English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Ejection fraction (EF) is commonly measured by echocardiography, by dividingthe volume ejected by the heart (stroke volume) by the volume of the filledheart (end-diastolic volume). Utilizing volume changes of left myocardialsegments per a cardiac cycle, physical laws and mathematical equations specificechocardiographic data, this paper serves to generalize EF by a novel parameterover the time that it can make available, more detailed, valuable and practicalinformation to fully describe the left ventricular (LV) contractilityfunction.Patients who underwent clinically-directed standard transthoracicechocardiography using 2D conventional echocardiography machines armed tomeasuring strain components, were asked to estimate displacements andlongitudinal, radial and circumferential strains for each LV echocardiographicsegments per a cardiac cycle. Volume fractional changes of the LVechocardiographic segments are expanded based on their strain components overthe time. Ejected blood volume fraction induced by a left myocardial sample, iscomputed within a cardiac cycle. Total fraction of the ejected blood volume inthe left ventricular cavity was obtained by integrating over the times and LVmyocardial segments. EF is an especial value of this total fraction at the endsystolic time. The common measurement of EF is only based on LV cavity volumesat the end diastolic and systolic phases. These findings lead to determinedetailed aspects of the left ventricular contraction. This generalizedparameter has important implications to give the real value of EF in the severMitral valve regurgitations.

A novel quantitative indicator of the left ventricular contraction based on volume changes of the left ventricular myocardial segments