Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content +++ ECG Findings ++ ST segment depression ≥ 1 mm in consecutive leads. ST segments may be horizontal or downsloping. +++ Pearls ++ Some ST depression in the lateral precordial leads (V4-V6) is common at higher heart rates and is commonly seen during exercise treadmill tests, but such depression should not be downsloping unless ischemia is also present. ST elevation in other leads suggests that the depression may represent reciprocal changes from acute injury rather than subendocardial ischemia. Downsloping ST depression may also be seen in left ventricular hypertrophy (LVH), but this depression should not be dynamic and should be stable with serial ECGs. ST depression from ischemia will be dynamic, changing with time on serial ECGs. Isolated ST depression in leads V1 and V2 may represent posterior ischemia. ++ FIGURE 23.8A Subendocardial Ischemia. (ECG contributor: James V. Ritchie, MD.) Graphic Jump LocationView Full Size||Download Slide (.ppt) ++ FIGURE 23.8B Downsloping ST segments depressed greater than 1 mm (arrow). These changes were dynamic over time. The patient sustained a nontransmural myocardial infarction. Graphic Jump LocationView Full Size||Download Slide (.ppt) Your Access profile is currently affiliated with [InstitutionA] and is in the process of switching affiliations to [InstitutionB]. Please select how you would like to proceed. Keep the current affiliation with [InstitutionA] and continue with the Access profile sign in process Switch affiliation to [InstitutionB] and continue with the Access profile sign in process 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 Error: Incorrect UserName or Password Username Error: Please enter User Name Password Error: Please enter Password Sign in Forgot Password? Forgot Username? Download the Access App: iOS | Android Sign in via OpenAthens Sign in via Shibboleth You already have access! Please proceed to your institution's subscription. Create a free profile for additional features.