16459 Renal Hypertension

Overview

Renal hypertension is high blood pressure caused by a problem with the kidneys. It often happens when the blood vessels that carry blood to the kidneys become narrow or blocked. The kidneys then release hormones that make blood pressure go up. It can also happen when kidney disease itself causes the body to hold onto extra salt and fluid.

Renal hypertension is not the most common type of high blood pressure, but it is one of the most common causes of secondary hypertension. Secondary hypertension means high blood pressure caused by another medical condition. It is especially common in people with existing kidney disease or narrowed kidney arteries.

Renal hypertension can affect people of any age, but it is more likely in adults over 50, people with diabetes or high cholesterol, smokers, and people with a family history of kidney or blood vessel disease. It can also affect younger adults, especially those with a condition that narrows the kidney blood vessels.

Symptoms

Common symptoms

• Most people have no symptoms, which is why it is called a 'silent' condition.
• Headaches, especially in the morning
• Dizziness or light-headedness
• Blurred or double vision
• Fatigue or feeling unusually tired
• Shortness of breath
• Chest discomfort

Symptoms in children

• Poor weight gain or slow growth
• Frequent headaches
• Irritability or unusual crying
• Nosebleeds
• Feeling very tired

Symptoms in older adults

• Confusion or trouble concentrating
• Feeling dizzy when standing up
• Worsening of existing health problems, like heart failure or memory issues
• Swelling in the feet or ankles
• Reduced urine output

Causes

Main causes

• Narrowing of the renal arteries — the blood vessels that carry blood to the kidneys
• Hardening of the arteries (atherosclerosis) affecting the kidney blood vessels
• Fibromuscular dysplasia — a condition where the walls of the kidney arteries grow abnormally
• Long-term kidney disease, such as glomerulonephritis or polycystic kidney disease

Risk factors

• Age over 50 or under 30 at the start of high blood pressure
• Smoking or tobacco use
• High cholesterol or hardened arteries
• Diabetes
• Being overweight or obese
• A family history of kidney disease or high blood pressure
• Repeated kidney infections or kidney injuries

When to see a doctor

See a doctor urgently if:

• If your blood pressure is very high (for example, above 180/120 mmHg) and you have a headache or other symptoms, treat it as an emergency.
• If you notice sudden swelling, decreased urination, or blood in your urine.
• If you have chest pain, trouble breathing, or any signs of stroke, call emergency services right away.

Book a routine appointment if:

• If you have high blood pressure that does not go down with medication or lifestyle changes.
• If you have kidney disease and need regular blood pressure checks.
• If you are under 30 or over 50 and develop high blood pressure without a clear cause.

Diagnosis

Your doctor will start by measuring your blood pressure in both arms. If it is high, they will ask about your medical history and do tests to look for kidney-related causes. They may use a stethoscope to listen for a whooshing sound over your abdomen, which can signal a narrowed renal artery.

Tests that may be done

• Blood tests to check kidney function (creatinine, GFR)
• Urine tests to look for protein or blood
• An ultrasound of the kidneys to see their size and blood flow
• A renal artery magnetic resonance angiogram (MRA) or CT angiography to look for narrowings
• A renal isotope scan to see how well each kidney works

What to expect at your appointment

Diagnosis can take several visits. You may be asked to monitor your blood pressure at home with a validated home monitor. Your doctor will likely check a few different blood pressure readings over time. If your kidney arteries are narrowed, you may need to see a kidney specialist (nephrologist) or a blood vessel specialist.

Treatment

Treatment for renal hypertension has two main goals: lower your blood pressure to a safer level and protect your kidneys from further damage. Your doctor will create a plan based on the cause of your high blood pressure, your overall health, and how well your kidneys are working. Treatment may include lifestyle changes, medications, or a procedure to open a narrowed artery. It is important to follow your treatment plan, even if you feel well.

