Hypertension: Understanding Blood Pressure

What is Blood Pressure?
Blood pressure is the force exerted by circulating blood on the walls of blood vessels. It varies in different types of vessels, but when not specified otherwise, the term "blood pressure" refers to arterial pressure in systemic circulation.
Understanding Systolic and Diastolic Pressure
During systole, when the heart contracts and pumps blood into the aorta, aortic pressure increases, as does systemic arterial pressure. The maximum pressure after ejection is called systolic pressure. Between heartbeats, when the ventricles are filling, arterial pressure falls to its lowest value called diastolic pressure. These are the two numbers in a blood pressure reading.
The Normal Blood Pressure Range
Normally, blood pressure shows a daily pattern and is generally lower at night. Throughout the day, it fluctuates with physical activities and emotional states. Normal blood pressure is below 120/80.
Hypertension: The Silent Killer
Hypertension refers to persistently high blood pressure. In the United States, hypertension was once defined as higher than 140/90, but recent guidelines have changed these values to 130/80 for better prevention and management of the disease.
Hypertension itself does not cause symptoms, but it slowly damages blood vessels and, in the long term, is a major risk factor for a variety of cardiovascular diseases such as strokes, aneurysms, and heart attacks, as well as damage to end organs such as kidney failure or vision loss. That's why hypertension is known as the "silent killer".
Primary and Secondary Hypertension
Hypertension can be classified as primary or secondary, with the former being responsible for over 90% of cases. Primary hypertension has no apparent cause and may develop as a result of aging, obesity, high salt diet, lack of exercise, smoking, and alcohol consumption. Often, blood vessels harden with age or unhealthy diets, making blood circulation more difficult.
Secondary hypertension, on the other hand, is caused by an underlying condition. Many conditions and factors can cause hypertension, with notable ones being kidney problems and endocrine disorders.
Treating Hypertension
Treatments for hypertension should start with lifestyle changes such as a healthy, low-sodium diet, regular exercise, and stress management. In addition to that, antihypertensive medications can be used to control hypertension. These include:
- Vasodilators: These medications dilate blood vessels, thereby reducing vascular resistance and lowering blood pressure.
- Diuretics: Diuretics promote the elimination of sodium and water through the kidneys, thus reducing blood volume.
- Medications that decrease cardiac output by reducing heart rate or contractility can also be used to treat hypertension.
By targeting these factors, antihypertensive medications help to lower blood pressure and reduce the risks associated with hypertension.