Arnold Swanson, a 54-Year-Old Janitor of Middletown High School, Suddenly

Arnold Swanson, a 54-year-old janitor of Middletown High School, suddenly felt a crushing chest pain while doing his early chores one morning. He called for his neighbor to drive him to the nearest hospital. Upon arrival in the Emergency Department, the doctor ordered for a 12-lead ECG to determine a possible myocardial infarction. The nurse would know that an early finding in the ECG of a client with an infarcted myocardium would be:

A) Disappearance of QRS complex
B) Elevated ST segments
C) Absence of P wave
D) Flattened T waves