What Is Normal Blood Pressure ?

Blood pressure is primarily produced when the heart muscle contracts - it is the pressure of blood upon the walls of the blood vessels. There are two recordings, a high one (systolic) and a lower one (diastolic). The systolic pressure is measured when the heart contracts, while the diastolic one is gauged just before the heart contracts.

The heart is the muscle that pumps blood throughout the body during every second of our lives. Low-oxygen blood is pumped towards the lungs, where it becomes oxygen-rich again. Oxygen-rich blood is pumped by the heart around to body to supply tissue, muscle, organs and cells. This pumping generates blood pressure.

According to Medilexicon's medical dictionary, Blood Pressure is:

"The pressure or tension of the blood within the systemic arteries, maintained by the contraction of the left ventricle, the resistance of the arterioles and capillaries, the elasticity of the arterial walls, as well as the viscosity and volume of the blood; expressed as relative to the ambient atmospheric pressure."

Hypertension is when our blood pressure is too high, while hypotension is the opposite; it is when our blood pressure is too low.

Taking a blood pressure measurement

Most of us have had our blood pressure taken at some time in our lives. The procedure is straightforward and provides the doctor or other health care professional with vital data regarding the condition of the patient's blood vessels and heart.

As mentioned above, two blood pressure readings are measured:

• The Systolic Pressure - this is the maximum pressure in an artery. It occurs when the heart contracts; when it is beating, and blood is being pumped through.
• The Diastolic Pressure - this is the minimum pressure in an artery. It occurs just before the heart contracts; in between heartbeats. It occurs when the heart is resting.

If either the systolic or diastolic pressure is too high, the patient has hypertension (high blood pressure). So, both readings are important.

The patient needs to be relaxed and seated or lying down comfortably when their blood pressure is taken. Their arm must be well supported.

What is normal blood pressure?

Normal blood pressure is generally below 120/80 (one-twenty over eighty). 120 represents the systolic measurement and 80 represents the diastolic measurement.

Desirable blood pressure is:

• Systolic - from 90 to 119
• Diastolic - from 60 to 79

High or elevated blood pressure (hypertension)

Prehypertension - this is when the reading is between 120/80 and 139/89.

Hypertension - this is when the reading is at least 140/90.

Health authorities in the UK and USA say that approximately one third of all people with hypertension do not know they have it - meaning, they probably have no symptoms. Experts say we should check our blood pressure now and again because of this, this is especially the case for people who smoke, drink alcohol regularly, are overweight, and are reaching old age.

If symptoms are felt, they may include:

• Blood in urine
• Confusion
• Dizziness
• Fatigue
• Headaches, some quite severe
• Irregular heartbeat
• Pains in the chest
• Problems with breathing
• Vision problems

Low blood pressure (hypotension)

Anybody whose reading is 90/60 (ninety over sixty) mmHg or below has hypotension. For some seemingly healthy patients, in fact, a bit of hypotension is thought to protect them from subsequent hypertension. However, hypotension may mean there is an underlying problem.

If the hypotension is not severe, there may be no symptoms.

If symptoms are felt, they may include:

• Depression
• Dizziness
• Eyesight problems, such as blurred vision
• Light headedness; fainting is possible
• Nausea
• Pale, cold and clammy skin
• Palpitations
• Shallow panting
• Thirst
• Tiredness