on November 29, 2004
Published online before print November 29, 2004, doi: 10.1161/01.STR.0000150496.27584.e3
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Submitted on June 20, 2004
From the Stroke Treatment Team (OYC, ZG, JS, MSC, EAN, HS, C-IC, YI, JCG, AVA), the University of Texas-Houston, Texas; and the Department of Neurology (S.C.), Hospital Central Universitario de Asturias, Oviedo, Spain. * To whom correspondence should be addressed. E-mail: avalexandrov{at}att.net.
Background and Purpose--We routinely perform an urgent bedside neurovascular ultrasound examination (NVUE) with carotid/vertebral duplex and transcranial Doppler (TCD) in patients with acute cerebral ischemia. We aimed to determine the yield and accuracy of NVUE to identify lesions amenable for interventional treatment (LAITs). Methods--NVUE was performed with portable carotid duplex and TCD using standardized fast-track (<15 minutes) insonation protocols. Digital subtraction angiography (DSA) was the gold standard for identifying LAIT. These lesions were defined as proximal intra- or extracranial occlusions, near-occlusions, Results--One hundred and fifty patients (70 women, mean age 66±15 years) underwent NVUE at median 128 minutes after symptom onset. Fifty-four patients (36%) received intravenous or intra-arterial thrombolysis (median National Institutes of Health Stroke Scale (NIHSS) score 14, range 4 to 29; 81% had NIHSS Conclusions--Bedside neurovascular ultrasound examination, combining carotid/vertebral duplex with TCD yields a substantial proportion of LAITs in excellent agreement with urgent DSA.
Revised on October 26, 2004
Accepted on October 27, 2004
Yield and Accuracy of Urgent Combined Carotid/Transcranial Ultrasound Testing in Acute Cerebral Ischemia
Oleg Y. Chernyshev MD, PhD;
50% stenoses or thrombus in the symptomatic artery.10 points). NVUE demonstrated LAITs in 98% of patients eligible for thrombolysis, 76% of acute stroke patients ineligible for thrombolysis (n=63), and 42% in patients with transient ischemic attack (n=33), P<0.001. Urgent DSA was performed in 30 patients on average 230 minutes after NVUE. Compared with DSA, NVUE predicted LAIT presence with 100% sensitivity and 100% specificity, although individual accuracy parameters for TCD and carotid duplex specific to occlusion location ranged 75% to 96% because of the presence of tandem lesions and 10% rate of no temporal windows.
Key words: carotid stenosis • embolism • stroke, acute • thrombolysis • ultrasonography, Doppler
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