![]() Nevertheless, TCD has become a regularly employed tool in neurocritical care and perioperative settings. When performed in isolation, the contribution of TCD to improving patient outcome has not been established. Transcranial Doppler ultrasonography assists in the clinical decision-making regarding further diagnostic evaluation and therapeutic interventions. Too often, the first sign is a neurologic deficit, which may be too late to reverse. Vasospasm following SAH is a very important source of morbidity and mortality. Transcranial Doppler ultrasonography can be useful pre-, intra- and post-operatively, while helping to recognize the development of cerebral vasospasm before the onset of its clinical effects. Transcranial Doppler ultrasonography is a relatively new, non-invasive tool, allowing for bedside monitoring to determine flow velocities indicative of changes in vascular calibre. Repeated clinical assessments of a patient's neurological status carry the problem of detecting the clinical signs and symptoms of vasospasm, which occur only after vasospasm has already manifested its deleterious effects on the cerebral parenchyma. Transcranial Doppler (TCD) is a non-invasive ultrasound technique, not utilizing ionizing radiation. Obviously, it is not feasible to perform such investigation as frequently as bedside clinical assessment. We searched Medline (1980 to August 2007) and Embase (1980 to August 2007) and reviewed all relevant manuscripts regarding TCD and SAH.Ĭurrently, the gold standard for vasospasm diagnosis is cerebral angiography, replaceable by computed tomography angiography, only when angiography is not available. TCD Examination and Interpretation of Findings Different depth range, ow direction, and normal age-related ow velocity (FV) ranges. This technique takes advantage of acoustic windows present in the skull to interrogate the intracranial vascular structures. It is inexpensive, safe, and reliable when compared with other techniques. Transcranial Doppler (TCD) is a non-invasive ultrasound technique, not utilizing ionizing radiation. To review the literature regarding the use of transcranial Doppler ultrasonography (TCD) for monitoring cerebral vasospasm following subarachnoid hemorrhage (SAH). Transcranial doppler evaluation of the intracranial cerebrovascular system will be considered medically necessary in any of the following circumstances: The patient has suspected severe intracranial arterial stenosis based on finite clinical evidence of focal ischemia, and knowledge of this stenosis is necessary in order to properly care for. Transcranial Doppler (TCD) is a diagnostic tool that can be used at bedside to assess the cerebral vas-culature noninvasively. ![]()
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