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Familial occurrence of electrocardiographic abnormalities of the Brugada-type
T Kobayashi1, U Shintani, T Yamamoto
1Department of Internal Medicine, Tsu National Hospital, Hisai.
Insights
This study highlights a family with Brugada-type electrocardiographic abnormalities and conduction delays. Further research is needed to understand the genetic link between these cardiac conditions.
Area of Science:
- Cardiology
- Clinical Electrophysiology
- Genetics
Background:
- Brugada syndrome is a genetic disorder characterized by specific electrocardiogram (ECG) abnormalities and an increased risk of sudden cardiac death.
- Atrioventricular (AV) conduction disorders can manifest as prolonged intervals in the His-ventricle (HV) conduction time.
- Family history of heart disease and sudden death suggests a potential genetic predisposition.
Observation:
- A 51-year-old male presented with dizziness and complete right bundle branch block with a prolonged HV interval (100 msec).
- Three family members exhibited Brugada-type ECG patterns with persistent ST elevation and right bundle branch block, including one sudden death case.
- Signal-averaged ECG in children of sudden death victims revealed delayed HV intervals and positive late potentials.
Findings:
- The observed case demonstrates a co-occurrence of Brugada-type ECG abnormalities and significant atrioventricular conduction delay.
- Family screening identified multiple individuals with Brugada-type ECG patterns, suggesting a familial link.
- Late potential findings in at-risk children indicate potential underlying electrical instability.
Implications:
- These findings suggest a possible association between Brugada-type ECG abnormalities and atrioventricular conduction disorders within affected families.
- Further investigation into the genetic basis of this combined phenotype is warranted.
- Understanding this relationship may improve risk stratification and management strategies for individuals with Brugada syndrome and conduction abnormalities.
Abstract:
Electrocardiographic abnormalities were pointed out in a 51-year-old Japanese male whose major complaint was dizziness. His electrocardiogram showed a complete right bundle branch block, and a prolonged His bundle-ventricle (HV) interval of 100 msec. Two members of his family died of heart disease and 3 members, including a case of sudden death, presented an abnormal electrocardiogram of the Brugada-type with persistent ST segment elevation in the right precordial leads and right bundle branch block. The signal-averaged examination was made in the children of cases that died with the diagnosis of sudden death. Four cases showed a tendency of delay in the HV interval and a positive finding in the late potential. Further studies are necessary to clarify the relationship between electrocardiographic abnormalities of the Brugada-type and atrioventricular conduction disorder as well as to clarify the genetic basis of this disorder.