Persistent depressive disorder
The hallmark symptoms of PDD are depressed mood occurring for at least 2 years along with 2 or more of the following symptoms: change in appetite, insomnia / hypersomnia, fatigue, low self-esteem, feelings of hopelessness, or impaired concentration. The length of time needed for diagnosis is different for children, only requiring at least a year of symptoms. Onset of symptoms often occurs in the teenage years.
Risk factors include parental loss or separation, family history of depression, and the presence of coexisting anxiety disorders or conduct disorders.
Proper screening in the primary care setting should be conducted.
F34.1 – Dysthymic disorder
78667006 – Dysthymia
- Major depressive disorder – This is diagnosed when symptoms have lasted for 2 weeks or more. PDD symptoms require a longer time course.
- Bipolar disorder type 2 (hypomania) – There is no aspect of hypomania included in the PDD diagnosis.
- Cyclothymia – Mood swings are more common in cyclothymic disorder, including episodes of elevated mood and hypomania. In PDD, there is a more constant state of depressed mood without any evidence of hypomania.
- Comorbid psychiatric illnesses should also be considered; PDD can be seen in other disease conditions.