Abstract
Background
An impairment of certain echocardiographic parameters of right ventricular (RV) function, such as tricuspid annular peak systolic excursion (TAPSE), is a known phenomenon in patients undergoing cardiac surgery. However, little is known about significance of these alterations with regard to other aspects of RV function. The aim of our study was to clarify this issue using parameters based on 3D echocardiography and speckle tracking technique.
Methods
The study population comprised 122 patients (92 men, mean age 65±11 years), referred for coronary artery bypass grafting and/or replacement of mitral or aortic valve. Patients undergoing tricuspid annuloplasty and with baseline suboptimal image quality were excluded from the study group. Transthoracic echocardiographic examination was performed on average 2±2 days prior to surgery (TTE1), and 7±4 days after surgery (TTE2), whereas follow-up TTE (TTE3) was performed on average 12±2months after the surgery. Parameters measured during these examinations included both standard and advanced indices of RV size and function (such as TAPSE, systolic velocity of tricuspid annulus (S'), fractional area change (FAC), RV ejection fraction (EF) and RV global longitudinal systolic strain (GLS), as well as a new parameter introduced by our team - RV shortening fraction (RV SF), calculated as the change in mid RV transverse diameter.
Results
Echocardiographic measurements were completed for TTE1, TTE2 and TTE3 in 95% of patients. We noticed a significant postoperative (TTE2) impairment of parameters of RV longitudinal function (TAPSE, S' and GLS; p<0,0001). However, neither RV size assessed by both 2D and 3D technique changed, nor the global RV function measured with the use of FAC and EF. Additionally during the postoperative period an increase in the value of a RV SF by 12.85% was observed. After 12 months (TTE3) we observed an improvement in the parameters of the longitudinal RV function.
Conclusion
Cardiac surgery results in an impairment of the longitudinal systolic RV function, with no influence on the global RV function. The preservation of global function results from increased RV SF. After 12 months, an improvement of the longitudinal function can be observed.
Funding Acknowledgement
Type of funding source: Public Institution(s). Main funding source(s): Grant Polish Cardiac Society
Successful conservative management of blunt right ventricular rupture in a patient with prior cardiac surgery
