Publications by authors named "Alec William Welsh"
Article Synopsis
- The study aimed to determine how many pulsed-wave Doppler (PWD) waveforms need to be averaged to minimize variability in Doppler indices during uncomplicated singleton pregnancies.
- A total of 189 pregnancies were analyzed, focusing on the umbilical artery, middle cerebral artery, and uterine arteries, with findings showing that the pulsatility index (PI) was more variable than the resistance index (RI).
- To achieve a 5% variability in PI, at least 14 waveforms needed to be averaged for both UA and MCA, while the RI required only 2 for UA, 1 for MCA, and 8 for UtAs, suggesting that RI may be a more stable indicator for maternal-fetal Doppler assessments
Introduction: Three-dimensional fractional moving blood volume (3D-FMBV) may provide superior noninvasive measurement of feto-placental perfusion compared to current methods. This study investigated the feasibility and repeatability of producing 3D-FMBV measurements of the placenta, fetal liver, kidney, and brain in a single ultrasound consultation.
Methods: The placenta, fetal liver, kidney, and brain were scanned in triplicate using 3D power Doppler ultrasound (3D-PDU) in 48 women ≥22 weeks of gestation with healthy fetuses.
The Influence of Hyperoxygenation on Fetal Brain Vascularity Measured Using 3D Power Doppler Ultrasound and the Index "Fractional Moving Blood Volume".
Fetal Diagn Ther
November 2021
Introduction: Maternal hyperoxygenation effects on fetal cerebral hemodynamics are largely unknown. This study aimed to determine efficacy and reliability of a validated power Doppler ultrasound (US) index, fractional moving blood volume (FMBV), at measuring fetal cerebral vasculature changes during maternal hyperoxia.
Methods: The fetal cerebral effects of 10 min of hyperoxygenation at 2 flow rates (52%/60% FiO2) were evaluated in women in their third trimester of pregnancy.
Objective: To audit immediate pregnancy and neonatal outcomes of selective laser photocoagulation of communicating vessels (SLPCV) for twin-twin transfusion syndrome (TTTS) at the New South Wales Fetal Therapy Centre.
Methods: Retrospective cohort study of 151 TTTS cases undergoing SLPCV between July 2003 and May 2013, evaluating procedural details, delivery and perinatal outcomes.
Results: The majority of cases were Stage III at SLPCV (56.