<prompt> Which of the following is associated with MI?Elevation of S waveProlonged QT intervalProlonged PR intervalIncreased amplitude of T wave  <response>: Ref: R. Alagappan Manual for Medicine 4th Edition pg no: 184 ECG May be normal initially and hence serial ECGs must be taken. ST elevation and T-wave inversion with pathological Q-waves are typically seen in leads adjacent to the infarcted segment of myocardium. Reciprocal ST depression or T-wave inversion in opposite leads. A non-Q-wave infarct may occur and has a high risk of moality as they are prone to develop dangerous arrhythmias and recurrent angina. 