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Related Experiment Videos

Regional differences in the electrical activity of the rabbit sinus node.

I Kodama, M R Boyett

Pflugers Archiv : European Journal of Physiology

|July 1, 1985

Summary

Regional differences in rabbit sinus node membrane properties were investigated. Peripheral sinus node tissue exhibits faster electrical activity and recovery, while central tissue shows slower activity and greater depression, explaining pacemaker shifts.

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Area of Science:

Cardiovascular Physiology
Cardiac Electrophysiology

Background:

The sinus node initiates the heart's electrical impulse.
Regional differences in sinus node function are not fully understood.

Purpose of the Study:

To investigate regional variations in membrane properties and electrical activity within the rabbit sinus node.
To correlate these regional differences with pacemaker behavior.

Main Methods:

Excised rabbit sinus node tissue specimens (approx. 0.3 mm diameter) from central, transitional, and peripheral regions were studied.
Electrical activity, action potential characteristics, and responses to stimulation, K+ concentration, and acetylcholine were measured.

Main Results:

Peripheral sinus node tissue showed significantly greater action potential upstroke velocity and overshoot.

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Central sinus node tissue exhibited slower spontaneous activity and recovery of excitability.

Central sinus node tissue was most affected by overdrive stimulation and high K+ concentration, and least sensitive to acetylcholine.

Conclusions:

Significant regional differences in electrical properties exist within the sinus node.
These regional heterogeneities likely contribute to dynamic pacemaker shifts observed in the intact heart.