Primary Aldosteronism
What is Primary Aldosteronism?
Primary aldosteronism is a condition where your adrenal glands produce too much aldosterone. Aldosterone is a hormone that helps control blood pressure and the balance of sodium and potassium in your body. When too much is made, it can cause high blood pressure that is hard to control with standard medications.
This condition is also called Conn's syndrome. It happens when one or both of your adrenal glands, which sit on top of your kidneys, produce excess aldosterone without the normal signals from your body. The extra hormone causes your kidneys to hold onto too much sodium and release too much potassium.
Primary aldosteronism is more common than many doctors once thought. Studies show it affects about 5 to 10 percent of people with high blood pressure. Finding and treating it early can prevent heart problems, kidney damage, and stroke.
Symptoms
Many people with primary aldosteronism have no symptoms beyond high blood pressure. When symptoms do occur, they often relate to low potassium levels.
- High blood pressure that is difficult to control with medications
- Muscle weakness or cramps
- Frequent urination, especially at night
- Excessive thirst
- Fatigue or feeling tired all the time
- Headaches
- Numbness or tingling
- Temporary paralysis in severe cases
Some people have normal potassium levels and only show high blood pressure. This makes the condition harder to detect without specific blood tests.
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Causes and risk factors
Primary aldosteronism happens when your adrenal glands produce too much aldosterone on their own. About 60 to 70 percent of cases are caused by a benign tumor, called an adenoma, on one adrenal gland. Another 30 to 40 percent are caused by overactivity of both adrenal glands, called bilateral adrenal hyperplasia. Rarely, it can be caused by inherited genetic conditions or adrenal cancer.
Risk factors include having high blood pressure at a young age, especially before age 30. People with blood pressure that does not respond well to medications should be checked. Low potassium levels without a clear cause are another red flag. Family history of early stroke or heart disease may also increase your risk.
How it's diagnosed
Primary aldosteronism is diagnosed through specialized blood tests that measure aldosterone and renin levels. Renin is another hormone that normally controls aldosterone production. The aldosterone to renin ratio, also called the Aldo/PRA ratio, is often elevated in this condition. High aldosterone with low renin suggests your adrenal glands are working independently of normal controls.
These specialized tests require specific preparation and timing. You may need to adjust certain medications before testing. Additional tests like a saline infusion test or imaging studies of your adrenal glands may be needed to confirm the diagnosis. Talk to your doctor about testing if you have hard-to-control high blood pressure or unexplained low potassium.
Treatment options
- Medications called mineralocorticoid receptor antagonists, such as spironolactone or eplerenone, block the effects of excess aldosterone
- Surgery to remove an adenoma on one adrenal gland can cure the condition in many cases
- Blood pressure medications like calcium channel blockers or ACE inhibitors may be added for better control
- Potassium supplements if levels are low
- Reduce sodium intake to help lower blood pressure
- Regular exercise and maintaining a healthy weight
- Limit alcohol and avoid smoking
- Stress management techniques
Frequently asked questions
Primary aldosteronism means your adrenal glands produce too much aldosterone on their own, without normal signals. Secondary aldosteronism happens when something else, like kidney disease or heart failure, causes high renin levels that trigger aldosterone production. The Aldo/PRA ratio helps doctors tell them apart.
Yes, if a single adenoma is causing the problem. Surgery to remove the affected adrenal gland can cure the condition in many patients. If both glands are overactive, medications can control symptoms but the condition requires ongoing treatment. Early diagnosis improves outcomes.
Primary aldosteronism affects about 5 to 10 percent of people with high blood pressure. It is more common in people whose blood pressure is severe or hard to control. Many cases go undiagnosed because symptoms can be subtle or absent.
Untreated primary aldosteronism increases your risk of heart attack, stroke, irregular heartbeat, and kidney damage. The excess aldosterone causes changes in your heart and blood vessels beyond just raising blood pressure. Treatment reduces these risks significantly.
Some blood pressure medications can affect aldosterone and renin levels and may need to be adjusted before testing. Your doctor will give you specific instructions based on which medications you take. Never stop medications without medical guidance, as this can be dangerous.
Excess aldosterone tells your kidneys to release more potassium into your urine while holding onto sodium. Over time, this causes potassium levels in your blood to drop. Low potassium can lead to muscle weakness, cramps, and heart rhythm problems.
Yes, reducing sodium intake can help lower blood pressure and reduce the workload on your heart. Eating potassium-rich foods like bananas, spinach, and sweet potatoes may help if levels are low. However, medication or surgery is usually needed to address the root cause.
Most cases are not inherited, but rare familial forms do exist. If you have a family history of early-onset high blood pressure or primary aldosteronism, genetic testing may be recommended. These inherited forms usually respond well to specific treatments.
With medication, blood pressure and potassium levels often improve within a few weeks. After surgery, it can take 3 to 6 months to see the full benefit. Some people still need blood pressure medication after surgery, but usually at lower doses.
Yes, many people with primary aldosteronism have normal potassium levels. Studies show that 40 to 60 percent of patients do not have low potassium. This is why specialized aldosterone and renin testing is important if you have hard-to-control high blood pressure.