Electroencephalogram and cerebral blood flow diagram:
The discharge phenomenon of brain nerve cells is called EEG, which is detected and amplified by electronic instruments, and the pattern recorded is EEG. EEG examination has its unique value in the diagnosis of epilepsy. Abnormal changes of EEG will also occur in the process of stroke.
For example, the EEG in the acute phase of cerebral hemorrhage often shows generalized high amplitude slow waves, and then the focal area is limited δ Wave. Subarachnoid hemorrhage, common α The wave slows down, the wave amplitude decreases, and the dispersion appears δ Wave.
Cerebral infarction has different EEG changes according to its infarct location. The internal carotid artery system is occluded, and the EEG shows that the innervation area of the middle cerebral artery appears δ Wave sum θ Wave, mainly on the ipsilateral side, but also on the contralateral side; Middle cerebral artery occlusion can have significant slow waves on the side of the lesion for a long time or no change in EEG; The occlusion of anterior and posterior cerebral arteries may have localized EEG abnormalities, but they are mild; Basilar artery occlusion showed normal EEG.
Cerebral blood flow diagram, also known as electroencephalogram, can indirectly judge the blood flow by tracing the changes of vascular impedance. When internal carotid artery thrombosis occurs in stroke patients, it can affect the cerebral blood flow diagram, and the wave flag on the lesion side is low, and the double beat wave is reduced or disappeared. When the common carotid artery on the diseased side was compressed, the amplitude of the diseased side did not change, while when the common carotid artery on the uninjured side was compressed, the amplitude of the diseased side further decreased.
