Equations of Willems et al for Left Ventricular Ejection Time (LVET): Complex Equation

 

Patient selection: older adult > 60 years of age

 

Parameters:

(1) heart rate in beats per minute

(2) arm-to-tongue circulation time in seconds

(3) transverse heart diameter in mm in the AP chest X-ray (maximal horizontal diameter)

(4) systolic blood pressure in mm Hg

(5) hemoglobin in g/dL

 

LVET in milliseconds =

= 465 - (1.71 * (heart rate)) - (0.53 * (circulation time)) - (0.25 * (transverse heart diameter)) + (0.13 * (systolic blood pressure)) - (1.89 * (hemoglobin))

 

Performance:

• R was 0.79.