Diagnosis, management, and evaluation of hypertensive disorders of pregnancy.

The authors implied that the abnormal uterine artery Doppler velocimetry is one of the risk markers for preeclampsia in the second or third trimester and that its abnormality is practically defined at 22–24 weeks as bilateral notching with mean resistance index (RI) > 0.55 (i.e., > 50th centile), unilateral notching with mean RI > 0.65 (> 90th centile), or no notching with mean RI > 0.70 (> 95th centile).1 We agree that these three indices are very good predictors of preeclampsia.2 However, we do not share the view that the resistance index and its combinations with notching are the most predictive indices of the uterine artery Doppler velocimetry for the development of preeclampsia. The cited study does not compare the predictive capacity of the mentioned three indices with the other indices of the uterine artery Doppler velocimetry.