What Is Panic Disorder?
A panic attack is a sudden, intense episode of fear or discomfort that peaks within minutes, accompanied by intense physical symptoms — palpitations, shortness of breath, chest pain, dizziness, and a sense of impending doom. The experience is so intense that many patients believe they are having a heart attack or "going crazy".
Panic disorder is diagnosed when attacks are recurrent and unexpected, and the patient develops persistent worry about having additional attacks or modifies behavior out of fear of them. Not everyone who has a panic attack develops the disorder — isolated attacks are relatively common.
It is fundamental to understand that a panic attack, although terrifying, is not dangerous and does not cause death. What occurs is a massive activation of the sympathetic nervous system — the "fight or flight" response — without a corresponding real threat. The body is reacting as if there were a life-threatening danger when, in reality, there is none.
Brain "False Alarm"
A panic attack is essentially a false trigger of the brain's alarm system — the amygdala activates the emergency response without a real threat.
Self-Limiting
Although it feels endless, a panic attack peaks within 10 minutes and rarely lasts more than 30 minutes. The body cannot sustain that level of activation indefinitely.
Highly Treatable
Panic disorder responds very well to treatment — 70-90% of patients reach remission with CBT and/or medication.
Pathophysiology
A panic attack results from inappropriate activation of the brain's alarm system. The amygdala, locus coeruleus, and parabrachial nucleus trigger a cascade of autonomic and hormonal responses identical to those that would occur in the face of a real threat — but with no threat present.
The Panic Cascade
The attack begins with firing of the amygdala, which activates the locus coeruleus (massive norepinephrine release) and the hypothalamus (HPA axis and sympathetic nervous system activation). This results in adrenal release of adrenaline, causing tachycardia, vasoconstriction, bronchodilation, sweating, and hyperventilation.
A key feature is the positive feedback loop: the physical symptoms (palpitation, shortness of breath) are interpreted as dangerous by the cortex ("I'm having a heart attack"), which amplifies amygdala activation, which intensifies the physical symptoms — a cycle that escalates rapidly. CBT works by interrupting this catastrophic interpretation.
The Role of Hyperventilation
Hyperventilation (rapid, shallow breathing) is central in most panic attacks. It causes respiratory alkalosis (reduction in blood CO2), which produces cerebral vasoconstriction (dizziness, faintness), paresthesias (tingling in hands and face), carpopedal spasm, and a sense of unreality — symptoms that feed the panic cycle.
Symptoms
A panic attack is defined by an abrupt surge of intense fear or discomfort that peaks within minutes. For diagnosis, at least 4 of the 13 symptoms listed below are required during an episode.
Panic Attack Symptoms (DSM-5)
- 01
Palpitations or tachycardia
Sensation that the heart is racing, pounding, or "jumping out of the chest". Result of sympathetic activation and adrenaline release. It is the most common symptom.
- 02
Sweating
Heavy perspiration, especially on the palms, underarms, and face. Thermoregulatory response to sympathetic activation.
- 03
Trembling
Fine or coarse tremor, especially in the hands. Result of muscle tension and adrenergic discharge.
- 04
Shortness of breath or sense of suffocation
Sensation of being unable to breathe or that air is not entering the lungs. Paradoxical hyperventilation often occurs — the person breathes too much, not too little.
- 05
Chest pain or discomfort
Chest pain that mimics angina. Caused by intercostal muscle tension and hyperventilation. The leading reason for emergency room visits.
- 06
Nausea or abdominal discomfort
Result of redistribution of blood flow and sympathetic activation of the gastrointestinal tract.
- 07
Dizziness or faintness
Caused by hyperventilation (cerebral vasoconstriction) and the vasovagal response. Actual fainting is rare in panic.
- 08
Chills or hot flashes
Vasomotor dysregulation from alternating sympathetic activation. The person may feel cold and hot at the same time.
- 09
Paresthesias (tingling)
Tingling in hands, feet, face, and perioral region. Caused by respiratory alkalosis from hyperventilation.
