Speech-induced Atrial Tachycardia with Presyncope

Area of Science:

• Cardiology
• Electrophysiology
• Internal Medicine

Background:

• Speech-induced atrial tachycardia (AT) with presyncope is an exceptionally rare clinical presentation.
• Understanding triggers for supraventricular tachycardias is crucial for effective patient management.

Observation:

• A 52-year-old female supermarket employee presented with recurrent presyncope episodes associated with loud vocalization at work.
• Ambulatory ECG monitoring identified AT during swallowing, but without presyncope.
• A tilt table test precipitated AT and presyncope specifically when the patient loudly uttered the Japanese greeting "IRASSHAIMASE".

Findings:

• The patient's blood pressure significantly dropped during episodes of AT.
• The tilt table test successfully demonstrated a direct correlation between AT, hemodynamic compromise, and presyncope in response to a specific vocal stimulus.
• Pharmacological intervention with a low dose of bisoprolol (1.25 mg) completely resolved the presyncope episodes and prevented AT recurrence for two years.

Implications:

• This case highlights the utility of provocative testing, such as the tilt table test, in diagnosing rare conditions where symptoms are triggered by specific activities.
• It suggests that even subtle physiological responses to stimuli like speech can precipitate significant arrhythmias and hemodynamic instability.
• The successful management with a beta-blocker indicates a potential role for autonomic modulation in speech-induced tachycardias.