What is the sensitivity and specificity of electrocardiography findings in diagnosis of pericarditis.

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Spodick D. Diagnostic electrocardiographic sequences in acute pericarditis. Significance of PR segment and PR vector changes. Circulation. 1973 Sep;48(3):575-80.
Retrospective study, n=50

Surawicz B. Electrocardiogram in pericarditis. Am J Cardiol. 1970 Nov;26(5):471-4.
Retrospective study, n=31

Ginzton LE. The differential diagnosis of acute pericarditis from the normal variant: new electrocardiographic criteria. Circulation. 1982 May;65(5):1004-9.
Retrospective study, n=39 (19 acute pericarditis, 20 normal)