In 1962, Folse and Braunwald used the ratio of forward stroke volume/EDV and observed that "estimations of the fraction of the left ventricular end-diastolic volume that is ejected into the aorta during each cardiac cycle, as well as of the ventricular end-diastolic and residual volumes, provide information that is fundamental to a hemodynamic analysis of left ventricular function". In 1965 Bartle et al. used the term ejected fraction for the ratio SV/EDV, and the term ejection fraction was used in two review articles in 1968 suggesting a wide currency by that time.