What is basilar artery spasm? Basilar artery spasm is a condition in which a blood vessel in the brain called the basilar artery suddenly becomes constricted, resulting in a lack of blood supply to the brain, which is called basilar artery spasm. The most common cause of basilar artery spasm is the interventional factor. The contrast agent injected during the intervention can cause spasm of the basilar artery, and the spasm of the basilar artery can induce symptoms of cerebral ischemia, causing the patient to have difficulty in consciousness and speech, and even induce small infarcts in the brain stem and cerebellum, and stroke, and in severe cases, it can lead to large infarcts in the brain stem, resulting in the patient’s death. In severe cases, this can lead to massive brainstem infarction and death. Therefore, it is important to pay attention to the prevention of basilar artery spasm, and drugs such as nimodipine and nicotinic acid can be given to prevent it. Reversible cerebral vasoconstriction syndrome: It is a group of relatively rare clinical-imaging syndromes, mainly characterized by sudden thunderclap headache (TCH) with or without focal neurological deficits and seizures, with typical vascular changes such as segmental and multifocal stenosis of moderate vascularity in the anterior and posterior intracranial circulation, similar to “bead-like” changes. “bead-like” changes.