Psychotic depression: State-of-the-art algorithm improves odds for remission
Consider an antipsychotic, even when paranoia or cognitive changes are more obvious than delusions or hallucinations.
Psychotic depression requires a unique antidepressant approach, but how can you be sure that a patient’s major depression has psychotic features? Delusions or hallucinations—psychotic depression’s hallmarks—may not be obvious.
This article describes how to detect the distinctive diagnostic signs of psychosis in a patient with a major depressive episode. We offer a treatment algorithm for:
- choosing between electroconvulsive therapy (ECT) and medication
- safely combining antidepressant and antipsychotic agents
- addressing partial or nonresponse to ECT or medications.
Psychotic or nonpsychotic?
Similar clinical presentations make it difficult to distinguish psychotic depression from nonpsychotic depression, schizophrenia spectrum disorders, bipolar disorder, posttraumatic stress disorder (PTSD), obsessive-compulsive disorder (OCD), and body dysmorphic disorders. Comorbid substance abuse/dependency disorders can also complicate psychotic depression’s clinical manifestations and outcomes.
Because delusions and hallucinations are often subtle, researchers have sought other symptoms to differentiate psychotic from nonpsychotic depression. For example, patients with psychotic depression are more likely to exhibit paranoia1 (Table 1), which may explain their underreporting of symptoms.
Table 1
Diagnostic characteristics of psychotic depression
| DSM-IV hallmark symptoms |
| Delusions or hallucinations in the context of a depressive episode |
| More subtle symptoms may include: |
|
Using the Hamilton Rating Scale for Depression (HRSD), Frances and colleagues2 compared 64 depressed patients (34 with psychotic features and 30 without). On the scale’s paranoia item, the psychotic group’s mean score was 1.10, compared with 0.15 for those without psychosis (p = 0.01).
Family history and clinical course. Some studies suggest that first-degree relatives of patients with psychotic depression may have elevated rates of depression and the psychotic subtype.3 Patients with psychotic depression typically suffer morefrequent relapses or recurrences and therefore:
- use more psychiatric services
- are more disabled
- have a poorer clinical course.4
Suicide risk. Psychotic depression is associated with increased risk of self-harm and hospitalization compared with nonpsychotic depression. Patients hospitalized for a major depressive episode are five times more likely to commit suicide if they show evidence of delusions.5
Social impairment. Patients with psychotic depression often have “troubled” lives, with difficult marital and parental relationships, residential instability, inadequate support networks, and low economic status. These problems may be related to subtle cognitive deficits caused by hypothalamic-pituitary-adrenal (HPA) axis disturbance and elevated cortisol levels.6
Confronting similar presentations
Using the BPRS. The Brief Psychiatric Rating Scale (BPRS) is a useful tool to differentiate psychotic depression from nonpsychotic depression. It can flag symptoms such as suspiciousness, grandiosity, and somatization that even a seasoned psychiatrist might miss. The BPRS also points out:
- Any sign of psychosis is sufficient to designate major depression as “psychotic.”
- One well-developed diagnostic sign is sufficient to warrant treatment for psychotic depression.
Schizophrenia spectrum disorders. When psychosis is prominent (particularly in young adults), differentiating schizophrenic spectrum disorders from psychotic depression can be extremely challenging. Although few biological differences have been documented, patients with psychotic depression and schizophrenia differ in HPA axis activity and all-night sleep electroencephalogram readings.7
When the diagnosis is unclear, maintain a high index of suspicion for psychotic depression and its subtleties, and schedule frequent follow-up appointments.
Conversion to bipolar disorder. Adolescents diagnosed with unipolar major depression are at risk for converting to bipolar disorder, particularly if their depression includes psychotic features. In 60 hospitalized adolescents diagnosed with unipolar depression, a 20% conversion rate to bipolar disorder was predicted in part by a cluster of depressive symptoms:
- mood-congruent psychotic features (75% of converters vs. 6% of nonconverters, p< 0.001)
- psychomotor retardation
- rapid symptom onset.8
A similar study reported a 20% conversion rate to bipolar disorder in 206 adolescent outpatients diagnosed with unipolar depression.9 Psychotic depression was more common in converters (42%) than in nonconverters (15%).
Anxiety disorders—such as PTSD or OCD—can be difficult to distinguish from psychotic depression when they present with sensory disturbance.
When in doubt, explore:
- obsessions
- intrusive thoughts
- psychomotor behaviors
- fear of certain external events or people without consistent cues from reality.
PTSD and psychotic depression are not mutually exclusive; a patient may have both.10
Body dysmorphic disorder. Body image concerns correlate with poor self-esteem and depression.11 According to DSM-IV criteria, an individual with body dysmorphic disorder displays excessive concern over an imagined or slight defect, and this concern causes substantial distress or functional impairment. The concern also is not better accounted for by another mental disorder, such as psychotic depression or an eating disorder.
The body is often a focus of psychotic depression’s delusions. During depressive episodes, a patient may have a frank belief about a body part that is not consistent with reality. The history may include negative medical workups or preoccupation with having a serious illness.
