Pericardial tamponade
A life-threatening situation in which there is such a large amount of fluid (usually blood) inside the pericardial sac around the heart that it interferes with the performance of the heart. The end result, if untreated, is low blood pressure, shock and death. The excess fluid in the pericardial sac acts to compress and constrict the heart. The word “tamponade” is direct from the French. The French verb “tamponner” means to plug up and, also, to smash into. Here the outpouring of fluid within the pericardial sac is, so to speak, smashing into the heart. Pericardial tamponade can be due to excessive pericardial fluid, a wound to the heart, or rupture of the heart. Also called cardiac tamponade.
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Inflammation of the lining around the heart (the pericardium) that causes chest pain and accumulation of fluid around the heart (pericardial effusion). There are many causes of pericarditis, including infections, injury, radiation treatment, and chronic diseases.
- Pericardium, parietal
The tough, thickened outer layer of the pericardium. The parietal pericardium loosely cloaks the heart and is attached to the central part of the diaphragm and the back of the breastbone.
- Pericardium, visceral
The double inner layer of the pericardium. One layer of the visceral pericardium closely adheres to the heart, and the other lines the inner surface of the outer (parietal) pericardium. The intervening space is filled with pericardial fluid. Also known as epicardium.
- Pericentric chromosome inversion
A basic type of chromosome rearrangement in which a segment that includes the centromere (and is therefore pericentric) is snipped out of a chromosome, inverted, and inserted back into the chromosome. The feature that makes it pericentric is that the breaks are on both sides of the centromere.
- Perichondrial
Having to do with the perichondrium, the membrane that surrounds cartilage.