Arterial Vmax is an indicator to check the arteries, suggesting what is the maximum flow rate of blood in the arteries, also known as peak flow rate, generally have a fixed value, too fast or too slow will appear headache, dizziness symptoms. To rule out the possibility of arterial plaque, if there is arterial plaque, long-term standardized treatment is needed, such as antiplatelet aggregation aspirin or plaque stabilization, lipid-lowering drugs, such as statins, there are simvastatin, resuvastatin, etc. The maximum diameter of the Vmax is generally 50cm/s or less is considered normal.