Clinical Vignette
Patient: "Mr. T," 34-year-old software engineer, presenting to the emergency department for the 4th time in 3 months with chest pain, palpitations, and the conviction that he is having a heart attack.
Chief Concern: "My heart is racing, I can't breathe, and my chest is tight. I'm going to die. This has to be a heart attack."
History of Present Illness: Mr. T has presented to emergency departments 4 times in 3 months with acute episodes of chest tightness, palpitations (heart rate to 130 bpm), shortness of breath, diaphoresis, trembling, dizziness, and an overwhelming fear of dying. Episodes begin abruptly (reach peak intensity within 5-10 minutes) without identifiable triggers. Each ER visit has included EKG (normal sinus tachycardia), troponin (negative x2 each visit), chest X-ray (normal), and on the most recent visit, a stress echocardiogram (normal). Between episodes, he reports persistent worry about having another attack, monitoring his heart rate on his smartwatch (checks 20+ times daily), avoiding exercise (fears it will trigger a heart attack), and avoiding caffeine. He has stopped driving alone because he fears losing consciousness at the wheel during an episode. Episodes occur approximately 2-3 times per week. Duration is 20-30 minutes, with residual anxiety lasting hours afterward.
Medical History: No cardiac history. Family history: no premature cardiac death. Non-smoker. BMI 23. No diabetes or hypertension.
Mental Status Exam: Currently in post-episode state (episode occurred 2 hours ago in ER). Alert. Mildly anxious. Speech normal. Mood 'scared.' Affect anxious but calming. No psychotic symptoms. Convinced this episode was 'different' from the previous three. Insight emerging as vital signs normalize.
Step 1: Panic Attack Criteria
DSM-5-TR defines a panic attack as an abrupt surge of intense fear or discomfort reaching peak within minutes, with 4 or more of 13 symptoms:
(1) Palpitations, pounding heart, accelerated HR
Heart rate to 130 bpm. Palpitations are the presenting concern. PRESENT.
(2) Sweating
Diaphoresis during episodes. PRESENT.
(3) Trembling or shaking
Trembling reported during episodes. PRESENT.
(4) Shortness of breath
Sensation of being unable to breathe adequately. PRESENT.
(5) Chest pain or discomfort
Chest tightness is a primary complaint. PRESENT.
(6) Dizziness, lightheadedness
Dizziness during episodes. PRESENT.
(10) Paresthesias
Reports tingling in fingers during episodes. PRESENT.
(13) Fear of dying
Overwhelming conviction that he is having a fatal heart attack. PRESENT.
Summary: 8 of 13 symptoms, reaching peak within 5-10 minutes. ≥4 required.
Panic attacks confirmed. PANIC ATTACKS CONFIRMED.
Step 2: Panic Disorder Criteria
Criterion A: Recurrent unexpected panic attacks.
2-3 attacks per week for 3 months. Attacks are unexpected (no identifiable trigger). MET.
Criterion B: ≥1 attack followed by ≥1 month of: (1) persistent concern about additional attacks, or (2) maladaptive behavioral change related to attacks.
(1) Persistent worry about having more attacks. Monitors heart rate 20+ times daily. (2) Behavioral changes: avoids exercise, avoids caffeine, avoids driving alone. Duration: 3 months. BOTH B CRITERIA MET.
Criterion C: Not attributable to substance or medical condition.
Four ER workups (EKG, troponin, stress echo) all normal. No cardiac pathology identified. No substance use. No thyroid disease. MET — CARDIAC CAUSE EXCLUDED.
Step 3: Systematic Cardiac Exclusion
| Feature | Panic Attack | Cardiac Arrhythmia | This Patient |
|---|---|---|---|
| Onset | Abrupt surge (seconds) | Variable (may be abrupt) | Abrupt (5-10 min peak) |
| Duration | 10-30 minutes, self-resolving | Variable; may be sustained | 20-30 minutes, self-resolving |
| Exercise relationship | May occur at rest | Often triggered by exertion | Occurs at rest, avoids exercise |
| EKG during event | Sinus tachycardia | Arrhythmia (SVT, VT, AF) | Sinus tachycardia only |
| Troponin | Negative | May be elevated | Negative x8 (across 4 visits) |
| Stress test | Normal | May show ischemia | Normal stress echo |
| Response to reassurance | Temporary relief, symptoms return | Medical findings persist | Temporary relief per episode |
| Fear of dying | Core cognitive symptom | May or may not be present | Core feature of every episode |
Cardiac Assessment
Four comprehensive cardiac workups spanning 3 months have been entirely normal (8 negative troponins, 4 normal EKGs, 1 normal stress echocardiogram). The pretest probability of occult cardiac disease in a 34-year-old non-smoker with normal BMI, no family history of premature cardiac death, and repeatedly normal workups is extremely low. Panic Disorder is the diagnosis.
Diagnostic Formulation
Diagnostic Conclusion
Panic Disorder (F41.0): All DSM-5-TR criteria met. Recurrent unexpected panic attacks (2-3/week x 3 months) with 8 of 13 symptoms. Persistent concern plus maladaptive behavioral change (>1 month). Cardiac pathology excluded by comprehensive workup. Treatment: SSRI (sertraline or escitalopram) as first-line pharmacotherapy; CBT with interoceptive exposure and cognitive restructuring of catastrophic cardiac misinterpretations.
Teaching Points
- Panic attacks involve abrupt onset with peak symptoms within minutes. This distinguishes them from other forms of anxiety, which build gradually. The acute, paroxysmal nature is a defining feature.
- Cardiac-focused panic presentations are common and lead to high rates of ER utilization and cardiac workup. Once adequate cardiac exclusion is achieved, continued ER visits for reassurance represent avoidance behavior that maintains the disorder. Redirecting to outpatient psychiatric care is essential.
- Interoceptive exposure (deliberately inducing the physical sensations of panic in a controlled setting, such as hyperventilation exercises, spinning, or straw-breathing) is a critical component of CBT for Panic Disorder. It desensitizes the patient to the bodily sensations that trigger catastrophic misinterpretation.
- Catastrophic misinterpretation of bodily sensations is the cognitive model of Panic Disorder. The patient experiences a benign physiological event (slight heart rate increase), interprets it as catastrophic (heart attack), which triggers anxiety-mediated sympathetic activation, which produces more symptoms, which reinforces the catastrophic interpretation. CBT targets this cycle.
- Heart rate monitoring via smartwatch can maintain and worsen Panic Disorder by providing constant data for catastrophic misinterpretation. Clinicians should consider recommending discontinuation of HR monitoring as part of the treatment plan (reducing safety behaviors).