A client receives a diagnosis of bipolar I disorder, current episode depressed. A physician ...

A client receives a diagnosis of bipolar I disorder, current episode depressed. A physician prescribes paroxetine (Paxil) for the client. The client is encouraged to participate in unit activities and to talk about her feelings.
 
  Despite all efforts, the client's depression becomes profound. The client is in total despair and is in a vegetative state. The physician obtains consent to perform electroconvulsive therapy (ECT). What is the rationale behind this treatment for profound depression?
  A) The client is made to forget painful memories from the past and to go on with her life.
  B) The treatment causes stimulation of the central nervous system (CNS) similar to CNS stimulant medication, thereby lifting mood.
  C) The treatment satisfies the need for punishment that severely depressed clients sometimes think they deserve.
  D) The treatment is thought to increase levels of norepinephrine and serotonin, resulting in mood elevation.