Constrictive Pericarditis
A stiff, scarred sac that squeezes and limits the heart
Quick Facts
- Type: Cardiovascular condition
- Affected area: Pericardium (sac around the heart)
- Common causes: Prior pericarditis, surgery, radiation, tuberculosis
- Hallmark: Stiff sac restricting heart filling
Overview
Constrictive pericarditis develops when the pericardium, the sac surrounding the heart, becomes thickened, scarred, and rigid. Instead of moving freely with each heartbeat, the stiff sac acts like a tight shell that prevents the heart chambers from filling properly. Over time this limits how much blood the heart can pump and causes blood to back up into the body.
It often follows earlier inflammation of the pericardium (pericarditis), sometimes years before. Because its symptoms overlap with heart failure and other conditions, constrictive pericarditis can be difficult to recognize, but careful evaluation usually identifies it. With treatment, many people improve significantly.
In a healthy heart, the chambers expand easily to draw in blood between beats. When the surrounding sac is rigid, this expansion is limited, so less blood enters the heart and pressure rises in the veins that return blood to it. The result is a pattern of fluid buildup in the body alongside reduced output from the heart. Recognizing this pattern is central to telling constrictive pericarditis apart from other heart problems with similar symptoms.
Symptoms
Symptoms usually develop gradually and result from blood backing up and reduced heart output:
- Swelling of the legs, ankles, and abdomen (fluid retention)
- Fatigue and reduced exercise tolerance
- Shortness of breath, especially with activity
- Bloating or a feeling of abdominal fullness
- Weight gain from fluid buildup
- A pounding or irregular heartbeat
Because these signs resemble other heart and liver conditions, the diagnosis is sometimes missed at first. People may be evaluated for liver disease or general heart failure before constriction is identified, which is why a thorough cardiac assessment is valuable when fluid retention does not have a clear explanation. Symptoms often build slowly over months, so it is easy to attribute them to aging or being out of shape until they become hard to ignore.
Causes
Constrictive pericarditis results from chronic inflammation and scarring of the pericardium. Common causes include:
- Previous pericarditis: Especially viral or recurrent inflammation; in many cases no specific cause is identified.
- Heart surgery: Scarring can develop after cardiac operations.
- Radiation therapy: Past chest radiation, for example for cancer.
- Tuberculosis: A major cause worldwide.
- Connective tissue diseases: Such as rheumatoid arthritis and lupus.
- Kidney failure and certain infections.
Risk Factors
- A history of pericarditis, particularly recurrent episodes
- Prior open-heart surgery
- Past radiation therapy to the chest
- Tuberculosis or other chronic infections
- Autoimmune and connective tissue disorders
- Chronic kidney disease
Diagnosis
Diagnosis can be challenging and often uses several tests together:
- Echocardiogram: Shows how the stiff pericardium affects heart filling and blood flow patterns.
- CT or MRI: Reveal thickening, scarring, or calcium in the pericardium.
- Cardiac catheterization: Measures pressures inside the heart chambers and helps distinguish constriction from similar conditions.
- Chest X-ray: May show calcium deposits around the heart.
- Blood tests: To look for inflammation, infection, or organ effects.
Treatment
Treatment depends on severity and cause:
- Medications: Diuretics help reduce fluid buildup and ease swelling and breathlessness. Anti-inflammatory drugs may help if active inflammation is present.
- Treating the cause: For example, anti-tuberculosis therapy when tuberculosis is responsible.
- Surgery (pericardiectomy): For persistent or severe constriction, surgical removal of the stiff pericardium can relieve the squeezing and is often the definitive treatment.
Some early or inflammatory cases improve with medical treatment alone, while advanced constriction usually requires surgery. The decision to operate weighs the severity of symptoms against the risks of the procedure, and is best made by a team experienced in pericardial disease. After successful treatment, many people see a meaningful improvement in their energy, breathing, and fluid retention over the following weeks and months.
Prevention
Not all cases can be prevented, but risk may be lowered by:
- Fully treating episodes of pericarditis and attending follow-up visits
- Promptly treating infections such as tuberculosis
- Managing autoimmune conditions and kidney disease
- Reporting persistent swelling, fatigue, or breathlessness for early evaluation
When to See a Doctor
See a doctor if you have ongoing leg or abdominal swelling, unexplained fatigue, or shortness of breath, especially after a past episode of pericarditis, heart surgery, or chest radiation. Seek urgent care if you develop:
- Severe or sudden shortness of breath
- Chest pain or pressure
- Fainting or near-fainting
- Rapid weight gain with worsening swelling
Frequently Asked Questions
What is the difference between constrictive pericarditis and a pericardial effusion?
An effusion is a buildup of fluid in the sac around the heart, while constrictive pericarditis is scarring and stiffening of the sac itself. Both can limit the heart's pumping, but the treatments differ: effusions may be drained, whereas severe constriction often needs surgical removal of the pericardium.
Can constrictive pericarditis be cured?
In many people it can be effectively treated. Early or inflammatory cases may improve with medication, and surgery to remove the stiff pericardium (pericardiectomy) can relieve symptoms in advanced cases. Outcomes depend on the underlying cause and overall heart health.
Why does constrictive pericarditis cause leg swelling?
When the stiff sac prevents the heart from filling normally, blood backs up into the veins of the body. This raised pressure pushes fluid into the legs, abdomen, and other tissues, causing swelling, bloating, and weight gain.
Is surgery always needed?
No. Some early cases, especially those with ongoing inflammation, respond to anti-inflammatory medicines and treatment of the cause. Surgery is reserved for persistent or severe constriction that does not improve with medical therapy.
How is it diagnosed?
Doctors combine imaging tests such as echocardiography, CT, or MRI with cardiac catheterization, which measures pressures inside the heart. Together these distinguish constrictive pericarditis from heart failure and other conditions with similar symptoms.
References
- Mayo Clinic. Pericarditis — Symptoms and causes.
- National Heart, Lung, and Blood Institute (NHLBI). Pericarditis.
- MedlinePlus, U.S. National Library of Medicine. Constrictive pericarditis.
- American Heart Association. What Is Pericarditis?