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Published on: November 10, 2017
Blood lipids and first-ever ischemic stroke/transient ischemic attack in the Bezafibrate Infarction Prevention (BIP)
D Tanne1, N Koren-Morag, E Graff
1Department of Neurology, Stroke Unit, Chaim Sheba Medical Center, Tel Hashomer, Israel. tanne@post.tau.ac.il
Insights
High triglycerides increase ischemic stroke risk, while higher HDL cholesterol protects patients with coronary heart disease. These blood lipids are modifiable stroke risk factors.
Area of Science:
- Cardiovascular Medicine
- Neurology
- Lipid Metabolism
Background:
- Unclear links between blood lipids and stroke risk.
- Lipid-modifying agents show stroke risk reduction in coronary heart disease (CHD) patients.
Purpose of the Study:
- Investigate the association between blood lipids and ischemic stroke/transient ischemic attack (TIA) risk in patients with CHD.
Main Methods:
- Followed 11,177 patients with CHD without prior stroke/TIA.
- Assessed baseline medical history and blood lipids.
- Analyzed incidence of ischemic stroke/TIA over 6-8 years using logistic regression.
Main Results:
- Higher triglycerides (>200 mg/dL) correlated with increased ischemic stroke/TIA risk (OR 1.27).
- Lower high-density lipoprotein (HDL) cholesterol and %HDL were associated with higher risk.
- High triglycerides posed a risk across various patient subgroups.
Conclusions:
- Elevated triglycerides are an independent risk factor for ischemic stroke/TIA.
- Higher %HDL is an independent protective factor against stroke/TIA in CHD patients.
- Blood lipids, particularly triglycerides, are important modifiable stroke risk factors.
Background:
Despite unclear associations between blood lipids, including fractionated cholesterol and triglycerides, and stroke, recent evidence demonstrates that lipid-modifying agents decrease the risk of stroke in patients with coronary heart disease (CHD).
Methods And Results:
Patients with documented CHD who were screened for but not included in the Bezafibrate Infarction Prevention study and had no history of stroke or transient ischemic attack (TIA) (n=11 177) were followed up. At baseline, medical histories were obtained and blood lipids assessed at a central study laboratory. During a 6- to 8-year follow-up period, 941 patients were identified as having nonhemorrhagic cerebrovascular disease, of whom 487 had verified ischemic stroke (per clinical findings and brain CT) or TIA. Patients experiencing an ischemic stroke/TIA had higher mean levels of triglycerides, lower levels of HDL cholesterol, and lower percentages of cholesterol contained in the HDL cholesterol moiety (%HDL; P<0.01 for all). In a logistic regression model, the adjusted ORs for developing an ischemic stroke/TIA were 1.27 (95% CI 1.01 to 1.60) associated with triglycerides >200 mg/dL and 0.87 (95% CI 0.78 to 0.97) associated with a 5% decrease in %HDL. The increased risk associated with high triglycerides was found across subgroups of age, sex, patient characteristics, and cholesterol fractions.
Conclusions:
High triglycerides constitute an independent risk factor for ischemic stroke/TIA across subgroups of age, sex, patient characteristics, and cholesterol fractions, whereas high %HDL was an independent protective factor among patients with CHD. These findings support the role of blood lipids, including triglycerides, as important modifiable stroke risk factors.
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