The metabolic syndrome and cardiovascular risk in the British Regional Heart Study
1Department of Primary Care and Population Science, Royal Free and University College Medical School, London, UK. goya@pcps.ucl.ac.uk
Insights
The metabolic syndrome significantly increases risks for cardiovascular disease (CVD) and type 2 diabetes in middle-aged men. While not superior to the Framingham Risk Score for CVD prediction, it better identifies individuals at high risk for diabetes, warranting lifestyle interventions.
Area of Science:
- Cardiovascular epidemiology
- Metabolic health
- Risk prediction modeling
Background:
- Metabolic syndrome is a cluster of conditions increasing cardiovascular disease (CVD) and diabetes risk.
- Accurate risk assessment is crucial for preventative strategies in middle-aged populations.
Purpose of the Study:
- To assess the utility of the metabolic syndrome as a risk prediction tool for CVD and type 2 diabetes in middle-aged British men.
- To compare its predictive performance against the established Framingham Risk Score.
Main Methods:
- A prospective study involving 5128 men aged 40-59 years without prior CVD or diabetes.
- Follow-up duration of 20 years to record incident CVD and type 2 diabetes events.
Main Results:
- Metabolic syndrome significantly elevated risks for coronary heart disease (CHD), stroke, and type 2 diabetes.
- It was a stronger predictor of diabetes (AUC 0.70) than CHD/CVD (AUC 0.58), outperforming the Framingham Risk Score for diabetes prediction.
- Men with 3 or more metabolic abnormalities faced a substantial absolute risk (41.8%-50%+) of developing CVD or diabetes over 20 years.
Conclusions:
- Metabolic syndrome, while disappointing for improving CHD risk prediction, effectively identifies high-risk individuals for both diabetes and CVD.
- These individuals may benefit significantly from targeted lifestyle interventions to mitigate risks.
Objective:
To evaluate the metabolic syndrome as an overall risk assessment tool for cardiovascular disease (CVD) and diabetes in middle-aged British men.
Design:
Prospective study.
Subjects:
A total of 5128 men aged 40-59 years with no history of CVD or diabetes drawn from general practices in 24 British towns and followed up for 20 years.
Results:
The metabolic syndrome (National Cholesterol Expert Panel definition) is associated with a significant increase in risk of total CHD (myocardial infarction, angina or CHD death) (relative risk (RR), 95% CI: 1.57, 1.39-1.97), stroke (1.61, 95% CI: 1.26-2.06) and type 2 diabetes (3.57, 95% CI: 2.83-4.50) and is a far stronger predictor of diabetes than of total CHD and stroke in middle-aged men. The metabolic syndrome was inferior to the Framingham Risk Score in predicting total CHD or major CVD over 20 years (area under the curve (AUC) 0.58 vs 0.66 for both CHD and CVD; P<0.0001 for difference) but was superior in predicting diabetes (AUC 0.70 vs 0.60; P<0.001). However, absolute risk of developing CVD or diabetes over 20 years in those with three or more abnormalities was very high, ranging from 41.8% in those with three abnormalities to over a 50% chance in those with four of five abnormalities, comparable to the absolute incidence rates in the top 2 fifths of the Framingham distribution.
Conclusion:
While the initial aim to use the metabolic syndrome to improve risk prediction of CHD has been disappointing, the syndrome identifies patients at high risk of both diabetes and CVD who may derive benefit from lifestyle intervention.
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