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| pericardium | |
|---|---|
| Name | Pericardium |
| Latin | pericardium |
| System | Circulatory system |
| Location | Thorax |
| Partof | Heart |
pericardium The pericardium is a fibroserous sac enclosing the heart and the roots of the great vessels, providing mechanical protection, limiting acute cardiac dilation, and facilitating lubrication. It sits within the middle mediastinum, interacting with neighboring structures such as the lungs, diaphragm, and pleura while contributing to cardiac hemodynamics and immunologic responses. Study of the pericardium intersects clinical disciplines and historical developments in anatomy and surgery, from early dissections in Renaissance Italy to modern imaging and cardiac surgery.
The sac comprises an outer fibrous layer and an inner serous layer; the fibrous component is continuous with connective tissues surrounding the aorta, pulmonary trunk, and central tendon of the diaphragm, and it anchors to the sternum and mediastinal pleura. The serous pericardium divides into a parietal layer lining the fibrous shell and a visceral layer adherent to the epicardium of the heart, creating the pericardial cavity that contains a normal small volume of lubricating fluid. Anatomical relations include proximity to the left lung, right lung, and structures within the mediastinum, while vascular supply arises from branches of the internal thoracic artery, pericardiacophrenic artery, and contributions from the coronary arteries; venous drainage links to mediastinal veins and lymphatics communicating with the thoracic duct.
Mechanically, the pericardial sac provides restraint against acute chamber distension during volume loading, contributing to ventricular interdependence observed during physiological maneuvers such as those used in cardiac catheterization and exercise testing. The lubricating pericardial fluid reduces friction during cardiac cycles, and pericardial pressure-volume relations influence cardiac filling and intracardiac pressures measured in hemodynamic studies such as those referenced in Swan-Ganz catheterization literature. Immunologically, the pericardium participates in local inflammatory and fibrotic responses mediated by cytokines and mesothelial cell signaling studied in research centers including Mayo Clinic, Cleveland Clinic, and university departments like Johns Hopkins University School of Medicine.
Embryologically, the fibrous and serous components derive from the mesodermal layers associated with the developing cardinal veins and the splanchnic mesoderm that forms the cardiac tube; separation of the pericardial and pleural cavities occurs with formation of pleuropericardial folds influenced by nerves such as the phrenic nerve. Congenital anomalies of pericardial development correlate with syndromes and embryologic defects cataloged in pediatric cardiology centers like Great Ormond Street Hospital and registries maintained by European Society of Cardiology pediatric sections. Key historical embryologists whose work informed current understanding include Marcello Malpighi and later investigators at institutions such as Harvard Medical School.
Pericardial disease encompasses acute and chronic presentations including viral and bacterial pericarditis, autoimmune-mediated pericardial inflammation, hemorrhagic effusion from trauma or malignancy, constrictive pericarditis leading to diastolic heart failure, and cardiac tamponade as an emergency requiring rapid recognition. Etiologies involve pathogens like Mycobacterium tuberculosis and organisms documented by centers such as Centers for Disease Control and Prevention, paraneoplastic processes observed in cancers treated at Memorial Sloan Kettering Cancer Center, and iatrogenic causes from procedures at academic hospitals including Massachusetts General Hospital. Historical epidemics and notable case series published through organizations such as the World Health Organization have shaped guidelines from professional bodies including the American Heart Association.
Evaluation begins with clinical examination and electrocardiography as outlined by protocols from European Society of Cardiology and American College of Cardiology, with chest radiography demonstrating silhouette changes in effusion and cardiomegaly. Echocardiography—transthoracic and transesophageal—is the primary imaging modality used in hospitals like Mount Sinai Health System and is complemented by computed tomography performed at centers such as Mayo Clinic and magnetic resonance imaging developed in research at National Institutes of Health; these modalities assess effusion volume, pericardial thickness, constriction, and hemodynamic impact. Invasive hemodynamic assessment via cardiac catheterization can distinguish constriction from restrictive cardiomyopathy in tertiary referral centers including Cleveland Clinic.
Management ranges from anti-inflammatory therapy guided by trials from institutions like Brigham and Women’s Hospital to invasive procedures: pericardiocentesis performed emergently in emergency departments affiliated with Johns Hopkins Hospital and pericardial window or pericardiectomy performed by cardiothoracic surgery teams at Royal Brompton Hospital and university programs such as Stanford Health Care. Techniques include subxiphoid pericardiostomy, video-assisted thoracoscopic pericardial resection developed in centers like Guy's and St Thomas' NHS Foundation Trust, and radical pericardiectomy for chronic constriction with outcomes reported in multicenter registries coordinated by societies such as the European Association for Cardio-Thoracic Surgery.
Category:Cardiovascular anatomy