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[Clinical and metabolic aspects of juvenile myocardial infarct]
Insights
Young patients experiencing myocardial infarction often have familial hyperbetalipoproteinaemia. Both reduced glucose tolerance and high cholesterol are independent risk factors for coronary heart disease in this demographic.
Area of Science:
- Cardiology
- Metabolic Disorders
- Genetics
Context:
- Investigates early-onset myocardial infarction (MI) in patients under 40.
- Examines clinical and metabolic profiles of 61 young MI patients.
- Highlights a high prevalence of familial involvement and specific lipid disorders.
Purpose:
- To identify clinical and metabolic factors associated with premature myocardial infarction.
- To explore the relationship between lipid profiles, glucose metabolism, and early-onset coronary artery disease.
- To assess the frequency of familial hyperbetalipoproteinaemia in young MI patients.
Summary:
- Study found familial hyperbetalipoproteinaemia (types IIA and IIB) common in young MI patients.
- Reduced glucose tolerance and high cholesterol levels identified as independent risk factors.
- Insulin resistance was suggested by impaired oral glucose tolerance tests.
- Excess weight and hypertension were infrequent; premonitory angina was rare.
Impact:
- Provides insights into distinct risk factor profiles for early-onset coronary artery disease.
- Suggests genetic lipid disorders and metabolic derangements are key contributors.
- Emphasizes the need for early screening of lipid and glucose metabolism in young individuals with a family history of heart disease.
Abstract:
A clinical and metabolic study of 61 patients with myoocardial infarct before the age of 40 yr showed a high frequency of familial involvement, particularly in subjects with type IIA and IIB hyperbetalipoproteinaemia. Excess weight and arterial hypertension were rare, while premonitory angina was absent in 59%. Four subjects were diabetic. Oral glucose tolerance was normal in 14 and of diabetic type in 26 of 40 patients examined; the insulin response pointed to insulin-resistance. Dyslipidaemia was noted in 45%, including type IIA and IIB hyperbetalipoproteinaemia in 27%. Distribution of the frequency of infarct in function of cholesterolaemia classes gave a bimodal curve indicative of distinct normo- and hypercholesterolaemic groups within the series. Reduced glucose tolerance was more frequent in patients with low blood cholesterol. This suggests that reduced tolerance and high blood cholesterol are independent risk factors in coronary disease. No relation between the clinical and metabolic data could be ascertained.