A panic attack is an abrupt surge of intense fear or discomfort that reaches a peak within minutes, involving ≥4 of 13 characteristic somatic and cognitive symptoms (DSM-5). [1] It is a clinical specifier, not a standalone diagnosis. Approximately 39% of ED patients presenting with cardiopulmonary complaints meet criteria for panic-related anxiety, yet only 1–2% are correctly diagnosed in the ED. [2-3] Panic disorder (recurrent unexpected panic attacks + persistent worry/behavioral change) has a lifetime prevalence of ~5% and a 2:1 female predominance. [1][4]
1. History
- Characterize the episode: abrupt onset, peaks within minutes, self-limited (typically 10–30 minutes)
- Symptom inventory: palpitations, chest pain/tightness, dyspnea, diaphoresis, tremor, dizziness, paresthesias, nausea, derealization/depersonalization, fear of dying or losing control [1]
- Triggers: identifiable stressor vs. "out of the blue" (unexpected attacks define panic disorder) [5]
- Prior episodes: frequency, pattern, escalation, prior ED visits for similar symptoms
- Avoidance behaviors: agoraphobia, exercise avoidance, situational avoidance [1]
- Substance use: caffeine, stimulants (cocaine, amphetamines), cannabis, alcohol withdrawal, nicotine [1]
- Medication history: corticosteroids, sympathomimetics, recent SSRI initiation (can transiently worsen anxiety) [6]
- Psychiatric history: depression, PTSD, prior anxiety diagnoses, suicidal ideation [6-7]
2. Alarm Features
- Onset after age 45 without prior history — raises concern for medical etiology [1]
- Atypical symptoms: vertigo, loss of consciousness, loss of bladder/bowel control, slurred speech, amnesia [1]
- Exertional chest pain, radiation to arm/jaw, diaphoresis → ACS
- Sudden-onset pleuritic chest pain + dyspnea + hypoxia → PE
- Tearing chest/back pain + pulse differential → aortic dissection
- Persistent tachycardia, fever, weight loss → hyperthyroidism, pheochromocytoma
- Focal neurologic deficits → seizure, stroke
- Active suicidal ideation (comorbid depression present in ~50% of panic disorder patients) [6-7]
3. Medications
- Causative/exacerbating agents: caffeine, stimulants (cocaine, amphetamines), cannabis, high-dose corticosteroids, sympathomimetics, thyroid hormone excess [1][7]
- Withdrawal triggers: alcohol, benzodiazepines, barbiturates [1]
- Acute ED treatment: Benzodiazepines (e.g., lorazepam 0.5–1 mg PO/IV) for acute symptom relief; however, routine prescribing at discharge is discouraged due to dependence risk [4][8]
- First-line maintenance: SSRIs (sertraline, escitalopram, paroxetine) or SNRIs (venlafaxine) — start low, titrate slowly as patients with panic are sensitive to initial side effects [6]
- NNT for remission with antidepressants: ~10 over 2–6 months [4]
- Avoid: Beta-blockers have no evidence of benefit for panic attacks despite common use. Antipsychotics and sedating antihistamines are not recommended [4]
- Duration: Continue effective pharmacotherapy for ≥6–12 months to minimize relapse; discontinuing before 1 year leads to relapse in up to 50% [4]
4. Diet
- Caffeine: Major trigger — excessive intake can precipitate or worsen panic attacks; counsel reduction or elimination [7]
- Alcohol: Acute anxiolytic effect but withdrawal exacerbates panic; associated with self-medication and comorbid alcohol use disorder [1][6]
- Stimulant-containing supplements: Energy drinks, ephedrine-containing products
- Hydration: Dehydration can mimic or worsen lightheadedness and tachycardia symptoms
5. Review of Systems
- Cardiac: Chest pain, palpitations, racing heart — distinguish from arrhythmia (regular rapid pounding in neck suggests AVNRT, LR 177) [9]
- Pulmonary: Dyspnea, hyperventilation, choking sensation — rule out asthma, PE
- Neurologic: Dizziness, paresthesias, tremor, derealization — rule out seizure, vestibular dysfunction
- GI: Nausea, abdominal distress — rule out GI pathology
- Endocrine: Heat intolerance, weight changes, tremor → thyroid disease
- Psychiatric: Depression screening (PHQ-9), suicidal ideation, substance use, sleep disturbance [6-7]
6. Collateral History and Family History
- Collateral from family/friends: witnessed episodes, behavioral changes, substance use, functional decline
- Family history: First-degree relatives with panic disorder confer 8-fold increased risk; heritability ~40–48% [4-5][7]
- Parental history of anxiety, depression, or bipolar disorder increases offspring risk [1]
- History of childhood adversity, sexual/physical abuse, parental overprotection [1][7]
7. Risk Factors
- Female sex (2:1 ratio) [1]
- Age: Peak onset in late adolescence to mid-30s [1]
- Temperamental: Neuroticism, anxiety sensitivity, behavioral inhibition [1]
