title: The relation between mitral annulus motion and ejection fraction: a nonlinear function.
abstract: In previous studies of the relation between mitral annulus motion (MAM) and left ventricular ejection fraction (EF), a linear relationship has been suggested. In this meta-analysis of 434 patients, we show that the relation is nonlinear and that a linear regression model overestimates EF in the lower range of MAM. The relation is better described by an S function and is influenced by age and heart size.
authors.affiliation: Department of Clinical Physiology, Orebro Medical Center Hospital, Sweden. kent.emilsson@orebroll.se
authors.forename: K
authors.initials: K
authors.lastname: Emilsson
authors.forename: M
authors.initials: M
authors.lastname: Alam
authors.forename: B
authors.initials: B
authors.lastname: Wandt
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017023:Coronary Angiography; D006801:Humans; D016014:Linear Models; D008875:Middle Aged; D008943:Mitral Valve / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D011875:Radionuclide Angiography; D013318:Stroke Volume; D014463:Ultrasonography