Epinephrine affects hemodynamics of noninnervated normal and all-trans retinoic acid-treated embryonic chick hearts.

Abstract:

OBJECTIVE:To study the acute effect of epinephrine on hemodynamics of noninnervated normal and retinoic-acid-treated embryos. DESIGN:Prospective interventional study design. METHODS:A total of 190 stage 15 (50-55 h of incubation) chick embryos were randomly treated with 1 microg all-trans retinoic acid and reincubated. At stage 20 (day 3) and stage 24 (day 4), dorsal aortic flow velocities were measured with a 20-MHz pulsed Doppler velocity meter, in normal and retinoic-acid-treated embryos. Flow velocity waveforms were assessed both before and after the administration of epinephrine (5 or 10 microg). RESULTS:Epinephrine caused a significant increase (p < 0.05) in heart rate, peak and mean velocities, peak acceleration, peak and mean blood flows, stroke volume and dorsal aortic area of both stage 20 and stage 24 normal and retinoic-acid-treated chick embryos. However, before epinephrine administration, stage 24 retinoic-acid-treated embryos displayed a significantly lesser increase in all outcome variables with the exception of dorsal aortic area. This was even observed after epinephrine administration. The effect of retinoic acid on cardiac output could not be compensated by epinephrine application. CONCLUSION:Epinephrine affects hemodynamics in both normal embryos and retinoic-acid-treated embryos prior to sympathetic innervation. A significant difference in hemodynamics exists between stage 24 normal and retinoic-acid-treated embryos. The underlying mechanism for the observed hemodynamic changes will need to be investigated.

journal_name

Fetal Diagn Ther

authors

Kroese JM,Broekhuizen ML,Poelmann RE,Mulder PG,Wladimiroff JW

doi

10.1159/000078996

keywords:

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

431-9

issue

5

eissn

1015-3837

issn

1421-9964

pii

78996

journal_volume

19

pub_type

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