How much is the difference between high and low pressure normal

Under normal circumstances, the difference between high pressure and low pressure is 40mmHg.

The difference between high pressure and low pressure, that is, the difference between systolic and diastolic blood pressure, is called the pressure gradient. Clinically, it is also called pulse pressure. Under normal circumstances, the pulse pressure value is generally 40mmHg. This value is mainly affected by systolic and diastolic blood pressure, so any factor that can affect systolic and diastolic blood pressure can cause pulse pressure to change. Clinically, when the pulse pressure value is greater than 60mmHg, it is called pulse pressure increase, which may be related to aortic valve insufficiency, aortic sclerosis, hyperthyroidism, severe anemia, rheumatic heart disease and other diseases; when the pulse pressure value is less than 20mmHg, it is called pulse pressure decrease, which may be related to pericardial effusion, constrictive pericarditis, severe mitral stenosis, aortic stenosis, severe heart failure and other diseases.