1. Observe the changes of TCD/TCCD spectrum shape before and after lumbar puncture in patients with severe neurological disease. 2. Discuss the TCD/TCCD spectrum shape and parameters of cerebral arteries and neurocritical patients Correlation of intracranial pressure.
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The TCD/TCCD spectrum shape and parameters of cerebral arteries are related to the intracranial pressure of neurocritical patients
Timeframe: January 26, 2021 to December 30, 2022