Management of Acute Tachycardia with Severe Untreated Anxiety

Immediate Assessment and Diagnostic Considerations

The American Heart Association recommends obtaining a 12-lead ECG immediately to document the rhythm and rule out a primary cardiac arrhythmia, as anxiety and supraventricular tachycardia (SVT) present with nearly identical symptoms and distinguishing between them is critical for appropriate management 1, 2
The American College of Cardiology suggests checking vital signs and attaching cardiac monitoring to assess current heart rate and rhythm 3
A 12-lead ECG is essential even though the episode has resolved, as it may show pre-excitation (delta waves suggesting WPW syndrome) or other abnormalities that indicate the type of tachycardia 4, 2
Assessing for hemodynamic stability by checking for chest pain, shortness of breath, hypotension, or altered mental status is crucial 3

The American Heart Association states that PSVT is frequently misdiagnosed as panic disorder because symptoms are nearly identical: palpitations, chest discomfort, dyspnea, and lightheadedness 4, 1
Sinus tachycardia from anxiety typically has gradual onset and termination, whereas PSVT has abrupt onset and termination 4, 1
Episodes lasting 2 hours are more consistent with PSVT (specifically AVNRT or AVRT) than simple anxiety 4

The American College of Cardiology recommends a 12-lead ECG to look specifically for pre-excitation pattern (short PR interval, delta wave) suggesting WPW syndrome 4, 2
Basic labs, including thyroid function (TSH), complete blood count, and basic metabolic panel, are necessary to exclude reversible causes 5, 2
An echocardiogram to assess for structural heart disease is recommended 5, 2
Ambulatory monitoring (Holter monitor or event recorder) to capture future episodes is necessary, as recurrent paroxysmal palpitations require rhythm documentation 4, 6

The American Heart Association suggests referring to a cardiac electrophysiologist for any documented wide-complex tachycardia, presence of pre-excitation on baseline ECG with history of paroxysmal regular palpitations, recurrent episodes of regular, paroxysmal palpitations with abrupt onset/termination, or disabling symptoms or drug resistance/intolerance 7, 6, 4, 1

The American College of Cardiology recommends not dismissing the anxiety as the sole cause until cardiac evaluation is complete, and addressing anxiety with appropriate psychiatric referral and treatment if cardiac workup is negative 2

The American Heart Association advises not assuming this is "just anxiety" without proper cardiac evaluation, and not prescribing benzodiazepines as first-line treatment without ruling out cardiac causes 3
The American College of Cardiology suggests not using AV nodal blocking agents if pre-excitation is present on ECG, as this can be dangerous in atrial fibrillation with WPW 3

The American College of Cardiology recommends instructing the patient to seek immediate emergency care if tachycardia recurs with heart rate persistently >150 bpm, syncope or near-syncope, or severe chest pain or shortness of breath 6, 3, 2
Scheduling cardiology follow-up within 1-2 weeks for review of test results and further management planning is necessary 2