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Cardioinhibitory carotid sinus hypersensitivity. Intracardiac recordings and clinical assessment
Insights
Cardioinhibitory carotid sinus hypersensitivity, common in elderly men, can cause syncope. Pacing may not be needed if electrophysiology studies are normal.
Area of Science:
- Cardiology
- Electrophysiology
- Geriatrics
Background:
- Cardioinhibitory carotid sinus hypersensitivity (CCSH) is a common cause of syncope, particularly in elderly men.
- CCSH is characterized by an exaggerated vasovagal response to carotid sinus stimulation.
- Associated conditions like sinus bradycardia and aortic stenosis may be prevalent in affected individuals.
Purpose of the Study:
- To describe the clinical characteristics and electrophysiologic findings in elderly men with CCSH.
- To evaluate the diagnostic utility of His bundle electrocardiography in these patients.
- To determine the indications for permanent pacing in managing syncope due to CCSH.
Main Methods:
- Retrospective analysis of patients diagnosed with CCSH.
- Clinical data review including patient demographics, presenting symptoms, and comorbidities.
- Electrophysiologic studies, including His bundle electrocardiography and carotid sinus massage.
- Assessment of response to interventions and long-term outcomes.
Main Results:
- CCSH predominantly affects elderly men, often triggered by right carotid massage.
- Ventricular asystole can occur abruptly, preceded by sinoatrial and atrioventricular nodal conduction delays.
- His bundle electrocardiography aids in excluding other syncope etiologies.
- Gradual recovery of sinus node function and atrioventricular nodal conduction is observed after asystole.
Conclusions:
- Elderly men with CCSH may present with specific electrophysiologic abnormalities.
- His bundle electrocardiography is a valuable tool for differential diagnosis in syncope.
- Permanent pacing is not always indicated for CCSH, especially with normal electrophysiologic study results.
Abstract:
Cardioinhibitory carotid sinus hypersensitivity most frequently occurs in elderly men, predominantly during right carotid massage. Resting sinus bradycardia and aortic stenosis may be unusually prevalent in this subgroup of patients. Ventricular arrest occurs abruptly and may be preceded by brief prolongation of sinus cycle lengths and atrioventricular nodal conduction times. Gradual recovery of the sinoatrial rate follows resumption of sinus rhythm and is preceded by atrioventricular nodal recovery. His bundle electrocardiography is valuable in excluding other potential causes of syncope in patients with carotid sinus hypersensitivity. Despite a history of syncope, permanent pacing may not be indicated in the management of patients with carotid sinus hypersensitivity and otherwise normal electrophysiologic study.