Objectives: To establish reference ranges for middle cerebral artery peak systolic velocity (MCA PSV) and to certify their value in the management of Rhesus alloimmunized pregnancies. Material and methods: A reference range of MCA PSV with gestation was constructed by studying 342 pregnancies at 25-40 weeks.

Single measurements of the MCA PSV blood flow have been found to predict the presence of moderate or severe anemia in fetuses with a sensitivity of 100 percent and a false positive rate of 12 percent with the number of false positive results increased after 35 weeks gestation.

These calculators are based on the analysis of data derived from routine second and third trimester screening studies conducted by the FMF. The Fetal Medicine Foundation is a Registered Charity that aims to improve the health of pregnant women and their babies through research and training in fetal medicine.

2007年8月24日 · To establish reference ranges suitable for serial assessments of the fetal middle cerebral (MCA) and umbilical (UA) artery blood flow velocities, pulsatility index (PI) and cerebroplacental pulsatility ratio and to provide terms for calculating conditional reference intervals suitable for individual serial measurements.

Doppler velocimetry of the middle cerebral artery (MCA) is a method to assess impedance/resistance to flow in the fetal brain circulation. Vasodilatation of the MCA is considered to reflect a compensatory phenomenon often referred to as the “brain sparing effect.”

2018年10月24日 · To develop gestational age-based reference ranges for the pulsatility index in the umbilical artery (UA-PI) and fetal middle cerebral artery (MCA-PI) and the cerebroplacental ratio (MCA-PI/UA-PI), and to examine the maternal characteristics and medical history that affect these measurements.

We aimed to establish gestational age-specific reference ranges for MCA-PSV in monochori-onic diamniotic (MCDA) twin pregnancies, to compare them with previously reported singleton reference ranges, and to establish terms for calculating conditional refer-ence intervals appropriate for individual serial measure-ments.

2020年5月30日 · The fetal middle cerebral artery (MCA) pulsatility index (PI) is a key parameter used in fetal middle cerebral arterial Doppler assessment. It is calculated by subtracting the end-diastolic velocity (EDV) from the peak systolic velocity (PSV) and then dividing by the time-averaged (mean) velocity (TAV):

Results: The MCA PSV and hemoglobin values increased with advancing gestational age. Multiples of the median (MOM) were calculated and reference charts were constructed for mild anemia (MCA PSV 1.29 MOM; hemoglobin 0.8 MOM), moderate anemia (MCA PSV 1.50 MOM; hemoglobin 0.6 MOM), and severe anemia (MCA PSV 1.55 MOM; hemoglobin 0.5 MOM).

Objectives: To construct gestation specific reference limits for fetal umbilical (UA), middle cerebral artery (MCA) pulsatility indices (PI) and the cerebroplacental ratio (CPR) in singleton...