title: Effect of position changes on myocardial velocity in healthy subjects evaluated by tissue Doppler echocardiography.
abstract: OBJECTIVE
  This study designed to assess the effect of different positions of head of the bed on myocardial velocity by tissue Doppler echocardiography in healthy subjects.
  
  
  METHODS
  Thirty-nine healthy subjects (32 males/7 females, mean age 24.7 ± 4.9 years) were studied. Tissue Doppler imaging (TDI) was performed and velocities were recorded during systole (Sm) and early (Em) and late (Am) diastole at the tricuspid annulus, septum, and mitral annulus in the four-chamber view. Measurements were performed from different positions of left lateral decubitus (0°, 30°, and 60°). Repeated-measures general linear models were used to assess the change in myocardial velocities.
  
  
  RESULTS
  No significant difference between myocardial velocities was found at the mitral anulus and septal TDI recordings in the different angles of left lateral decubitus positions (P > 0.05). However, there were statistically significant difference among tricuspid anulus myocardial tissue velocities in these positions (P < 0.05).
  
  
  CONCLUSIONS
  Tricuspid anulus myocardial tissue velocities may be significantly influenced by changing of position in healthy subjects. Effect of position changes should be considered in the assessment of these velocities.
authors.affiliation: GATA Haydarpasa Training Hospital, Department of Cardiology, Istanbul, Turkey. homeruz@gmail.com
authors.forename: Omer
authors.initials: O
authors.lastname: Uz
authors.forename: Ejder
authors.initials: E
authors.lastname: Kardesoglu
authors.forename: Mehmet
authors.initials: M
authors.lastname: Uzun
authors.forename: Zafer
authors.initials: Z
authors.lastname: Isilak
authors.forename: Omer
authors.initials: O
authors.lastname: Yiginer
authors.forename: Mustafa
authors.initials: M
authors.lastname: Aparcı
authors.forename: Namik
authors.initials: N
authors.lastname: Ozmen
authors.forename: Bekir Sitki
authors.initials: BS
authors.lastname: Cebeci
mesh_terms: D015150:Echocardiography, Doppler / Q000379:methods*; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging*; D006801:Humans; D009200:Myocardial Contraction / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D016277:Ventricular Function, Left / Q000502:physiology*; D055815:Young Adult