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Around my heart: The Pericardium

A two-walled sac hugs my heart (yours, too). The pericardium, aptly named: Peri, or around; Cardion, or heart. The outer layer – fibrous, rigid – bears the brunt of the work. Holds my heart steady to avoid its swings, tethers it in the expanse of my chest cavity. Keeps it from beating right out. orange peel This layer is tough, just enough for safety purposes. Like the hard peel around an orange, it shields my heart. From infections, so prone to developing in nearby lungs. From my heart itself, which could overfill with blood and too big. My heart may be eager, but this fibrous layer knows everything has its limits.

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 Decoding the Pericardium in Chinese Medicine

In Traditional Chinese Medicine (TCM), the Pericardium meridian serves as the protector of the Heart, acting as both a physical and energetic shield against external and internal stressors. As a Yin organ, the Pericardium is deeply linked to emotional well-being, particularly in the realm of relationships and intimacy. When this meridian is in balance, it fosters emotional warmth, connection, and a sense of security in relationships.

Articles of Interest

An Overview of the Pericardium

The pericardium is a double-layered sac that surrounds and protects the heart, playing a crucial role in maintaining the heart’s position within the chest and reducing friction between the heart and surrounding structures as it beats.

Anatomy of the Heart: Pericardium

Disorders like pericarditis, pericardial effusion, and cardiac tamponade can affect the pericardium and heart function.

Epicardium vs Pericardium: Know the Differences

While their names share a root, Epicardium and Pericardium are different components of the heart's protective membrane. The pericardium, a sac-like tissue, acts as a knight's armour for the heart. Its two major layers provide a dual tier of defence. The fibrous pericardium is the heart's outer covering, which provides structural support and protects it from external forces. In contrast, the inner layer, the serous pericardium, has a considerably more fragile and divided structure. The parietal pericardium creates the sac's outside lining and adheres to the fibrous pericardium. But the narrative does not stop there. The serous layer folds back on itself, forming a thin layer known as the epicardium that is in direct touch with the heart muscle. So, the epicardium is just an extension of the pericardium, forming a close embrace around the heart itself.

Exploring the Vital Role of Pericardium

It goes without saying that the heart is the most essential organ in the human body. However, did you ever think of the protective casing that takes care of the heart? No, right? The pericardium is the sac that works like a protective casing for the human heart. It ensures that the circulatory system works seamlessly by working with organs like the septum that prevent the mixing of oxygenated and deoxygenated blood during circulation and valves that prevent the backflow of blood in the heart in harmony. The pericardium has a multitude of roles to play in the body. Circulation is only a single example, but no function of the human heart would be possible without the presence of the pericardium. It is an under-talked face of the human heart that needs more discussion among healthcare enthusiasts and clinicians. Therefore, this blog will do the needful for you.

Pericardial Disease: Value of CT and MR Imaging

The pericardium represents an important focus of morbidity and mortality in patients with cardiovascular disease. Fortunately, in recent years knowledge regarding this enigmatic part of the heart and the diagnosis of related diseases has substantially advanced. To a large extent, this can be attributed to the availability of several noninvasive cardiac imaging modalities. Transthoracic echocardiography, which combines structural and physiologic assessment, is the first-line technique for examination of patients suspected of having or known to have pericardial disease; however, cardiac computed tomography (CT) and magnetic resonance (MR) imaging are becoming increasingly popular for the study of this part of the heart.

Pericardium

Imagine that you have a football bladder filled with oil. The neck is untied and you press your fist downwards on to the bladder so that the oil runs out. When all but the last few drops have flowed away your fist will be surrounded on all sides and underneath by two layers of rubber which will slide easily on each other because of the small amount of oil that is left. Now, if you pretend that your fist is your heart, the two layers of the football bladder will be like the two layers of the pericardium which surround it. At the top, your wrist will represent the large blood vessels which carry blood to and from the heart. The few drops of oil in the bladder will be the fluid between the two layers of pericardium which allows the layers to slide easily on each other. Although the outer layer of the pericardium is attached to the nearby tissues, the inner layer attached to the heart can slide on it quite easily, and so allow the heart to beat freely.

The pericardium forms as a distinct structure during heart formation

Mesothelia such as the pericardium have been implicated in contributing to a variety of downstream cell fates including select tissue fibroblast lineages, yet the lineage connectivity and clonality of mesothelial progenitor cells remain vastly unknown.

The Role of the Pericardium in Heart Failure

The elastic pericardium exerts a compressive contact force on the surface of the myocardium that becomes more substantial when heart volume increases, as in patients with various forms of heart failure (HF). Pericardial restraint plays an important role in determining hemodynamics and ventricular function in both health and disease.

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KenHub

The pericardium is very rarely affected by an isolated pathological process, but rather it is affected by processes primarily occurring within nearby structures. In clinical practice, you will mostly deal with pericardial effusions and inflammation (pericarditis). The amount of serous pericardial fluid between the serous layers has a physiological range 15 - 50 milliliters. In some cases, the amount of pericardial fluid can exceed this range.

Physiopedia

The pericardium is a protective, fibroserous sac that encloses the heart and its great blood vessels. It is located in the middle mediastinum, behind the body of the sternum and the 2nd–6th costal cartilages, and in front of the T5 to T8 thoracic vertebrae.

Radiopaedia

The pericardium is made of two sacs in one. The outer sac is the fibrous pericardium, and the inner sac is the double-layered serous pericardium. Layers of serous pericardium are divided by the pericardial space, which only contains 15-50 mL of serous fluid 10. Each layer has quite a different structure and functions (from external to internal):

StatPearls

The pericardial sac positions the heart in the mediastinum and limits its motion while providing a lubricated slippery surface for the heart to beat inside and the lungs to move outside. The pericardium prevents the excessive dilatation of the heart, and in pathological states, it can limit the overfilling of the heart, which would result in low cardiac output. It also influences the pressure-volume relationships of cardiac chambers by providing limited space for the heart as a whole. The pericardium also equalizes hydrostatic, inertial, and gravitational forces maintain the geometry of the left ventricle, and acts as a mechanical barrier to infection.

TeachMe Anatomy

If the heart is the fun, interesting inside bit of an orange, the pericardium could be compared to the peel around it. Like peel, it can seem vaguely unexciting – that is until you learn some of its very important (appeeling. ahem.) physiological functions In scientific terms, the pericardium is a fibro-serous, fluid-filled sack that surrounds the muscular body of the heart and the roots of the great vessels (the aorta, pulmonary artery, pulmonary veins, and the superior and inferior vena cavae).

Thoracic Key

In normal hearts, the pericardium should be considered as only a potential space. It contains 20–60 mL of pericardial fluid, most of which resides in the major pericardial sinuses and the atrioventricular grooves.