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A Novel Ex Ovo Banding Technique to Alter Intracardiac Hemodynamics in an Embryonic Chicken System
Published on: May 13, 2016
Cardiac outflow and wall motion in hypothermic chick embryos
Sang-Joon Lee1, Eunseop Yeom, Hojin Ha
1Center for Biofluid and Biomimic Research, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, South Korea. sjlee@postech.ac.kr
Microvascular Research
|October 6, 2011
Summary
Environmental hypothermia causes bradycardia and abnormal blood flow in chick embryonic hearts. Reduced myocardial wall motion under cold conditions leads to decreased systolic velocity and diastolic backflow in the outflow tract.
Area of Science:
- Developmental biology
- Cardiovascular physiology
- Embryology
Background:
- Early cardiac outflow in chick embryos is sensitive to environmental temperature.
- Understanding temperature effects on embryonic heart function is crucial for developmental studies.
Purpose of the Study:
- To investigate the impact of environmental hypothermia on blood flow dynamics in the chick embryonic outflow tract (OFT).
- To correlate observed flow changes with myocardial wall motion under hypothermic conditions.
Main Methods:
- Microscopic particle image velocimetry was used to capture instantaneous velocity fields of blood flow.
- Simultaneous measurement of outflow tract vessel diameter and wall thickness.
- Experiments conducted on chick embryos at Hamburger-Hamilton (HH) stage 17.
Main Results:
- Environmental hypothermia induced bradycardia (slowed heart rate).
- A decrease in peak systolic velocity and the occurrence of diastolic backflow were observed in the OFT.
- These hemodynamic changes correlated with suppressed myocardial wall motion.
Conclusions:
- Hypothermia significantly alters embryonic cardiac outflow dynamics in chick embryos.
- Suppressed myocardial contractility is a likely mechanism behind hypothermia-induced cardiovascular abnormalities.
- Findings provide insights into the vulnerability of early heart development to thermal stress.
