Persistent Depressive Disorder Case Studies & Practical Application 4 — Questions and Answers
Question 1: A clinician sees a patient who meets full PDD criteria. The patient also reports two prior episodes that met full MDD criteria, each lasting about 4 months. How does this history affect the current PDD diagnosis?
- The MDD history invalidates the PDD diagnosis
- PDD and prior MDD episodes are mutually exclusive
- Prior MDD episodes do not preclude a current PDD diagnosis (Correct answer)
- The patient must be reclassified as having Bipolar II Disorder
Correct answer: Prior MDD episodes do not preclude a current PDD diagnosis
A history of discrete MDD episodes does not exclude a current PDD diagnosis; the conditions can coexist longitudinally.
Question 2: A nurse practitioner is evaluating whether a patient's depressive symptoms are due to PDD or a medical condition (hypothyroidism). What is the most important first step?
- Begin an SSRI while awaiting lab results
- Order a TSH and relevant metabolic labs before diagnosing PDD (Correct answer)
- Diagnose PDD and reassess after 6 months
- Refer immediately to psychiatry without ordering labs
Correct answer: Order a TSH and relevant metabolic labs before diagnosing PDD
DSM-5 requires ruling out general medical conditions (e.g., hypothyroidism) that could cause depressive symptoms before assigning a PDD diagnosis.
Question 3: A 32-year-old with PDD tells her therapist she feels completely numb and hopeless. She says, 'Things will never get better, so why try?' This cognition is most consistent with which PDD-related cognitive pattern?
- Grandiosity
- Chronic negative self-schema and hopelessness (Correct answer)
- Paranoid ideation
- Obsessive rumination about contamination
Correct answer: Chronic negative self-schema and hopelessness
Chronic hopelessness and negative self-schemas are hallmark cognitive features in PDD that often become entrenched over the long illness course.
Question 4: A patient with PDD is reluctant to try medication because 'I've always been this way.' What motivational strategy is most appropriate to address this barrier?
- Confront the patient about their resistance and insist on medication
- Respect the refusal and continue supportive therapy only
- Psychoeducation about PDD as a treatable condition, not a personality trait (Correct answer)
- Refer the patient to a psychiatrist and disengage from the case
Correct answer: Psychoeducation about PDD as a treatable condition, not a personality trait
Psychoeducation that reframes PDD as a neurobiological disorder rather than a character flaw can reduce stigma and increase treatment engagement.
Question 5: A clinical researcher notes that patients with PDD often show delayed treatment response compared to those with acute MDD. What treatment implication does this have?
- PDD patients should receive shorter courses of antidepressants
- Adequate antidepressant trials for PDD may require 8–12 weeks or longer (Correct answer)
- Switch antidepressants after 2 weeks if no response is observed
- PDD does not respond to antidepressants and should be treated with therapy only
Correct answer: Adequate antidepressant trials for PDD may require 8–12 weeks or longer
Chronic depression including PDD often requires longer antidepressant trials (8–12 weeks) before declaring non-response and adjusting treatment.
Question 6: A 45-year-old with PDD reports that her symptoms worsen each winter with increased sleep, carbohydrate craving, and weight gain. Which DSM-5 specifier best applies?
- With melancholic features
- With seasonal pattern (Correct answer)
- With atypical features
- With peripartum onset
Correct answer: With seasonal pattern
Consistent seasonal worsening of depressive episodes is captured by the 'with seasonal pattern' specifier in DSM-5.
Question 7: During treatment for PDD, a patient suddenly reports elevated mood, decreased need for sleep, and increased goal-directed activity lasting 5 days. What is the most important clinical concern?
- The antidepressant has successfully treated the PDD
- A hypomanic episode may have been triggered, suggesting a bipolar spectrum diagnosis (Correct answer)
- This is a normal rebound from chronic depression and requires no action
- The patient is likely experiencing a dissociative episode
Correct answer: A hypomanic episode may have been triggered, suggesting a bipolar spectrum diagnosis
New hypomanic symptoms during antidepressant treatment for PDD raise concern for antidepressant-induced mania/hypomania and a possible underlying bipolar spectrum disorder.
Persistent Depressive Disorder Case Studies & Practical Application 4
A clinician sees a patient who meets full PDD criteria.
The patient also reports two prior episodes that met full MDD criteria, each lasting about 4 months.
How does this history affect the current PDD diagnosis?