TY - CHAP M1 - Book, Section TI - Fetal Brain Circulation A1 - Figueras, Francesc A1 - Gull, Ilan A2 - Malinger, Gustavo A2 - Monteagudo, Ana A2 - Pilu, Gianluigi A2 - Paladini, Dario A2 - Timor-Tritsch, Ilan E. Y1 - 2023 N1 - T2 - Timor's Ultrasonography of the Prenatal Brain, 4e AB - KEY POINTSThe peak systolic velocity (PSV) and the pulsatility index (PI) are the commonly used clinical parameters for the evaluation of fetal cerebral blood perfusion.Ultrasonic measurement of the middle cerebral artery peak systolic velocity (MCA PSV) can predict the existence of moderate-to-severe fetal anemia.Under hypoxic conditions, the fetus redistributes its flow toward the brain, a phenomenon called brain sparing.56 This brain sparing effect is reflected in the MCA flow that shows decreased pulsatility at Doppler evaluation. Decreased pulsatility, which reflects low cerebral resistance to blood flow, constitutes a late manifestation, with acceptable specificity but low sensitivity for clinical applicability. SN - PB - McGraw Hill Education CY - New York, NY Y2 - 2024/10/08 UR - obgyn.mhmedical.com/content.aspx?aid=1194721632 ER -