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Related Experiment Video

Updated: May 24, 2026

Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse

Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse

Published on: December 22, 2020

Structure-function relationship in the sinus and atrioventricular nodes.

T Nikolaidou¹, O V Aslanidi, H Zhang

¹Department of Biomedical Engineering, Washington University, Room 360, Whitaker Hall, One Brookings Drive, St. Louis, MO 63130, USA. nikolaidou@btinternet.com

Pediatric Cardiology

|March 7, 2012

Summary

This summary is machine-generated.

Optical mapping reveals distinct sinoatrial exit pathways in larger mammals, unlike the wave front activation seen in smaller animals. This highlights the complex 3D cardiac conduction system and informs future mathematical models.

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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

Area of Science:

Cardiovascular Physiology
Cardiac Electrophysiology
Comparative Anatomy

Background:

Previous studies in mice and rabbits described a wave front activation pattern.
Optical mapping in larger mammals reveals functionally discrete sinoatrial exit pathways.
This contrasts with findings in smaller mammals, suggesting species-specific differences in cardiac activation.

Purpose of the Study:

To investigate the three-dimensional (3D) organization of the cardiac pacemaking and conduction system in larger mammals.
To identify functionally discrete sinoatrial exit pathways and their relationship with anatomic and histologic features.
To understand how complex 3D organization influences excitation pathways and source-to-sink mismatch.

Main Methods:

Optical mapping studies in larger mammals (including humans).
Comparative analysis with previous mapping studies in dogs, humans, mice, and rabbits.
Consideration of mathematical modeling for studying cardiac electrophysiology.

Main Results:

Identification of functionally discrete sinoatrial exit pathways in larger mammals, aligning with studies in dogs and humans.
Demonstration of identifiable activation pathways in sinoatrial and atrioventricular nodes that coincide with anatomic landmarks.
Elucidation of how muscle fiber orientation, cell coupling, and 3D organization influence excitation pathways and increase source-to-sink mismatch.

Conclusions:

The cardiac pacemaking and conduction system in larger mammals exhibits complex 3D organization with distinct activation pathways.
Anatomic and histologic factors significantly determine excitation pathways.
Future mathematical models should incorporate these 3D structural factors for accurate simulation of large mammal cardiac physiology.