A 32-year-old woman from Delhi presents to the psychiatry outpatient department with a 2-year history of sudden, unexpected episodes of intense fear accompanied by palpitations, sweating, trembling, and a sense of impending doom. The episodes last 20–30 minutes and occur unpredictably, sometimes 2–3 times per week. She reports that over the past 6 months, she has begun avoiding crowded places, public transport, and shopping malls because she fears having an attack in a situation from which escape might be difficult. She denies any specific trigger for the initial episodes. Vital signs during a panic episode show HR 110 bpm, BP 140/90 mmHg, RR 22/min. What is the most likely diagnosis?

Explanation

## Diagnosis: Panic Disorder with Agoraphobia ### Clinical Presentation Analysis This patient exhibits the cardinal features of panic disorder with agoraphobia: 1. **Recurrent, unexpected panic attacks** — sudden onset of intense fear with autonomic symptoms (palpitations, sweating, trembling) 2. **Anticipatory anxiety** — worry about having another attack 3. **Avoidance behavior** — systematic avoidance of situations (crowds, public transport, malls) from which escape would be difficult or embarrassing 4. **Functional impairment** — the avoidance restricts her activities and quality of life ### Diagnostic Criteria (DSM-5) **Key Point:** Panic disorder requires ≥4 panic attacks in a 4-week period (or 1 attack followed by ≥1 month of persistent worry about recurrence). Agoraphobia is diagnosed when the patient avoids situations due to fear of panic symptoms or other incapacitating symptoms. **High-Yield:** The *absence of a specific trigger* for the initial panic attacks distinguishes panic disorder from phobias, where fear is cued by a specific object or situation. ### Why This Is NOT the Other Diagnoses | Diagnosis | Key Distinguishing Feature | |-----------|---------------------------| | Generalized anxiety disorder | Characterized by persistent, diffuse worry about multiple life domains (not episodic panic attacks); no avoidance behavior | | Specific phobia | Fear is *triggered* by a specific object/situation (e.g., heights, animals); attacks are predictable and cued | | Social anxiety disorder | Fear is triggered by social evaluation or performance situations; not spontaneous panic attacks | ### Pathophysiology **Clinical Pearl:** Panic disorder involves dysregulation of the amygdala and prefrontal cortex, with heightened sensitivity to interoceptive cues (internal bodily sensations). The "fear of fear" cycle perpetuates avoidance and agoraphobia. ### Management Approach ```mermaid flowchart TD A[Panic Disorder Diagnosed]:::outcome --> B{First-line treatment?}:::decision B -->|Psychotherapy| C[Cognitive-behavioral therapy<br/>with exposure]:::action B -->|Pharmacotherapy| D[SSRI/SNRI]:::action C --> E[Interoceptive exposure<br/>& situational exposure]:::action D --> F[Sertraline, paroxetine,<br/>or venlafaxine]:::action E --> G[Symptom reduction<br/>& agoraphobia resolution]:::outcome F --> G ``` **Mnemonic:** **PANIC** — Panic attacks (unexpected), Anticipatory anxiety, Negative avoidance (agoraphobia), Impairment in functioning, Coping strategies develop [cite:DSM-5 Diagnostic and Statistical Manual of Mental Disorders]