Septic Thrombophlebitis with Persistent Methicillin-Resistant Staphylococcus Aureus Bacteremia and de Novo Resistance...

Area of Science:

• Infectious Diseases
• Antimicrobial Resistance
• Cardiovascular Surgery

Background:

• Persistent methicillin-resistant Staphylococcus aureus (MRSA) bacteremia is a critical clinical challenge, particularly in patients with prosthetic devices.
• Central venous catheter-related infections are a common source of healthcare-associated bacteremia.

Observation:

• A patient with a prosthetic aortic valve developed MRSA bacteremia originating from a central venous catheter.
• Septic thrombus formation in the superior vena cava complicated the infection.
• The MRSA strain demonstrated emergent resistance to vancomycin, rifampin, and daptomycin despite appropriate antimicrobial therapy.

Findings:

• Standard treatment, including catheter removal and multiple antibiotics, failed to clear the persistent MRSA bacteremia.
• Salvage therapy combining high-dose daptomycin with trimethoprim-sulfamethoxazole was ultimately successful in eradicating the infection.

Implications:

• This case underscores the increasing difficulty in treating complex MRSA infections due to evolving antimicrobial resistance.
• Novel therapeutic strategies, such as combination antibiotic regimens, may be crucial for managing multidrug-resistant bacterial infections.
• Vigilance in monitoring treatment response and microbial susceptibility is essential in high-risk patient populations.