- Smoking/nicotine use: Independent risk factor for panic attacks and panic disorder [1][5]
- Childhood adversity: Trauma, abuse, parental overprotection, low emotional warmth [1][7]
- Major life stressors: ~80% report significant stressors in the 12 months preceding first attack [7]
- Comorbid psychiatric illness: Depression (24–88% comorbidity), GAD (68%), PTSD, substance use disorders [7][10]
- Medical comorbidities: Asthma/COPD, mitral valve prolapse, IBS, migraine, joint hypermobility syndrome [7][11]
8. Differential Diagnosis
Cannot-miss diagnoses
- Acute coronary syndrome: Exertional, radiating chest pain, diaphoresis, ECG changes, troponin elevation [12-13]
- Pulmonary embolism: Pleuritic pain, unilateral leg swelling, hypoxia, tachycardia; use Wells score [12-13]
- Aortic dissection: Tearing pain, pulse differential, widened mediastinum [12]
- Cardiac arrhythmia: SVT, atrial fibrillation — palpitations affected by sleep or occurring at work increase arrhythmia likelihood (LR 2.17–2.29) [9]
- Tension pneumothorax: Unilateral absent breath sounds, tracheal deviation
- Anaphylaxis: Urticaria, angioedema, hypotension
Important medical mimics
- Hyperthyroidism/hypothyroidism [1][7]
- Pheochromocytoma: Episodic hypertension, headache, diaphoresis [1]
- Temporal lobe epilepsy: Aura, automatisms, postictal confusion [7]
- Vestibular dysfunction (Meniere's disease, BPPV) [1][5]
- Hypoglycemia [9]
- Asthma/COPD exacerbation [1][5]
Psychiatric mimics
- PTSD with panic attacks (trauma-cued) [5]
- Substance intoxication/withdrawal [1]
- Somatization disorder [12]
9. Past Medical History
- Prior panic attacks or panic disorder diagnosis
- Previous ED visits for similar symptoms (frequent ED utilization is characteristic) [3][7]
- History of cardiac disease — does NOT exclude panic disorder; both can coexist (panic disorder prevalence is high even in patients with ECG abnormalities) [14]
- Asthma, COPD, mitral valve prolapse, IBS, migraine [7]
- Prior psychiatric diagnoses and treatments (assess adequacy of prior medication trials — dose, duration) [6]
- Substance use history
10. Physical Exam
- Vitals: Tachycardia (sinus) and tachypnea are common during an attack; hypertension may be transient. Hypoxia, persistent tachycardia, or hemodynamic instability should prompt workup for medical causes [6][12]
- Cardiac: Murmurs (aortic stenosis, MVP click, HCM), irregular rhythm, pulse deficits [12]
- Pulmonary: Wheezing (asthma), unilateral decreased breath sounds (pneumothorax), crackles
- Neck: Thyromegaly, JVD, cannon A waves (arrhythmia) [15]
- Neurologic: Focal deficits (seizure, stroke), nystagmus (vestibular)
- Skin: Diaphoresis, flushing, urticaria (anaphylaxis), dermatomal rash (zoster)
- Extremities: Unilateral leg swelling (DVT/PE), tremor
- Psychiatric: Affect, thought content, suicidal ideation assessment
- Key pearl: Exam is often entirely normal between and even during panic attacks — a normal exam in a young patient with classic symptoms is reassuring [7]
11. Lab Studies
- Routine labs are often low-yield in the absence of clinical suspicion for medical causes [7]
- Reasonable initial workup (guided by clinical suspicion):
- ECG (rule out arrhythmia, ischemia) — recommended for most ED presentations with chest pain/palpitations [6-7]
- Troponin (if ACS concern based on risk factors)
- TSH (screen for thyroid disease) [7]
- BMP/CMP (electrolytes, calcium for hyperparathyroidism, glucose) [7]
- CBC (anemia as cause of tachycardia)
- Urine drug screen (if substance use suspected) [15]
- D-dimer (if PE concern, guided by Wells score)
- Depression screening: PHQ-9 or PHQ-2 — critical given 50% comorbidity with major depression [6-7]
- Panic-specific screening: GAD-7 (sensitivity 60.6–89%, specificity 82–87.6%); Panic Disorder Severity Scale for monitoring [4][6]
12. Imaging
- Chest X-ray: Consider if dyspnea, hypoxia, or abnormal lung exam — rules out pneumothorax, pneumonia, widened mediastinum [13]
- CT angiography: If PE or aortic dissection is suspected
- Echocardiography: If structural heart disease suspected (murmur, syncope, family history of HCM/sudden death) [9][15]
- Imaging is often unnecessary in a young, otherwise healthy patient with classic panic symptoms, normal vitals, normal ECG, and prior similar episodes [7]
13. Special Tests
- Panic Disorder Severity Scale (PDSS): Validated tool for monitoring symptom severity and treatment response [4]
- GAD-7: Screening for generalized anxiety; useful for tracking [6]
- PHQ-9: Depression comorbidity screening
- Symptom-based prediction model: ≥3 SCID-defined panic symptoms in ED patients with cardiopulmonary complaints → AUC 0.88, sensitivity 78.4%, specificity 85.7% for panic-related anxiety [2]
