Antibiotic-impregnated grafts for aortic reconstruction

Area of Science:

• Vascular Surgery
• Infectious Diseases
• Biomaterials Science

Background:

• Aortic graft infections pose significant management challenges.
• Current standard practice (extra-anatomical bypass) has suboptimal outcomes and limitations.
• In situ aortic repair is a viable alternative but faces concerns regarding graft durability and reinfection.

Purpose of the Study:

• To evaluate the efficacy of antibiotic-soaked aortic grafts for managing infected aortas.
• To explore the use of rifampin-soaked Dacron grafts in situ for infection resistance and prophylaxis.
• To assess the outcomes and limitations of this technique in human cases.

Main Methods:

• In vitro and in vivo laboratory experiments demonstrating antibiotic binding to grafts.
• Animal models using antibiotic-soaked grafts to test resistance to bacterial challenge and direct inoculation.
• Analysis of human case series on rifampin-soaked Dacron grafts for infected and elective aortic reconstruction.

Main Results:

• Antibiotic-soaked grafts (polytetrafluoroethylene and Dacron) showed resistance to infection in animal models.
• Rifampin-soaked Dacron grafts were successfully used for in situ aortic replacement in infected animal models.
• Human case series indicate 30-day mortality (7-21%) and morbidity (2-60%), with 4-22% reinfection rates and 5-year survival near 50%.

Conclusions:

• Rifampin-soaked Dacron grafts represent a valuable option for in situ aortic repair in infected cases and for prophylaxis.
• While effective, the technique's long-term utility must be weighed against emerging antibiotic resistance and alternative conduits.
• This method remains a crucial tool for vascular surgeons managing complex aortic conditions.