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Sick sinus syndrome: strategies for reducing mortality.
J Cosín1, A Hernandiz, J Solaz
1Centro de investigación, Hospital La Fe, Valencia, Spain.
Cor Et Vasa
|January 1, 1992
Summary
Sick sinus syndrome (SSS) management impacts mortality. Atrial pacing (AAI) reduces death rates by preventing arrhythmias and embolism, while dual chamber pacing (DDD) is preferred for complex cases.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Sick sinus syndrome (SSS) presents with slow, intermittent symptoms and conduction disturbances.
- While overall mortality is slightly elevated compared to the general population, it is influenced by comorbidities, heart failure, and thromboembolism.
- Previous pacing strategies, like ventricular pacing (VVI), have not demonstrated mortality benefits.
Purpose of the Study:
- To evaluate the impact of different pacemaker pacing modes on mortality in patients with sick sinus syndrome.
- To compare the efficacy of atrial pacing (AAI) and dual chamber pacing (DDD) versus ventricular pacing (VVI) and no pacing.
- To identify optimal pacing strategies for preventing complications such as atrial fibrillation, systemic embolism, and stroke.
Main Methods:
- Retrospective analysis of patient data comparing outcomes across different pacing modalities (VVI, AAI, DDD).
- Assessment of mortality rates, incidence of atrial fibrillation, systemic embolism, and stroke.
- Evaluation of anticoagulant therapy (warfarin, aspirin) in non-paced or VVI-paced patients.
Main Results:
- Ventricular pacing (VVI) did not reduce mortality.
- Atrial pacing (AAI) demonstrated reduced mortality, attributed to electrical stability of the atria, prevention of fibrillation, and preservation of atrial function.
- Dual chamber pacing (DDD) is recommended for patients with atrioventricular conduction disturbances or atrial fibrillation, ensuring continuous ventricular support.
- Anticoagulation with warfarin or aspirin can prevent embolic events in specific patient groups.
Conclusions:
- Atrial pacing (AAI) offers significant survival benefits in sick sinus syndrome by stabilizing atrial electrical activity and preventing emboli.
- Dual chamber pacing (DDD) provides a superior therapeutic option for complex SSS cases involving conduction blocks or atrial arrhythmias.
- Appropriate pacemaker selection and consideration of anticoagulation are crucial for improving outcomes and reducing mortality in sick sinus syndrome patients.
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