title: Focal residual contrast media in the kidney 24 hours after angiography.
abstract: OBJECTIVE
  To examine the relationship between focal renal cortical retention (FRCR) and contrast-associated nephropathy (CAN).
  
  
  METHODS
  We investigated the incidence of both phenomena in 105 patients. CAN was defined as an increase in the creatinine level > 0.3 mg/dl and > 20% on days 1, 3, or 7. We compared predisposing factors for FRCR and CAN. Serum creatinine and blood urea nitrogen (BUN) for renal function were determined on the morning of the day of the angiography. The BUN/creatinine ratio was used as an indicator of the degree of hydration.
  
  
  RESULTS
  FRCR was demonstrated in 17 patients (16%) by delayed CT 24 h after angiography, and CAN was found in 16 patients (15%). No significant relationship between CAN and FRCR was found. We found a correlation between high total volumes of contrast and FRCR. Advanced age, high blood urea nitrogen, high creatinine, and dehydration were risk factors for CAN.
  
  
  CONCLUSIONS
  Delayed CT showed a higher incidence of injury to the renal parenchyma than previously detected by conventional radiography.
authors.affiliation: Department of Radiation Oncology, Osaka University Medical School, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamazaki
authors.forename: H
authors.initials: H
authors.lastname: Oi
authors.forename: M
authors.initials: M
authors.lastname: Matsushita
authors.forename: M
authors.initials: M
authors.lastname: Koizumi
authors.forename: K
authors.initials: K
authors.lastname: Kagawa
authors.forename: E
authors.initials: E
authors.lastname: Tanaka
authors.forename: S
authors.initials: S
authors.lastname: Murayama
authors.forename: T
authors.initials: T
authors.lastname: Nose
authors.forename: T
authors.initials: T
authors.lastname: Teshima
authors.forename: T A
authors.initials: TA
authors.lastname: Inoue
authors.forename: T O
authors.initials: TO
authors.lastname: Inoue
mesh_terms: D000792:Angiography; D015984:Causality; D003287:Contrast Media / Q000009:adverse effects*; D005260:Female; D006801:Humans; D015994:Incidence; D007672:Kidney Cortex / Q000000981:diagnostic imaging*; D007674:Kidney Diseases / Q000139:chemically induced* / Q000000981:diagnostic imaging / Q000453:epidemiology; D007677:Kidney Function Tests; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D013997:Time Factors; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media