This eBook has been developed by Idorsia Pharmaceuticals Ltd as a resource to help the understanding of hypertension. It provides a useful summary of current information about the condition, the diagnosis procedure and available treatments. It also outlines the strategies people with hypertension can use to manage their condition as effectively as possible.

The book is intended for the use of a general audience.

“I struggled to accept the diagnosis at first, because in my mind, only ‘old’ people had high blood pressure and I was just 48 years young! Now I know that whatever your age, it’s important to look after your body.”

Patient

Introduction

High blood pressure (also known as hypertension) is one of the most common medical conditions and its prevalence continues to rise. According to a recent study, the number of people affected by high blood pressure has almost doubled over the past 40 years, with about 1.13 billion people living with the condition worldwide.

As hypertension generally develops over many years with no distinctive warning signs or symptoms, many people don’t even realize they have high blood pressure. Left untreated, it can lead to life-threatening conditions such as heart failure, stroke or kidney disease. The World Health Organization estimates that hypertension causes 7.5 million deaths a year, which equates to about 12.8% of all deaths worldwide.

Many of these deaths could be prevented, as high blood pressure can be detected with a simple test and can often be controlled with a healthier lifestyle and appropriate medication.

“It came as an absolute shock to me to be told that my blood pressure was dangerously high. I had not had any symptoms and was just getting on with my life.”

Patient

Understanding hypertension

Blood pressure is not a steady number, but can be affected by what time of day it is, eating and exercise habits, stress levels and other factors. These short-time fluctuations are normally nothing to worry about, but if blood pressure remains too high for a long period of time, problems may arise. Hypertension – high blood pressure – can “overwork” the heart and cause damage to blood vessels, which can harm other important organs over time.

It is important to understand how our body controls our blood pressure, risk factors for hypertension and the different types of hypertension.

“When I was first diagnosed I bought a blood-pressure pump so I could take my own readings at home and stay on top of my health. This was really helpful as I could tell when my medications weren’t working anymore and simply make an appointment with my doctor to review my treatment.”

Patient

Diagnosis and treatment of hypertension

Almost everyone is familiar with the very simple procedure of having their blood pressure measured, yet relatively few understand the meaning of the two numbers recorded at the reading.

Lowering and controlling blood-pressure levels begins by understanding these numbers.

“When my doctor first told me I had high blood pressure, I thought he had it wrong, so I ignored the recommendations. Five years later I had to undergo bypass surgery as a result of unstable angina. After the surgery, I took my medications every day, making sure I followed the doctor’s orders to the letter. Today, I can live a normal life that’s not affected by my blood pressure.”

— Patient

What medical treatments are available for hypertension?

While making changes towards a healthier lifestyle (as described in the next section) often has a significant impact on lowering blood pressure, they might not be enough on their own and need to be supported by medical treatment. The category of drugs prescribed will depend on the blood pressure category and medical history of the patient.

Blood pressure medications are often more effective in combination than as a single drug. However, finding the most effective combination of drugs while keeping side effects to a minimum can be a challenge. Avoiding unwanted interactions between different medications is therefore an important consideration for the prescribing healthcare professional.

Types of medication for highblood pressure

  • Diuretics target the kidneys to help the body to eliminate sodium and water, which reduces blood volume.
  • Alpha blockers keep the hormone norepinephrine (noradrenaline) from tightening the muscles in the walls of smaller blood vessels, which improves blood flow and lowers blood pressure.
  • Beta blockers work by blocking the effects of epinephrine, a hormone also known as adrenaline. This leads to the heart beating more slowly and with less force and to improved blood flow, which reduces blood pressure.
  • ACE (angiotensin-converting enzyme) inhibitors block the formation of angiotensin II, a substance that narrows blood vessels, which, in turn, lowers blood pressure. People with chronic kidney disease may benefit from having an ACE inhibitor as one of their medications.
  • ARBs (angiotensin II receptor blockers) block the action – rather than the formation – of angiotensin II. Both ACEs and ARBs are often part of the treatment for people with chronic kidney disease.
  • Calcium-channel blockers reduce electrical conduction within the heart by blocking the entry of calcium into the muscle cells. This decreases the force of contraction of the muscle cells and dilates arteries, thus reducing blood pressure.

