Antibiotic Selection for Diabetic Foot Ulcer in a Patient on Peritoneal Dialysis

Infection Assessment and Classification

Diabetic foot infections should be classified as mild, moderate, or severe to guide appropriate antibiotic selection, with consideration of the patient's compromised immune status and impaired wound healing associated with both diabetes and end-stage kidney disease (ESKD) 3, 4

The American College of Physicians and the Infectious Diseases Society of America recommend vancomycin plus ceftazidime as the initial empiric therapy for diabetic foot infections in patients on peritoneal dialysis, providing coverage against gram-positive and gram-negative organisms, including MRSA and Pseudomonas 1
Vancomycin provides coverage against gram-positive organisms including MRSA, while ceftazidime provides coverage against gram-negative organisms including Pseudomonas, in patients with diabetic foot ulcers on peritoneal dialysis 1

The International Working Group on the Diabetic Foot recommends administering antibiotic therapy for 1-2 weeks for most skin and soft tissue diabetic foot infections, with consideration of extending treatment up to 3-4 weeks if the infection is extensive or resolving slower than expected 2, 4
Re-evaluate if evidence of infection has not resolved after 4 weeks of appropriate therapy, as recommended by the American Diabetes Association 2

Avoid underdosing antibiotics, which may lead to treatment failure and development of resistance, as warned by the Infectious Diseases Society of America 3
Do not treat clinically uninfected foot ulcers with systemic or local antibiotic therapy, as advised by the American College of Physicians 2

The American Diabetes Association recommends appropriate wound care, including debridement and pressure off-loading, alongside antibiotic therapy, as well as monitoring glycemic control to aid in eradicating the infection and healing the wound 3, 5