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脑血流的持久停止必然导致全脑功能不可逆地丧失,即脑死亡。因此,如能正确诊断脑血流停止,仅此一项就能客观地证明脑死亡状态。然而,目前证明脑循环停止的方法,只以脑死亡判定为目的,施行起来过于复杂,在临床上不实用。另外,这些方法原则上仅能显示瞬间的血流状态,但不能证明连续性的脑血流停止。超声波多普勒法不仅使血流的连续监测成为可能,而且无损伤,在床边即可简便施行。兹将本法介绍如下。首先在颈部探查两侧颈内动脉和椎动脉,通过耳机和扩音器听诊各自测得的多普勒音响,同时观察显示在光屏管上的波形。脑血流正常时,在顺流方向的单向性心收缩期,能观察到最连续性流速波形,并能听到连续音响。脑血流停止时,即在脑血管连续造影中造
A permanent cessation of cerebral blood flow inevitably leads to the irreversible loss of whole brain function, which is brain death. Therefore, if the correct diagnosis of cerebral blood flow to stop, alone can objectively prove the state of brain death. However, the current methods of demonstrating that cerebral circulation is stopped are only complicated by brain-death judgments and are too complicated to be clinically useful. In addition, these methods in principle only show transient blood flow status, but can not prove that the continuity of cerebral blood flow stops. Ultrasound Doppler method not only enables continuous monitoring of blood flow possible, but also without injury, can be easily implemented at the bedside. This Law is introduced below. First, both sides of the internal carotid artery and vertebral artery were probed in the neck, and the respective measured Doppler sound was auscultated through the earphone and the loudspeaker. At the same time, the waveform displayed on the screen tube was observed. When the cerebral blood flow is normal, the most continuous waveform of the flow rate can be observed in the unidirectional systole in the downstream direction, and the continuous sound can be heard. Cerebral blood flow to stop, that is, in the continuous cerebral angiography made