Blood pressure is the force exerted by circulating blood against the walls of the body's arteries, which are the major blood vessels. Maintaining healthy blood pressure is crucial for overall cardiovascular health. Here’s a detailed overview of blood pressure, including what it is, how it’s measured, and tips for managing it:
Understanding Blood Pressure
- Systolic Pressure: The top number in a blood pressure reading, indicating the pressure in the arteries when the heart beats.
- Diastolic Pressure: The bottom number, representing the pressure in the arteries when the heart rests between beats.
For example, a blood pressure reading of 120/80 mmHg means a systolic pressure of 120 and a diastolic pressure of 80.
Blood Pressure Categories
According to the American Heart Association, blood pressure levels are categorized as follows:
- Normal: Systolic <120 mmHg and Diastolic <80 mmHg
- Elevated: Systolic 120-129 mmHg and Diastolic <80 mmHg
- Hypertension Stage 1: Systolic 130-139 mmHg or Diastolic 80-89 mmHg
- Hypertension Stage 2: Systolic ≥140 mmHg or Diastolic ≥90 mmHg
- Hypertensive Crisis: Systolic >180 mmHg and/or Diastolic >120 mmHg (requires immediate medical attention)
Measuring Blood Pressure
Blood pressure is measured using a device called a sphygmomanometer, which may be manual or digital. It typically involves placing a cuff around the upper arm, inflating it to restrict blood flow, and then slowly releasing it while measuring the pressure.