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The etiology and natural history of sinus node disorders
Insights
This study clarifies the natural history of sick sinus syndrome (SSS), identifying degenerative fibrosis as the primary cause, not coronary artery disease. Understanding SSS progression aids in managing sinus node disorders.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Sinus node disorders, particularly sick sinus syndrome (SSS), present complex etiological and natural history challenges.
- Normal sinoatrial (S-A) nodal function involves multifaceted influences that are crucial for understanding SSS.
Purpose of the Study:
- To emphasize and clarify the etiology of sinus node disorders.
- To detail the natural history and progressive phases of sick sinus syndrome (SSS).
Main Methods:
- Review of multifaceted influences on normal S-A nodal function.
- Analysis of the commonest abnormalities and etiological factors in SSS.
- Construction of the progressive natural history framework of SSS.
Main Results:
- Degenerative fibrosis is identified as the most frequent abnormality in SSS.
- Coronary artery disease is not a primary cause of sick sinus syndrome.
- The sequential phases of SSS progression are becoming clearer, though not all features appear in every patient.
Conclusions:
- The natural history of sick sinus syndrome (SSS) can now be structured into progressive phases.
- Degenerative fibrosis is the leading cause of SSS, distinct from coronary artery disease.
- New data on rescue rhythms and pacing in SSS management are presented.
Abstract:
Two aspects of sinus node disorders currently seem to need emphasis--the etiology, which is still a difficult area, and the detailed structuring of the natural history of the sick sinus syndrome (SSS). The latter is becoming much clearer. The multifaceted influences of normal S-A nodal functions are reviewed. Degenerative fibrosis is the commonest abnormality, and coronary artery disease is not a major cause of the syndrome. The framework of the progressive natural history of the SSS in its usual sequential phases can now be constructed. Of course, not every feature of this progression is perceived in each patient. Gradually developing stages are reviewed, new data concerning behavior of rescue rhythms in S-A node disorders are presented, and a brief comment concerning the needs for and complications of pacing is included.