Mondo Description Acute compression of the heart caused by increased intrapericardial pressure due to the collection of blood or fluid in the pericardium from rupture of the heart, penetrating trauma, or progressive effusion.

Disease Ontology Description A pericardial effusion in which fluid accumulates in the pericardium (the sac in which the heart is enclosed) and the pericardial spaces fills up faster than the pericardial sac can stretch.