Hyperacute T Waves On ECG

                                              (Click on the image to enlarge)

ECG Findings
• T-wave amplitude/QRS amplitude greater than 75%.
• T waves greater than 5 mV in the limb leads.
• T waves greater than 10 mV in the precordial leads.
• T waves have asymmetric appearance.

Clinical Pearls
1. Hyperacute T waves occur very early (within minutes) during myocardial injury and are transient.
2. The term “hyperacute T waves” is reserved for the early stages of myocardial infarction. “Prominent T waves” can also be seen with LVH, early repolarization, or with hyperkalemia.

3. Serial ECGs are useful in distinguishing transient hyperacute T waves from other causes of tall, peaked T waves.