First Phase Ejection Fraction (EF1 Sample Clauses

First Phase Ejection Fraction (EF1. ‌ EF1 is the proportion of blood ejected from the ventricular cavity from the opening of the aortic valve to the first peak of aortic flow. EF1 is calculated by the following equation: 𝐿𝑉𝐸𝐷𝑉 − 𝐿𝑉 𝑣𝑜𝑙𝑢𝑚𝑒 𝑎𝑡 𝑡𝑖𝑚𝑒 𝑜𝑓 𝑝𝑒𝑎𝑘 𝑎𝑜𝑟𝑡𝑖𝑐 𝑓𝑙𝑜𝑤 𝐿𝑉𝐸𝐷𝑉 × 100 Where LVEDV is left ventricular end-diastolic volume. EF1 therefore differs from LVEF in that it records only the fraction of blood ejected until the point of maximal ventricular contraction (i.e. the first peak of aortic flow), rather than the fraction of blood ejected throughout the whole of systole.