What shape is indicative of a positive current of injury?

A shark fin shape on an electrocardiogram (ECG) is particularly indicative of a positive current of injury. This pattern typically represents acute myocardial injury, often seen in conditions such as myocardial infarction or injury to the myocardial tissue. The elevated and pointed appearance of the shark fin shape results from the altered electrical activity in the heart, where a section of the myocardium is depolarized and remains in a pathophysiological state, causing a distinctive upward curve on the ECG tracing.

In the context of current of injury, the shark fin shape illustrates that there is an abnormal electrical force at play, reflective of tissue undergoing damage or ongoing ischemia. This characteristic elevation signifies that the heart is responding to injury, making it a critical component for clinicians to recognize in diagnosing potential cardiac events.