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EPSS is an accurate and rapid bedside estimation of left ventricular function
First an image of heart should be obtained in the parasternal long-axis view
The ultrasound cursor should be placed through the anterior leaflet of the mitral valve
Subsequently, M-mode is applied and the distance between the anterior leaflet and the interventricular septum is measured during early diastole
A measurement of 7mm or greater indicates poor EF (see attachment below)
References
Secko MA, Lazar JM, Salcicciolo LA, Stone MB. Can junior emergency medicine physicians use E-point septal separation to accurately estimate left ventricular function in acutely dyspneic patients. Acad Emerg Med. 2011;18:1223-6