Management of Persistent Cellulitis

Assessment and Rationale for Emergency Department Referral

The Infectious Diseases Society of America guidelines support escalation to intravenous therapy when cellulitis does not respond adequately to oral antibiotics, as seen in patients with persistent symptoms despite previous antibiotic treatment with clindamycin and doxycycline 1
Failure of multiple oral antibiotic regimens is a key indicator for considering intravenous therapy, which is most appropriately initiated in an emergency department setting, especially in patients with ongoing swelling, blisters, and pain 1, 2
The presence of blisters raises concern for a more severe infection that may require closer monitoring and more aggressive treatment, and is an indicator of inadequately controlled infection that may require intravenous antibiotics 2, 3

Most cellulitis is caused by beta-hemolytic streptococci or Staphylococcus aureus, and previous treatment with both clindamycin and doxycycline suggests coverage for both common pathogens including MRSA has been attempted without adequate response 1, 4
Intravenous options for treatment would include vancomycin, daptomycin, linezolid, or telavancin for broader coverage, as recommended by the Infectious Diseases Society of America 1

The patient's history of being on immunosuppressive therapy suggests potential immunocompromise, which is a risk factor for treatment failure and may require more aggressive management, according to the Clinical Microbiology and Infection guidelines 5, 2
Patients with immunocompromise are at higher risk for complications and should have blood cultures obtained when presenting with cellulitis, as recommended by the Clinical Microbiology and Infection guidelines 5

Elevation of the affected leg is an important adjunct to antibiotic therapy to promote drainage of edema and inflammatory substances, as recommended by the Clinical Infectious Diseases guidelines 1, 3
Systemic corticosteroids could be considered as an adjunct to antibiotics in non-diabetic patients to hasten resolution, according to the Clinical Infectious Diseases guidelines 1, 3

After completion of treatment, addressing any underlying conditions that may predispose to recurrence (such as lymphedema or venous insufficiency) is important, as recommended by the Clinical Infectious Diseases guidelines 1, 3