Data Extraction and Collection
Ultimately, there were main 3 review, 2 systematic review and
meta‑analysis, 1 meta-analysis and 35 articles on evaluation of LV
chamber stiffness or myocardial stiffness, including 6 studies on the
ratios of echocardiographic surrogates of LV end-diastolic pressure to
LV size methods, 18 on the diastolic wall strain (DWS) methods, 5 on the
intrinsic velocity propagation of myocardial stretch (iVP) methods, 5 on
the myocardial shear wave imaging (SWI) and 1 on the time-velocity
integral (TVI) measurements of pulmonary venous and transmitral flows
method. Also, data for most articles are entered into a table including
echocardiographic method technique, author, year, type of study, main
findings, new index statistical differences, correlation with adverse
events and predictive value, receiver-operating characteristic analysis,
and reproducibility (Table 2).