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Difficulty: MediumAnxiety, OCD, and Trauma-Related Disorders

A 27-year-old man presents to the clinic reporting sudden, unexpected episodes of intense fear, heart palpitations, diaphoresis, and shortness of breath occurring over the past month. The episodes peak within 10 minutes and resolve after approximately an hour. Between episodes, he constantly worries about having another attack. He has no known medical history. Upon taking a detailed psychiatric history, he reports a past episode where he felt "on top of the world," had a decreased need for sleep (3 hours per night), and engaged in reckless spending for two weeks, which resolved spontaneously. Vital signs and physical examination are unremarkable. An electrocardiogram shows normal sinus rhythm. Which of the following are the most appropriate initial steps in the evaluation and management of this patient? (Select all that apply)

  1. Serum thyroid-stimulating hormone levelAnswer
  2. Urine toxicology screenAnswer
  3. C
    Initiation of sertraline monotherapy
  4. D
    24-hour urine fractionated metanephrines
  5. E
    Transthoracic echocardiography

Answer

The most appropriate initial steps are obtaining a serum thyroid-stimulating hormone level and a urine toxicology screen.
The correct choices identify the standard medical rule-out tests for new-onset panic attacks. A urine toxicology screen is indicated to rule out substance-induced anxiety (e.g., from cocaine or amphetamines). A serum thyroid-stimulating hormone level is necessary to rule out hyperthyroidism, which can closely mimic panic attacks by causing symptoms such as tachycardia, diaphoresis, and tremors.

Step-by-Step Solution

1
Analyze the patient's acute symptoms.
The patient is experiencing sudden, unexpected episodes of intense fear and autonomic arousal (palpitations, diaphoresis, shortness of breath) along with anticipatory anxiety, which is characteristic of panic attacks.
Identifying the primary symptom cluster guides the differential diagnosis toward anxiety disorders and their medical mimics.
2
Determine the necessary initial diagnostic workup.
Before diagnosing a primary psychiatric disorder like Panic Disorder, general medical conditions and substance use must be ruled out. A serum thyroid-stimulating hormone level and a urine toxicology screen are the standard first steps.
Hyperthyroidism and stimulant intoxication (e.g., cocaine, amphetamines) can present with symptoms identical to panic attacks.
3
Evaluate the patient's psychiatric history for comorbidities.
The patient describes a past two-week episode of euphoria, decreased need for sleep, and impulsive behavior, which meets the criteria for a manic episode. This establishes a diagnosis of Bipolar I disorder.
Identifying bipolar disorder is critical because it significantly alters the pharmacological management of co-occurring anxiety.
4
Assess the safety of pharmacological interventions.
Initiating an SSRI monotherapy (like sertraline) for panic symptoms is contraindicated due to the high risk of precipitating a manic switch in a patient with bipolar disorder.
Ensuring patient safety by avoiding contraindicated medications is a key component of management formulation.

Key Concept

The initial workup of new-onset panic attacks requires ruling out common medical and substance-induced causes (e.g., hyperthyroidism, stimulant intoxication). Additionally, a careful psychiatric history to screen for bipolar disorder is essential before initiating antidepressant monotherapy to prevent a manic switch.
Estimated Time:1m 30s
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Topics

Anxiety, OCD, and Trauma-Related Disorders

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