A two year old boy fell off his tricycle, hurting his arm

A two year old boy fell off his tricycle, hurting his arm. He got up and started to cry but before there was any sound he went pale, unconscious and rigid. He recovered after 1-2 minutes but remained pale. After an hour he was back to normal. His mother says she was afraid he was going to die and that he had a
similar episode three months previously after he fell down some steps. What SINGLE investigation is indicated?

  1. A Computed tomography scan of the head
  2. B Electroencephalogram
  3. C Full blood count
  4. D None
  5. E Skeletal survey

Ans:D None