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My working diagnosis is panic disorder. The patient is a 34-year-old woman with three ED visits for palpitations, sweating, and a feeling of doom. Don't confirm it- challenge it. Which findings would argue against panic disorder, and where might I be anchoring?

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anchoring bias cognitive bias emergency department diagnostic error

I now have strong textbook and research grounding. Here is the full critical challenge:

Challenging Your Working Diagnosis of Panic Disorder

Panic disorder is a diagnosis of exclusion. Harrison's is explicit: "A diagnosis of panic disorder is made after a medical etiology for the panic attacks has been ruled out. A variety of cardiovascular, respiratory, endocrine, and neurologic conditions can present with anxiety as the chief complaint." Three ED visits without a definitive organic workup is not the same as a ruled-out organic cause - it may simply mean no one has looked hard enough yet.
Here is what should be making you uncomfortable:

1. Pheochromocytoma - the classic trap

The triad of paroxysmal palpitations + sweating + feeling of doom is textbook pheo. Robbins describes it precisely: "paroxysmal episodes... abrupt, precipitous elevation in blood pressure associated with tachycardia, palpitations, headache, sweating, tremor." Kaplan & Sadock notes that the combination of palpitations, headache, and profuse sweating is "the most sensitive and specific" symptom cluster for pheo.
Arguments against panic here: Did anyone check BP during an attack? Sustained or paroxysmal hypertension, headache, pallor, and postural hypotension are red flags. Has anyone ordered plasma or 24-hour urine metanephrines? In a 34-year-old woman with episodic autonomic surges, this is non-optional.

2. Paroxysmal Supraventricular Tachycardia (SVT) / Arrhythmias

Harrison's specifically lists paroxysmal atrial tachycardia as a cardiovascular condition to rule out with ECG and echocardiogram. SVT causes sudden-onset palpitations, near-syncope, and terror that patients describe in exactly the language of panic. Critically, the termination can be abrupt - unlike the typical gradual resolution of a panic attack (which takes ~1 hour per DSM criteria). WPW and other accessory pathway tachycardias are entirely possible in a young woman.
What to ask: Does the palpitation start and stop suddenly (on/off switch quality)? Does it respond to Valsalva? Has a resting ECG been done in all three visits - and was the delta wave looked for? Has she had continuous monitoring (Holter, event monitor, implantable loop recorder if needed)?

3. Thyrotoxicosis

Heat intolerance, palpitations, weight loss, tremor, and anxiety are the constellation. TSH is a cheap, easy test. In a woman of reproductive age this includes both Graves disease and Hashimoto's thyrotoxic phase. A normal TSH rules this out; has it been checked?

4. Hypoglycemia

Episodic sweating, palpitations, and feelings of doom triggered by the autonomic response to low glucose - especially relevant if attacks happen in a fasting state, post-exercise, or in the context of alcohol use or diabetes medications. Timing relative to meals is a simple but often unasked question.

5. Carcinoid Syndrome and Mastocytosis

Less common but worth flagging for completeness in someone with recurrent unexplained autonomic episodes. Carcinoid produces flushing, palpitations, and diarrhea; mastocytosis can produce episodic anaphylactoid reactions with profound cardiovascular symptoms and doom.

6. Neurologic Causes - Temporal Lobe Seizures

Ictal fear, autonomic discharge, and depersonalization can be indistinguishable from panic attacks on history alone. A patient will not describe them as seizures. The feeling of doom is actually a recognized aura of temporal lobe epilepsy.

7. Mitral Valve Prolapse

Harrison's mentions it specifically in the panic differential. Most cases of MVP are benign, but in the subset with significant regurgitation or dysautonomia, palpitations and chest pain can be prominent. An echocardiogram addresses this directly.

Where You Are Likely Anchoring

Anchoring bias is locking onto the first plausible framing (anxiety/panic) and interpreting all subsequent information through that lens. Several mechanisms are operating here:
  • Demographic anchoring: A 34-year-old woman with palpitations and emotional distress fits the cultural prototype of panic disorder. This is a known and well-documented bias; studies on cognitive bias in emergency medicine (Dargahi et al., 2022; Kunitomo et al., 2022 [PMID 36028810]) confirm anchoring as the most common diagnostic error in ED physicians.
  • Representativeness heuristic: Her presentation matches the textbook panic attack description so well that alternative diagnoses feel unnecessary. But pheo, SVT, and thyrotoxicosis were deliberately included in textbooks precisely because they match this description.
  • Search satisficing after three visits: Three visits creates a false sense that "if it were something serious, we'd have found it by now." But nothing in three ED visits for palpitations guarantees that anyone sent plasma metanephrines, did a 24-hour Holter, or measured BP during an attack.
  • Premature closure: Psychiatric diagnoses are especially vulnerable to premature closure because they require no confirmatory test - the diagnosis is made by symptom pattern, which the same organic diseases can replicate perfectly.
  • The "young woman" frame: This demographic is statistically over-represented in panic disorder diagnoses and simultaneously under-investigated for organic pathology. Several studies document that women's cardiovascular and endocrine symptoms are more frequently attributed to anxiety than men's.

What Would Actually Argue For Panic Disorder (Things to Confirm)

Before you're satisfied, you need to be able to say yes to most of these:
  • TSH, plasma/urine metanephrines, glucose during attack - normal
  • 12-lead ECG in all three visits - no delta wave, no prolonged QT, no LBBB
  • BP during attacks documented - not hypertensive
  • Attack onset and offset gradual, not abrupt (not SVT quality)
  • No headache with attacks (reduces pheo likelihood)
  • No skin flushing, diarrhea, or wheezing (reduces carcinoid/mastocytosis)
  • No clear ictal features or post-event confusion (reduces seizure)
  • Family history of panic disorder (supporting genetic predisposition per Harrison's)
  • Attacks respond to the cognitive arousal cycle - anticipatory anxiety, agoraphobia developing over time
Bottom line: The symptoms are real and the panic disorder label may ultimately be correct, but right now the workup has been reactive rather than systematic. A 34-year-old woman with three visits and no clear organic exclusion has not had panic disorder confirmed - she has had an organic cause not yet tested for. Pheo and SVT, in particular, deserve active exclusion before you commit to a psychiatric label and treatment pathway.
  • Harrison's Principles of Internal Medicine 22E (2025), Anxiety Disorders / Panic Disorder section
  • Kaplan & Sadock's Comprehensive Textbook of Psychiatry, Adrenal Disorders section
  • Robbins, Cotran & Kumar Pathologic Basis of Disease, Pheochromocytoma
  • Kunitomo K et al. Cognitive biases in the emergency room. BMC Emerg Med. 2022 [PMID 36028810]
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