Semiquantitative classification of ductus venosus blood flow patterns. (May 2014)

• Record Type: Journal Article
• Authors: Turan, O. M.; Turan, S.; Sanapo, L.; Rosenbloom, J. I.; Baschat, A. A.
• Is Part Of: Ultrasound in obstetrics & gynecology. Volume 43:Number 5(2014:May)
• Page Start: 508
• Page End: 514
• Publication Date: 2014-05
• Subjects: Ultrasonics in obstetrics -- Periodicals; Generative organs, Female -- Diseases -- Diagnosis -- Periodicals; Diagnosis, Ultrasonic -- Periodicals; Genital Diseases, Female -- ultrasonography -- Periodicals; Ultrasonography, Prenatal -- Periodicals; 618.047543
• DOI: 10.1002/uog.13207
• Languages: English
• ISSNs: 0960-7692

Abstract

<abstract abstract-type="main" id="uog13207-abs-0001"> <title>ABSTRACT</title> <sec id="uog13207-sec-0001" sec-type="section"> <title>Objectives</title> <p id="uog13207-para-0001">To identify the range of waveform abnormalities in the ductus venosus (DV) characterized by their timing in the cardiac cycle and to evaluate if they can be categorized into distinct patterns.</p> </sec> <sec id="uog13207-sec-0002" sec-type="section"> <title>Methods</title> <p id="uog13207-para-0002">DV velocity ratios were calculated from peak velocities during ventricular systole (S), end‐systolic ventricular relaxation (v), early diastole (D) and atrial systole (a) (S/v, S/D, v/D, S/a, v/a and D/a ratios). The ratios were converted to their <italic>Z</italic>‐scores and elevation > 2 SD was assigned as abnormal. Combinations of ratio abnormalities were grouped to define distinct waveform patterns and their distribution was related to the clinical presentation.</p> </sec> <sec id="uog13207-sec-0003" sec-type="section"> <title>Results</title> <p id="uog13207-para-0003">Five‐hundred and forty‐two abnormal DV waveforms fell into three principal patterns. In Pattern 1 only the a‐wave‐related ratios were abnormal (180, 33.2%), in Pattern 2 the v/D ratio was abnormal (143, 26.3%) and in Pattern 3 combinations of a‐wave abnormalities in the presence of a normal v/D ratio were normal (94, 17.3%).</p> </sec> <sec id="uog13207-sec-0004" sec-type="section"> <title>Conclusions</title> <p id="uog13207-para-0004">Interpretation of venous waveform patterns is complex because the multiphasic waveforms reflect events in the cardiac cycle that may be differentially affected by clinical pathology. We sought to present a classification for the DV flow profile that characterizes abnormal flow confined to atrial systole and occurs during ventricular relaxation or during holodiastole. Further research is warranted to determine the significance of these patterns in specific fetal conditions. Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd.</p> </sec> </abstract>