"I was given three different tablets and it has been a real battle to get my blood pressure down. My blood pressure is never quite what it should be and I find it quite frightening that they can’t seem to control it. Last year I had a small stroke, fortunately I recovered very well and it is only my speech that is sometimes slurred if I get tired."

Patient

Resistant hypertension

If someone’s high blood pressure can’t be lowered despite treatment with a combination of three anti-hypertensive drugs of different categories (including a diuretic), they may have resistant hypertension.

How common is resistant hypertension and who gets it?

Estimations of how many patients with high blood pressure have true resistant hypertension range from 2% all the way to 10%, which reflects the difficulty in diagnosis.

Compared to “regular” hypertension, patients with resistant hypertension are more likely to be older (above 75 years of age), overweight and to have a medical history of diabetes, kidney and heart disease, stroke, and/or sleep apnea. Chronic kidney disease and diabetes in particular make these patients more vulnerable and increase the complexity of finding the right treatment combination.

How is resistant hypertension treated?

“I find it reassuring to go for regular check-ups with my doctor. That way they can easily pick up on any adjustments needed for my medications and I can have peace of mind that everything’s under control.”

— Patient

Generally, the approach for resistant hypertension is to add a fourth antihypertensive medication to the three drugs the patient is already taking. The fourth drug often has a different mechanism of action (the way it works in the body) compared to the other three medications. Yet these drugs often have their own limitations and can be associated with side effects that force the patient to stop taking them.

Therefore, new treatment options for resistant hypertension are needed, especially for patients in whom other, traditional forms of antihypertensive drugs are ineffective.

“Positive lifestyle choices have kept me in control of my blood pressure; I make sure to keep a healthier diet than I did when I was younger and try to do some sort of exercise every day.”

Patient

Guidance on managing hypertension

While effective medical treatment can be the key to lowering blood pressure, especially in severe and resistant hypertension, the role of a healthy lifestyle cannot be overstated.

The lifestyle changes described in this section can not only help to lower blood pressure and keep it down, but also to avoid, delay or reduce the need for medical treatment.

If you find you need support beyond your own social circle, you might consider joining a hypertension support group that provides both emotional guidance and practical tips on coping with the condition.

“Because of the medication I’m on for my blood pressure, I need to be careful not to push myself too hard when I exercise. Instead, I listen to the signs of my body and take breaks when I need; knowing that anything I can do to stay fit is going to help me manage my condition.”

— Patient

This resource has been developed by Idorsia Pharmaceuticals in order to provide an environment to deliver a better understanding of resistant hypertension and to pool information regarding the disease, the diagnosis procedure, available treatments and the impact it could have on the life of someone diagnosed with resistant hypertension. The resource is for use by a general audience.

The information in this resource is not intended as a substitute for advice/treatment by a physician, whose instructions should always be followed. Neither does the information provided constitute an alternative to advice from a doctor or a pharmacist and should not be used on its own to produce a diagnosis or to commence or cease a particular treatment.

The links provided are for informational purposes only; they do not constitute an endorsement or an approval from Idorsia Pharmaceuticals Ltd of the services or opinions of the corporation, organization or individual.

Idorsia Pharmaceuticals Ltd bears no responsibility for the accuracy, legality or content of the external sites or subsequent links. You are requested to contact the respective external site for answers to questions regarding its content.

The information provided is valid on the publication date but may be subject to further modifications. Even though Idorsia aims to provide accurate and up to date information at all times, please acknowledge that the present resource is made available “as is”. Idorsia does not give any warranty or representation, whether expressly stated or implied, of any kind related to the comprehensiveness, usefulness, reliability or timelines of the content of this resource. Idorsia cannot be held liable for any direct or indirect damage of a material or non-material nature that might be caused by the use or non-use of the information presented.