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Endocardium – Structure, Function and Diseases

The endocardium is the innermost layer of the heart wall. It lines all four heart chambers and covers the heart valves, playing a vital role in cardiac function.

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Things worth knowing about "Endocardium"

The endocardium is the innermost layer of the heart wall. It lines all four heart chambers and covers the heart valves, playing a vital role in cardiac function.

What is the Endocardium?

The endocardium is the innermost tissue layer of the heart wall. It is a thin, smooth membrane that lines all four chambers of the heart and covers the surface of the heart valves. The endocardium is in direct contact with the blood flowing through the heart and forms the boundary between the cardiac tissue and the bloodstream.

The heart wall consists of three layers: the endocardium (innermost), the myocardium (the heart muscle, middle layer), and the pericardium (outermost layer and sac surrounding the heart). The endocardium is covered by a single layer of endothelial cells, which allow smooth blood flow and perform important regulatory functions.

Structure of the Endocardium

The endocardium is composed of several layers:

Endothelial layer: The outermost layer consists of flat endothelial cells that create a smooth surface and help regulate blood clotting.
Subendothelial connective tissue: Beneath the endothelium lies a layer of loose connective tissue with collagen and elastic fibers that provide structural stability and flexibility.
Deep muscoelastic layer: This innermost layer contains smooth muscle cells and elastic fibers, connecting the endocardium to the underlying myocardium.

Functions of the Endocardium

The endocardium performs several vital functions within the cardiovascular system:

Protective function: It protects the cardiac tissue from direct contact with blood and helps prevent deposits on the heart wall.
Regulation of blood clotting: Endothelial cells produce substances that prevent excessive blood clotting inside the heart.
Mechanical support: The endocardium supports the heart valves and contributes to the orderly flow of blood through the heart.
Signal transmission: It participates in regulating heart muscle contractions by releasing signaling molecules that influence the myocardium.

Diseases of the Endocardium

Endocarditis

The most common disease of the endocardium is endocarditis, an inflammation of the inner lining of the heart. It is usually caused by bacteria that enter the heart through the bloodstream. People with pre-existing heart valve damage or congenital heart defects are at particular risk. Typical symptoms include fever, fatigue, heart murmurs, and in severe cases, heart failure.

Endomyocardial Fibrosis

Endomyocardial fibrosis involves pathological thickening and scarring of the endocardium, which can significantly impair heart function. This condition is more common in tropical regions and leads to stiffening of the heart chambers.

Loeffler Endocarditis

Loeffler endocarditis is a rare condition in which excessive accumulation of eosinophils (a type of white blood cell) causes inflammation and scarring of the endocardium. It is often associated with certain blood disorders or severe allergic reactions.

Diagnosis of Endocardium Diseases

Various diagnostic methods are available to assess the endocardium and diagnose related conditions:

Echocardiography (cardiac ultrasound): The primary imaging method for visualizing the endocardium and heart valves.
Blood tests: Blood cultures to detect pathogens in suspected endocarditis, as well as inflammatory markers such as CRP and ESR.
Magnetic Resonance Imaging (MRI): Provides detailed visualization of the layers of the heart wall.
Heart biopsy: In rare cases, a tissue sample is taken from the endocardium to determine the cause of disease.

Treatment of Endocardium Diseases

Treatment depends on the underlying condition:

Endocarditis: Typically treated with several weeks of antibiotic therapy. In cases of severe heart valve damage, surgical repair or valve replacement may be necessary.
Endomyocardial fibrosis: Treatment includes medications for symptom relief and, in advanced cases, surgical removal of the fibrotic tissue.
Loeffler endocarditis: Managed with corticosteroids and, if needed, additional immunosuppressive medications.

References

Habib, G. et al. - 2015 ESC Guidelines for the management of infective endocarditis. European Heart Journal, 2015; 36(44): 3075-3128.
Schoen, F.J. - The Heart. In: Kumar V. et al. (eds.), Robbins and Cotran Pathologic Basis of Disease. 10th edition, Elsevier, 2021.
World Health Organization (WHO) - Cardiovascular diseases (CVDs). Fact sheet, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)

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