Non-invasive myocardial performance mapping using 3D echocardiographic stress–strain loops

Abstract

Regional contribution to left ventricular ejection is of much clinical importance but its assessment is notably challenging. While deformation imaging is often used, this does not take into account loading conditions. Recently, a method for intraventricular pressure estimation was proposed, thus allowing for loading conditions to be taken into account in a non-invasive way. In this work, a method for 3D automatic myocardial performance mapping in echocardiography is proposed by performing 3D myocardial segmentation and tracking, thus giving access to local geometry and strain. This is then used to assess local left ventricular stress-strain relationships which can be seen as a measure of local myocardial work. The proposed method was validated against 18F-fluorodeoxyglucose positron emission tomography, the reference method to clinically assess local metabolism. Averaged over all patients, the mean correlation between FDG-PET and the proposed method was 0.67 ± 0.18. In conclusion, stressstrain loops were, for the first time, estimated from 3D echocardiography and correlated to the clinical gold standard for local metabolism, showing the future potential of RT3DE for the assessment of local metabolic activity of the heart.

Successful Cardiac Resynchronization Therapy Reduces Negative Septal Work in Patient-Specific Models of Dyssynchronous Heart Failure

“…Our use of ventricular pressure as a surrogate for stress is supported by earlier work which found agreement with regional oxygen uptake(10), accuracy across several physiologic states(39), and clinical utility(24,40,41). However, earlier work has also documented the limitation of pressure-strain estimates(42). In this work, our goal was not to replace stress-strain but to use the framework to identify a more readily available surrogate of regional myocardial work that can be applied to CRT patients.…”