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A Novel Ex Ovo Banding Technique to Alter Intracardiac Hemodynamics in an Embryonic Chicken System
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Blood flow patterns underlie developmental heart defects

Madeline Midgett1, Kent Thornburg2, Sandra Rugonyi3,2

  • 1Biomedical Engineering, Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon; and.

American Journal of Physiology. Heart and Circulatory Physiology
|January 8, 2017
PubMed

Insights

Altered embryonic blood flow significantly impacts heart development, leading to specific congenital heart defects. This study reveals a dose-response relationship between blood flow changes and cardiac malformations, suggesting a key role for hemodynamics.

Area of Science:

  • Developmental Biology
  • Cardiovascular Physiology
  • Embryology

Background:

  • Congenital heart defects (CHDs) are often linked to genetic factors, but the role of embryonic hemodynamics is less understood.
  • Early embryonic blood flow patterns are critical for normal cardiovascular development.
  • The precise relationship between altered embryonic blood flow and specific cardiac malformations requires further investigation.

Purpose of the Study:

  • To investigate the predictive value of anomalous embryonic blood flow patterns for cardiac defects.
  • To quantify the relationship between altered blood flow dynamics and the development of specific cardiovascular malformations.
  • To establish a dose-response correlation between hemodynamic stimuli and cardiac phenotypes in an embryonic model.

Main Methods:

  • Utilized the chicken embryo model to experimentally alter embryonic blood flow.
  • Quantified the effects of restricted cardiac inflow and graded outflow constriction on heart development.
  • Observed and categorized resulting cardiac and vascular malformations, including ventricular septal defects and pharyngeal arch artery defects.

Main Results:

  • Reduced cardiac inflow and graded outflow constriction led to reproducible cardiac abnormalities.
  • Specific outflow constriction levels correlated with distinct defects: 10-35% constriction caused ventricular septal defects, while 35-60% caused double outlet right ventricle.
  • Vitelline vein ligation resulted predominantly in pharyngeal arch artery malformations, demonstrating the impact of altered hemodynamics on vascular development.

Conclusions:

  • Embryonic blood flow dynamics are a significant determinant of cardiac structure and function, influencing specific malformation types.
  • Hemodynamic-associated cardiac defects in this model recapitulate those seen in human genetic disorders.
  • Understanding embryonic blood flow is crucial for elucidating the root causes of congenital heart disease and developing future prevention and treatment strategies.

Keywords:
chick embryocongenital heart defectshemodynamicsoutflow tract bandingvitelline vein ligation

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