- 10
Derealization or depersonalization
Sensation that the environment is not real or of being "outside the body". Results from cerebral vasoconstriction and dissociative mechanisms.
- 11
Fear of losing control or going crazy
Intense feeling of being about to "lose one's mind". It is purely a perception — there is no real risk of psychosis during panic.
- 12
Fear of dying
Conviction of dying — heart attack, stroke, or another emergency. It is the most terrifying cognitive symptom and the one that most often prompts an emergency visit.
Diagnosis
The diagnosis of panic disorder is clinical. However, on first presentation — especially with chest pain and shortness of breath — it is essential to rule out medical emergencies such as acute myocardial infarction, pulmonary embolism, arrhythmias, and pneumothorax.
After excluding organic causes, the diagnosis is established based on DSM-5 criteria. The PDSS (Panic Disorder Severity Scale) assists in assessing severity and monitoring treatment.
🏥DSM-5 Criteria for Panic Disorder
Fonte: American Psychiatric Association — DSM-5
Criterion A: Recurrent and Unexpected Panic Attacks
- 1.Abrupt surge of intense fear or discomfort, peaking within minutes
- 2.Presence of at least 4 of 13 somatic and cognitive symptoms
- 3.Attacks are unexpected (not triggered by an obvious cue)
Criterion B: Consequences (≥ 1, for at least 1 month)
At least one of the criterion B items must be present- 1.Persistent worry about additional attacks
- 2.Worry about consequences of the attacks (heart attack, "going crazy")
- 3.Significant change in behavior (avoidance of exercise, places, situations)
Exclusions
- 1.Not attributable to substances (caffeine, stimulants, withdrawal)
- 2.Not better explained by another mental condition (social phobia, PTSD, OCD)
DIFFERENTIAL DIAGNOSIS: PANIC ATTACK VS. MEDICAL EMERGENCIES
| CONDITION | SIMILARITY | HOW TO DIFFERENTIATE |
|---|---|---|
| Acute myocardial infarction | Chest pain, shortness of breath, sweating | ECG, troponin. In AMI: pain radiates to arm/jaw, cardiovascular risk factors |
| Pulmonary embolism | Sudden dyspnea, tachycardia, chest pain | D-dimer, CT angiography. PE: progressive dyspnea, thrombotic risk factor |
| Hyperthyroidism | Tachycardia, anxiety, tremor, sweating | TSH and free T4. Hyperthyroidism: weight loss, goiter, exophthalmos |
| Cardiac arrhythmia (PSVT) | Sudden palpitations, dizziness | ECG, Holter. Arrhythmia: abrupt onset and offset, fixed rate |
| Asthma exacerbation | Dyspnea, chest tightness | Spirometry, wheezing on auscultation. Asthma: wheezing, accessory muscle use |
| Pheochromocytoma | Paroxysmal attacks of palpitation and sweating | Urinary/plasma metanephrines. Pheochromocytoma: severe hypertension |
DIAGNÓSTICO DIFERENCIAL
Diagnóstico Diferencial
Acute Coronary Syndrome
- Chest pain with pressure quality
- Cardiovascular risk factors
- ECG changes
- First presentation with chest pain = rule out AMI
Testes Diagnósticos
- ECG
- Troponin
Hyperthyroidism
- Persistent palpitations (not episodic)
- Weight loss
- Exophthalmos
Testes Diagnósticos
- TSH
- Free T4
Pheochromocytoma
- Paroxysmal hypertension
- Headache + sweating + palpitations
- Very rare
- Severe episodic hypertension = investigate pheochromocytoma
Testes Diagnósticos
- Urinary metanephrines
GAD
Leia mais →- Continuous anxiety without discrete peaks
- Generalized worry
- No clearly delimited episode
Testes Diagnósticos
- GAD-7
- DSM-5 Criteria
Cardiac Arrhythmia
- Objective tachycardia during symptoms
- Palpitations without prominent anxiety
- Holter with abnormality
Testes Diagnósticos
- 24h Holter
- Echocardiogram
Cardiovascular Emergencies
The distinction between a panic attack and acute coronary syndrome (ACS) is one of the most critical in emergency medicine. The symptoms overlap: chest pain, palpitations, shortness of breath, sweating, and a sense of impending doom. The practical rule is: on first presentation with chest pain, rule out AMI before diagnosing panic. ECG and troponin are mandatory. Features favoring a cardiac origin: burning or pressure pain radiating to the left arm or jaw, intense nausea, cold diaphoresis, and cardiovascular risk factors (smoking, hypertension, diabetes, dyslipidemia, family history).
