During the cardiac cycle, the maximum value of the increase in arterial blood pressure reached during ventricular contraction is called the systolic pressure. And because of the elasticity of the arteries part of the energy released during ventricular contraction is stored in the form of elongated elastic fibers in the wall, and the pressure that drives the blood flow to continue in diastole is called diastolic pressure. There are many factors that affect diastolic pressure, but there are two main factors: 1. Heart rate changes have a greater impact on low pressure. When the heart rate increases, the diastolic period is shorter and less blood flows to the periphery through the small arteries in a shorter period of time, thus increasing the amount of blood flowing in the aorta at the end of diastole, resulting in a high diastolic pressure. 2. The elasticity of the arterial wall also has an effect on low pressure. Li Chongjian, Department of Cardiovascular Medicine, Fu Wai Hospital, Beijing, China In old age, the collagen fibers of blood vessels proliferate, gradually replacing smooth muscle and elastic fibers, coupled with atherosclerosis, the elasticity of the vessel wall decreases, reducing the amount of blood returned to the heart and increasing the amount of blood stored in the aorta at the end of diastole, resulting in higher diastolic blood pressure. Treatment can be added with arterial dilators: diuretics.