Low-density lipoprotein cholesterol (LDL-C) is a causal and modifiable risk factor for atherosclerotic cardiovascular disease, and intensive reduction of LDL-C is central to prevention strategies. Meta-analyses have shown that each 1 mmol/L (approximately 38.7 mg/dL) decrease in LDL-C confers about a 22% relative risk reduction in major vascular events, independent of baseline LDL-C levels. Despite the proven efficacy of statins and ezetimibe, many patients fail to reach recommended LDL-C targets due to inadequate response, intolerance, or poor adherence to daily therapy. The development of proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors has transformed lipid management, providing substantial LDL-C reduction. Recently, next-generation agents with extended dosing intervals have emerged, including recaticimab, a fully human monoclonal antibody, and inclisiran, a small interfering RNA therapy. Recaticimab binds circulating PCSK9, preventing degradation of the low-density lipoprotein receptor, and achieves sustained LDL-C reductions of about 50% with dosing every 8 to 12 weeks. Inclisiran employs N-acetylgalactosamine (GalNAc)-mediated hepatocyte delivery to silence PCSK9 messenger RNA, producing comparable LDL-C reductions with twice-yearly maintenance dosing after an initial loading dose. Their extended dosing schedules offer potential benefits in adherence and long-term lipid control, particularly for high-risk patients who struggle with frequent dosing or have statin intolerance. As outcome data accumulate, these therapies may further reduce residual atherosclerotic cardiovascular disease risk and become increasingly important in comprehensive prevention strategies.
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Background This study investigated potential differences in blood viscosity (BV) among patients with stroke of undetermined etiology, negative evaluation (SUDn), specifically those with potential atherothrombosis (SUDn-AT) and those with possible embolism (SUDn-E).
Methods This single-center study employed a retrospective observational design. The participants were patients over 20 years old with the SUDn stroke subtype who were admitted within 5 days of symptom onset. These patients were categorized as SUDn-AT or SUDn-E. Patients in the SUDn-AT group had nonsignificant stenosis (<50%) of a major brain artery relevant to their symptoms and exhibited one or more signs of systemic atherosclerosis, including atherosclerosis of at least one major brain artery other than those clinically relevant, coronary artery disease, and/or peripheral artery disease. For the SUDn-E group, the SUDn criteria from the TOAST (Trial of Org 10172 in Acute Stroke Treatment) classification system were strictly applied.
Results The final analysis included 153 patients, with 104 (68%) classified as SUDn-E and the remaining 32% as SUDn-AT. Patients in the SUDn-AT group had a higher systolic BV (P=0.012) and diastolic BV (P=0.020) than those in the SUDn-E group. Multivariable logistic regression analysis revealed that age (odds ratio [OR], 1.08; 95% confidence interval [CI], 1.03–1.13; P=0.003), systolic BV (OR, 3.11; 95% CI, 1.41–6.85; P=0.005), and diastolic BV (OR, 1.08; 95% CI, 1.02–1.14; P=0.009) were associated with SUDn-AT.
Conclusions Within the TOAST system, two SUDn entities may be distinguishable, with potentially different underlying etiologies: atherothrombosis and embolic stroke of undetermined source.
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