pericarditis Pneumopericardium DOID:113 MESH:D011026 SNOMEDCT:82542004 MedDRA:10048731 Presence of air or gas in the space between the heart and the PERICARDIUM. The degree of respiratory distress depends on the amount of trapped air and circulation blocked in the systemic and pulmonary veins. NCIt:C99019 Sirarat Sarntivijai