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Syncope in hypertrophic cardiomyopathy: mechanisms and consequences for treatment

Lynne Williams1, Michael Frenneaux

  • 1Department of Cardiovascular Medicine, University of Birmingham, Edgbaston, Birmingham, West Midlands, UK. l.k.williams@bham.ac.uk

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|May 25, 2007
PubMed

Insights

Hypertrophic cardiomyopathy (HCM) causes impaired consciousness like syncope in 15-25% of patients. Recurrent syncope in young individuals signals higher sudden death risk, necessitating investigation for treatable causes.

Area of Science:

  • Cardiology
  • Genetics
  • Neurology

Background:

  • Hypertrophic cardiomyopathy (HCM) is an inherited cardiac condition.
  • HCM presents with significant phenotypic variability.
  • Impaired consciousness, including syncope, affects 15-25% of HCM patients.

Purpose of the Study:

  • To investigate the mechanisms of syncope in hypertrophic cardiomyopathy.
  • To assess the association between syncope and sudden death risk in young HCM patients.
  • To emphasize the importance of excluding treatable causes of syncope in HCM.

Main Methods:

  • Review of patient data for hypertrophic cardiomyopathy.
  • Analysis of syncope and pre-syncope occurrences.
  • Detailed investigation of potential underlying mechanisms for syncope.

Main Results:

  • Recurrent syncope in young HCM patients is linked to increased sudden death risk.
  • Identified probable mechanisms (e.g., arrhythmias) in a minority of cases.
  • The majority of syncope cases in HCM remain unexplained despite thorough investigation.

Conclusions:

  • Syncope is a significant symptom in hypertrophic cardiomyopathy with potential links to adverse outcomes.
  • While arrhythmias are sometimes implicated, the cause of syncope is often unclear in HCM.
  • Excluding treatable causes of syncope is crucial for managing patients with hypertrophic cardiomyopathy.

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