Abstract
Transcranial Doppler ultrasonography (TCD) allows easy bedside monitoring of cerebral circulation and can be used repeatedly and continuously at low cost. A high level of skill is required to obtain a sonogram of an individual blood vessel through the transtemporal bone window with this technique. However, the use of transcranial color duplex imaging and the power motion mode has further facilitated the measurement of blood flow velocity in the brain by this method. Cerebral autoregulation and cerebrovascular CO2 reactivity can be determined by TCD and are useful prognostic indicators in patients with cerebral infarction, subarachnoid hemorrhage, or head trauma. Transcranial Doppler ultrasonography is also suitable in evaluating cerebrovascular stenosis, vasospasm following subarachnoid hemorrhage, vascular patency following cerebral infarction and cerebral circulation in patients with intracranial hypertension. Furthermore, microemboli that have disseminated to the brain during carotid endarterectomy or cardiovascular surgery can be detected by TCD as microembolic signals. New techniques to differentiate between gaseous and solid microemboli are currently under development. We anticipate that the utility of TCD as a useful bedside monitoring tool for evaluating cerebral circulation will become increasingly recognized.
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Ishida, K., Yamashita, A., Matsumoto, M. (2015). Role of Transcranial Doppler Ultrasonography in Neuroanesthesia. In: Uchino, H., Ushijima, K., Ikeda, Y. (eds) Neuroanesthesia and Cerebrospinal Protection. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54490-6_19
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DOI: https://doi.org/10.1007/978-4-431-54490-6_19
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