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Quantification of fiber orientation in the canine atrial pacemaker complex using optical coherence tomography
Christina M Ambrosi1, Vadim V Fedorov, Richard B Schuessler
1Washington University, Department of Biomedical Engineering, 1 Brookings Drive, Campus Box 1097, St. Louis, Missouri 63130, USA.
Journal of Biomedical Optics
|August 17, 2012
Summary
Optical coherence tomography (OCT) reveals unique cardiac fiber patterns in the sinoatrial node (SAN) and surrounding atrial tissue. This imaging technique helps identify structural differences crucial for understanding normal and abnormal heart rhythms.
Area of Science:
- Cardiovascular Research
- Biomedical Imaging
- Cardiac Electrophysiology
Background:
- The atrial pacemaker complex initiates cardiac impulses.
- Understanding its structure is key to cardiac conduction.
- Optical coherence tomography (OCT) offers high-resolution imaging of cardiac tissue.
Purpose of the Study:
- To characterize fiber orientation patterns in the sinoatrial node (SAN) and surrounding atrial structures using OCT.
- To compare OCT findings with histological sections for validation.
- To identify unique structural patterns related to cardiac conduction.
Main Methods:
- Functionally characterized canine SAN (n=7) were imaged using OCT.
- OCT imaging penetrated up to 1 mm below the endocardial surface.
- OCT images were directly compared to corresponding histological sections.
Main Results:
- Unique fiber orientation patterns were identified in the crista terminalis (CT), SAN, and atrial myocardium.
- The SAN showed significantly greater fiber disarray (33 ± 7 deg) compared to the CT (18 ± 3 deg) and atrium (23 ± 5 deg).
- Local fiber orientation patterns specific to the block zone were also identified.
Conclusions:
- OCT can detect structural components of the atrial pacemaker complex.
- Fiber orientation patterns differ significantly between the SAN, CT, and surrounding atrial myocardium.
- These structural insights are relevant for understanding normal and abnormal cardiac conduction.
