Clinical presentation: usually a sudden onset of retrosternal chest pain with a pleuritic component to it, often relieved by sitting up. You may hear a pericardial rub - this is classically described as a triphasic, high-pitched sound. The 'tri' refers to 1. atrial systole, 2. ventricular systole, and 3. ventricular diastole. It may be a transient phenomenon so listen again if you don't hear it.
ECG: may show diffuse, concave ST elevations that do not fit any particular vascular territory. PR depression is also seen. Check out the ECG above.
Treatment: In most cases of idiopathic pericarditis, high dose NSAIDS are effective. Steroids and colchicine also may have a role. Interestingly, newer evidence suggests that colchicine may be a good first line agent (http://www.circ.ahajournals.org/cgi/content/full/112/13/2012).
A great review article: http://content.nejm.org/cgi/content/full/351/21/2195
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