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[Intracranial pressure increase and changes in cerebrovascular circulation, associated with brain death, studied by
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Transcranial Doppler sonography reveals characteristic blood flow patterns in brain death patients. Oscillating flow, systolic spikes, and "zero Flow" indicate cessation of cerebral blood flow, aiding in brain death diagnosis.
Area of Science:
- Neurology
- Medical Imaging
- Critical Care Medicine
Background:
- Diagnosing brain death requires definitive evidence of circulatory arrest.
- Transcranial Doppler (TCD) sonography is a non-invasive tool for assessing cerebral blood flow.
Purpose of the Study:
- To describe the characteristic transcranial Doppler (TCD) findings associated with increasing intracranial pressure and brain death.
- To evaluate the utility of TCD in identifying the cessation of cerebral blood flow.
Main Methods:
- 24 patients in a state of brain death were examined using transcranial Doppler sonography.
- Velocity-pulse graphs were recorded to analyze blood flow patterns under varying intracranial pressure.
Main Results:
- Characteristic velocity-pulse graphs were observed with progressively increasing intracranial pressure.
- Different forms of oscillating flow and their chronological development were described.
- Specific TCD signs, including oscillating flow, systolic spikes, and "zero Flow", were identified as indicators of ceased cerebral blood flow.
Conclusions:
- Transcranial Doppler sonography can identify specific flow patterns indicative of brain death.
- These TCD signs provide valuable evidence for the diagnosis of brain death.
- The study highlights the role of TCD in confirming the cessation of cerebral blood flow.
Abstract:
Blood flow velocity of 24 patients in state of the brain death were examined by transcranial Doppler sonography. Authors expound the characteristic velocity-pulse graphs recorded in progressively increasing intracranial pressure and their chronology as well. The different forms of the oscillating flow and their successive development are described. The oscillating flow, the systolic spikes and the so called "zero Flow" are the transcranial Doppler signs of the ceased cerebral blood flow, and these signs can be used as one of the evidence of the brain death.