Blood pressure and uterine artery doppler assessment
Non-invasive systolic and diastolic blood pressure was taken during each visit and MAP was calculated from SBP and DBP with the formula of MAP = 1/3 SBP + 2/3 DBP. Uterine artery flow velocity waveforms with colour-pulsed Doppler was performed during each visit via transabdominal ultrasound. Resistance and pulsatility indexes were recorded.