What type of angina may present with transient ST changes and inverted T waves?

Unstable angina is characterized by varying degrees of ischemia that can occur at rest or with minimal exertion, and it often presents with transient ST segment changes and inverted T waves on an electrocardiogram (ECG). These changes reflect ongoing myocardial ischemia, which is likely due to partial or temporary occlusion of coronary arteries from plaque rupture or other mechanisms.

In unstable angina, the chest pain can be more intense, might last longer than typical stable angina, and may not be relieved by rest or nitroglycerin, distinguishing it significantly in presentation and urgency. This condition may also represent progression toward myocardial infarction, making it a critical clinical scenario that requires immediate assessment and intervention.

The other types of angina present differently; stable angina typically occurs predictably with exertion and resolves with rest or medication, showing no significant ST changes at rest. Prinzmetal angina, which is caused by coronary artery spasm, can also lead to ST segment elevation rather than transient changes or T wave inversions during episodes. Understanding these nuances helps clarify why the recognition of unstable angina's presentation is vital in emergency medicine.