Cardiac arrhythmias such as paroxysmal supraventricular tachycardia (PSVT) can cause abrupt episodes of intense palpitations with a sense of impending doom, easily confused with panic. The difference: in PSVT, the objective heart rate is very high (generally >150 bpm) and a Holter may capture the episode. In panic, tachycardia is usually 100-130 bpm and resolves spontaneously.
Endocrine Causes: Hyperthyroidism and Pheochromocytoma
Hyperthyroidism can cause spells of palpitations, tremor, sweating, and anxiety that mimic panic attacks. The difference is that in hyperthyroidism the palpitations tend to be persistent (not episodic), there is weight loss despite increased appetite, heat intolerance, and, in advanced cases, exophthalmos (protruding eyes). TSH and free T4 are mandatory tests — if TSH is suppressed, the diagnosis is hyperthyroidism and treatment is directed at the thyroid.
Pheochromocytoma is rare (1 in 100,000), but ruling it out is important in atypical cases. The classic triad — intense pulsatile headache, profuse sweating, and palpitations — occurring in paroxysmal episodes with severe arterial hypertension should raise suspicion. 24-hour urinary metanephrines are the screening test. An undiagnosed pheochromocytoma is potentially fatal in the setting of surgical stress or use of certain medications.
GAD vs. Panic Disorder
The distinction between GAD and panic disorder is relevant because the specific treatment differs. In panic disorder, the central feature is the occurrence of discrete, delimited attacks of intense terror peaking within 10 minutes, followed by anticipatory anxiety (fear of having more attacks) and avoidance. In GAD, anxiety is continuous, diffuse, without discrete "peaks", related to chronic worries about multiple topics.
The two disorders frequently coexist: patients with panic disorder develop generalized anxiety between episodes. CBT for panic includes specific techniques such as interoceptive exposure (exposure to feared physical sensations) that are not part of CBT for GAD. Exposure to uncertainty is more central in GAD. Identifying which pattern predominates guides therapeutic emphasis.
Treatment
Panic disorder is one of the psychiatric conditions with the best response to treatment. CBT and SSRIs are first-line treatments, with response rates of 70-90%.
CBT for Panic
CBT for panic disorder is highly structured and effective. Its components include: psychoeducation (understanding that the attack is not dangerous), cognitive restructuring (correcting catastrophic interpretations), breathing training (controlling hyperventilation), and interoceptive exposure (controlled exposure to feared sensations).
Interoceptive exposure is particularly effective: the patient is deliberately exposed to panic sensations (spinning in a chair for dizziness, controlled hyperventilation for tingling, exercise for tachycardia) in a safe setting, learning that these sensations are not dangerous.
MEDICATIONS FOR PANIC DISORDER
| MEDICATION | CLASS | TIME TO EFFECT | NOTES |
|---|---|---|---|
| Sertraline (50-200 mg) | SSRI | 4-6 weeks | First-line. Start at low dose to avoid initial worsening of anxiety |
| Escitalopram (10-20 mg) | SSRI | 4-6 weeks | First-line. Well tolerated. Start at 5 mg |
| Venlafaxine (75-225 mg) | SNRI | 4-6 weeks | Effective alternative. Risk of abrupt discontinuation symptoms |
| Clomipramine (25-150 mg) | Tricyclic | 4-8 weeks | High efficacy, but more side effects |
| Clonazepam (0.5-2 mg) | Benzodiazepine | Minutes | For acute rescue only (short term). Risk of dependence |
Weeks 1-2
Psychoeducation about panic. Initiation of SSRI at low dose. Diaphragmatic breathing training. Rescue benzodiazepine if needed.
