Question

What is pericardial effusion?

Answer 1

Pericardial effusion ("fluid around the heart") is an abnormal accumulation of fluid in the pericardial cavity. Because of the limited amount of space in the pericardial cavity, fluid accumulation leads to an increased intrapericardial pressure which can negatively affect heart function

Answer 2

Pericardial effusion is the excess flow of fluid between the heart and the sac around it.