Sections View Full Chapter Figures Tables Videos Full Chapter Figures Tables Videos Supplementary Content +++ ECG Findings ++ Diffuse, concave upward ST elevation ST elevation typically greater in lead II than lead III PR depression in multiple leads (in viral pericarditis) PR elevation and ST depression in lead aVR common (although not specific for pericarditis) T-wave flattening or inversion in late stages Absence of reciprocal changes (with exception of aVR and V1) +++ Pearls ++ Inflammation of the pericardium can cause pericarditis. As the pericardium is circumferential, the ECG changes are most often diffuse. Presence of significant Q waves or reciprocal changes in any leads (with the exception of aVR or V1) should prompt consideration of acute or old MI. Pericarditis may be focal, resulting in regional rather than diffuse ECG changes. ++ FIGURE 23.13A Acute Pericarditis. (ECG contributor: James V. Ritchie, MD.) Graphic Jump LocationView Full Size||Download Slide (.ppt) ++ FIGURE 23.13B ST elevation in noncontiguous leads I and II (arrows) with PR depression (arrowhead). No pathologic Q waves or reciprocal changes are present. Graphic Jump LocationView Full Size||Download Slide (.ppt) Your MyAccess profile is currently affiliated with '[InstitutionA]' and is in the process of switching affiliations to '[InstitutionB]'. Please click ‘Continue’ to continue the affiliation switch, otherwise click ‘Cancel’ to cancel signing in. Get Free Access Through Your Institution Learn how to see if your library subscribes to McGraw Hill Medical products. Subscribe: Institutional or Individual Sign In Username Error: Please enter User Name Password Error: Please enter Password Forgot Username? Forgot Password? Sign in via OpenAthens Sign in via Shibboleth