What is hyperaldosteronism?
One of the functions of your adrenal glands is to produce a hormone called aldosterone that plays an active role in your blood pressure. It does this by maintaining the balance of sodium, potassium, and water in your blood. Hyperaldosteronism is an endocrine disorder that involves one or both of your adrenal glands creating too much of a hormone called aldosterone. This causes your body to lose too much potassium and retain too much sodium, which increases water retention, blood volume, and blood pressure.
The main symptom of hyperaldosteronism is high blood pressure, which can range from moderate to severe. In some cases, high blood pressure related to hyperaldosteronism doesn’t respond to medication. In others, it may only respond to a certain combination of medications.
High blood pressure doesn’t typically have symptoms. But when it does, they can include:
- vision problems
- chest pain
- shortness of breath
The other main symptom of hyperaldosteronism is hypokalemia, which refers to low potassium levels in your blood. While it doesn’t always cause symptoms, more moderate cases of hypokalemia may cause:
- muscle cramps
- increased thirst
- increased urination
- muscle weakness
There are two types of hyperaldosteronism, known as primary and secondary hyperaldosteronism. While they have similar symptoms, their causes are different.
Primary hyperaldosteronism is caused by a problem with one or both adrenal glands. It’s sometimes referred to as Conn’s syndrome.
Some people are born with overactive adrenal glands. Others might have it due to:
- a benign tumor on one of the adrenal glands
- adrenocortical cancer, which is a rare aldosterone-producing cancerous tumor
- glucocorticoid-remediable aldosteronism, a type of aldosteronism that runs in families
- other types of inheritable issues that affect the adrenal glands
Secondary hyperaldosteronism is caused by something outside the adrenal glands. It’s usually related to reduced blood flow to your kidneys.
Several things can cause this, including:
- a blockage or narrowing of the renal artery
- chronic liver disease
- heart failure
- diuretic medications
If you have symptoms of hyperaldosteronism, your doctor will likely start by doing a blood test to check your levels of aldosterone and renin, an enzyme released by your kidney that works with aldosterone to help balance blood pressure. People with hyperaldosteronism generally have low renin levels and high aldosterone levels.
Depending on the results of your blood test, your doctor might run some other tests, including:
- Captopril challenge test. This blood test measures your aldosterone, renin, and other levels after you receive a dose of the medication captopril, an ACE inhibitor.
- Saline infusion test. This blood test measures your aldosterone, renin, and other levels after you receive an IV sodium and saline solution.
- Salt-loading test. This measures the levels of aldosterone and sodium in your urine after following a high-sodium diet for three to five days.
- Fludrocortisone suppression test. This is very similar to the salt-loading test, but it includes taking fludrocortisone, an oral steroid that mimics aldosterone.
- CT or MRI scans of the abdomen. These imaging tests allow your doctor to check for any tumors on or around your adrenal glands.
- Adrenal vein sample. This involves taking a blood sample directly from the veins of each adrenal gland and testing the amount of aldosterone in it. If blood from one gland has significantly more aldosterone, you may have a benign tumor on one gland. If blood from each gland has similarly high levels of aldosterone, both glands are likely overactive.
If you already take medication for high blood pressure, your doctor might ask you to stop taking it for a brief period of time while they do these tests.
Treating hyperaldosteronism focuses on reducing your aldosterone levels or blocking the effects of aldosterone, high blood pressure, and low blood potassium. There are several ways to do this, depending on what’s causing your hyperaldosteronism.
Your doctor might prescribe a mineralocorticoid receptor antagonist, such as spironolactone. This type of medication blocks the effects of aldosterone on your body, such as high blood pressure and low blood potassium. You may still need to take additional medications to help manage your blood pressure.
If you have a tumor on one of your adrenal glands, your doctor may be able to remove the affected gland. Following the procedure, called an adrenalectomy, you’ll likely notice a gradual decrease in blood pressure. As you heal, your doctor will regularly monitor your blood pressure to determine whether it’s time to change your blood pressure medication. Eventually, you may be able to stop taking it completely.
In addition to medication and surgery, there are several lifestyle changes you can make to provide additional health benefits and help counteract the effects of too much aldosterone.
- Eating a healthy diet. Following a balanced diet that helps you maintain a healthy weight can reduce your blood pressure. Start by choosing fresh, unprocessed foods to reduce your salt intake. Try incorporating elements of the DASH diet, which is designed for people with high blood pressure. In addition, many blood pressure medications work better when combined with a healthy diet. A diet lower in salt is often key in hyperaldosteronism.
- Exercising. Consistent exercise, even just a 30-minute walk a few times a week, can help to reduce blood pressure.
- Reducing alcohol and caffeine. Caffeine and alcohol can both increase your blood pressure. Some blood pressure medications are also less effective when taken with alcohol.
- Quitting smoking. Smoking cigarettes constricts your blood vessels, which increases your heart rate and can raise blood pressure. Learn about different methods that can help you kick the habit. Smoking also increases your risk of heart attack and stroke, even without high blood pressure.
High levels of aldosterone can cause a variety of health problems.
- heart attacks
- heart failure
- kidney failure
To avoid complications, work with your doctor to come up with a long-term treatment plan for your high blood pressure. Make sure to regularly follow up to check for any changes in your blood potassium levels as well.
While the effects of hyperaldosteronism can lead to complications over time, the condition itself can be managed with the right treatments. For many people, the best plans involve a combination of surgery, medication, and lifestyle changes.