Usefulness of Transcranial Color-Coded Sonography in the Diagnosis of Cerebral Vasospasm
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To the Editor:
We read with great interest the article by Proust et al1 on the sonographic diagnosis of cerebral vasospasm that was recently published in Stroke. Although we do agree with their conclusions, two important methodological aspects of their article deserve further comment and clarification to make their results reproducible.
First, the authors state that they measured the diameter of the middle cerebral artery (MCA) as well as the velocity at a distance of 2 cm from the internal carotid artery (ICA) bifurcation. Even ignoring the fact that the site of measurement of the MCA diameter, demonstrated in their article in Figure 1, appears to be at a distance of 8 mm from the ICA bifurcation, the average length of the M1 segment …