[Conn's syndrome and severe arrhythmias]

Area of Science:

• Endocrinology
• Cardiology
• Internal Medicine

Background:

• Conn's syndrome, or primary hyperaldosteronism, is characterized by excessive aldosterone secretion from the adrenal glands.
• It is often caused by an adrenal adenoma or bilateral adrenal hyperplasia.
• Commonly presents with hypertension and hypokalemia, but cardiac arrhythmias can be initial or presenting symptoms.

Observation:

• The case involves a patient presenting with "lone" atrial fibrillation, initially without identifiable organic cardiac causes.
• The underlying pathology was found to be a solitary cortical adenoma of the adrenal gland (Conn's syndrome).
• Variable serum potassium levels and anti-arrhythmic drug treatment for atrial fibrillation were noted.

Findings:

• A solitary adrenal adenoma (Conn's syndrome) was the cause of the patient's atrial fibrillation.
• Fluctuations in serum potassium levels acted as a trigger for ventricular tachycardia.
• Treatment for atrial fibrillation with anti-arrhythmic medications contributed to the life-threatening cardiac event.

Implications:

• This case highlights the importance of considering endocrine disorders like Conn's syndrome in patients with unexplained arrhythmias.
• It underscores the critical role of electrolyte balance, particularly potassium, in managing cardiac rhythm disturbances.
• Early diagnosis and management of adrenal adenomas are crucial to prevent severe cardiac complications.