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Pulmonary hypertension is high blood pressure in the blood vessels that supply the lungs (pulmonary arteries).

It's a serious condition that can damage the right side of the heart.

The walls of the pulmonary arteries become thick and stiff, and cannot expand as well to allow blood through.

The reduced blood flow makes it harder for the right side of the heart to pump blood through the arteries.

If the right side of your heart has to continually work harder, it can gradually become weaker. This can lead to heart failure.

Pulmonary hypertension is a rare condition that can affect people of all ages, but it's more common in people who have another heart or lung condition.

Symptoms of pulmonary hypertension

Symptoms of pulmonary hypertension include:

• shortness of breath
• tiredness
• feeling faint or dizzy
• chest pain (angina)
• a racing heartbeat (palpitations)
• swelling (oedema) in the legs, ankles, feet or tummy (abdomen)

The symptoms often get worse during exercise, which can limit your ability to take part in physical activities.

If you have a type of pulmonary hypertension known as pulmonary arterial hypertension (PAH), you may not have any symptoms until the condition is quite advanced.

When to get medical help

See a GP if you have any symptoms of pulmonary hypertension. They may ask you about your symptoms and medical history, and they may carry out a physical examination.

Call 112 or go to A&E if you get sudden chest pain that does not stop after a few minutes, or you have heart palpitations with chest pain, shortness of breath or feeling faint. These could be a sign of another condition such as a blood clot in your lungs or a serious heart problem.

Correctly diagnosing pulmonary hypertension can sometimes take time because its symptoms are similar to those of many other heart and lung conditions.

Tests you may have include a type of heart scan called an echocardiogram, and right heart catheterisation, where a thin, flexible tube is inserted into your pulmonary artery.

Read more about how pulmonary hypertension is diagnosed.

Causes of pulmonary hypertension

The changes in the pulmonary arteries that lead to pulmonary hypertension can be caused by:

• various conditions that cause problems with the smaller branches of the pulmonary arteries (PAH)
• conditions that affect the left side of the heart
• lung diseases or a shortage of oxygen in the body (hypoxia)
• blood clots that cause narrowing or a blockage in the pulmonary arteries

Read more about the causes of pulmonary hypertension.

Treating pulmonary hypertension

Pulmonary hypertension cannot be cured, but treatment can reduce the symptoms and help you manage your condition. 

Pulmonary hypertension usually gets worse over time. Left untreated, it may cause heart failure, which can be fatal, so it's important treatment is started as soon as possible.

If another condition is causing pulmonary hypertension, the underlying condition should be treated first. This can sometimes prevent the pulmonary arteries being permanently damaged.

Treatments for pulmonary hypertension may include anticoagulant medicines to reduce the blood's ability to thicken (clot) and diuretics to remove excess fluid as a result of heart failure.

You may also be offered medicine to widen the blood vessels.

Home oxygen therapy may also be prescribed if the level of oxygen in your blood is low.

Read more about treating pulmonary hypertension.

Outlook

The outlook for pulmonary hypertension varies, depending on factors such as:

• what's causing it
• how quickly it's diagnosed
• how advanced your symptoms are
• whether you have another underlying health condition

The specialist in charge of your care will be able to give you more detailed information.

Having pulmonary hypertension can affect your ability to carry out everyday activities.

 Causes Pulmonary hypertension 

Pulmonary hypertension is caused by changes to the pulmonary arteries, the blood vessels that carry blood from the heart to the lungs.

There are 5 main types of pulmonary hypertension.

Pulmonary arterial hypertension

Pulmonary arterial hypertension (PAH) covers several conditions that cause changes in the smaller branches of the pulmonary arteries.

The walls of the arteries become thick and stiff, narrowing the space for blood to pass through and increasing blood pressure.

PAH can be caused by conditions including:

• connective tissue diseases – such as scleroderma, a condition that causes thickened areas of skin and problems with blood vessels
• congenital heart problems – such as a hole in the heart
• portal hypertension – abnormally high blood pressure in the vein that takes blood to the liver, usually caused by a problem with the liver
• HIV

It can also be caused by certain medicines or drugs.