- Holter/event monitor: If arrhythmia remains in the differential after initial ECG; diagnostic in only 10–15% but important for symptom-rhythm correlation [9][15]
- Ambulatory ECG monitoring: Recommended when arrhythmia suspicion persists — patients with panic disorder can also have clinically significant arrhythmias [9]
14. ECG
- Typical finding in panic attack: Sinus tachycardia with otherwise normal ECG [9][16]
- Higher mean maximal heart rate and shorter P-R interval have been observed in panic disorder patients [14]
- Most panic episodes show no arrhythmias; when present, they are typically simple premature ventricular complexes [16]
- Rule out: ST changes (ischemia), delta waves (WPW), prolonged QT, Brugada pattern, SVT, atrial fibrillation/flutter [15]
- Key pearl: A known history of panic disorder decreases the likelihood of arrhythmia (LR 0.26), and palpitations lasting <5 minutes also decrease likelihood (LR 0.38) — but panic disorder does NOT exclude coexisting arrhythmia [9]
15. Assessment
A panic attack is a clinical diagnosis of exclusion in the ED — life-threatening mimics must be ruled out based on risk stratification. The classic presentation is a young patient with abrupt-onset multisystem somatic symptoms (chest pain, palpitations, dyspnea, paresthesias) peaking within minutes, often with intense fear of dying, and a normal exam and workup. Approximately 90% of patients with panic disorder will have at least one other psychiatric comorbidity in their lifetime. [7] Recurrent ED visits for similar symptoms without identified medical cause should raise strong suspicion. Atypical features (onset >45 years, focal neurologic signs, persistent vital sign abnormalities, exertional symptoms) warrant more extensive evaluation. [1]
16. Treatment Plan
Acute management (ED)
- Reassurance and psychoeducation: Explain the diagnosis, that symptoms are real but not dangerous, and that panic attacks are treatable [6][17]
- Breathing techniques: Slow diaphragmatic breathing to counteract hyperventilation
- Benzodiazepines for acute relief if needed: lorazepam 0.5–1 mg PO/IV (use judiciously; avoid routine discharge prescriptions) [8]
Outpatient maintenance
- First-line pharmacotherapy: SSRIs or SNRIs [4][6]
- Sertraline 25 mg daily → titrate to 50–200 mg
- Escitalopram 5 mg daily → titrate to 10–20 mg
- Paroxetine 10 mg daily → titrate to 20–40 mg
- Venlafaxine XR 37.5 mg daily → titrate to 75–225 mg
- Start low — patients with panic are sensitive to initial jitteriness/activation [6]
- First-line psychotherapy: CBT (8–20 weekly sessions); as effective as pharmacotherapy; combination may be superior [4]
- Avoid long-term benzodiazepines as monotherapy — risk of tolerance, dependence, withdrawal, and mortality [4]
- Treat comorbid depression and substance use disorders concurrently [4]
- Smoking cessation decreases both short- and long-term anxiety symptoms [4]
17. Disposition
- Discharge (vast majority — ~90% of anxiety-related ED visits): Normal vitals, normal ECG, negative troponin (if obtained), no red flags, symptoms resolving, safe psychiatric assessment [8]
- Observation/admission criteria:
- Persistent hemodynamic instability or hypoxia
- Abnormal ECG or elevated troponin requiring further workup
- Active suicidal ideation or plan (psychiatric admission)
- Inability to exclude life-threatening diagnosis
- Severe comorbid psychiatric decompensation
- Specialist consultation triggers:
- Psychiatry: Refractory panic disorder, active suicidality, complex comorbidity
- Cardiology: Suspected arrhythmia, structural heart disease
- Endocrinology: Suspected pheochromocytoma, refractory thyroid disease
18. Follow Up / Return Precautions
- Follow-up: PCP or psychiatry within 1–2 weeks for medication initiation/titration and CBT referral [6]
- Return precautions — instruct patients to return for:
- Chest pain with exertion, radiation, or diaphoresis
- Syncope or near-syncope
- Persistent shortness of breath or hypoxia
- New neurologic symptoms (weakness, speech changes, vision changes)
- Suicidal thoughts
- Patient counseling:
- Panic attacks are frightening but not life-threatening
- Effective treatments exist — most patients improve significantly with SSRIs and/or CBT [4]
- Avoid caffeine, stimulants, and excessive alcohol
- Expect 4–6 weeks for full SSRI effect; initial side effects (jitteriness, GI upset) typically resolve [6]
- Relapse is common if medication is stopped prematurely (<1 year) — up to 50% relapse rate [4]
- Expected course: With treatment, the majority of patients achieve significant symptom reduction. Without treatment, panic disorder tends to follow a chronic, waxing-and-waning course with high healthcare utilization [7]
Images
References
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