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Purpose: The present study using duplex Doppler sonography (DDS) was conducted to assess collateral flow by the vertebral artery in consecutive patients with cardioembolic stroke without acute severe brain swelling: 9 cases of internal carotid artery occlusion (CES-I group), 7 cases of middle cerebral artery occlusion (CES-M group), 11 cases of atherothrombotic stroke (ATS group) and 21 normal volunteers (control group). Methods: DDS using an SSD-1700 (Aloka) with a 7.5-MHz linear-type probe in the carotid and vertebral artery was performed in all cases. DDS data, mean flow velocity (MFV) and Gosling' s pulsatility index (PI) were analyzed using 7.5-MHz pulsed wave Doppler on the common carotid artery (CCA) and vertebral artery (VA). Results: 1) MFV-CCA was significantly greater than MFV-VA in the ATS and control groups. In the CES-I group, MFV-VA was elevated, but there was no significant correlation between MFV-CCA and MFV-VA. In the CES-M group, there was no significant correlation between MFV-CCA and MFV-VA. 2) MFV-VA in the CES-I group was significantly greater than that in the control or ATS group. 3) PI-CCA was significantly greater than PI-VA only in the ATS group. Conclusion: A high MFV of VA in patients with cardioembolic stroke without acute severe brain swelling might be an indicator of good collateral circulation.

neurosonology

Evaluation of Collateral Flow by the Vertebral Artery Using Duplex Doppler Sonography in Patients with Cardioembolic Stroke without Acute Severe Brain Swelling