Letter to the Editor| Volume 49, ISSUE 5, P515-517, September 2022

The use of transcranial color-coded duplex sonography in a cat with suspected cerebral ischemia

      Transcranial color-coded duplex Doppler sonography (TCCD) is a commonly used tool in human medicine for neuro-intensive monitoring (
      • Rasulo F.A.
      • Bertuetti R.
      Transcranial Doppler and optic nerve sonography.
      ). TCCD allows obtaining and analyzing Doppler flow curve of the artery under evaluation and identifying the systolic peak flow velocity (Vp) and end-diastolic flow velocity (Ved), measures used to calculate the resistance index (RI) using the formula:
      RI = (Vp – Ved) / Vp

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