title: Manifestation of latent left ventricular outflow tract obstruction caused by acute myocardial infarction: An important complication of acute myocardial infarction.
abstract: BACKGROUND
  Although transient left ventricular outflow tract (LVOT) obstruction is reported as a complication with acute myocardial infarction (AMI), the mechanisms and features of LVOT obstruction in AMI are unclear.
  
  
  RESULTS
  Herein, we present two cases of transient LVOT obstruction with anteroseptal AMI. The features of these two cases were one-vessel disease (1-VD) of the left anterior descending artery (LAD) and maintenance of blood flow to the major septal branch (SB). Moreover, LVOT obstruction was revealed after dobutamine infusion in the chronic phase and the aorto-septal angle was low in these two cases, meaning that latent LVOT obstruction was due to sigmoid-shaped septum.
  
  
  CONCLUSIONS
  Latent LVOT obstruction would be manifested in the acute phase of AMI. 1-VD of LAD and the maintenance of major SB blood flow are important factors with respect to the manifestation of latent LVOT obstruction.
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan. Electronic address: k-ozaki@hosp.niigata.niigata.jp.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Ozaki
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Okubo
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yano
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Komei
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Hosaka
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tsuchida
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Takahashi
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Miida
authors.affiliation: Department of Cardiology, Niigata City General Hospital, Niigata, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Oda
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications*; D014694:Ventricular Outflow Obstruction / Q000209:etiology / Q000503:physiopathology*
keywords: Acute myocardial infarction; Left ventricular outflow tract obstruction; Major septal branch; One-vessel disease; Sigmoid-shaped septum