DSM-IV has implemented a major change in the classification of psychiatric symptoms caused by medical conditions. The previous terminology of "organic brain syndrome" and the subtypes organic mood disorder, organic delusional disorder, for example, have been eliminated because of the implication that the "functional" mental disorders were unrelated to biologic changes in brain function. Using DSM-IV, where there is evidence that a psychiatric disturbance is a direct physiologic consequence of a general medical condition or substance, the mental disorder is specified as "... due to" the medical problem; for example, "major depression due to hypothyroidism." Common medical causes of psychotic and mood disorders are covered in Chap..281,
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