A client reports having crushing chest pain that radiates to the jaw. The nurse obtains a 12-lead EKG. Which finding confirms the client had myocardial infarction?

A. ST segment depression: ST segment depression typically indicates myocardial ischemia, but ST segment elevation, especially in contiguous leads, is the classic EKG finding confirming an acute myocardial infarction (MI). Persistent ST changes correlate with myocardial injury, helping to localize the infarcted area. B. Wide QRS complex: A widened QRS complex suggests conduction abnormalities such as bundle branch block or ventricular arrhythmias. While these can accompany MI, they do not confirm the diagnosis on their own. C. Absent P wave: Absence of the P wave indicates atrial fibrillation or other atrial conduction disturbances. This finding reflects arrhythmias rather than myocardial infarction and is not diagnostic of MI. D. Peaked T wave: Tall, peaked T waves are an early indicator of hyperkalemia or acute ischemia but are nonspecific. While they can appear in early MI, they do not definitively confirm myocardial infarction without corresponding ST segment changes or enzyme elevations.