Lactate-Based Scoring System in the Diagnosis of Necrotizing Fasciitis.

Necrotizing fasciitis (NF) is a rare and quickly progressing infection and leads to 100% mortality if untreated. Quick diagnosis and an early and radical surgical treatment are essential for stopping bacterial progression. Unfortunately, the absence of clear clinical signs makes the diagnosis often challenging. Therefore, we searched for easy determinable predictive laboratory markers for NF. This is the first study which includes lactate values in a new score. A retrospective analysis of patients with NF (n = 44) and patients with erysipelas (n = 150) was performed. Lactate values, patients' demographics, clinical presentations, site of infection, comorbidities, microbiological and laboratory findings, antibiotic therapies, and LRINEC and modified LRINEC scores were analyzed. Logistic regression analysis was used to derive adjusted weights, and final simple point score was assessed with a ROC curve analysis. Patients with NF had a mean age of 57 years and patients with erysipelas 65 years. The median hospital length of stay was 8 and 49 days in patients with erysipelas and NF, respectively. Although only one patient (0.7%) in the group of erysipelas died, the mortality rate of patients with NF was 9/44 (20.5%). The lactate values were statistically significant higher in the NF group, 4.1 vs 2.0 mmol/l (P < .001). The new created CologNe-FaDe-score shows the highest AUC-value with 0.907. With the help of lactate values, the CologNe-FaDe-score consists of easily practicable and highly available parameters, which could sensitize diagnosis.