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Maximal exercise stress testing in normal and hyperlipidemic children
Insights
Maximal exercise electrocardiography showed higher rates of ST depression in children with familial hyperlipoproteinemia, particularly boys. However, this finding is not yet a reliable indicator of future coronary artery disease in these young patients.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Disease
- Genetics and Inherited Conditions
Background:
- Familial hyperlipoproteinemia (FHL) is an inherited condition characterized by high cholesterol levels.
- Early detection of cardiovascular risk factors in children with FHL is crucial for long-term health.
- Exercise electrocardiography (ECG) is a common non-invasive test to assess cardiac function during physical stress.
Purpose of the Study:
- To evaluate electrocardiographic and cardiovascular responses during maximal exercise in children with and without familial hyperlipoproteinemia.
- To determine if exercise ECG abnormalities can predict future coronary artery disease in asymptomatic hyperlipidemic children.
Main Methods:
- Maximal exercise testing was performed on 103 normal children and 82 children with familial hyperlipoproteinemia.
- Electrocardiographic (ECG) and cardiovascular parameters were recorded during exercise.
- Comparison of exercise ECG findings, specifically segmental ST depression, between hyperlipidemic and normal children.
Main Results:
- Children with monogenic familial hyperlipoproteinemia exhibited a significantly higher incidence of segmental ST depression during maximal exercise compared to normal children (23% vs. 10.75%, P < 0.05).
- This difference was more pronounced in boys (27.6%) than in girls (19%) with familial hyperlipoproteinemia.
- Resting and exercise blood pressures, weight-height index, and maximal working capacity were comparable between groups.
Conclusions:
- While exercise-induced ST depression is more frequent in children with familial hyperlipoproteinemia, its clinical significance for predicting future coronary artery disease remains uncertain.
- Long-term follow-up studies spanning decades are necessary to correlate these ECG findings with actual coronary disease development.
- Current maximal exercise electrocardiography is not a definitive tool for identifying asymptomatic hyperlipidemic children at risk for premature coronary artery disease.
Abstract:
Electrocardiographic and cardiovascular responses during maximal exercise were evaluated in 103 normal children and in 82 children with familial hyperlipoproteinemia. The normal and hyperlipidemic children were comparable in regards to age, weight--height index, resting and exercise blood pressures, and maximal working capacity indices. The cohort of 82 hyperlipidemic children included 61 children (29 boys and 32 girls) with well defined "monogenic" familial hyperlipoproteinemia. Segmental ST depression on the exercise electrocardiogram occurred in 8 of these 29 boys (27.6%) as compared to 4 of 55 normal boys (7.3%), P less than 0.025 and in 6 of the 32 girls (19%) as compared to 7 of 48 normal girls (14.6%), P greater than 0.1. Segmental ST depression was present in 14 of 61 (23%) children with "monogenic" hyperlipoproteinemia, as compared to 11 of 103 (10.75%) normal (x2 = 4.47, P less than 0.05). An assessment of the clinical significance of an abnormal exercise electrocardiogram in male children with "monogenic" hyperlipoproteinemia must await the following: (1) two to four decades of observation and study of the development of morbid or mortal coronary disease, or (2) the future development of improved invasive or noninvasive techniques for the early detection of covert coronary occlusive disease. Currently, maximal exercise electrocardiography cannot be contemplated as a useful indicator of eventual premature coronary artery disease in asymptomatic hyperlipidemic children.