![]() ![]() Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA. Transcranial Doppler ultrasound in the ICU: it is not all sunshine and rainbows. 2 Researchers have noted the necessity of finding a suitable blood vessel in the anterior circulation for diagnosing brain death but have not developed the appropriate. In children and neonates, the Doppler evaluation of the intracranial vessels is complicated further by variation of normal flow velocity according to age. 4 In its consensus statement, the American Academy of Neurology stated the limitations of its efficacy. doi: 10.1186/s1308-9 29340797 Blanco P, Abdo-Cuza A. Transcranial Doppler is an additional method to evaluate brain death. In this review, the authors summarize the basic principles and clinical utility of TCD and provide an overview of a few TCD research applications. Point-of-care transcranial Doppler by intensivists. Thus the future of TCD is still alive, and in some ways the diameter constancy assumption of TCD compared with MRI approaches can be interpreted parsimoniously. Clinical indication and research applications for this mode of imaging continue to expand. ![]() TCD has established utility in the clinical diagnosis of a number of cerebrovascular disorders such as acute ischemic stroke, vasospasm, subarachnoid hemorrhage, sickle cell disease, as well as other conditions such as brain death. ![]() TCD can also be used to assess the physiologic health of a particular vascular territory by measuring blood flow responses to changes in blood pressure (cerebral autoregulation), changes in end-tidal CO2 (cerebral vasoreactivity), or cognitive and motor activation (neurovascular coupling or functional hyperemia). TCD can be used to measure flow velocity in the basal arteries of the brain to assess relative changes in flow, diagnose focal vascular stenosis, or to detect embolic signals within these arteries. Transcranial Doppler (TCD) ultrasound provides rapid, noninvasive, real-time measures of cerebrovascular function. ![]()
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