title: Adenosine-induced ST segment depression with normal perfusion.
abstract: BACKGROUND
  Intravenous adenosine in conjunction with myocardial perfusion imaging is commonly used for the detection of coronary artery disease and risk assessment. We have previously shown that patients with ischemic changes on the 12-lead electrocardiogram (ECG) in response to adenosine but with normal perfusion pattern have a benign outcome on short intermediate follow-up. The long-term outcome of these patients is unknown.
  
  
  METHODS
  Patients with ischemic ECG response (> or = 1 mm ST depression) to adenosine infusion but with normal perfusion on single-photon emission computed tomography (SPECT) imaging in the absence of a history of myocardial infarction or coronary revascularization were followed up for mortality, myocardial infarctions, and coronary revascularization.
  
  
  RESULTS
  The cohort consisted of 73 patients (81% women) who were followed up for mortality for a mean of 61 +/- 15 months. There were 10 deaths, and the cause of death was determined to be non-cardiac in half of those. Follow-up for the other endpoints was complete for 21 +/- 10 months during which no patient had myocardial infarction and seven underwent coronary revascularization.
  
  
  CONCLUSIONS
  Patients with ischemic ECG response to intravenous adenosine administration and normal perfusion on SPECT are at low risk of cardiovascular events. The ST segment response to adenosine in this setting is likely related to non-ischemic mechanisms.
authors.affiliation: Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA. fadihage@uab.edu
authors.forename: Fadi G
authors.initials: FG
authors.lastname: Hage
authors.forename: Jaekyeong
authors.initials: J
authors.lastname: Heo
authors.forename: Ami E
authors.initials: AE
authors.lastname: Iskandrian
mesh_terms: D000241:Adenosine / Q000008:administration & dosage; D000368:Aged; D015331:Cohort Studies; D003324:Coronary Artery Disease / Q000150:complications / Q000175:diagnosis* / Q000401:mortality / Q000503:physiopathology / Q000628:therapy; D003326:Coronary Circulation; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000209:etiology* / Q000401:mortality / Q000503:physiopathology / Q000628:therapy; D055414:Myocardial Perfusion Imaging / Q000379:methods*; D009204:Myocardial Revascularization; D011237:Predictive Value of Tests; D011379:Prognosis; D018570:Risk Assessment; D013997:Time Factors; D015899:Tomography, Emission-Computed, Single-Photon; D014665:Vasodilator Agents / Q000008:administration & dosage
chemical_list: D014665:Vasodilator Agents; D000241:Adenosine