title: Incidental renal artery stenosis among a prospective cohort of hypertensive patients undergoing coronary angiography.
abstract: OBJECTIVE
  To determine the feasibility, safety, and clinical yield of angiographic screening among hypertensive patients undergoing coronary angiography.
  
  
  METHODS
  This study was a prospective cohort analysis of hypertensive patients who underwent cardiac catheterization at a tertiary care referral center from July 1998 to March 1999. Abdominal aortography was performed to screen for renal artery stenosis, the percentage of which was measured.
  
  
  RESULTS
  The mean +/- SD age of the 297 study patients was 64.9+/-10.2 years; 58.6% were male, and 98.0% were white. Mean +/- SD systolic/diastolic blood pressure was 142.8+/-22.5/79.6+/-11.4 mm Hg. Aortography required a mean incremental dose of 62+/-9 mL of nonionic contrast agent. No complications were attributable to aortography. Of 680 renal arteries, 611 (90%) were visualized adequately. Also, 53% of patients had normal renal arteries, 28% had stenoses less than 50%, and 19.2% had stenoses of 50% or more. Renal artery stenosis was bilateral in 3.7% of patients and high grade (>70% stenosis) in 7%. Patients with renal artery stenosis were more likely to have had a previous coronary intervention. In multivariate analysis, systolic blood pressure (odds ratio [OR], 1.2; 95% confidence interval [CI], 1.03-138; P=.02), history of stroke or transient ischemic attack (OR, 2.7; 95% CI, 1.27-5.78; P=.01), and cancer (OR, 2.0; 95% CI, 1.02-3.82; P=.04) independently correlated with renal artery stenosis of 50% or more.
  
  
  CONCLUSIONS
  The prevalence of incidental renal artery stenosis among hypertensive patients undergoing coronary catheterization is significant. Therefore, screening abdominal aortography should be considered in these patients to better define their risk of cardiovascular complications.
authors.affiliation: Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Rochester, Minn 55905, USA.
authors.forename: Charanjit S
authors.initials: CS
authors.lastname: Rihal
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Textor
authors.forename: Jerome F
authors.initials: JF
authors.lastname: Breen
authors.forename: Michael A
authors.initials: MA
authors.lastname: McKusick
authors.forename: Diane E
authors.initials: DE
authors.lastname: Grill
authors.forename: John W
authors.initials: JW
authors.lastname: Hallett
authors.forename: David R
authors.initials: DR
authors.lastname: Holmes
mesh_terms: D001027:Aortography; D017023:Coronary Angiography; D003327:Coronary Disease / Q000150:complications*; D005240:Feasibility Studies; D005260:Female; D006439:Hemodynamics; D006801:Humans; D006973:Hypertension / Q000150:complications*; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011446:Prospective Studies; D012078:Renal Artery Obstruction / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology