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In situ physiological study of the developing heart.

W F Friedman, S E Kirkpatrick

Recent Advances in Studies on Cardiac Structure and Metabolism

|January 1, 1975

Summary

Fetal and newborn lamb hearts show significant age-related differences in cardiac function and structure compared to adult sheep. These changes impact muscle contractility and ventricle compliance, with the left ventricle adapting post-birth.

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Area of Science:

Cardiovascular Physiology
Developmental Biology
Cardiac Muscle Biology

Background:

Cardiac function undergoes significant transformation from fetal to adult life.
Understanding these developmental changes is crucial for assessing cardiac health across the lifespan.
Age-related alterations in myocardial tissue composition and autonomic control are key factors.

Purpose of the Study:

To investigate age-dependent differences in cardiac ultrastructure and function in lambs.
To compare the passive and active length-tension properties, and force-velocity relationships between fetal, newborn, and adult sheep hearts.
To characterize the developmental changes in ventricular compliance and myocardial energetics.

Main Methods:

Comparative analysis of cardiac muscle and whole heart from fetal, newborn, and adult sheep.
Assessment of isometric force development, shortening extent, and velocity.
Evaluation of passive and active length-tension properties and ventricular compliance.
Utilized chronic evaluation methods for fetal left ventricular function, monitoring internal dimensions and pressures.

Main Results:

Fetal lamb hearts exhibit reduced isometric force development and shortening compared to adults due to lower myofilament proportions.
Left (LV) and right ventricles (RV) show comparable distensibility in near-term fetuses.
Postnatally, the RV retains fetal-like compliance, while the LV adapts to adult-like stress-strain characteristics.

Conclusions:

Significant age-dependent changes occur in lamb cardiac structure and function from fetal to adult stages.
Ventricular compliance shifts distinctly after birth, with the LV adapting more rapidly to adult characteristics.
Advanced methods now allow continuous monitoring of fetal cardiac function, aiding further research.

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