Echocardiografic criteria for severe aortic regurgitation:
- enlargement of LV,
- abnormal AV / flail AV leaflet / large AV coaptation defect,
- large central AR jet / variable eccentric AR jet ,
- AR VC width > 6 mm,
- dense CW signal of AR jet,
- AR PHT < 200 ms,
- AR EROA > 30 mm²,
- AR Vol. > 60 ml/beat,
- holodiastolic flow reversal in Ao Desc,
- EDV of  holodiastolic flow reversal in Ao Desc > 20 cm/s.