Table 1. Calculation method of the left atrial emptying function.

Passive empting function (diameters)—fractional shortening	PassEmpD-FS	(LADmax–LADmid)/LADmax
Active empting function (diameters)—fractional shortening	ActEmpD-FS	(LADmid–LADmin)/LADmid
Complete empting function (diameters)—fractional shortening	CompEmpD-FS	(LADmax–LADmin)/LADmax
Passive empting function (volumes)—ejection fraction	PassEmpV-EF	(LAVmax–LAVmid)/LAVmax
Active empting function (volumes)—ejection fraction	ActEmpV-EF	(LAVmid–LAVmin)/LAVmid
Complete empting function (volumes)—ejection fraction	ComEmpV-EF	(LAVmax–LAVmin)/LAVmax

(LA): left atrium; (LAD): left atrial diameter; (LAV): left atrial volume; (FS): fractional shortening; (EF): ejection fraction; (LADmax): left atrial linear dimension at the ventricular end-systole; (LADmid): left atrial linear dimension immediately before the P wave on the ECG; (LADmin): left atrial linear dimension at ventricular end-diastole; (LAVmax): left atrial volume at the ventricular end-systole; (LAVmid): left atrial volume immediately before the P wave on the ECG; (LAVmin): left atrial volume at ventricular end-diastole; (PassEmpD-FS): LA passive function based on diameters; (ActEmpD-FS): LA active function based on diameters; (ComEmpD-FS): LA complete function based on diameters; (PassEmpV-EF): LA passive function based on volumes; (ActEmpV-EF): LA active function based on volumes; (ComEmpV-EF): LA complete function based on volumes. Note: all the FS and EF measurements are expressed as a percentage (formula × 100%).