Transcranial Doppler: advanced technology for assessing cerebral hemodynamics.

Transcranial Doppler (TCD) is an expanding noninvasive technology used in a wide array of patients with altered neurological states for assessing cerebral hemodynamic status. The critical care nurse who is familiar with the principles of TCD can assist with the procedure and assessment of results. Including the TCD results with her or his other neurological assessment data will identify the first signs of cranial circulatory changes and improve patient outcome.