St. John's Wort-Induced Supraventricular Tachycardia

Area of Science:

• Cardiology
• Pharmacology
• Herbal Medicine

Background:

• St. John's wort (Hypericum perforatum) is a popular over-the-counter herbal supplement used for depression.
• Its mechanism of action is not fully understood, and it is not FDA-approved.
• Potential adverse effects, particularly cardiac events, are not well-documented.

Observation:

• A 33-year-old female presented with recurrent palpitations.
• Symptoms began one month after initiating St. John's wort for depression.
• The patient had no history of cardiac abnormalities or other relevant medical conditions.

Findings:

• The patient experienced supraventricular tachycardia (SVT).
• Episodes resolved completely upon discontinuation of St. John's wort.
• This is the first documented case linking St. John's wort use to SVT.

Implications:

• The use of St. John's wort as an over-the-counter supplement may pose risks for cardiac arrhythmias like SVT.
• Further research is needed to elucidate the pathophysiology and identify at-risk individuals.
• This case highlights the importance of considering herbal supplements in differential diagnoses for unexplained cardiac events.