM, high HRV or high BP, SR, in addition to DR, was needed to obtain high-quality coronary CTA images.
authors.affiliation: Department of Radiology, Yamaguchi University Graduate School of Medicine, and Yamaguchi University Hospital, 1-1-1 Minamikogushi, Ube, Yamaguchi 755-8505, Japan. radokada@yamaguchi-u.ac.jp
authors.forename: Munemasa
authors.initials: M
authors.lastname: Okada
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Youko
authors.initials: Y
authors.lastname: Shigemoto
authors.forename: Naofumi
authors.initials: N
authors.lastname: Matsunaga
authors.forename: Toshiro
authors.initials: T
authors.lastname: Miura
authors.forename: Tomoko
authors.initials: T
authors.lastname: Nao
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Sano
authors.forename: Akiko
authors.initials: A
authors.lastname: Narazaki
authors.forename: Shoji
authors.initials: S
authors.lastname: Kido
mesh_terms: D000368:Aged; D000465:Algorithms; D001919:Bradycardia / Q000000981:diagnostic imaging* / Q000503:physiopathology; D017023:Coronary Angiography / Q000379:methods*; D003327:Coronary Disease / Q000503:physiopathology; D003920:Diabetes Mellitus / Q000503:physiopathology; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D008297:Male; D011237:Predictive Value of Tests; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D012307:Risk Factors; D013599:Systole; D014057:Tomography, X-Ray Computed / Q000379:methods*; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000503:physiopathology