Severe hypothyroidism presenting with supraventricular tachycardia

Area of Science:

• Endocrinology
• Cardiology

Background:

• Thyroid disease is prevalent and impacts multiple organ systems, including the cardiovascular system.
• Hypothyroidism typically presents with bradycardia and conduction abnormalities, but arrhythmias are less common.

Observation:

• A patient presented with presyncope and supraventricular tachycardia.
• The patient was diagnosed with severe hypothyroidism.

Findings:

• Treatment with thyroxine replacement led to biochemical normalization and resolution of the supraventricular tachycardia.
• This suggests a potential etiological role for hypothyroidism in causing supraventricular tachycardia.

Implications:

• This case highlights a rare but significant association between hypothyroidism and supraventricular tachycardia.
• It underscores the importance of considering thyroid dysfunction in patients presenting with cardiac arrhythmias, even those typically associated with hyperthyroidism.