title: Mitral Annular Plane Systolic Excursion-Derived Ejection Fraction: A Simple and Valid Tool in Adult Males With Left Ventricular Systolic Dysfunction.
abstract: OBJECTIVE
  Validation of a mitral annular plane systolic excursion (MAPSE)-derived formula to calculate the ejection fraction where EF = 4.8 × MAPSE (mm) + 5.8 in adult males with left ventricular (LV) dysfunction.
  
  
  BACKGROUND
  Echocardiographic assessment of LV function generally requires expert echocardiographer and is somewhat subjective and prone to reader discordance. MAPSE has been suggested as a surrogate measurement for LV function.
  
  
  METHODS
  Prospective analysis of 170 male patients with systolic dysfunction by two-dimensional transthoracic echocardiography was carried out. MAPSE and ejection fraction measured by qualitative visual inspection, M-mode, and biplane modified Simpson's rule were measured. MAPSE-derived EF was compared against other conventional methods to measure EF using Bland-Altman analysis and independent t-test.
  
  
  RESULTS
  There was a significant positive correlation between average MAPSE and EF measured by M-mode (r = 0.554, P < 0.001), Simpson's rule (r = 0.585, P < 0.001), and visual inspection (r = 0.611, P < 0.001). An average MAPSE cutoff value <= 5 provided the best balanced sensitivity (67.1%) and specificity (76.5%) to predict EF < 30%. The mean difference between MAPSE-derived EF and EF measured by visual inspection and by Simpson's method was 3.86 ± 5.24% and 3.57 ± 5.97%, respectively. The least mean difference of 0.5 ± 5.69% was present between MAPSE-derived EF and M-mode-measured EF (P value 0.2).
  
  
  CONCLUSIONS
  MAPSE-derived EF using the equation EF = 4.8 × MAPSE (mm) + 5.8 is a valid technique in adult males with severely impaired LV EF.
authors.affiliation: Cardiology Department, Ain Shams University Hospital, Cairo, Egypt.
authors.forename: Walaa
authors.initials: W
authors.lastname: Adel
authors.affiliation: Cardiology Department, Ain Shams University Hospital, Cairo, Egypt.
authors.forename: Alaa M
authors.initials: AM
authors.lastname: Roushdy
authors.affiliation: Cardiology Department, Ain Shams University Hospital, Cairo, Egypt.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Nabil
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D011446:Prospective Studies; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013318:Stroke Volume / Q000502:physiology; D013599:Systole; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging / Q000503:physiopathology*
keywords: MAPSE; ejection fraction; left ventricle function