Transient cerebral ischemia is a transient ischemic attack that is due to vascular lesions, abnormalities in blood components and hemodynamic factors.
1. Vascular lesions: the most common is atherosclerosis, followed by small cerebral arteriosclerosis associated with hypertension. Others include various vasculitis, abnormal vascular development, entrapped arteries, vascular wall damage caused by surgery, puncture, and so on.
2. Abnormalities of blood components: Increase in the content of blood components such as red blood cells, platelets, cholesterol, fibrinogen, etc. leads to increase in blood viscosity, slowing down of blood flow, and easy formation of thrombus in narrowed blood vessels. The presence of abnormal emboli in the blood such as emboli from the heart, gas emboli, fat emboli, etc. can cause transient cerebral embolism.
3. Hemodynamic factors: The regulation of cerebral blood flow is influenced by many factors. The most important one is the change of blood pressure. When the average arterial pressure is lower than 70mmHg and higher than 180mmHg, due to the lesions existing in the blood vessel itself, such as lumen stenosis, the cerebral vascular auto-adjustment function is lost, and the local blood flow supply is transiently impaired.
When transient cerebral ischemic attack occurs, timely medical treatment should be sought to avoid serious consequences.