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Antegrade late diastolic arterial blood flow in the fetus: insight into fetal atrial function.

Abstract：

OBJECTIVE:The purpose of this study was to examine the presence and frequency of antegrade late diastolic arterial blood flow (ALDAF) in the fetus and to determine its contribution to cardiac output. STUDY DESIGN:We evaluated the presence of ALDAF in 457 fetal and 21 postnatal echocardiograms. The timing of ALDAF to the ventricular systolic Doppler recording (ALDAF-V) was compared with the mechanical atrioventricular interval and, in neonates, the electrical PR interval. Velocity time integrals of ALDAF and the ventricular systolic Doppler signals were measured, and the percent contribution of ALDAF was calculated. RESULTS:ALDAF was observed in 365 of 457 studies and included all <11 weeks' gestations. Strong correlation between ALDAF-V, atrioventricular interval, and electrical PR interval suggests that ALDAF coincides with atrial contraction. ALDAF contributed substantially to cardiac output in early gestation with later decline. CONCLUSION:ALDAF results from atrial contraction. Increasing gestational age results in less ALDAF, and reduced ALDAF contribution to cardiac output likely due to improved diastolic function.

journal_name

Am J Obstet Gynecol

journal_title

American journal of obstetrics and gynecology

authors

Howley LW,Yamamoto Y,Sonesson SE,Sekar P,Jain V,Motan T,Savard W,Wagner BD,Trines J,Hornberger LK

doi

10.1016/j.ajog.2013.02.053

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

490.e1-8

issue

6

eissn

0002-9378

issn

1097-6868

pii

S0002-9378(13)00291-3

journal_volume

208

pub_type

杂志文章

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