<prompt> Which of the following is the commonest side effect of the procedure shown below?Neck stiffnessPersistent clonusRetrograde amnesiaArrhythmia  <response>: Adverse Effects of ECT A. Memory disturbances: it is the most common side effect of ECT. Both retrograde andanterograde amnesia is seen.retrograde amnesia is much more common.B. Headache, muscle aches, fractures very rare with modifiedECT, nausea and vomiting. 