A small number of people develop PAH without having any other medical condition. This is called idiopathic PAH. In very rare cases, PAH can be inherited. 

Persistent pulmonary hypertension of the newborn

In rare cases, newborn babies can have high pressure inside their blood vessels, which means their heart cannot pump enough oxygenated blood around their body. This is known as persistent pulmonary hypertension of the newborn (PPHN).

Treatment in an intensive care unit may be needed if simple measures such as keeping the baby warm and giving oxygen do not increase oxygen levels to normal.

Pulmonary hypertension linked to left heart disease

If there are problems with the left side of the heart, the right side has to work harder to pump blood through the lungs. This increases blood pressure in the pulmonary arteries.

Problems with the left side of the heart are thought to be one of the most common causes of pulmonary hypertension. These include mitral valve problems, left ventricle problems and aortic valve conditions.

Pulmonary hypertension linked with lung disease or lack of oxygen

Pulmonary hypertension is also sometimes linked with lung diseases or lack of oxygen (hypoxia), including:

• chronic obstructive pulmonary disease (COPD) – a number of lung conditions that affect breathing
• interstitial lung disease – a group of lung disorders that cause scarring of the lung tissue, which makes it difficult to get enough oxygen into your body
• conditions that affect breathing while you're in a deep sleep – such as sleep apnoea

Low levels of oxygen in the blood make the pulmonary arteries narrow. This squeezes the blood into a smaller space, which increases blood pressure, causing pulmonary hypertension.

Pulmonary hypertension caused by blood clots

Pulmonary hypertension can sometimes be caused by scars from previous blood clots that narrow or block the pulmonary arteries. This is called chronic thromboembolic pulmonary hypertension.

A blood clot that blocks one of the blood vessels that supply your lungs is called a pulmonary embolism.

Pulmonary hypertension caused by other conditions

Other, less common, causes of pulmonary hypertension include: 

• conditions that cause inflammation, including sarcoidosis and vasculitis
• metabolic conditions such as thyroid disease and glycogen storage disease
• blood disorders such as sickle cell disease and thalassaemia
• chronic kidney disease
• compression of the blood vessels in the lungs – for example, as the result of a tumour

Read about how pulmonary hypertension is diagnosed.

 Diagnosis Pulmonary hypertension 

Pulmonary hypertension can be difficult to diagnose because the symptoms are similar to those of other heart or lung conditions.

This means there can sometimes be a delay before a correct diagnosis is made.

See a GP if you have symptoms of pulmonary hypertension, such as breathlessness and tiredness.

Initial assessment

A GP may ask about:

• your symptoms and how they affect your life
• your family history – although rare, pulmonary arterial hypertension can run in families
• any medicine you're currently taking
• any other medical conditions you have

You may also have a physical examination where a GP will listen to your heart and lungs, and check for any swelling in your legs or ankles.

Further tests

If a GP thinks you may have pulmonary hypertension, they'll recommend further tests.

The 2 main tests used to help diagnose the condition are:

• an echocardiogram – a scan that uses high-frequency sound waves to create an image of the heart; it's used to estimate the pressure in your pulmonary arteries and test how well both sides of your heart are pumping
• right heart catheterisation – a thin, flexible tube (catheter) is inserted into a vein in your neck, arm or groin, and passed through to your pulmonary artery to confirm a diagnosis by accurately measuring the blood pressure in the right side of your heart and pulmonary arteries; it's carried out in specialist national pulmonary hypertension centres

Other tests you may have include:

• an electrocardiogram (ECG) – a simple test that can be used to check your heart's rhythm and electrical activity
• a chest X-ray – to check for symptoms such as an enlarged heart or scarring in your lungs, which can cause shortness of breath
• lung function tests – to assess how well your lungs work
• exercise tests – where you carry out some form of exercise while your heart rate, blood pressure and oxygen levels are monitored
• a ventilation-perfusion scan – where the amount of air and blood flow in your lungs is measured; it's used to look for blood clots that may be causing pulmonary hypertension
• blood tests – to rule out other possible conditions, such as thyroid and liver disease

Classifying pulmonary hypertension

If you're diagnosed with pulmonary hypertension, your condition will be classified depending on how severe your symptoms are. This is to help work out the best treatment for you.

