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</html><description>Air or gas in sac containing the heart.Accumulation of air between the two layers of pericardium; it is most often caused by penetrating trauma (e.g., gunshot or knife wound) and may require pericardiocentesis to dram the air.Air or gas in the pericardial sac; caused by trauma or pathological communication between the esophagus, stomach, or lungs and the pericardium. On examination one finds unusual metallic heart sounds and tympany over the precordial area.The presence of air within the pericardium.</description></oembed>
