The normal value of MAP blood pressure is 70-105 mmHg, if MAP blood pressure exceeds 105 mmHg, it is called increased mean arterial pressure, and if it is lower than 70 mmHg, it is called low mean arterial pressure. High or low MAP blood pressure has certain effects on the body. Low MAP blood pressure will lead to insufficient blood supply to the heart, brain, kidneys and other vital organs, while high MAP blood pressure will increase the burden on the heart and brain, leading to the occurrence of atherosclerotic diseases. Therefore, it is best to maintain MAP blood pressure at a relatively stable level. It is generally believed that blood flow to the brain is maintained at a relatively stable level when MAP blood pressure fluctuates between 60-160 mmHg.