Severe Hyponatremia-Induced Takotsubo Cardiomyopathy

Area of Science:

• Cardiology
• Endocrinology

Background:

• Syndrome of Inappropriate Antidiuretic Hormone secretion (SIADH) can cause chronic hyponatremia.
• Hyponatremia is a condition characterized by low serum sodium levels.

Observation:

• A 79-year-old woman with SIADH-induced hyponatremia presented with chest pain and elevated cardiac enzymes.
• Electrocardiogram revealed T wave inversions; echocardiography showed apical akinesia.
• Coronary angiography demonstrated unobstructed coronary arteries.

Findings:

• The patient was diagnosed with severe hyponatremia (serum sodium 122 mmol/L).
• Takotsubo cardiomyopathy (TCM) was diagnosed based on clinical presentation, ECG, echocardiography, and ventriculography.
• Treatment with fluid restriction and demeclocycline led to sodium normalization and symptom improvement.

Implications:

• This case suggests a potential causal link between severe hyponatremia and Takotsubo cardiomyopathy.
• Severe hyponatremia should be considered as a precipitating factor for TCM, especially in the absence of other stressors.
• Understanding this association can improve diagnostic and therapeutic strategies for patients presenting with cardiac symptoms and electrolyte imbalances.