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The terminal crest: morphological features relevant to electrophysiology
D Sánchez-Quintana1, R H Anderson, J A Cabrera
1Universidad de Extremadura, Departamento de Anatomía Humana, Facultad de Medicina, Badajoz, Spain.
Heart (British Cardiac Society)
|September 17, 2002
Summary
The normal anatomy of the terminal crest and its junctional regions reveals non-uniform muscle fiber arrangements, crucial for understanding atrial arrhythmias and guiding ablation strategies.
Area of Science:
- Cardiac Anatomy
- Histology
- Electrophysiology
Background:
- The terminal crest (crista terminalis) is a key anatomical structure in the right atrium.
- Understanding its detailed anatomy is vital for diagnosing and treating atrial arrhythmias.
Purpose of the Study:
- To detail the anatomy of the terminal crest and its junctional regions.
- To establish a baseline for structural normality in these cardiac areas.
- To correlate anatomical findings with potential arrhythmogenic properties.
Main Methods:
- Study of 97 human necropsy hearts without prior atrial arrhythmia history.
- Measurement of terminal crest dimensions (width, thickness) at specific ablation sites.
- Light and scanning electron microscopy to analyze fine structure and myofiber arrangement.
Main Results:
- Pectinate muscles showed non-uniform trabecular patterns in 80% of hearts.
- Terminal crest fine structure revealed age-related changes in fibrous sheaths.
- Myocardial fibers in the terminal crest were mostly longitudinal, but junctional areas exhibited crossing, non-uniform architecture.
Conclusions:
- The normal anatomy of the terminal crest and its junctional areas promotes non-uniform anisotropic properties.
- These anatomical findings provide a basis for understanding the structural determinants of atrial arrhythmias.