Overview

Pulse pressure is the difference between systolic and diastolic blood pressure, a critical parameter in measuring high blood pressure. Some factors affecting pulse pressure, such as age, respiratory pressure changes, and pathological conditions, are explored.

Hypertension is a chronic heart condition characterised by high blood pressure with potential causes, including lifestyle factors, genetics, and underlying health conditions.

In this article, we will explore the relationship between pulse pressure and hypertension, describing the significance of pulse pressure in diagnosing and monitoring hypertension.

Understanding pulse pressure

Definition and calculation of pulse pressure

Pulse pressure is the difference between the systolic (upper) and diastolic (lower) blood pressure readings. 

The systolic blood pressure, the maximum during heart contraction typically measures around 120 mmHg. Diastolic blood pressure, the minimum pressure experienced when the heart relaxes before ejecting blood into the aorta from the left ventricle, is approximately 80 mmHg.¹ Therefore, a normal range of pulse pressure is approximately 40 mmHg.

Pulse pressure is measured in millimetres of mercury mmHg), due to the use of mercury in early sphygmomanometers (pronounced “sfig-mo-ma-nom-et-er”). Mercury is no longer used in these devices or blood pressure cuffs, but millimetres of mercury is maintained as the unit of measurement.¹

Factors affecting pulse pressure

Pulse pressure tends to increase with age, and can indicate possible health problems. The primary determinant of pulse pressure is stroke volume (SV), which measures the flow of blood as the heart beats in preload, afterload and contractility, hence, any changes in stroke volume will affect the pulse pressure.² Other factors that may cause a change in pulse pressure include:

• Respiratory pressure changes
• Shock
• Stress and exercise
• Changes in heart rate
• Interference at the site of measurement

Any pathological states that cause a narrowing or widening of the arteries forcing a change in pressure will also affect pulse pressure. Trauma-induced shock can also narrow pulse pressure. Heart conditions such as aortic regurgitation, heart failure and heart block have been seen to cause a widened pulse pressure.²

Hypertension: causes and effects

Definition of hypertension

As explained earlier blood pressure is recorded with 2 numbers. The systolic pressure (higher number) and the diastolic pressure (lower number) are both measured in millimetres of mercury (mmHg).³

Hypertension, universally defined as systolic blood pressure (SBP) readings of 140 mm Hg or more and/or diastolic blood pressure (DBP) of more than 90 mm Hg, currently ranks among the most common chronic heart conditions.³

Blood pressure levels

Classification of hypertension 

• Primary hypertension is defined as high blood pressure with no underlying condition. It is sometimes called essential hypertension and is the most common form responsible for at least 90% of hypertension cases⁴
• Secondary hypertension is high blood pressure, caused by an underlying condition. It is characterised by high blood pressure not controlled with antihypertensive medications, or it happens or worsens abruptly, the person is young⁵

Causes of hypertension

Risk factors for hypertension include:

• Overweight
• Poor diet
• Inactive lifestyle
• Poor habits such as excessive alcohol intake, smoking
• Ongoing stress
• Age (over 65 years)
• Genetics
• Race (Black African or Black Caribbean descent)
• Environment factors (living in a deprived area)
• Underlying health conditions (e.g. kidney disease, diabetes)
• Certain medications⁶

Effects of hypertension on the body

Untreated hypertension can progressively damage blood vessels and arteries, leading to more serious your risks of developing complications.⁶

For example, hypertension can cause damage to the blood vessels and major arteries when the pressure at which blood travels gets increased. As the artery tears, bad cholesterol flowing through the blood will attach to the walls.

This causes a build-up that narrows the artery and reduces blood flow, causing more damage and weakness to the heart. This can result in symptoms including palpitations, chest pain, shortness of breath, and leg swelling which are signs of chronic medical conditions.⁶

Relationship between pulse pressure and hypertension

Role of pulse pressure in diagnosing hypertension

Pulse pressure is a crucial factor in understanding and diagnosing hypertension.⁷

An increased pulse pressure often indicates a change in stroke volume and an elevated systolic blood pressure.⁷

Clinical significance of elevated pulse pressure in hypertension

Monitoring pulse pressure alongside traditional blood pressure measurements can provide valuable insights into how the heart is fairing, and aid in diagnosing and managing hypertension.⁷

Measurement and monitoring

Methods for measuring pulse pressure

Pulse pressure is calculated by subtracting diastolic from systolic. For example, a reading of 120/80 mmHg, means 40 mmHg is the pulse pressure reading.⁸

It's important to note, that pulse pressure is not the same as heart rate (pulse), which measures heartbeats per minute.⁸

Techniques for monitoring hypertension

Blood pressure is measured using blood pressure machines, with attached arm cuffs. You can click here for information on how blood pressure is tested.⁸

Importance of regular monitoring in hypertension management

Regular blood pressure checks are necessary, if diagnosed with hypertension any changes to be treated as soon as possible to prevent further complications.⁸

In England, you can get your blood pressure tested at most pharmacies, your local GP surgery and even at some workplaces.

Management and treatment

Lifestyle modifications for hypertension management

• Diet changes: reduce your salt intake, encourage a healthy diet with more vegetables, and cut back on alcohol intake to within the recommended limit
• Weight management: aim for a healthy weight
• Lifestyle changes: avoid inactive lifestyle and exercise regularly
• Habit changes: smoking cessation and reduced caffeine intake^3,4

Pharmacological Interventions for hypertension

Medications are necessary if lifestyle modifications are insufficient. Most antihypertensive medications come in tablets and your GP will recommend certain types based on your age and ethnicity. Click here for a list of medications commonly used as antihypertensives.⁴

Role of pulse pressure in determining treatment strategies

Treatment strategies are aimed at reducing both blood pressure and pulse pressure. 

This may include maintaining a heart-healthy diet and improving physical activity. Some patients may benefit from treatment using oestrogen compounds (like hormone replacement (HRT) in post-menopausal women to help increase arterial compliance or taking foods rich in n-3 fatty acids, and decreasing salt intake. Some studies have also suggested the benefit of medicines called ACE inhibitors for arterial wall tears.¹

Complications and prevention

Potential complications of untreated hypertension

Untreated hypertension can lead to severe complications including: 

• Cardiovascular: including angina, atrial fibrillation, or heart failure
• Neurological disorders: including dementia and cognitive decline over time, or stroke
• Eye problems: including blurriness blindness, or choroidopathy
• Skeletal issues: including osteoporosis. Women with menopause are especially at risk
• Respiratory conditions: including pulmonary embolism and aneurysm in the lung, or obstructive sleep apnoea
• Reproductive health issues: including vagina dryness, or sexual dysfunction
• Urinary system: including kidney failure^9,10

Strategies for preventing hypertension-related complications

Consult your GP regarding the best ways to keep your blood pressure at a safe level and prevent further complications using, lifestyle changes, treatment with medicines and ensuring regular monitoring.¹¹

Importance of early detection and management

Early detection and management of hypertension are crucial to prevent further potential complications as mentioned above. The NHS website has further information on ways to prevent or manage hypertension.

Summary

Pulse pressure is the difference between systolic and diastolic blood pressure and serves as a crucial indicator in understanding cardiovascular health. As systolic blood pressure rises, pulse pressure widens, often signalling arterial stiffness and hypertension.

Hypertension, characterised by elevated blood pressure levels, is a common chronic condition with significant health implications. Early detection and management are important to prevent potential complications. 

Lifestyle modifications, pharmacological interventions, and regular monitoring are recommended strategies for hypertension management.