Self-care at home

• Check your blood pressure at home as instructed and keep a record for your doctor.
• Take all prescribed medicines exactly as directed, even when your blood pressure seems normal.
• Avoid smoking and secondhand smoke.
• Limit alcohol.
• Find ways to manage stress, like gentle exercise, deep breathing, or hobbies.
• Weigh yourself regularly and tell your doctor about sudden weight gain.

Medical treatments

Doctors commonly prescribe blood pressure medicines that work by relaxing blood vessels or helping the kidneys remove extra fluid. These are called ACE inhibitors, ARBs, calcium channel blockers, or diuretics. They may also prescribe any of these in combination. The choice of medicine depends on your kidney function and other health conditions. It is important to keep taking them exactly as recommended. In addition, your doctor may prescribe medicines to control cholesterol or diabetes, which can slow damage to the kidney arteries.

When is surgery considered?

If a narrowed renal artery is the main cause, a procedure called angioplasty may be considered. A doctor threads a small tube into the artery and opens a tiny balloon to widen the narrowed area. A small wire mesh tube called a stent may be left in place to keep the artery open. This procedure is often done by an interventional radiologist or vascular specialist. In rare cases, surgery to bypass the narrowed artery may be needed.

Living with this condition

Living with renal hypertension means staying on top of your blood pressure and kidney health. You will likely need regular check-ups and blood tests. Keep a list of your medicines and take them every day. Continue to monitor your blood pressure at home if your doctor recommends it. If you notice any new symptoms, tell your doctor. With good management, many people live full and active lives.

Lifestyle tips

• Be physically active for at least 30 minutes on most days, such as brisk walking or cycling.
• Reach and keep a healthy weight.
• Manage stress with mindfulness, gentle yoga, or talking to a counsellor.
• Get enough sleep — aim for 7 to 9 hours a night.
• Avoid smoking and secondhand smoke.

Diet and exercise

Eat a diet low in salt and high in fruits, vegetables, whole grains, and lean protein. The DASH diet (Dietary Approaches to Stop Hypertension) is a good example. Limit processed foods, fast food, and canned soups, which are often very salty. Drink water and avoid sugary drinks. Talk to your doctor or a dietitian about your specific potassium and protein needs, because kidney problems may require adjustments.

Mental health and emotional wellbeing

Living with a chronic condition can be stressful. You may feel anxious or worried about your blood pressure and kidney health. It is normal to feel this way. Talk to your doctor about your feelings. Connecting with others, joining a support group, or talking to a mental health professional can also help. Remember that taking care of your emotional health is part of taking care of your body.

Prevention

You cannot always prevent renal hypertension, especially if it is caused by a genetic problem or kidney disease. However, you can reduce your risk of the most common cause — narrowing of the kidney arteries due to hardening of the arteries — by not smoking, eating a heart-healthy diet, staying physically active, keeping blood sugar and cholesterol in a healthy range, and maintaining a healthy weight.

Vaccines

There are no vaccines to prevent renal hypertension. However, staying up to date on all recommended vaccinations, including the flu and pneumococcal vaccines, can help prevent infections that might complicate kidney health.

Screening programmes

Regular blood pressure checks are a simple and effective screening tool. If you have diabetes, kidney disease, or a family history of high blood pressure, ask your doctor how often you should have your blood pressure measured. Detecting high blood pressure early makes it easier to treat.

Complications

If left untreated

• Kidney damage leading to chronic kidney disease or kidney failure
• Increased risk of heart attack or heart failure
• Stroke or mini-stroke (TIA)
• Damage to the eyes (retinopathy)
• Hardening of the arteries (atheriosclerosis) getting worse

Long-term outlook

With early and consistent treatment, most people with renal hypertension can keep their blood pressure under control and protect their kidneys. Many people live long, healthy lives without serious complications. Newer treatments and procedures are improving outcomes all the time. Your doctor can give you the most realistic outlook based on your specific situation. Staying committed to your plan and communicating openly with your healthcare team makes a real difference.

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