EROA = Flow/Peak velocity - EROA = 207/531 = 0.39 cm² - R Vol = EROA x TVI - R Vol = 0.39 cm² x 158 cm = 61mL

Recordings

• Apical four-chamber
• Optimize colour flow imaging of MR
• Zoom the selected image
• Decrease the Nyquist limit (colour flow zero baseline)
• With the cine mode select the best PISA
• Display the colour off and on to visualize the MR orifice
• Measure the PISA radius at mid-systole using the first aliasing and along the direction of the ultrasound beam
• Measure MR peak velocity and TVI (CW)
• Calculate flow rate, EROA, R Vol