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9. Some Useful Information about Blood Pressure

9. Some Useful Information about Blood Pressure

What is Blood Pressure?

Blood pressure is a measure of the force of blood flowing against the 

walls of the arteries. Arterial blood pressure is constantly changing 

during the course of the heart's cycle. 
The highest pressure in the cycle is called the 

Systolic Blood Pressure

; 

the lowest is the 

Diastolic Blood Pressure

. 

Both pressure readings, the 

Systolic

 and 

Diastolic

, are necessary to 

enable a doctor to evaluate the status of a patient's blood pressure.

Why is it a Good Thing to Measure Blood Pressure at Home?

Having your blood pressure measured by a doctor can cause anxiety 

which is itself a cause of high blood pressure. As a variety of conditions 

affect blood pressure, a single measurement may not be sufficient for 

an accurate diagnosis. 
Many factors such as physical activity, anxiety, or the time of day, can 

influence your blood pressure. Thus it is best to try and measure your 

blood pressure at the same time each day, to get an accurate 

indication of any changes in blood pressure. Blood pressure is typically 

low in the morning and increases from afternoon to evening. It is lower 

in the summer and higher in the winter.
Blood pressure is measured in millimetres of mercury (mmHg) and 

measurements are written with the systolic pressure before the 

diastolic e.g. A blood pressure written as 140/90, is referred to as 

140 over 90 mmHg.

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