Necrotizing soft tissue infections (NSTIs) refer to severe life-threatening bacterial infections involving the dermis, subcutaneous tissue, fascia, or muscle. NSTIs can lead to serious morbidities and mortality. Diagnosis can be challenging, and a high index of suspicion is required. Useful clues include pain out of proportion to skin findings, manifestations of systemic toxicity, and lack of response to systemic antibiotics. While crepitus, hemorrhagic bullae, skin necrosis, skin anesthesia, and symptoms of sepsis are typical of NSTIs, confirming the diagnosis requires surgical exploration .
Management entails early surgical debridement coupled with empiric broad-spectrum intravenous antibiotics against both aerobic and anaerobic organisms in addition to intensive care support. Tissue hypoxia and necrosis induced by NSTIs limit the efficacy of systemic antibiotics, rendering surgical debridement the mainstay treatment .
A Cochrane review  investigated available interventions for NSTIs. The inclusion criteria specified randomized controlled trials of medical or surgical interventions in hospital settings for adults with NSTIs. Adjunctive hyperbaric oxygen therapy was addressed in a prior Cochrane review [ ]. The primary outcome measures were mortality within 30 days and occurrence of serious adverse events, whereas the secondary outcomes were survival time as well as long‐term morbidity assessed via the Functional Impairment Scale [ ].
The authors identified 3 trials comprising 197 participants (n=117, 62% men) with a mean age of 55 years. In all trials, patients received the standard of care (ie, surgical debridement, empiric antibiotics, and intensive care support). The used empiric antibiotics were vancomycin, clindamycin, ciprofloxacin, and piperacillin-tazobactam . One trial compared 2 antibiotic treatments, moxifloxacin 400 mg once daily and amoxicillin‐clavulanate 3 g three times daily for at least 3 days, followed by 1.5 g three times daily [ ]. Another trial evaluated the novel drug AB103, studied also for sepsis, which impairs T-cell activation by blocking the binding of superantigen exotoxins to the CD28 receptor on T‐helper1 lymphocytes [ ]. Two doses (0.5 mg/kg and 0.25 mg/kg) were investigated against the placebo. The third trial assessed intravenous immunoglobulin at a dose of 25 g/day, given for 3 consecutive days, versus a placebo [ ].
In all trials, no difference was detected between groups regarding the primary outcome measures. The quality of evidence was assessed as low to very low; this implies uncertainty in these results. Adverse events, secondary outcomes, and median survival times are summarized in. None of the trials assessed long-term morbidity as defined in the review protocol [ ].
|MXFa vs AM-CLb, Vick-Fragoso et al ||AB103 vs placebo, Bulger et al ||IVIGc vs placebo, Madsen et al |
|Groups||1. MXF 400 mg once daily|
2. AM-CL 3 g three times daily for at least 3 days followed by 1.5 g three times daily
|1. AB103 0.5 mg/kg|
2. AB103 0.25 mg/kg
Single intravenous dose within 6 hours after diagnosis
|1. IVIG 25 g/day for 3 consecutive days|
|Participants, n||54 (MXF group: n=36; AM-CL group: n=18)||43 (AB103 group: n=32; placebo group: n=11)||100 (IVIG group: n=50;|
placebo group: n=50)
|Overall risk of bias||High (attrition, imbalance, performance, detection)||Moderate (attrition)||High (attrition, imbalance)|
|Mortality within 30 days||No difference (RRd 3.00, 95% CI 0.39-23.0)||No difference (RR 0.34, 95% CI 0.05-2.16)||No difference (RR 1.17, 95% CI 0.42-3.23)|
|Certainty of evidence||Very low||Very low||Low|
|Proportion of patients who experienced serious adverse events||Not specified; no difference (RR 0.63, 95% CI 0.30-1.31)||Not specified; no difference (RR 1.49, 95% CI 0.52-4.27)||Acute kidney injury, allergic reactions, aseptic meningitis, hemolytic anemia, thrombi, and infections;|
no difference (RR 0.73, CI 95% 0.32-1.65)
|Certainty of evidence||Very low||Very low||Low|
|Survival time (median time of death)||Shorter in the MXF group (10.5 days vs 42 days); no statistical analysis was possible||Not specified||Shorter in the IVIG group (25 days vs 49 days); no statistical analysis was possible|
|Assessment of long‐term morbidity||Not specified||Not specified||No difference in the median physical component summary scores between groups (mean adjusted difference 1, 95% CI 7-10; P=.81)|
cIVIG intravenous immunoglobulin.
