title: Meta-analysis of intravenous dipyridamole-thallium-201 imaging (1985 to 1994) and dobutamine echocardiography (1991 to 1994) for risk stratification before vascular surgery.
abstract: OBJECTIVE
  This study evaluated the prognostic value of abnormal test results with pharmacologic stress with regard to perioperative and long-term outcomes in a large population of candidates for vascular surgery.
  
  
  BACKGROUND
  Although numerous studies have demonstrated the prognostic value of dipyridamole-thallium-201 myocardial perfusion and dobutamine echocardiography in vascular surgery candidates, a synopsis of predictive estimates is difficult because of individual study variability in pretest clinical risk, sample size and study design.
  
  
  METHODS
  A systematic review of published reports on preoperative pharmacologic stress risk stratification from the MEDLINE data base (1985 to 1994) identified 10 reports on dipyridamole-thallium-201 myocardial perfusion (1,994 patients) and 5 on dobutamine stress echocardiography (446 patients). Random effects models were used to calculate summary odds ratios and 95% confidence intervals.
  
  
  RESULTS
  Summary odds ratios for death or myocardial infarction and secondary cardiac end points were greater for dobutamine echocardiographic dyssynergy (14- to 27-fold) than for dipyridamole-thallium-201 redistribution (4-fold); wider confidence intervals were noted with dobutamine echocardiography. Pretest coronary disease probability was correlated with the positive predictive value of a reversible thallium-201 defect (r=0.70), increasing sixfold from low to high risk patient subsets. Cardiac event rates were low in patients without a history of coronary artery disease (1% in 176 patients) compared with patients with coronary disease and a normal or fixed-defect pattern (4.8% in 83 patients) and one or more thallium-201 redistribution abnormality (18.6% in 97 patients, p=0.0001).
  
  
  CONCLUSIONS
  Meta-analysis of 15 studies demonstrated that the prognostic value of noninvasive stress imaging abnormalities for perioperative ischemic events is comparable between available techniques but that the accuracy varies with coronary artery disease prevalence.
authors.affiliation: Department of Internal Medicine, Duke University Medical Center, Durham, North Carolina, USA.
authors.forename: L J
authors.initials: LJ
authors.lastname: Shaw
authors.forename: K A
authors.initials: KA
authors.lastname: Eagle
authors.forename: B J
authors.initials: BJ
authors.lastname: Gersh
authors.forename: D D
authors.initials: DD
authors.lastname: Miller
mesh_terms: D000318:Adrenergic beta-Agonists; D000368:Aged; D004176:Dipyridamole / Q000008:administration & dosage; D004280:Dobutamine; D004452:Echocardiography; D005080:Exercise Test; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006331:Heart Diseases / Q000150:complications / Q000000981:diagnostic imaging; D006801:Humans; D007262:Infusions, Intravenous; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D011300:Preoperative Care; D011379:Prognosis; D011877:Radionuclide Imaging; D018570:Risk Assessment; D013794:Thallium Radioisotopes; D014652:Vascular Diseases / Q000150:complications / Q000601:surgery*; D014665:Vasodilator Agents / Q000008:administration & dosage
chemical_list: D000318:Adrenergic beta-Agonists; D013794:Thallium Radioisotopes; D014665:Vasodilator Agents; D004280:Dobutamine; D004176:Dipyridamole