title: ST-segment elevation in right precordial leads implies depressed right ventricular function after acute inferior myocardial infarction.
abstract: BACKGROUND
  The prognosis of acute inferior myocardial infarction is worse when it is complicated by right ventricular infarction. ST elevation in the right precordial leads is one of the reliable methods for detecting acute right ventricular infarction. The purpose of the study was to examine the relation between ST elevation in the right precordial electrocardiographic leads during acute inferior infarction and the severity of right ventricular systolic dysfunction.
  
  
  METHODS
  This study analyzed the relation between ST elevation > or = 0.1 mV in V4R and the severity of right ventricular systolic dysfunction in 43 consecutive patients (men/women: 35/8; average age 62+/-9 years) with acute inferior myocardial infarction with a rapid-response Swan-Ganz catheter to measure the right ventricular ejection fraction (RVEF).
  
  
  RESULTS
  RVEF was significantly lower in patients with ST elevation (n = 18) than in those without (n = 25) (33%+/-6% vs 40%+/-9%, p = 0.010). If the infarct-related lesion was located in the proximal right coronary artery, RVEF tended to be lower than if the lesion was located in the distal right coronary artery or the left circumflex coronary artery (33%+/-10% vs 37%+/-9% vs 42%+/-9%, p = 0.101). Logistic regression analysis demonstrated that ST elevation in V4R was the only independent predictor of depressed RVEF (odds ratio = 5.31, 95% confidence interval = 1.28 to 22.1, p = 0.022).
  
  
  CONCLUSIONS
  ST elevation in lead V4R during acute inferior myocardial infarction predicts right ventricular systolic dysfunction.
authors.affiliation: Second Department of Internal Medicine, Kyorin University School of Medicine, Mitaka, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yoshino
authors.forename: H
authors.initials: H
authors.lastname: Udagawa
authors.forename: H
authors.initials: H
authors.lastname: Shimizu
authors.forename: E
authors.initials: E
authors.lastname: Kachi
authors.forename: T
authors.initials: T
authors.lastname: Kajiwara
authors.forename: K
authors.initials: K
authors.lastname: Yano
authors.forename: M
authors.initials: M
authors.lastname: Taniuchi
authors.forename: K
authors.initials: K
authors.lastname: Ishikawa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006328:Cardiac Catheterization; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D006801:Humans; D007423:Intra-Aortic Balloon Pumping; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D009204:Myocardial Revascularization; D015203:Reproducibility of Results; D013318:Stroke Volume; D018497:Ventricular Dysfunction, Right / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy