title: The association between prolongation in QRS duration and presence of coronary collateral circulation in patients with acute myocardial infarction.
abstract: BACKGROUND
  It is known that QRS duration is related to prognosis in acute myocardial infarction. The relation between QRS duration and coronary collateral circulation is uncertain. In the present study, we aimed to determine the relation between QRS duration and coronary collateral circulation in patients admitted with acute myocardial infarction.
  
  
  METHODS
  The present study was composed of 109 consecutive patients with acute myocardial infarction. All patients had total occlusion in the left anterior descending coronary artery. Electrocardiographic recordings on admission were obtained for the assessment of QRS duration. The Rentrop classification was used to define coronary collateral circulation on coronary angiography. Patients were divided into two groups as follows: Group 1 with poor coronary collateral circulation (Rentrop 0-1) and Group 2 with good coronary collateral circulation (Rentrop 2-3).
  
  
  RESULTS
  Of all patients, 62 patients were included in group 1 and 47 patients in group 2, respectively. In the present study, patients in the group 1 had longer QRS duration than patients in the group 2 (p < 0.005). Additionally, we found that Rentrop grading had negative correlation with both QRS duration and white blood cell count (r: -0.28; p < 0.005 and r: -0.35; p < 0.001).
  
  
  CONCLUSIONS
  Our study showed that there was an inverse relationship between QRS duration on admission and presence of coronary collateral circulation in patients with acute myocardial infarction.
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Zülküf
authors: Z
authors: Karahan
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Bernas
authors: B
authors: Altıntaş
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Murat
authors: M
authors: Uğurlu
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: İlyas
authors: İ
authors: Kaya
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Berzal
authors: B
authors: Uçaman
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Ali Veysel
authors: AV
authors: Uluğ
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Rojhat
authors: R
authors: Altındağ
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Yakup
authors: Y
authors: Altaş
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Mehmet Şahin
authors: MŞ
authors: Adıyaman
authors: Gazi Yasargil Education and Research Hospital, Turkey.
authors: Önder
authors: Ö
authors: Öztürk
keywords: QRS duration; coronary collateral circulation; myocardial infarction