Prevalence of middle cerebral artery stenosis in asymptomatic subjects of more than 40 years age group: a transcranial Doppler study.

INTRODUCTION: Middle cerebral artery (MCA) disease is the most common vascular lesion in stroke. Transcranial Doppler (TCD) is a non-invasive bedside screening method for assessing cerebral blood flow. AIM: To investigate the prevalence of MCA stenosis in asymptomatic but high-risk individuals for stroke. MATERIALS AND METHODS: Prospective study between December 2011 and December 2013. Vascular risk factors considered included: hypertension (HTN), diabetes mellitus, smoking, alcohol consumption, coronary artery disease (CAD), peripheral vascular disease (PVD), hypercholesterolemia and obesity. TCD was performed with portable machine through the temporal windows by use of a standardized protocol. RESULTS: Of the 427 subjects, 374 were analyzed; males 264 (70.6%) and females 110 (29.4%). Mean age was 54.2 ± 7.6 years. The frequency of the risk factors was: HTN 287 (76.7%), diabetes 220 (58.8%), CAD 120 (32.1%), hypercholesterolemia 181 (48.4%), smoking 147 (39.3%), alcohol 99 (26.5%), obesity 198 (52.9%) and PVD 8 (2.1%). Of the 374 subjects, 27 (7.2%) had intracranial arterial stenosis and the rest had normal intracranial arteries. On univariate analysis, subjects with higher age, HTN, CAD, smoking and hypercholesterolemia had higher risk of having intracranial arterial stenosis (P < 0.05). Multivariate analysis showed HTN and CAD are independent risk factors for intracranial arterial stenosis. CONCLUSIONS: Overall prevalence of intracranial arterial stenosis is 7.2% in high-risk population sample from Hyderabad in South India. HTN and CAD are independent risk factors for the development of intracranial arterial stenosis.

Subclinical atherosclerosis in patients with rheumatoid arthritis by utilizing carotid intima-media thickness as a surrogate marker.

BACKGROUND & OBJECTIVES: Patients with rheumatoid arthritis (RA) are more prone for accelerated atherosclerosis and Asian Indians as an ethnic group are predisposed to a high risk of premature atherosclerosis. However, sparse data are available regarding the burden of atherosclerosis among asymptomatic adult patients with RA in south India. We studied the burden of asymptomatic atherosclerosis in adult south Indian patients with RA at Tirupati, Andhra Pradesh, India, utilizing carotid intima-media thickness (CIMT) as a surrogate marker. METHODS: Ultrasound examination of the carotids and CIMT measurement (mm) were carried out in 32 patients with RA, 32 age- and gender-matched normal controls, and 32 patients with atherosclerosis and angiographically proven coronary artery disease. The CIMT values in patients with CAD and normal controls were used to derive the appropriate cut-off value of CIMT for defining atherosclerosis that would be applicable for the ethnic population studied. RESULTS: Patients with RA had a higher mean CIMT (mm) compared with normal control subjects (0.598 ± 0.131 vs 0.501 ± 0.081; p0 = 0.001). Carotid plaque was found more frequently among the cases compared with normal controls [5/32 (15.6%) vs 0/32 (0%), p0 =0.020]. Using this cut-off value derived by the receiver operator characteristic curve method (≥ 0.57 mm; sensitivity 84.4; specificity 90.6%) and the 75 th percentile value among normal controls (≥ 0.55 mm) as surrogate markers, the presence of subclinical atherosclerosis was significantly more among asymptomatic patients with RA compared with normal controls [(59.3 vs 12.5%; p0 <0.001) and (62.5 vs 25%; P<0.001) respectively]. INTERPRETATION & CONCLUSIONS: Based on the present findings CIMT appears to be a useful surrogate marker for detecting subclinical atherosclerosis in adult Indian patients with RA.