dRR risk ratio.
The quality of the evidence was negatively impacted by attrition bias, indirectness due to the lack of a definition of NSTIs, small sample size, and underpowered analysis. The lack of high-quality evidence for this serious condition necessitates the need for larger, well-designed studies. A recent randomized controlled trial evaluated the efficacy of AB103 0.5 mg/kg versus placebo when administered within 6 hours of NSTI diagnosis . No significant improvement was found in the primary composite endpoint (28-day mortality, number of debridements, amputations after the first operation, and resolution of organ dysfunction) in intention to treat whereas there was in the per-protocol population [ ]. Given the rarity of NSTIs and their complex diagnosis and management, prospective registries are encouraged to provide evidence for effective therapeutic approaches to improve morbidity and mortality.
Conflicts of Interest
BLA has served as a research investigator and/or scientific advisor to AbbVie and Skin Research Institute, LLC.
The views expressed in this paper are those of the authors and in no way represent the Cochrane Library or Wiley.
This article is based on a Cochrane Review previously published in the Cochrane Database of Systematic Reviews 2018, Issue 5, DOI:10.1002/14651858.CD011680.pub2 (see www.cochranelibrary.com for information). Cochrane Reviews are regularly updated as new evidence emerges and in response to feedback, and Cochrane Database of Systematic Reviews should be consulted for the most recent version of the review.
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- Levett D, Bennett MH, Millar I. Adjunctive hyperbaric oxygen for necrotizing fasciitis. Cochrane Database Syst Rev 2015 Jan 15;1:CD007937 [FREE Full text] [CrossRef] [Medline]
- Vick-Fragoso R, Hernández-Oliva G, Cruz-Alcázar J, Amábile-Cuevas CF, Arvis P, Reimnitz P, STIC Study Group. Efficacy and safety of sequential intravenous/oral moxifloxacin vs intravenous/oral amoxicillin/clavulanate for complicated skin and skin structure infections. Infection 2009 Oct;37(5):407-417. [CrossRef] [Medline]
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- Madsen MB, Hjortrup PB, Hansen MB, Lange T, Norrby-Teglund A, Hyldegaard O, et al. Immunoglobulin G for patients with necrotising soft tissue infection (INSTINCT): a randomised, blinded, placebo-controlled trial. Intensive Care Med 2017 Nov;43(11):1585-1593. [CrossRef] [Medline]
- Bulger EM, May AK, Robinson BRH, Evans DC, Henry S, Green JM, ACCUTE Study Investigators. A Novel Immune Modulator for Patients With Necrotizing Soft Tissue Infections (NSTI): Results of a Multicenter, Phase 3 Randomized Controlled Trial of Reltecimod (AB 103). Ann Surg 2020 Sep 01;272(3):469-478. [CrossRef] [Medline]
|NSTI: necrotizing soft tissue infection|
Edited by R Dellavalle, T Sivesind; submitted 29.10.21; peer-reviewed by A Oganesyan, F Kaliyadan; comments to author 22.11.21; revised version received 26.11.21; accepted 28.11.21; published 21.01.22Copyright
©Hadir Shakshouk, Camille Hua, Brandon L Adler, Alex G Ortega-Loayza. Originally published in JMIR Dermatology (http://derma.jmir.org), 21.01.2022.
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