Weeks 3-6
SSRI dose adjustment. Cognitive restructuring — correcting catastrophic interpretations. Introduction of interoceptive exposure.
Weeks 6-12
Progressive interoceptive exposure. Exposure to avoided situations (if agoraphobia is present). Reduction in attacks.
Months 3-6
Consolidation. Most patients show significant improvement. Gradual reduction of benzodiazepines.
6-12+ months
SSRI maintenance for 12-18 months. Evaluation of gradual discontinuation. Relapse prevention.
Acupuncture as Treatment
Acupuncture has been studied as a complementary treatment for panic disorder. The proposed mechanism involves modulation of the autonomic nervous system, with possible attenuation of sympathetic hyperactivity and enhancement of parasympathetic activity — a hypothesis consistent with the autonomic imbalance observed in attacks, but still under investigation.
Studies (mostly in animal models and a few in humans) suggest that acupuncture may modulate circuits involved in autonomic and emotional regulation. The proposed mechanisms are relevant as hypotheses; specific clinical evidence for panic disorder remains limited.
Acupuncture may be particularly useful as an adjunct to CBT and pharmacotherapy, especially for patients with prominent autonomic hyperactivation, chronic muscle tension, and insomnia associated with the disorder. It does not replace first-line treatments.
Prognosis
Panic disorder has an excellent prognosis with treatment. 70-90% of patients reach remission or significant improvement with CBT and/or SSRIs. CBT for panic is one of the psychotherapeutic interventions with the highest success rate in all of psychiatry.
Without treatment, the disorder may be complicated by agoraphobia (fear of leaving home or going to places where escape would be difficult during an attack), depression, alcohol abuse, and progressive social isolation. Once established, agoraphobia makes treatment more complex.
Factors predicting good prognosis include: early initiation of treatment, absence of agoraphobia, good prior functioning, adherence to CBT, and motivation for interoceptive exposure. Relapse is possible but generally responds quickly to retreatment.
Myths and Facts
Myth vs. Fact
A panic attack can cause a heart attack or death.
Although the symptoms are terrifying, panic attacks do not cause heart attack, stroke, or death. The tachycardia of panic does not damage the heart — it is the same physiological response that occurs during intense exercise. The heart is fully capable of supporting that temporary activation.
Myth vs. Fact
During a panic attack, you can 'go crazy' or lose control.
The feeling of 'going crazy' is one of the cognitive symptoms of panic, but it does not correspond to reality. Panic attacks do not cause psychosis or loss of control. The person may feel they are about to lose control, but it does not happen — it is a perception distorted by hyperventilation and amygdala activation.
Myth vs. Fact
People with panic should avoid physical exercise to prevent attacks.
Regular physical exercise is one of the best treatments for panic disorder. Although exercise produces sensations similar to panic (tachycardia, sweating), repeated exposure to those sensations in a safe context is therapeutic — it teaches the brain that they are not dangerous.
When to Seek Help
If panic attacks are affecting your life, know that this is one of the conditions with the best response to treatment. Seeking help can transform your relationship with fear.
Frequently Asked Questions about Panic Attacks
A panic attack is a sudden episode of intense fear or discomfort that peaks within 10 minutes and includes at least 4 of 13 symptoms: palpitations, sweating, trembling, shortness of breath, sense of suffocation, chest pain, nausea, dizziness, chills or hot flashes, paresthesias (tingling), depersonalization/derealization, fear of losing control or "going crazy", and fear of dying. Panic attacks are terrifying but not dangerous — the person will not die, faint (usually), or "go crazy" during the episode.
