Abstract WP267: Association Between Arterial Resistance and Subtypes of Cerebral Small Vessel Disease

Abstract

Introduction: Increased arterial resistance is a potential pathophysiological mechanism in the pathogenesis of cerebral small vessel disease (cSVD). In this study, we aimed to investigate the association between puslatility index (PI) representing cerebral arterial resistance and subtypes of cSVD in patients with stroke due to small vessel occlusion (SVO). Hypothesis: Pattern of increased arterial resistance may be different between individual subtypes of cSVD. Methods: We included consecutive patients with SVO between 2010 and 2013. White matter hyperintensity (WMH) volume was rated using semi-automated quantitative methods. And the presence of old lacunar infarct (OLI), cerebral microbleed (CMB), or enlarged perivascular space (EPVS) was also evaluated. The relationship between PI, measured with transcranial Doppler sonography in each middle cerebral artery, and subtypes/burden of cSVD was analyzed in the relevant hemisphere. Results: A total of 206 patients with 412 hemispheres were included (mean age: 64 years, male: 68%). In multivariable analysis, PI was positively associated with the WMH volume [beta = 1.372, 95% confidence interval (CI) = 0.624 to 2.120, P < 0.001] after adjusting confounders. PI was also related to the presence of OLI (adjusted odds ratio = 11.37, 95% CI = 2.55-48.56, P = 0.001), however this relationship was not significant in CMB or EPVS. Regarding to the cSVD burden, PI increased according to the WMH tertiles ( P for trend < 0.001), and burden of OLI ( P for trend = 0.004) in a dose-response manner. Conclusion: Association of cerebral arterial resistance is different between subtypes of cSVD, which is suggestive of underlying pathophysiological difference. Simple measure of PI seems to be useful to estimate the arterial resistance and the burden of cSVD.