What EKG findings are indicative of NSTEMI?

In the context of NSTEMI (Non-ST-Elevation Myocardial Infarction), the typical EKG findings are ST depression and T wave inversion. These changes indicate myocardial ischemia, which may occur during conditions like NSTEMI when blood flow to the heart muscle is reduced but not completely obstructed.

ST depression suggests a subendocardial ischemia, while T wave inversion reflects changes in the ventricular repolarization process associated with ischemic conditions. These findings are significant as they support the diagnosis of NSTEMI, distinguishing it from STEMI (ST-Elevation Myocardial Infarction), where ST elevation and Q waves would be more prevalent.

In contrast, the other options entail different scenarios: Q waves and ST elevation are typically associated with STEMI, indicating a complete obstruction of blood flow and significant myocardial damage. No significant changes on the EKG would suggest that there's no acute myocardial ischemia, while a prolonged QT interval, although important in other contexts, does not directly indicate NSTEMI. Understanding these changes is crucial for timely and accurate diagnosis and management of myocardial infarction.