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Updated: Jun 28, 2026

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation

Demystifying Venous Excess Ultrasound (VExUS): Image Acquisition and Interpretation

Published on: May 16, 2025

Vasa praevia: a missed diagnosis.

P Sinha¹, S Kaushik, N Kuruba

¹Conquest Hospital, St Leonard's on Sea, East Sussex, UK. prabha.sinha@esht.nhs.uk

Journal of Obstetrics and Gynaecology : the Journal of the Institute of Obstetrics and Gynaecology

|November 13, 2008

Summary

Vasa praevia diagnosis is crucial for preventing fetal death. Prenatal diagnosis via ultrasound and timely C-section delivery significantly improve outcomes for this rare obstetric complication.

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Area of Science:

Obstetrics and Gynecology
Fetal Medicine
Diagnostic Ultrasound

Background:

Vasa praevia is a rare obstetric emergency with high fetal mortality if undiagnosed.
Lack of antenatal diagnosis often prevents timely intervention, leading to fetal exsanguination due to torn fetal vessels.

Observation:

Three cases of vasa praevia presenting with antepartum and intrapartum bleeding were observed.
Two cases were associated with suspected low-lying placenta, highlighting risk factors.

Findings:

Advances in ultrasound, particularly transvaginal color flow Doppler, improve diagnostic capabilities for vasa praevia.
Early diagnosis enables timely intervention, with C-section recommended at 35-36 weeks gestation.

Implications:

Routine screening with transvaginal color Doppler in high-risk pregnancies (e.g., low-lying placenta, velamentous cord insertion, IVF, multiple gestation) is recommended.
Increased vigilance and integration of advanced ultrasound techniques are vital for preventing fetal mortality associated with vasa praevia.