Nonpharmacological factors including being female and having cardiovascular disease have an impact on early response among patients hospitalized with cellulitis, a single-center prospective study found.
“Cellulitis is usually caused by beta-hemolytic streptococci (BHS) susceptible to penicillin and other narrow-spectrum antibiotics,” researchers led by Trond Bruun, MD, of the department of clinical science at the University of Bergen, Norway, wrote in a study published online on July 11, 2016, in Clinical Infectious Diseases.
“However, there are significant treatment challenges, including overuse of broad-spectrum and intravenous antibiotics, difficulties regarding when to initiate rescue therapy and when to stop treatment, as well as frequent recurrences. Toxin effects and profound local inflammation, not necessarily corresponding to bacterial burden or antibiotic needs, may contribute to these problems.”
In an effort to better understand the clinical course, response dynamics, and associated factors involved with cellulitis care, the researchers evaluated 216 patients hospitalized with the condition at Haukeland University Hospital, Norway. They analyzed clinical and biochemical response data during the first 3 days of treatment in relation to baseline factors, antibiotic use, surgery, and outcome (Clin Infect Dis. 2016 Jul 11. pii: ciw463. [Epub ahead of print]).
The median age of the patients was 55 years and 57% had a lower extremity infection. After 1 day of treatment, the researchers found that 55% of evaluable patients (116 of 211) had cessation of lesion spread and 52% (109 of 211) had improvement of local inflammation. Local clinical response – defined as a combination of cessation of lesion spread and improvement of local inflammation – was observed in 39% of patients (82 of 212), while local clinical response or biochemical response was seen in 74% of cases (148 of 200).
Nonpharmacological factors found to predict nonresponse on treatment day 3 were cardiovascular disease (odds ratio, 2.83), female gender (OR, 2.09), and a higher body mass index (OR, 1.03). A shorter duration of symptoms and cellulitis other than typical erysipelas were also predictive of nonresponse on treatment day 3. On the other hand, baseline factors were not predictive of clinical failure assessed post treatment.
Among patients who received antibiotic treatment escalation within 2 days of starting treatment, most (90%) had nonresponse on treatment day 1, but only 5% had inappropriate initial therapy. Nonresponse on treatment day 3 was a predictor of treatment duration exceeding 14 days, but not of clinical failure.
“Overall, the study indicates that nonantibiotic factors with impact on early treatment response should be considered as an integrated part of the clinical management of cellulitis,” the researchers concluded. “This may improve individualization of treatment and reduce costs and unnecessary rescue therapy.”
The study was supported by a research grant from the department of clinical science at the University of Bergen. The researchers reported having no financial disclosures.