Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content +++ ECG Findings ++ Tall, often domed T waves. T waves have asymmetric appearance. T waves will often have a broad base. +++ Pearls ++ Hyperacute T waves occur very early during myocardial injury and are transient. The term “hyperacute T waves” is reserved for the early stages of MI. The presence of prominent T waves appearing to be “hyperacute” (ie, indicative of ischemia) is somewhat nonspecific and can also be found in patients with LVH, early repolarization, hyperkalemia, and a few other conditions. However, serial ECGs are useful in distinguishing ischemic T waves from other causes of prominent T waves. In the presence of ischemia, the ECG is likely to show evolving changes, thus confirming that the prominent T wave is a sign of ischemia. In the other conditions, evolving changes are less likely. ++ FIGURE 23.9A Hyperacute T Waves. T waves in a patient with acute myocardial ischemia. (ECG contributor: James V. Ritchie, MD.) Graphic Jump LocationView Full Size||Download Slide (.ppt) ++ FIGURE 23.9B T waves (double arrow) are large in proportion to the QRS complex. The height was transient and was significantly diminished in a serial tracing obtained 15 minutes later. Note also in the 12-lead ECG example above the presence of inferior ST elevation. 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 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 Password? Forgot Username? Sign in via OpenAthens Sign in via Shibboleth