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Related Experiment Videos

Transitions in ventricular activation revealed by two-dimensional optical mapping.

Emil Thomas Chuck1, Kathleen Meyers, David France

  • 1Neonatal-Perinatal Research Institute, Division of Neonatology, Department of Pediatrics and Department of Cell Biology, Duke University Medical Center, Durham, North Carolina, USA.

The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology
|September 17, 2004
PubMed
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Embryonic chick hearts develop electrical activity gradually. Conduction system precursors, identified by location, mature electrophysiologically during cardiac morphogenesis, transitioning from uniform to focal activation patterns.

Area of Science:

  • Developmental Biology
  • Cardiac Electrophysiology
  • Molecular Cardiology

Background:

  • The mature heart relies on the His-Purkinje system for function.
  • Early embryonic hearts pump blood without a specialized conduction system.
  • The electrical function of His-Purkinje system precursors is largely unknown.

Purpose of the Study:

  • To investigate the electrical function of embryonic chick heart conduction system precursors.
  • To characterize the electrophysiological development of the embryonic heart from tubular to septated stages.
  • To correlate the emergence of electrical activity with the location of conduction system precursors.

Main Methods:

  • High-resolution optical mapping using voltage-sensitive (di-4-ANEPPS) and calcium-sensitive (Fluo-4) dyes.

Related Experiment Videos

  • Two CCD cameras for motion-corrected activation pattern analysis.
  • Electrophysiological assessment of 76 embryonic chick hearts (stages 10-35).

    • Main Results:

    • Sequential, uniform ventricular activation observed in early tubular hearts (stages 10-17).
    • Emergence of preferential activation sites in dorsal and lateral ventricles in late looped hearts (stages 18-22).
    • Action potential breakthrough from dorsal ventricle (stages 22-26) and later from right ventricle apex (stages 27-29), correlating with precursor locations.

    Conclusions:

    • Embryonic ventricular activation transforms gradually from sequential to a mature pattern.
    • Cardiac conduction system precursors appear electrophysiologically distinct and mature progressively.
    • This study provides detailed electrophysiological insights into early cardiac development and conduction system maturation.