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Pericardial Fluid – Function, Effusion & Treatment

Pericardial fluid is the natural fluid surrounding the heart inside the pericardial sac. An excess can indicate underlying medical conditions.

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Things worth knowing about "Pericardial Fluid"

Pericardial fluid is the natural fluid surrounding the heart inside the pericardial sac. An excess can indicate underlying medical conditions.

What Is Pericardial Fluid?

Pericardial fluid is a clear, serous fluid found within the pericardium – the two-layered fibrous sac that encloses the heart. The space between the two layers is called the pericardial cavity. Under normal physiological conditions, approximately 15 to 50 millilitres of fluid are present in this cavity, acting as a lubricant to reduce friction during each heartbeat.

Function of Pericardial Fluid

Pericardial fluid serves several important roles in the body:

It minimises friction between the two pericardial layers during cardiac contractions.
It protects the heart from external mechanical forces.
It helps anchor the heart within the thoracic cavity.
It plays a role in immune defence and cardiac nutrition.

Pericardial Effusion – When Too Much Fluid Accumulates

When an abnormal amount of fluid builds up within the pericardial cavity, this is called a pericardial effusion. The excess fluid can compress the heart externally and significantly impair its function. In severe cases, a large pericardial effusion can lead to a life-threatening cardiac tamponade, in which the heart is unable to pump effectively.

Causes of Pericardial Effusion

Pericarditis: Inflammation of the pericardial sac, often triggered by viral infections
Infections: Bacterial, viral, or fungal
Autoimmune diseases: Such as systemic lupus erythematosus or rheumatoid arthritis
Myocardial infarction or cardiac surgery
Malignancies: Metastatic disease or primary pericardial tumours
Renal failure: Uraemic pericardial effusion
Hypothyroidism: Underactive thyroid gland
Chest trauma or injuries

Symptoms

Small pericardial effusions often cause no symptoms. Larger effusions may present with:

Chest pain, often worsened by breathing or lying down
Shortness of breath and dyspnoea
Palpitations or irregular heartbeat
Hiccups, hoarseness, or difficulty swallowing due to pressure on adjacent structures
Fatigue and general weakness
In severe tamponade: low blood pressure, shock, or loss of consciousness

Diagnosis

The diagnosis of a pericardial effusion is primarily established through imaging:

Echocardiography: Cardiac ultrasound is the most reliable method for detecting pericardial fluid.
Chest X-ray: May reveal an enlarged cardiac silhouette.
ECG: Can show characteristic findings such as low-voltage complexes or electrical alternans.
CT or MRI: Provides more detailed information about the cause and extent of the effusion.
Laboratory tests: Including full blood count, inflammatory markers, renal function, and thyroid levels.

Treatment

Treatment depends on the underlying cause and severity of the effusion:

Medical therapy: Anti-inflammatory drugs such as ibuprofen, colchicine, or corticosteroids for inflammatory causes.
Treatment of the underlying condition: For example, antibiotics for bacterial infection or thyroid hormone replacement for hypothyroidism.
Pericardiocentesis: Needle aspiration to drain the effusion, particularly when haemodynamic compromise is present or for diagnostic purposes.
Surgical intervention: In rare cases, a pericardial window or pericardiectomy may be required.

References

Adler, Y. et al. - 2015 ESC Guidelines for the Diagnosis and Management of Pericardial Diseases. European Heart Journal, 36(42), 2921-2964.
Imazio, M. & Gaita, F. - Diagnosis and Treatment of Pericarditis. Heart, 101(14), 1159-1168, 2015.
Kasper, D. L. et al. - Harrison's Principles of Internal Medicine, 20th Edition. McGraw-Hill Education, 2018.

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