title: Value of lead aVR in predicting acute occlusion of proximal left anterior descending coronary artery and in-hospital outcome in ST-elevation myocardial infarction: an electrocardiographic predictor of poor prognosis.
abstract: BACKGROUND
  We aimed to investigate the value of ST elevation in lead aVR (ST upward arrow aVR) in predicting the left anterior descending coronary artery (LAD) occlusion site proximal to first septal perforator (S(1)) and its effect on in-hospital outcome in ST-elevation myocardial infarction (STEMI).
  
  
  METHODS
  The study included 950 patients with STEMI. Patients were divided into 2 groups as aVR(+) and aVR(-) according to the presence of an ST upward arrow aVR of 0.5 mm or greater.
  
  
  RESULTS
  ST elevation in lead aVR was seen in 155 (16%) patients, and LAD occlusion proximal to S(1) was detected in 52% of patients in the aVR(+) group and in 9% of patients in the aVR(-) group. aVR positivity was associated with higher heart rate, lower systolic blood pressure and ejection fraction, and worse Killip class at the hospital admission. In-hospital mortality was 19% in the aVR(+) group and 5% in the aVR(-) group. aVR positivity was an independent predictor of in-hospital death.
  
  
  CONCLUSIONS
  This study revealed that ST upward arrow aVR was not only a good indicator of LAD occlusion proximal to S(1) but also a source of valuable information about in-hospital outcome in patients with STEMI.
authors.affiliation: Meram Faculty of Medicine, Cardiology Department, Selcuk University, Konya, Turkey. nazifaygul@yahoo.com
authors.forename: Nazif
authors.initials: N
authors.lastname: Aygul
authors.forename: Kurtulus
authors.initials: K
authors.lastname: Ozdemir
authors.forename: Mehmet
authors.initials: M
authors.lastname: Tokac
authors.forename: Meryem Ulku
authors.initials: MU
authors.lastname: Aygul
authors.forename: Mehmet Akif
authors.initials: MA
authors.lastname: Duzenli
authors.forename: Adnan
authors.initials: A
authors.lastname: Abaci
authors.forename: Ahmet
authors.initials: A
authors.lastname: Bacaksiz
authors.forename: Hüseyin
authors.initials: H
authors.lastname: Yazici
authors.forename: Sait
authors.initials: S
authors.lastname: Bodur
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000401:mortality*; D015897:Comorbidity; D023921:Coronary Stenosis / Q000175:diagnosis* / Q000401:mortality*; D004562:Electrocardiography / Q000295:instrumentation / Q000706:statistics & numerical data*; D004566:Electrodes; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000401:mortality*; D011379:Prognosis; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D016019:Survival Analysis; D015996:Survival Rate; D014421:Turkey / Q000453:epidemiology