title: Assessment of the effect of off-pump coronary artery bypass (OPCAB) surgery on right ventricle function using strain and strain rate imaging.
abstract: BACKGROUND
  Right ventricle function significantly decreases after coronary artery bypass surgery; as one of the likely causes, such a condition is attributed to the use of cardiopulmonary pump (CPB). Because nowadays there is a tendency toward increasing use of off-pump coronary artery bypass (OPCAB) surgery, this study was conducted to evaluate the right ventricle function after this type of surgery using strain and strain rate imaging (SRI) echocardiography.
  
  
  METHODS
  This study was conducted on 30 patients, candidate for elective OPCAB surgery, between 2011 and 2012. Standard echocardiography was performed before the surgery and the right ventricle function was examined using strain and SRI echocardiography. Then patient underwent surgery, 6 days and 3 months after surgery they underwent echocardiography again and the results obtained from the three stages were compared with each other.
  
  
  RESULTS
  Participants included 30 patients (23 males and 7 females) with a mean age of 66±11 years. Compared to the prior of the surgery, 6 days and 3 months after the surgery there was a significant decrease in tricuspid annular plane systolic excursion (TAPSE), tissue Doppler imaging (TDI) at the lateral annulus of tricuspid valve, and strain and SRI of right ventricle. However, the values obtained 3 months after surgery were significantly higher than those obtained after 6 days. In other words, the right ventricle function 6 days after the surgery had dropped, however some of the values recovered 3 months after the surgery.
  
  
  CONCLUSIONS
  The findings of this study are consistent with other studies in this field and showed that after coronary artery surgery a decline occurs in right ventricular function. However, more detailed quantitative strain and SRI parameters which were measured in our study showed that at the early days after the OPCAB surgery there is a decline in the right ventricle function which is relatively reversible at longer intervals (3 months after surgery).
authors.affiliation: 1 Cardiovascular Research Center, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 2 Cardiovascular Research Center, Department of cardiovascular surgery, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 3 Students Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Khani
authors.affiliation: 1 Cardiovascular Research Center, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 2 Cardiovascular Research Center, Department of cardiovascular surgery, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 3 Students Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mahsa
authors.initials: M
authors.lastname: Hosseintash
authors.affiliation: 1 Cardiovascular Research Center, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 2 Cardiovascular Research Center, Department of cardiovascular surgery, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 3 Students Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mahnoosh
authors.initials: M
authors.lastname: Foroughi
authors.affiliation: 1 Cardiovascular Research Center, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 2 Cardiovascular Research Center, Department of cardiovascular surgery, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 3 Students Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Naderian
authors.affiliation: 1 Cardiovascular Research Center, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 2 Cardiovascular Research Center, Department of cardiovascular surgery, Modarres hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; 3 Students Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Isa
authors.initials: I
authors.lastname: Khaheshi
keywords: Right ventricle function; off-pump coronary artery bypass surgery (OPCAB surgery); off-pump coronary artery bypass surgery (OPCAB); strain and strain rate imaging echocardiography (strain and SRI echocardiography)