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Familial occurrence of coronary heart disease according to clinical manifestation
Insights
Coronary heart disease (CHD) is more common in siblings of affected individuals. Familial resemblance suggests genetic factors influence how CHD clinically manifests.
Area of Science:
- Cardiovascular Medicine
- Medical Genetics
- Epidemiology
Background:
- Coronary heart disease (CHD) encompasses various clinical presentations, including myocardial infarction (MI) and angina pectoris (AP).
- Understanding familial aggregation of CHD is crucial for identifying genetic predispositions and risk factors.
- Previous studies have indicated a familial component in CHD, but specific patterns of clinical manifestation require further investigation.
Purpose of the Study:
- To assess the occurrence of different clinical manifestations of CHD among relatives of men with CHD.
- To compare the prevalence of CHD and its specific forms in siblings of case probands versus control subjects.
- To investigate whether familial resemblance extends to the specific clinical expression of CHD.
Main Methods:
- A case-control study involving 309 men with CHD (case probands) and 106 reference men without CHD.
- CHD cases were categorized into fatal myocardial infarction (MI), nonfatal MI, and angina pectoris (AP).
- Family history of CHD and specific clinical manifestations were collected from parents and siblings of both case and reference probands.
Main Results:
- CHD was equally prevalent among relatives of all case probands compared to reference siblings.
- Brothers of case probands had four times the risk of CHD, and sisters had twice the risk compared to reference siblings.
- Specific CHD manifestations showed familial clustering: cardiac deaths were most common in siblings of men with fatal MI, while uncomplicated angina was prevalent in siblings of men with AP.
Conclusions:
- The study confirms a significant familial aggregation of coronary heart disease.
- Familial resemblance in specific clinical manifestations of CHD suggests a genetic influence on disease expression.
- These findings highlight the importance of family history in assessing CHD risk and understanding its diverse clinical phenotypes.
Abstract:
Occurrence of different clinical manifestations of coronary heart disease (CHD) was assessed among the parents and siblings of 309 men with CHD (case probands), including 103 men with fatal and 100 with nonfatal myocardial infarction (MI), and 106 men with angina pectoris (AP) and among the relatives of 106 reference men. CHD was equally common among relatives of all case probands. It was four times as common in case brothers and twice as common in case sisters as in the respective reference siblings. There were differences between the various case groups as to the predominant clinical manifestation of CHD. Cardiac deaths were commonest in the sibs of men with fatal MI, and uncomplicated angina in the men with AP. The familial resemblance in the clinical manifestations of CHD suggests familial influence in the mechanisms determining the clinical expression of the disease.