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Developmental changes in impulse conduction in the canine heart

M R Rosen, M J Legato, R M Weiss

    The American Journal of Physiology
    |April 1, 1981
    PubMed
    Summary
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    Cardiac Purkinje fiber (PF) conduction velocity is faster in adult dogs than in young dogs. Structural changes in PF explain how stretch affects conduction velocity, with optimal velocity observed at 1.5 times control length.

    Area of Science:

    • Cardiovascular Physiology
    • Cardiac Electrophysiology
    • Structural Biology

    Background:

    • Age-related differences in cardiac conduction are not fully understood.
    • Purkinje fibers (PF) play a critical role in cardiac impulse propagation.
    • The impact of mechanical stretch on PF conduction velocity requires further investigation.

    Purpose of the Study:

    • To investigate age-related changes in Purkinje fiber conduction velocity.
    • To determine the effect of mechanical stretch on PF conduction properties.
    • To correlate structural changes in PF with alterations in conduction velocity.

    Main Methods:

    • Comparative electrophysiological studies on Purkinje fiber bundles from adult and 8-week-old dogs.
    • Assessment of conduction velocity, resting potential, action potential amplitude, and upstroke velocity under varying degrees of stretch.

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  • Histological analysis to examine structural changes, including cell membrane conformation and intracellular edema.

    • Main Results:

    • Conduction velocity in adult PF was significantly faster than in 8-week-old PF across all bundle lengths.
    • Maximum conduction velocity was achieved at approximately 1.5 times control bundle length for both age groups.
    • Beyond 1.5 times control length, conduction velocity, resting potential, action potential amplitude, and upstroke velocity decreased.
    • Structural changes, including increased PF to collagen ratio, cell membrane unfolding, diminished cleft size, and intracellular edema, were observed with increasing stretch.

    Conclusions:

    • Structural alterations in cardiac Purkinje fibers are responsible for changes in conduction velocity induced by mechanical stretch.
    • Adult Purkinje fibers exhibit superior conduction velocity compared to younger ones, irrespective of stretch.
    • These findings provide insights into age-dependent differences in cardiac electrical activity and the biomechanical regulation of conduction.