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The impact of low-density lipoprotein cholesterol (LDL-C) on the risk of different types of strokes is unclear. Therefore, we systematically evaluated the impact of LDL-C levels (cohort studies) and lipid lowering drugs (LLAs, randomized controlled trials) on the different types of stroke.    Material and methods  PubMed, SCOPUS, Web of Science and Google Scholar were searched up to 1st December 2019.    Results  Participants at highest category of LDL-C had a lower risk for of hemorrhagic stroke (RR: 0.91, 95%CI 0.85-0.98, I2:0%) compared with the lowest category of LDL-C. Subjects with the highest category of LDL-C had a higher risk of ischemic stroke (RR: 1.11, 95%CI 1.07-1.14, I2:0%) compared to the lowest LDL-C category. LLAs decreased the risk of all types of strokes for those who achieved LDL-C&lt;1.8 mmol/L (&lt;70 mg/dL; RR=0.88, 95% CI 0.80-0.96, absolute risk reduction [ARR]: 0.7 %, number needed to treat (NNT): 143, I2:53%, n=13). Statin therapy decreased the risk of all strokes (RR=0.88, 95% CI 0.80-0.97, ARR: 0.6 %, NNT: 167, I2:56%). With regard to ischemic stroke only, LLAs decreased the risk of ischemic stroke for those who achieved LDL-C &lt;1.8 mmol/L (&lt;70 mg/dL; RR=0.75, 95%CI:0.67-0.83, ARR: 1.3%, NNT: 77, I2:0%); the same was observed for statins (RR= 0.76, 95%CI:0.69-0.84, ARR: 1.3%, NNT: 77, I2:32%). TSA indicated that both benefit boundaries and optimal sample size was reached.    Conclusions  Our study sheds light on the debatable association between low LDL-C and different type of strokes. This information can help determine the optimal LDL-C range for stroke prevention, and help plan future LLAs studies.

archives of medical science/archives of medical science (online)

Relationship between Low-Density Lipoprotein Cholesterol, Lipid Lowering Agents and the Risk of Stroke: A meta-analysis of Observational studies (n=355,591) and Randomized Controlled Trials (n=165,988).