Association of Lp-PLA.sub.2 Mass and Aysmptomatic Intracranial and Extracranial Arterial Stenosis in Hypertension Patients

Intracranial arterial stenosis (ICAS) is a common cause of ischemic stroke in Asians, whereas whites tend to have more extracranial lesions. Lipoprotein-associated phospholipase A.sub.2 (Lp-PLA.sub.2) has been associated with ischemic stroke by a large amount of work. However, there are few studies focusing on the relationship of Lp-PLA.sub.2 and asymptomatic ICAS or extracranial arterial stenosis (ECAS). Wehereby sought to explore the relationship of Lp-PLA.sub.2 and ICAS, ECAS and concurrent stenosis in stroke-free hypertensive patients in Chinese population. All the subjects were evaluated for the presence and severity of ICAS and ECAS through computerized tomographic angiography (CTA) covered the whole brain down to the level of aortic arch. Lp-PLA.sub.2 mass was measured by enzyme linked immunoassay. The association of Lp-PLA.sub.2 and vascular stenosis was analyzed through multivariate logistic regression. Among 414 participants, 163 (39.4%) had no ICAS or ECAS, 63 (15.2%) had ECAS only, 111 (26.8%) had ICAS only and 77 (18.6%) had concurrent extraintracranial stenosis. Lp-PLA.sub.2 mass was significantly associated with isolated ICAS (OR: 2.3; 95% CI: 1.14-4.64), and concurrent stenosis (OR: 3.93; 95% CI: 1.62-9.51), but was not related to isolated ECAS (OR: 1.54; 95% CI: 0.68-3.48). Lp-PLA.sub.2 mass was also associated with moderate to severe ICAS no matter how was the ECAS. Moreover, patients with higher Lp-PLA.sub.2 mass showed more sever ICAS and had more intracranial arterial lesions. This study revealed the association of Lp-PLA.sub.2 mass with ICAS in stroke-free hypertensive patients in Chinese population. The further long-term cohort study was warranted to elucidate the concrete effect of Lp-PLA.sub.2 on the asymptomatic ICAS.