It's usually classified into 4 types, where: 

• ordinary physical activities do not cause any symptoms
• ordinary physical activities cause symptoms, such as chest pain or tiredness, but you do not have any symptoms when resting
• even slight physical activities, such as moving your arms, cause symptoms, but you do not have any symptoms when resting
• you have symptoms when resting that get worse with any type of physical activity

Read about how pulmonary hypertension is treated.

 Treatment Pulmonary hypertension 

Pulmonary hypertension cannot be cured, but treatments can reduce your symptoms and help you manage your condition.

If the cause is identified and treated early, it may be possible to prevent permanent damage to your pulmonary arteries, which are the blood vessels that supply your lungs.

Treating underlying conditions

If pulmonary hypertension is caused by another condition, such as a heart or lung problem, treatments will focus on the underlying condition.

If pulmonary hypertension is caused by blood clots that block the pulmonary arteries, you may be offered anticoagulant medicines to prevent more clots forming. 

You may also be offered an operation known as a pulmonary endarterectomy.

Specialist centres for pulmonary hypertension

If you have pulmonary hypertension, you'll usually be referred to a centre that specialises in treating this condition. There are 7 centres in England and 1 in Scotland.

They are:

Treatments for pulmonary hypertension

There are many treatments for pulmonary hypertension. Which treatment or combination of treatments you'll be offered will depend on a number of factors, including what type of pulmonary hypertension you have, what's causing it and the severity of your symptoms.

Treatments include:

• anticoagulant medicines – such as warfarin to help prevent blood clots
• diuretics (water tablets) – to remove excess fluid from the body caused by heart failure
• home oxygen therapy – this involves inhaling air that contains a higher concentration of oxygen than normal
• digoxin – this can improve your symptoms by strengthening your heart muscle contractions and slowing down your heart rate

There are also a number of specialist treatments for pulmonary hypertension that help relax the arteries in the lungs and reduce the blood pressure in the lungs.

These medicines may slow the progression of pulmonary hypertension, and may help to control or reduce the symptoms.

Other treatments that are sometimes used are:

• endothelin receptor antagonists – such as bosentan, ambrisentan and macitentan
• phosphodiesterase 5 inhibitors – sildenafil and tadalafil
• prostaglandins – epoprostenol, iloprost and treprostinil
• soluble guanylate cyclase stimulators – such as riociguat
• calcium channel blockers – nifedipine, diltiazem, nicardipine and amlodipine

Surgery and procedures for pulmonary hypertension

Some people with pulmonary hypertension may need surgery. The types of surgery currently used are:

• pulmonary endarterectomy – an operation to remove old blood clots from the pulmonary arteries in the lungs in people with chronic thromboembolic pulmonary hypertension
• balloon pulmonary angioplasty – a new procedure where a tiny balloon is guided into the arteries and inflated for a few seconds to push the blockage aside and restore blood flow to the lung; it may be considered if pulmonary endarterectomy is not suitable, and has been shown to lower blood pressure in the lung arteries, improve breathing, and increase the ability to exercise
• atrial septostomy – a small hole is made in the wall between the left and right atria of the heart using a cardiac catheter, a thin, flexible tube inserted into the heart's chambers or blood vessels; it reduces the pressure in the right side of the heart, so the heart can pump more efficiently and the blood flow to the lungs can be improved
• transplant – in severe cases, a lung transplant or a heart-lung transplant may be needed; this type of surgery is rarely used because effective medicine is available

Pulmonary Hypertension Association UK

The website provides further information and advice about all aspects of the condition, including living with pulmonary hypertension, and support for family and friends.