Assertion: pericarditis's symptom | /r/CapableOf | persist for more than a week
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text: If the symptoms persist for more than a week, your doctors may order an echocardiogram, which can not only determine the amount of fluid in the pericardium, but can also indicate whether the fluid is putting pressure on the heart -- a condition known as cardiac tamponade -- or if the tissue that makes up the pericardium is compromised and becoming stiff (a condition known as constrictive pericarditis)