<prompt> Which of the following ECG findings is associated with acute myocardial InfarctionElevation of S waveProlonged QT intervalTall T waves with increased amplitudeProlonged PR interval  <response>: Answer is C Tall T waves with increased amplitude Acute myocardial infarction is associated with ST segment elevation and tall, positive, hyperacute T waves increased amplitude of T waves. When the acute ischemia is transmural, the ST vector usually is shifted in the direction of outer layers epicardial, producing ST elevation and sometimes in the earliest stages of ischemia, tall, positive so called hyperacute T waves over the ischemic zone 