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Structural heart disease as the cause of syncope
R B Guimarães1, V Essebag2,3, M Furlanetto1
1Fundação Universitária de Cardiologia, Instituto de Cardiologia do Rio Grande do Sul, Porto Alegre, RS, Brasil.
Summary
Patients with structural heart disease experiencing syncope have a higher risk if the cause is cardiogenic. Differentiating syncope causes is crucial for better survival and fewer hospital readmissions.
Area of Science:
- Cardiology
- Clinical Medicine
- Emergency Medicine
Background:
- Syncope in patients with structural heart disease (SHD) presents a diagnostic challenge.
- Understanding syncope etiology is critical for prognostication in SHD patients.
Purpose of the Study:
- To describe the clinical evolution of syncope in patients with SHD.
- To investigate the relationship between syncope etiology and event-free survival.
- To evaluate the utility of existing syncope prognostication scores in this population.
Main Methods:
- Retrospective analysis of 160 patients with SHD presenting with syncope.
- Stratification by syncope etiology (vasovagal, cardiogenic, orthostatic hypotension, unknown).
- Cox proportional hazard models for survival analysis; AUC for score performance.
Main Results:
- Cardiogenic syncope (57%) had significantly higher 30-day composite endpoint rates (60.6%) compared to vasovagal syncope (39.4%).
- Cardiogenic syncope was associated with lower event-free survival (HR=2.97, P<0.001).
- Prognostication scores showed poor diagnostic performance (AUC analysis) in differentiating high-risk patients.
Conclusions:
- The etiology of syncope in SHD patients significantly impacts prognosis, with cardiogenic causes being more dangerous.
- Distinguishing between vasovagal/orthostatic hypotension and cardiogenic syncope is vital for patient management and outcomes.
- Current syncope prognostication scores are unreliable for SHD patients presenting to the emergency room.
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