Myxedema Heart and Pseudotamponade.

Area of Science:

• Cardiology
• Endocrinology

Background:

• Thyroid hormone is vital for cardiovascular function.
• Severe hypothyroidism can lead to "myxedema heart," characterized by bradycardia and pericardial effusion.
• Large effusions in hypothyroidism typically do not cause tamponade, despite echocardiographic findings.

Purpose of the Study:

• To report on patients with large pericardial effusions from severe hypothyroidism.
• To highlight the discrepancy between echocardiographic tamponade signs and stable hemodynamics.
• To describe bronchial obstruction as a rare complication.

Main Methods:

• Case series of 3 patients with large pericardial effusions due to severe hypothyroidism.
• Review of echocardiographic findings and clinical hemodynamics.
• Literature review on myxedema-associated pericardial effusion.

Main Results:

• Echocardiographic findings suggestive of tamponade were frequent despite stable hemodynamics.
• One case presented with bronchial obstruction due to the large effusion.
• Pseudotamponade phenomenon identified in these cases.

Conclusions:

• Echocardiographic findings in myxedema-associated pericardial effusion may be misinterpreted, leading to unnecessary interventions.
• Understanding pseudotamponade is crucial for appropriate management.
• Conservative medical management is recommended for most cases of myxedema-associated pericardial effusion.