There is significant overlap: chest pain, palpitations, shortness of breath, and a sense of impending doom occur in both. On first presentation, AMI must always be ruled out with ECG and troponin. Features favoring a cardiac origin: pressure-quality pain radiating to the left arm or jaw, intense nausea, profuse cold sweating, and cardiovascular risk factors. Features favoring panic: absence of risk factors, onset in a context of anxiety, prior history of panic, spontaneous resolution within 20-30 minutes, and a normal ECG.
Panic disorder is the diagnosis established when a person has recurrent and unexpected panic attacks, followed by at least 1 month of persistent anticipatory anxiety (worry about additional attacks or their consequences) and/or significant behavioral changes related to the attacks (avoidance of situations where attacks may occur). It is not simply "having panic attacks" — it is the pattern of fear of fear that perpetuates the disorder.
Panic attacks result from inappropriate activation of the brain's alarm system — the amygdala fires a "fight or flight" response without a real threat. Contributing factors include: genetic predisposition (heritability of 40-50%), anxiety sensitivity (fear of the physical sensations of anxiety), CO2 hypersensitivity, and precipitating factors such as intense stress, caffeine/stimulant intake, substance use or withdrawal, hyperthyroidism, and isolated episodes that become conditioned. The panic cycle is sustained by fear of physical sensations.
Panic disorder has an excellent response to treatment — 70-90% of patients improve. CBT is the first-line treatment: it includes psychoeducation, cognitive restructuring, breathing techniques and, especially, interoceptive exposure (gradual exposure to feared physical sensations). SSRIs are the first-line pharmacotherapy. The combination of CBT + SSRI offers the best results. Benzodiazepines provide rapid relief but do not treat the cause and may sustain the panic cycle.
Agoraphobia is fear and avoidance of situations where escape would be difficult or where help would not be available if a panic attack occurred: public transportation, open spaces, enclosed places, lines, being away from home alone. About 30-40% of patients with panic disorder develop agoraphobia. In severe cases, the person may become unable to leave home. Gradual exposure to avoided situations is an essential part of treatment.
It may be considered as an adjunct. Systematic reviews indicate a signal of possible benefit for anxiety disorders, but with heterogeneous methodological quality — the evidence is insufficient to recommend acupuncture as primary therapy. The proposed mechanisms — modulation of the amygdala, enhancement of the parasympathetic system, and effects on GABA and serotonin — rest mostly on experimental studies. Acupuncture does not replace CBT or SSRIs (first-line treatments), but may be useful as an adjunct to CBT-panic and pharmacotherapy, especially in patients with prominent autonomic hyperactivation, always coordinated with the attending physician.
During an attack: remember that it is temporary and not dangerous — it will pass within 10-20 minutes even without doing anything. Try slow diaphragmatic breathing (inhale 4s, hold 2s, exhale 6s) — this activates the parasympathetic system. Observe the sensations without fighting them — fighting amplifies; acceptance reduces. Grounding: focus on the 5 senses in the present moment. Avoid hyperventilation and avoid fleeing the situation (fleeing reinforces the cycle). With CBT, one learns to "surf" the attack without feeding it, reducing its intensity over the course of treatment.
Yes. Nocturnal panic attacks — abruptly waking from deep sleep with intense terror and physical symptoms — occur in up to 70% of patients with panic disorder. They differ from nightmares: there is no dream content, and the patient wakes up already in full attack. They occur during non-REM sleep stages (2-4 a.m.). They are particularly disturbing because the patient does not understand what happened. Treatment of panic disorder resolves the nocturnal episodes in most cases.
Seek medical evaluation if: it is your first time with intense chest pain — ruling out AMI is the priority; the attacks recur and you are developing anticipatory anxiety; you are avoiding situations out of fear of attacks; your functioning (work, social relationships, leaving home) is impaired; or you are using alcohol/benzodiazepines to prevent attacks. Panic disorder is highly treatable — the great majority of patients reach remission with adequate treatment.
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