A 33-year-old woman is brought to the physician by her husband because of persistent sadness for the past 2 months. During this period, she also has had difficulty sleeping and an increased appetite. She had similar episodes that occurred 2 years ago and 9 months ago that each lasted for 4 months. Between these episodes, she reported feeling very energetic and rested after 3 hours of sleep. She often went for long periods of time without eating. She works as a stock market trader and received a promotion 5 months ago. She regularly attends yoga classes on the weekends with her friends. On mental status examination, she has a blunted affect. She denies suicidal thoughts and illicit drug use. Which of the following is the most likely diagnosis?

Major depressive disorder with seasonal pattern

Major depressive disorder with atypical features

A mental health volunteer is interviewing locals as part of a community outreach program. A 46-year-old man discloses that he has felt sad for as long as he can remember. He feels as though his life is cursed and if something terrible can happen to him, it usually will. He has difficulty making decisions and feels hopeless. He also feels that he has had worsening suicidal ideations, guilt from past problems, decreased energy, and poor concentration over the past 2 weeks. He is otherwise getting enough sleep and able to hold a job. Which of the following statement best describes this patient's condition?

The patient has double depression.

The patient may have symptoms of mania or psychosis.

The patient is likely to show anhedonia.

The patient likely has paranoid personality disorder.

The patient should be started on an SSRI.

A 24-year-old male comes into the psychiatric clinic complaining of consistent sadness. He endorses feelings of worthlessness, anxiety, and anhedonia for the past couple months but denies feeling suicidal. He further denies any past episodes of feeling overly energetic with racing thoughts. Confident of the diagnosis, you recommend frequent talk therapy along with a long-term prescription of a known first-line medication for this disorder. What is the drug and what are some of the most frequently encountered side effects?

Selective serotonin reuptake inhibitor; anorgasmia, insomnia

Selective serotonin reuptake inhibitor; hypomania, suicidal thoughts

Tricyclic antidepressants; hypomania, suicidal thoughts

Monoamine oxidase inhibitors; Orthostatic hypotension, weight gain

Tricyclic antidepressants; Orthostatic hypotension, anticholinergic effects

A 19-year-old female college student is brought into the emergency department by her boyfriend. The boyfriend reports that the patient got caught stealing from the company she works for and subsequently got fired. The boyfriend received a text that evening saying “I’ll miss you.” When he arrived at her dorm room, the patient was slumped in the shower covered in blood. The patient agreed to be driven to the emergency room. When asked about what happened, the patient replies “I just want out of this life.” The patient has bipolar disorder, and takes lithium as prescribed. She has a psychiatrist she sees every week, which the boyfriend confirms. She has never had a prior suicide attempt nor has she ever been hospitalized for a psychiatric disorder. The patient’s vitals are stable. Upon physical examination, a 4 centimeter vertical incision is noted on the patient’s left forearm. During the patient’s laceration repair, she asks if she will be admitted. She states, “these ups and downs are common for me, but I feel better now.” She verbalizes that she understands that she overreacted. She asks to go home, and her boyfriend insists that he will stay with her. They both confirm that neither of them have guns or know any peers with access to guns. Which of the following is the most appropriate management for the patient?

Involuntarily admit the patient

Have the patient sign a suicide contract before discharge

Set up a next-day appointment with the patient’s psychiatrist

Discontinue lithium and start valproate

Rapid cycling bipolar disorder for USMLE Step 1: High-Yield Psychiatry Lessons

Diagnosis & Criteria - The Bipolar Express

Core Feature: At least 4 major mood episodes (manic, hypomanic, or depressive) within a 12-month period.
Episode Criteria:
- Must meet full duration and symptom criteria for the specific mood episode.
- Separated by at least 2 months of partial/full remission or by a switch to an opposite polarity episode.
Clinical Significance:
- Represents a more severe course of illness.
- Associated with ↑ resistance to treatment and poorer long-term prognosis.
- Higher risk of suicide attempts.

Mood episodes in rapid cycling bipolar disorder

⭐ Exam Favorite: Antidepressant monotherapy can induce or worsen rapid cycling in patients with bipolar disorder. Always screen for a history of mania/hypomania before prescribing antidepressants for depression.

Etiology & Risks - Fueling the Fire

Genetic & Neurobiological Roots:
- Strong familial link; high heritability.
- Dysregulation of serotonin, dopamine, and norepinephrine.
- Hypothalamic-pituitary-adrenal (HPA) axis dysfunction.
Clinical Risk Factors:
- Female sex.
- Bipolar II disorder pattern.
- Earlier age of onset.
- Hypothyroidism (subclinical or overt).
- Substance use (cocaine, alcohol).

⭐ Antidepressant-Induced Switching: A major iatrogenic risk is the use of antidepressant monotherapy, which can precipitate manic/hypomanic episodes and trigger a rapid-cycling course.

📌 Mnemonic (FAST): Key risks: Female, Antidepressant use, Substance abuse, Thyroid disease.

Management - Switching Tracks

Antidepressant Discontinuation:
- First step when a patient develops manic/hypomanic symptoms.
- Taper gradually over 2-4 weeks to prevent withdrawal.
- ⚠️ Abrupt discontinuation is reserved for severe, emergent mania.
- This action removes a key driver of mood destabilization.
Mood Stabilizer Strategy:
- After stopping the antidepressant, optimize the primary mood stabilizer.
- Verify therapeutic serum levels (e.g., Lithium 0.6-1.2 mEq/L, Valproate 50-125 mcg/mL).
- If ineffective, initiate a cross-taper: slowly decrease the current drug while slowly increasing the new one.

⭐ Antidepressant monotherapy is a major risk factor for inducing mania in patients with an underlying (and often undiagnosed) bipolar disorder. The "switch" is frequently iatrogenic.

High-Yield Points - ⚡ Biggest Takeaways

Rapid cycling is defined by ≥4 mood episodes (manic, hypomanic, or major depressive) in 1 year.

It is more common in women, patients with bipolar II disorder, and can be associated with hypothyroidism.

Antidepressant monotherapy is a significant risk factor for inducing rapid cycling.

Patients typically have a poorer response to lithium monotherapy.

Valproate or lamotrigine are often preferred as initial treatment over lithium.

Indicates a more difficult course of illness and poorer long-term prognosis.

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