When fluid collects gradually in a pericardial effusion, the pericardium stretches to accommodate the fluid without compressing the heart.

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Quizplus · Accepted Answer

If an effusion develops gradually, the pericardium can stretch to accommodate large quantities of fluid without compressing the heart. If the fluid accumulates rapidly, however, even a small amount (50 to 100 ml) may cause serious tamponade.

When Fluid Collects Gradually in a Pericardial Effusion, the Pericardium