The Influence of Blood Pressure on Fetal Aortic Distensibility: An Animal Validation Study.

Abstract:

BACKGROUND/AIMS:Aortic distension waveforms describe the change in diameter or cross-sectional area over the cardiac cycle. We aimed to validate the association of aortic fractional area change (AFAC) with blood pressure (BP) in a fetal lamb model. METHODS:Four pregnant ewes underwent open fetal surgery under general anesthesia at 107-120 gestational days. A 4-Fr catheter was introduced into the fetal femoral artery and vein, or the carotid artery and jugular vein. The thoracic aorta was imaged using real-time ultrasound; AFAC was calculated using offline speckle tracking software. Measurements of invasive BP and AFAC were obtained simultaneously and averaged over 10 cardiac cycles. BP was increased by norepinephrine infusion and the association of aortic distensibility with BP was assessed. RESULTS:Baseline measurements were obtained from 4 lambs, and changes in aortic distensibility with increasing BP were recorded from 3 of them. A positive correlation was found between AFAC and systolic BP (r = 0.692, p = 0.001), diastolic BP (r = 0.647, p = 0.004), mean BP (r = 0.692, p = 0.001), and BP amplitude (r = 0.558, p = 0.016) controlled for heart rate. No association was found between BP and maximum or minimum aortic area. CONCLUSION:AFAC provides a quantifiable measure of aortic distensibility and correlates with systolic BP, diastolic BP, mean BP, and BP amplitude in a fetal lamb model.

journal_name

Fetal Diagn Ther

authors

Wohlmuth C,Moise KJ Jr,Papanna R,Gheorghe C,Johnson A,Morales Y,Gardiner HM

doi

10.1159/000477396

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

226-230

issue

3

eissn

1015-3837

issn

1421-9964

pii

000477396

journal_volume

43

pub_type

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