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Related Experiment Videos

Ventricular activation process in minipigs.

R L Hamlin, R R Burton, S D Leverett

    Journal of Electrocardiology
    |January 1, 1975
    PubMed
    Summary
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    This study investigated pig ventricular activation pathways, revealing unique patterns distinct from other mammals. These findings clarify pig cardiac electrophysiology and its differences from carnivores and primates.

    Area of Science:

    • Veterinary Cardiology
    • Cardiac Electrophysiology
    • Comparative Mammalian Anatomy

    Background:

    • Surface electrocardiogram (ECG) patterns in pigs differ from carnivores and ungulates.
    • Ventricular activation pathways significantly influence the surface ECG.
    • Understanding these pathways is crucial for interpreting pig cardiac function.

    Purpose of the Study:

    • To elucidate the specific pathways of ventricular activation in pigs.
    • To compare pig ventricular activation with that of other mammalian groups.

    Main Methods:

    • Anesthetized pigs underwent hemithoracotomy for cardiac exposure.
    • Epicardial and intramural electrograms were recorded using button and plunge electrodes.
    • Simultaneous Z-axis ECGs were recorded for precise timing relative to QRS onset.

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    Main Results:

    • Initial septal activation (0-10 ms) proceeds left-to-right.
    • Epicardial activation spreads from cranial right and caudal left ventricles towards the septum (10-50 ms).
    • Late septal activation (50-80 ms) occurs in an apical-basilar direction; endocardial-to-epicardial activation observed in ventricular free walls.

    Conclusions:

    • Pig ventricular activation pathways exhibit unique characteristics.
    • These pathways are attributed to extensive Purkinje fiber penetration, similar to ungulates but unlike carnivores and primates.
    • Findings provide insights into species-specific cardiac electrophysiology.