How does the treatment for Staphylococcus aureus infective endocarditis differ based on methicillin susceptibility?
The treatment for Staphylococcus aureus infective endocarditis varies based on methicillin susceptibility. For methicillin-susceptible strains, nafcillin is administered, while methicillin-resistant strains require vancomycin combined with rifampin and gentamicin.
For methicillin-susceptible Staphylococcus aureus (MSSA), the recommended treatment is nafcillin at a dosage of 2 g IV every 4 hours for 4 to 6 weeks. If the strain is methicillin-resistant (MRSA), vancomycin at a dosage of 15-20 mg/kg IV every 8 to 12 hours for 6 weeks is used, often in combination with rifampin and gentamicin. The duration and specific regimen may also vary depending on factors such as the presence of prosthetic valves or renal insufficiency.
Key points
- Methicillin-susceptible S. aureus is treated with nafcillin.
- Methicillin-resistant S. aureus is treated with vancomycin.
- Treatment duration is typically 4 to 6 weeks for MSSA and 6 weeks for MRSA.
- Gentamicin may be added in certain cases for MSSA.
Little and Falace’s Dental Management of the Medically Compromised Patient
James W. Little DMD MS
Ninth Edition · Elsevier, Inc.