[Transcranial ultrasonography in neurosurgery]

Area of Science:

• Neurology
• Medical Imaging
• Neurosonology

Background:

• Transcranial Doppler (TCD) sonography is a noninvasive method for evaluating intracranial blood flow.
• Cerebral vasospasm and arteriovenous malformations (AVMs) are significant neurological conditions requiring accurate diagnosis.
• Elevated intracranial pressure (ICP) can lead to critical changes in cerebral hemodynamics.

Purpose of the Study:

• To highlight the diagnostic utility of TCD sonography in various neurological conditions.
• To demonstrate the ability of TCD to detect early signs of cerebral vasospasm.
• To correlate TCD findings with treatment strategies for AVMs and ICP management.

Main Methods:

• Utilizing transcranial Doppler sonography to assess cerebral blood flow velocity.
• Noninvasive imaging of intracranial arteries and feeding vessels of AVMs.
• Analysis of Doppler waveforms for characteristic changes indicative of pathology.

Main Results:

• TCD sonography enables prompt diagnosis of cerebral vasospasm in aneurysmal subarachnoid hemorrhage, often preceding clinical symptoms.
• Feeding arteries of cerebral AVMs can be identified and their variations assessed for treatment planning.
• TCD can reveal vasospasm and altered waveforms in cases of elevated ICP due to head trauma, suggesting circulatory arrest.

Conclusions:

• Transcranial Doppler sonography is an invaluable noninvasive tool for diagnosing and monitoring intracranial circulatory abnormalities.
• TCD findings guide neurosurgical and neuroradiological interventions for AVMs and aid in managing conditions like subarachnoid hemorrhage and head trauma.
• The technique provides crucial information for identifying critical hemodynamic changes, including potential intracranial circulatory arrest.