Risk Factors
Identifying high-risk individuals is crucial for prevention and early intervention. Key risk factors include:
- Demographics: Being female, middle-aged, or living in a rural area with low-income status.
- Life Circumstances: Being widowed, separated, or divorced.
- Clinical History: Having a family history of depression, a personal history of prior depressive episodes, or having other concurrent mental health conditions.
- Medical Factors: The presence of chronic medical conditions.
Major Depressive Disorder (MDD): DSM-5-TR Criteria
To diagnose Major Depressive Disorder (MDD), a patient must meet specific criteria outlined in the DSM-5-TR. A major depressive episode requires at least five symptoms to be present during the same two-week period, and at least one of the symptoms must be either (1) depressed mood or (2) loss of interest or pleasure.
The SIGECAPS Mnemonic
Students often use the SIGECAPS mnemonic to remember the nine diagnostic symptoms of MDD:
- Sleep: Insomnia or hypersomnia.
- Interest: Anhedonia (significant loss of interest or pleasure).
- Guilt: Feelings of worthlessness or excessive/inappropriate guilt.
- Energy: Fatigue or loss of energy.
- Concentration: Diminished ability to think or indecisiveness.
- Appetite: Significant increase or decrease in appetite (or weight changes).
- Psychomotor: Agitation or retardation (observable by others).
- Suicide: Recurrent thoughts of death, suicidal ideation, or suicide attempts.
Note on Mood: In children and adolescents, "depressed mood" may present as irritability.
Diagnostic Requirements
Beyond the symptom count, two other criteria must be met:
- Impairment: The symptoms must cause significant distress or impairment in social, occupational, or other important areas of functioning.
- Exclusion: The episode must not be attributable to the physiological effects of a substance or another medical condition.
Clinical Course and Prognosis
The course of MDD can be unpredictable. Onset may be sudden or gradual, and the duration can vary from short to long. MDD can be a single episode or recurrent, with periods of remission in between.
The Risk of Recurrence
MDD is often a recurring illness. The probability of relapse increases significantly with each subsequent episode:
- After 1st episode: 50% chance of recurrence.
- After 2nd episode: 70% chance of relapse.
- After 3rd episode: 90% chance of relapse.
Complications
The most serious complication of MDD is suicide. It is estimated that 10%–15% of patients hospitalized for depression will eventually complete suicide. Furthermore, MDD is associated with increased medical morbidity and mortality, including links to cardiovascular disease (CAD/heart failure/HTN), diabetes, Parkinson disease, and cerebrovascular accidents (CVA).
DSM-5-TR Specifiers
Specifiers are used to provide more detail about the depressive episode, which can help determine specific treatments and predict clinical outcomes.
| Specifier | Key Features |
|---|
| Melancholic | Loss of pleasure in almost all activities; lack of mood reactivity (doesn't feel better when something good happens); often includes early morning awakening and excessive guilt. |
| Atypical | Mood reactivity (mood brightens with positive events); accompanied by hypersomnia, weight gain, "leaden paralysis," or interpersonal rejection sensitivity. |
| Peripartum Onset | Onset during pregnancy or within 4 weeks postpartum. |
| Seasonal Pattern | Symptoms occur in relation to changes in seasons (typically fall/winter) and remit in spring; often treated with light therapy. |
| Psychotic Features | Presence of delusions or hallucinations during the episode. |
| Catatonia | Includes stupor, waxy flexibility, mutism, negativism, or echolalia. |
Other Depressive Disorders
While MDD is the most commonly discussed, the DSM-5-TR includes several other distinct depressive disorders:
- Persistent Depressive Disorder (Dysthymia): A chronic form of depression.
- Disruptive Mood Dysregulation Disorder (DMDD): Primarily characterized by severe, recurrent temper outbursts and chronic irritability.
- Premenstrual Dysphoric Disorder: Depressive symptoms occurring in the luteal phase of the menstrual cycle.
- Substance/Medication-Induced Depressive Disorder: Depression caused by the physiological effects of a drug or medication.
Treatment Modalities
Treatment for depressive disorders is often multi-modal, combining biological and psychological approaches.
Psychotherapy
Several forms of psychotherapy are effective:
- Cognitive Behavioral Therapy (CBT): Focuses on changing negative thought patterns and behaviors.
- Interpersonal Therapy (IPT): Focuses on resolving interpersonal difficulties in four specific areas:
- Grief: Dealing with the loss of a loved one.
- Role Disputes: Conflicts with significant others (spouse, family, friends).
- Role Transitions: Adapting to major life changes (e.g., retirement, divorce).
- Interpersonal Deficits: Difficulties in forming or maintaining relationships.
- Other forms: Group therapy and psychodynamic/insight-oriented therapy.
Exam Tip: If a question asks which specifier is characterized by "mood reactivity" (the ability to feel better when something good happens), the answer is Atypical Features.
