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Non-high-density lipoprotein cholesterol on the risks of stroke: a result from the Kailuan study
Jianwei Wu1, Shengyun Chen, Yong Zhou
1Department of Neurology, Beijing TianTan Hospital, Capital Medical University, Beijing, China.
Insights
Elevated non-high-density lipoprotein cholesterol (non-HDLC) is a significant risk factor for stroke. Higher non-HDLC levels increase the likelihood of total and ischemic stroke, but not hemorrhagic types.
Area of Science:
- Cardiovascular Epidemiology
- Lipid Metabolism
- Cerebrovascular Disease
Background:
- Non-high-density lipoprotein cholesterol (non-HDLC) is increasingly recognized as a key lipid marker.
- Understanding the association between non-HDLC and stroke subtypes is crucial for risk stratification.
Purpose of the Study:
- To prospectively investigate the relationship between serum non-HDLC levels and the incidence of stroke and its subtypes.
- To determine if non-HDLC is an independent risk factor for different types of stroke.
Main Methods:
- A cohort of 95,916 Chinese adults without prior cardiovascular events was followed for four years.
- Serum non-HDLC was calculated by subtracting high-density lipoprotein cholesterol (HDLC) from total cholesterol.
- Cox proportional hazards models were employed to assess the risk of stroke and its subtypes.
Main Results:
- A total of 1614 stroke events were recorded, including ischemic stroke, intracerebral hemorrhage, and subarachnoid hemorrhage.
- Increased non-HDLC levels were associated with a higher risk of total stroke (HR 1.08 per 20 mg/dL) and ischemic stroke (HR 1.10 per 20 mg/dL).
- The highest quintiles of non-HDLC showed significantly elevated risks for total and ischemic stroke after adjusting for confounders.
Conclusions:
- Serum non-HDLC is an independent risk factor for both total and ischemic stroke.
- Higher concentrations of non-HDLC are linked to increased risks of total and ischemic stroke.
- Non-HDLC levels did not show a significant association with the risk of intracerebral or subarachnoid hemorrhage.
Aims:
To prospectively explore the association between non-high-density lipoprotein cholesterol (non-HDLC) and the risks of stroke and its subtypes.
Methods:
A total of 95,916 participants (18-98 years old; 76,354 men and 19,562 women) from a Chinese urban community who were free of myocardial infarction and stroke at baseline time point (2006-2007) were eligible and enrolled in the study. The serum non-HDLC levels of participants were determined by subtracting the high-density lipoprotein cholesterol (HDLC) from total serum cholesterol. The primary outcome was the first occurrence of stroke, which was diagnosed according to the World Health Organization criteria and classified into three subtypes: ischemic stroke, intracerebral hemorrhage, or subarachnoid hemorrhage. The Cox proportional hazards models were used to estimate risk of stroke and its subtypes.
Results:
During the four-year follow-up, we identified 1614 stroke events (1,156 ischemic, 416 intracerebral hemorrhagic and 42 subarachnoid hemorrhagic). Statistical analyses showed that hazard ratios (HR) (95% Confidence Interval: CI) of serum Non-HDLC level for total and subtypes of stroke were: 1.08 (1.03-1.12) (total), 1.10 (1.05-1.16) (ischemic), 1.03 (0.96-1.10) (intracerebral hemorrhage) and 0.83 (0.66-1.05) (subarachnoid hemorrhage). HR for non-HDLC refers to the increase per each 20 mg/dl. For total and ischemic stroke, the risks were significantly higher in the fourth and fifth quintiles of non-HDLC concentrations compared to the first quintile after adjusting the confounding factors (total stroke: 4(th) quintile HR=1.33 (1.12-1.59); 5(th) quintile HR = 1.36 (1.15-1.62); ischemic stroke: 4(th) quintile HR =1.34 (1.09-1.66); 5(th) quintile HR = 1.53 (1.24-1.88)).
Conclusions:
Our data suggest that serum non-HDLC level is an independent risk factor for total and ischemic stroke, and that higher serum non-HDLC concentrations are associated with increased risks for total stroke and ischemic stroke, but not for intracerebral and subarachnoid hemorrhage.
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