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Hypertrophic cardiomyopathy complicated by severe bradycardias: a pedigree report

Dao Wen Wang1, You Bin Deng

  • 1Department of Internal Medicine, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China. dwwang@tjh.tjmu.edu.cn

Clinical Cardiology
|February 14, 2002
PubMed

Insights

This study details a Chinese family with nonobstructive hypertrophic cardiomyopathy (HCM). The unusual form of HCM presented with severe bradycardia and conduction block, suggesting a potential new gene mutation.

Area of Science:

  • Cardiology
  • Genetics
  • Internal Medicine

Background:

  • Hypertrophic cardiomyopathy (HCM) is a primary heart muscle disease.
  • Nonobstructive HCM can present with varied clinical manifestations.

Observation:

  • Four patients from an extended Chinese family presented with similar physical and echocardiographic findings.
  • Key observations included harsh localized systolic murmurs and apical left ventricular hypertrophy.
  • Severe sinus bradycardia and atrial-ventricular conduction block (AVB) led to recurrent syncope in all patients.

Findings:

  • Two patients experienced sudden cardiac death attributed to bradycardia.
  • Holter monitoring revealed no tachyarrhythmias, and late potentials were absent.
  • This distinct clinical presentation suggests a novel genetic etiology for this form of HCM.

Implications:

  • The findings highlight a unique familial form of nonobstructive HCM.
  • Further research is warranted to identify the specific gene mutation responsible.
  • Understanding this genetic basis could inform future diagnostic and therapeutic strategies for HCM.

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