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Difficulty: EasyAnxiety, OCD, and Trauma-Related Disorders

A 24-year-old male graduate student visits the campus health clinic reporting three recent episodes of intense, unprovoked terror. During these episodes, which reach maximum intensity within minutes, he experiences a racing heart, a choking sensation, tremors, and a fear of losing control. He has started avoiding large lecture halls due to the worry of having an episode in public. He has no known chronic medical conditions and takes no prescription medications. His vital signs are within normal limits. The physician suspects a primary anxiety disorder but needs to exclude physiological causes. Which of the following are the most appropriate initial diagnostic steps in management? (Select 3)

  1. 12-lead electrocardiographyAnswer
  2. Thyrotropin (TSH) levelAnswer
  3. Urine drug immunoassayAnswer
  4. D
    Free thyroxine (T4) assessment as a standalone test
  5. E
    Arterial blood gas analysis

Answer

The most appropriate initial diagnostic steps are a 12-lead electrocardiography, a thyrotropin (TSH) level, and a urine drug immunoassay.
The clinical vignette describes a patient experiencing classic panic attacks. However, panic disorder can only be diagnosed after ruling out underlying physiological causes. The standard medical workup for new-onset panic attacks includes a 12-lead electrocardiogram to rule out cardiac arrhythmias (such as paroxysmal supraventricular tachycardia), a thyrotropin (TSH) level to evaluate for hyperthyroidism, and a urine drug screen to rule out intoxication with stimulants (e.g., cocaine, amphetamines). These tests are non-invasive, cost-effective, and address the most dangerous and common mimics.

Step-by-Step Solution

1
Identify the clinical syndrome
The patient's sudden episodes of intense fear, physical symptoms (palpitations, tremors), and subsequent avoidance behavior strongly suggest panic attacks and possible panic disorder.
Recognizing the symptom cluster is required to determine the appropriate diagnostic pathway.
2
Determine necessary diagnostic exclusions
Before establishing a psychiatric diagnosis, common medical and substance-related etiologies that present with identical symptoms must be ruled out.
Panic disorder is a diagnosis of exclusion in a patient presenting with acute cardiopulmonary and autonomic symptoms.
3
Select the appropriate tests
ECG (cardiac arrhythmias), TSH (hyperthyroidism), and a drug screen (stimulant use) are chosen as the standard non-invasive workup.
These tests efficiently evaluate the most common physiological mimics of panic attacks.

Key Concept

The initial evaluation of suspected new-onset panic disorder requires excluding common medical mimics (e.g., arrhythmias, hyperthyroidism) and substance intoxication using ECG, TSH, and drug screening.
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Topics

Anxiety, OCD, and Trauma-Related Disorders

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