Abstract
Background: Low lipid level is associated with better cardiovascular outcome. However, lipid paradox indicating low lipid level having worse outcomes could be seen under acute injury in some diseases. The present study was designed to clarify the prognostic significance of acute-phase lipid levels within 1 day after admission for stroke on mortality in first-ever statin-naïve acute ischemic stroke (IS) and hemorrhagic stroke (HS).Methods: This observational study was conducted using the data collected from Stroke Registry In Chang-Gung Healthcare System (SRICHS) between 2009 and 2012. Patients with recurrent stroke, onset of symptoms >1 day, and history of the use of lipid-lowering agents prior to index stroke were excluded. Stroke was classified into IS and hypertension-related HS. The primary outcomes were 30-day and 1-year mortality identified by linkage to national death registry for date and cause of death. Receiver operating characteristic (ROC) curve analysis and multivariate Cox proportional hazard models were used to examine the association of lipid profiles on admission with mortality.Results: Among the 18,268 admitted stroke patients, 3,746 IS and 465 HS patients were eligible for analysis. In IS, total cholesterol (TC) <163.5 mg/dL, triglyceride (TG) <94.5 mg/dL, low-density lipoprotein (LDL) <100 mg/dL, non-high-density lipoprotein cholesterol (non-HDL-C) <130.5 mg/dL, and TC/HDL ratio <4.06 had significantly higher risk for 30-day/1-year mortality with hazard ratio (HR) of 2.05/1.37, 1.65/1.31, 1.68/1.38, 1.80/1.41, and 1.58/1.38, respectively, compared with high TC, TG, LDL, non-HDL-C, and TC/HDL ratio (p < 0.01 in all cases). In HS, lipid profiles were not associated with mortality, except HDL for 30-day mortality (p = 0.025) and high uric acid (UA) concentrations for 30-day and 1-year mortality (p = 0.002 and 0.012, respectively). High fasting glucose and high National Institute of Health Stroke Scale (NIHSS) score at admission were associated with higher 30-day and 1-year mortality in both IS and HS and low blood pressure only in IS (p < 0.05). Synergic effects on mortality were found when low lipids were incorporated with high fasting glucose, low blood pressure, and high NIHSS score in IS (p < 0.05).Conclusions: Lipid paradox showing low acute-phase lipid levels with high mortality could be seen in statin-naïve acute IS but not in HS. The mortality in IS was increased when low lipids were incorporated with high fasting glucose, low blood pressure, and high NIHSS score.
Highlights
The concept of “the lower the cholesterol, the better the outcome” is suggested for the prevention of cardiovascular events [1]; there is inconsistent or weak association in the metabolic significance of lipids with stroke
Among the 18,268 stroke patients in the Stroke Registry In Chang-Gung Healthcare System (SRICHS) database for the study period, we excluded those with recurrent stroke (n = 7,716), age ≤ 40 years [544], stroke onset >1 day [3,356], known/uncertain history of the use of lipid-lowering agents [3,550], transient ischemic attack coded as ischemic stroke (IS) [238], secondary hemorrhagic stroke (HS) [564], and blood biochemistry tests undertaken 24 h after admission (IS = 287, HS = 249)
No diabetes, or no atrial fibrillation had higher frequency of low lipid levels (Supplemental Table 2), these risk factors were included for adjustment in multivariate Cox proportional hazard model
Summary
The concept of “the lower the cholesterol, the better the outcome” is suggested for the prevention of cardiovascular events [1]; there is inconsistent or weak association in the metabolic significance of lipids with stroke. A recent community study in Japan found that high-density lipoprotein (HDL) levels had an inverse relationship with the incidence of lacunar infarction but a positive association with the risk of hemorrhagic stroke (HS), mainly in women [11]. Lipid levels may be different between HS patients and non-HS controls, but a decline in serum TC and low-density lipoprotein (LDL) levels can be found within 6 months prior to primary HS, independent of statin treatment [12]. These alterations in serum lipid trends may suggest a biological pathway to induce HS occurrence. The present study was designed to clarify the prognostic significance of acute-phase lipid levels within 1 day after admission for stroke on mortality in first-ever statin-naïve acute ischemic stroke (IS) and hemorrhagic stroke (HS)
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