title: Comparative feasibility of myocardial velocity and strain measurements using 2 different methods with transesophageal echocardiography during cardiac surgery.
abstract: OBJECTIVE
  To assess the feasibility and correlation between tissue Doppler and speckle tracking imaging when measuring myocardial velocity, strain, and strain rate with transesophageal echocardiography.
  
  
  METHODS
  A prospective, observational study.
  
  
  METHODS
  An academic tertiary-referral hospital.
  
  
  METHODS
  Patients undergoing elective heart surgery.
  
  
  METHODS
  None.
  
  
  RESULTS
  Velocity, strain, and strain rate were measured using both techniques in the inferior and anterior walls in transgastric views for radial motion and in the lateral, septal, anterior, and inferior walls in midesophageal views for longitudinal motion. Nineteen patients and 304 myocardial segments were studied. Overall, tissue Doppler was found to be more successful than speckle tracking in measuring myocardial velocity, whereas strain and strain rate measurements were achieved with comparable success using either method. Tissue Doppler was more successful than speckle tracking for radial cardiac motion, and the highest success rates were achieved with this method (93.4% v 59.2% for velocity, p < 0.001; 78.9% v 59.2% for strain, p = 0.01; and 73.7% v 59.2% for strain rate, p = 0.09). Good correlation between tissue Doppler and speckle tracking was shown in 4 myocardial segments: radial midinferior, radial basal inferior, radial basal anterior, and longitudinal basal septum (R = 0.6-0.82, p < 0.05).
  
  
  CONCLUSIONS
  The correlation between tissue Doppler and speckle tracking with transesophageal echocardiography appears valid when predominantly confined to segments moving in a radial direction adjacent to the ultrasound transducer. Tissue Doppler echocardiography of radial cardiac motion appears to be the most feasible technique of measuring myocardial velocity, strain, and strain rate during cardiac surgery.
authors.affiliation: Department of Anaesthesia, St Vincent's Hospital, Melbourne, Australia. gmaclaren@iinet.net.au
authors.forename: Graeme
authors.initials: G
authors.lastname: MacLaren
authors.forename: Roman
authors.initials: R
authors.lastname: Kluger
authors.forename: Kim A
authors.initials: KA
authors.lastname: Connelly
authors.forename: Colin F
authors.initials: CF
authors.lastname: Royse
mesh_terms: D000368:Aged; D006348:Cardiac Surgical Procedures / Q000379:methods*; D017548:Echocardiography, Transesophageal / Q000379:methods*; D005240:Feasibility Studies; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D009206:Myocardium; D011446:Prospective Studies