title: 64-slice MDCT angiography of upper extremity in assessment of native hemodialysis access.
abstract: OBJECTIVE
  To compare multidetector row computed tomographic (MDCT) angiography with conventional digital subtraction angiography (DSA) in the evaluation of vascular access stenoses in hemodialysis patients.
  
  
  METHODS
  Twenty-one consecutive patients were imaged with MDCT angiography and subsequent DSA. The superficial vein of leg was used as the route for intravenous administration. The vascular stenosis was assessed in not significant (<50% stenosis), moderate stenosis (50%-74% stenosis), severe stenosis (75%-99%), and total occlusion (100%). The accuracy, sensitivity, specificity, positive, and negative predictive values were calculated for significant vascular stenosis using DSA as the standard reference.
  
  
  RESULTS
  The sensitivity and specificity of MDCT angiography for the detection of significant hemodialysis vascular access were 100% (95% CI, 89.3%-100%) and 94.8% (95% CI, 89.1%-97.6%), respectively. The positive and negative predictive values were 84.2% (95% CI, 68.1%-93.4%) and 100% (95% CI, 95.8%-100%), respectively. The accuracy of MDCT angiography for detection of significant stenoses was 95.9% (95% CI, 91.4%-97.0%).
  
  
  CONCLUSIONS
  MDCT angiography provides excellent correlation in vascular stenosis as compared with DSA in hemodialysis access. Complete assessment of entire vascular segments could be performing with MDCT angiography in planning before endovascular intervention or surgical correction.
authors.affiliation: Department of Radiology, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Jitladda
authors.initials: J
authors.lastname: Wasinrat
authors.forename: Thanongchai
authors.initials: T
authors.lastname: Siriapisith
authors.forename: Somrach
authors.initials: S
authors.lastname: Thamtorawat
authors.forename: Trongtum
authors.initials: T
authors.lastname: Tongdee
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D001166:Arteriovenous Shunt, Surgical / Q000009:adverse effects; D003251:Constriction, Pathologic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011237:Predictive Value of Tests; D006435:Renal Dialysis; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013785:Thailand; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D034941:Upper Extremity / Q000098:blood supply*; D020246:Venous Thrombosis / Q000000981:diagnostic imaging* / Q000209:etiology