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Arterial Blood Pressure – Definition, Values & Importance

Arterial blood pressure is the force exerted by circulating blood on artery walls. Measured in mmHg, it is a key vital sign reflecting cardiovascular health.

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Things worth knowing about "Arterial Blood Pressure"

Arterial blood pressure is the force exerted by circulating blood on artery walls. Measured in mmHg, it is a key vital sign reflecting cardiovascular health.

What Is Arterial Blood Pressure?

Arterial blood pressure refers to the force that blood exerts against the walls of the arteries as the heart pumps it through the body. It is one of the most important vital signs in medicine and reflects the overall function of the cardiovascular system. Arterial blood pressure is measured in millimeters of mercury (mmHg).

Blood pressure consists of two main values: the systolic pressure, recorded when the heart contracts and pumps blood out, and the diastolic pressure, measured when the heart relaxes between beats. A typical normal value for a healthy adult is approximately 120/80 mmHg.

Physiological Basis

Arterial blood pressure is influenced by several key factors:

Cardiac output: The volume of blood the heart pumps per minute
Vascular resistance: The resistance that blood vessels present to blood flow
Blood volume: The total amount of circulating blood in the body
Arterial wall elasticity: The flexibility of artery walls affects the pressure difference between systole and diastole

The autonomic nervous system and hormonal pathways, particularly the renin-angiotensin-aldosterone system (RAAS), continuously regulate arterial blood pressure.

Normal Values and Classification

According to the European Society of Cardiology (ESC), arterial blood pressure is classified as follows:

Optimal: below 120/80 mmHg
Normal: 120-129 / 80-84 mmHg
High-normal: 130-139 / 85-89 mmHg
Grade 1 Hypertension: 140-159 / 90-99 mmHg
Grade 2 Hypertension: 160-179 / 100-109 mmHg
Grade 3 Hypertension: 180 or above / 110 or above mmHg
Hypotension (low blood pressure): below 90/60 mmHg

Clinical Relevance: High Arterial Pressure (Hypertension)

Persistently elevated arterial blood pressure, known as arterial hypertension, is one of the most common chronic conditions worldwide. It significantly increases the risk of heart attack, stroke, kidney disease, and atherosclerosis. Hypertension often causes no noticeable symptoms for years and is therefore frequently diagnosed late.

Causes of Hypertension

Primary (essential) hypertension: no single identifiable cause; involves genetic and lifestyle factors
Secondary hypertension: caused by kidney disease, hormonal disorders, or certain medications

Treatment of Hypertension

Lifestyle changes: weight loss, regular physical activity, low-sodium diet, smoking cessation
Medication: e.g., ACE inhibitors, calcium channel blockers, beta-blockers, diuretics

Clinical Relevance: Low Arterial Pressure (Hypotension)

Abnormally low arterial blood pressure, or hypotension, can lead to dizziness, fainting, and reduced organ perfusion. It is common in young, lean women and is usually harmless, but may also indicate heart problems, dehydration, or adrenal insufficiency.

Measuring Arterial Blood Pressure

Blood pressure is typically measured non-invasively using a sphygmomanometer applied to the upper arm or wrist. For reliable results, the patient should be seated and at rest for at least five minutes before measurement. In clinical settings, invasive intra-arterial monitoring may be used for continuous real-time pressure tracking.

References

Williams B et al. - 2018 ESC/ESH Guidelines for the management of arterial hypertension. European Heart Journal, 2018.
World Health Organization (WHO) - Hypertension. Fact Sheet. WHO, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/hypertension
Hall JE, Hall ME - Guyton and Hall Textbook of Medical Physiology. 14th edition. Elsevier, 2020.

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