Idiopathic Purulent Pericarditis Caused by Methicillin-Sensitive Staphylococcus Aureus in an Immunocompetent Adult

Area of Science:

• Cardiology
• Infectious Diseases
• Internal Medicine

Background:

• Acute purulent pericarditis is a rare but life-threatening condition, often resulting from direct contamination or bacterial spread.
• Untreated purulent pericarditis carries a near 100% mortality rate.
• Idiopathic bacterial pericarditis is exceptionally uncommon.

Observation:

• A 69-year-old male presented with chest and abdominal pain, indicative of potential cardiac compromise.
• Diagnostic imaging revealed a pericardial effusion with cardiac tamponade.
• Emergent pericardiocentesis was performed to relieve pressure on the heart.

Findings:

• Pericardial fluid cultures identified methicillin-sensitive Staphylococcus aureus (MSSA) as the causative agent.
• The patient required repeated pericardial washouts to manage the infection.
• Treatment involved a four-week course of intravenous antibiotics.

Implications:

• This case underscores the importance of maintaining a high index of suspicion for purulent pericarditis, even in the absence of a clear source.
• Early recognition and aggressive management, including antibiotics and drainage, are critical for improving outcomes in purulent pericarditis.
• The successful treatment of MSSA pericarditis highlights the need for prompt microbiological identification and targeted antimicrobial therapy.