Acute pericarditis. ST-segment elevation with concave upward curvature is seen in leads I, II, aVL, aVF, and V2-6. Reciprocal ST-segment depression is seen in cavity lead aVR. (Reproduced, with permission, from Goldschlager N, Goldman MJ. Principles of Clinical Electrocardiography, 13th ed. Originally published by Appleton & Lange. Copyright © 1989 by The McGraw-Hill Companies, Inc.) Source: Heart Disease, Current Medical Diagnosis & Treatment 2017 Citation: Papadakis MA, McPhee SJ, Rabow MW. Current Medical Diagnosis & Treatment 2017; 2016 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1843/cmdt17_ch10_ef110a.png&sec=135707553&BookID=1843&ChapterSecID=135705950&imagename= Accessed: December 22, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved