Transcranial Doppler ultrasonography of the basilar artery in patients with retrograde vertebral artery flow Carl Harper, ScB, Paul A. Cardullo, RN,

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Presentation transcript:

Transcranial Doppler ultrasonography of the basilar artery in patients with retrograde vertebral artery flow Carl Harper, ScB, Paul A. Cardullo, RN, MS, RVT, Albert K. Weyman, MD, Robert B. Patterson, MD, RVT Journal of Vascular Surgery Volume 48, Issue 4, Pages 859-864 (October 2008) DOI: 10.1016/j.jvs.2008.05.057 Copyright © 2008 The Society for Vascular Surgery Terms and Conditions

Fig 1 Doppler waveform of the basilar artery in a patient with normal antegrade flow. Velocity is represented as a negative value (downward deflection of the waveform) due to the fact that flow is directed away from the probe. Journal of Vascular Surgery 2008 48, 859-864DOI: (10.1016/j.jvs.2008.05.057) Copyright © 2008 The Society for Vascular Surgery Terms and Conditions

Fig 2 Doppler waveform of a patient with bidirectional basilar flow (note sinusoidal pattern prior to cuff release) which converted to retrograde flow upon release of blood pressure cuff following provocative ischemic challenge. Note the waveform is upright indicating blood flow directed toward the probe (retrograde flow) after cuff release. Journal of Vascular Surgery 2008 48, 859-864DOI: (10.1016/j.jvs.2008.05.057) Copyright © 2008 The Society for Vascular Surgery Terms and Conditions

Fig 3 Distribution of arm:arm indices (AAI) in both antegrade and retrograde basilar flow groups. The retrograde basilar flow group clusters at a value below 0.66 indicated by the vertical line, while the antegrade basilar flow group clusters primarily above 0.66. We arbitrarily chose 0.66 as our threshold, values below which were found be predictive of retrograde basilar flow using Fisher's Exact t Test (P = .015). Journal of Vascular Surgery 2008 48, 859-864DOI: (10.1016/j.jvs.2008.05.057) Copyright © 2008 The Society for Vascular Surgery Terms and Conditions