What does a high T wave mean?

As a medical professional with expertise in cardiology, I can explain the significance of high T waves in an electrocardiogram (ECG) reading. High or "hyperacute" T waves are a specific pattern seen on an ECG that can indicate a serious condition. When T waves are broad, asymmetrically peaked, and appear very tall and pointed, this pattern is often associated with the early stages of a **ST-elevation myocardial infarction (STEMI)**. This is a type of heart attack where a coronary artery is completely blocked by a clot, and it is a medical emergency requiring immediate treatment. The appearance of hyperacute T waves typically precedes the development of other ECG changes, such as ST segment elevation and the appearance of Q waves, which are also indicative of a heart attack. Additionally, this pattern can be seen in a condition known as Prinzmetal's angina, which is a form of unstable angina that can also lead to a heart attack. It's important to note that while the presence of hyperacute T waves can be a sign of a serious cardiac event, it is not a definitive diagnosis on its own. A healthcare provider would need to consider the patient's symptoms, medical history, and other diagnostic tests to confirm the diagnosis and determine the appropriate course of treatment.

Hyperacute T waves. Broad, asymmetrically peaked or 'hyperacute' T-waves are seen in the early stages of ST-elevation MI (STEMI) and often precede the appearance of ST elevation and Q waves. They are also seen with Prinzmetal angina.