Blood pressure Facts
Pressure exerted by circulating blood upon the walls of blood vessels
- In general, Blood pressure is the arterial pressure of the systemic circulation.
- Because of heartbeat, the pressure varies between maximum (systolic) and a minimum (diastolic).
- BP is a principal vital sign to know about the health situation of a person.
- BP drops most rapidly along the small arteries and arterioles and continues to decrease as the blood moves through the capillaries and back to the heart through veins.
- BP is measured as systolic pressure over diastolic pressure (mmHg), for example 140/90.
- A systolic of 90-120 and diastolic of 60–79 is generally the desired BP for an individual.
- A person with systolic < 90 and/or diastolic < 60 is said to be having hypotension.
- As systolic readings increase over 120 and diastolic increase over 80, the person goes into Prehypertension, Stage 1 Hypertension, Stage 2 Hypertension and Hypertensive Crisis situations.
- During pregnancy, the BP in the fetal aorta is approximately 30 mmHg at 20 weeks of gestation, and increases to approximately 45 mmHg at 40 weeks of gestation.
- Blood pressure that is too low is known as hypotension.