The frequency of colonization and intracellular localization of nontypeable Haemophilus influenzae (NTHi) in the lower respiratory tract was determined in healthy adults and in clinically stable and acutely ill chronic bronchitis (CB) patients. NTHi was recovered from bronchial wash or bronchial brush specimens in 6 of 23 (26%) stable CB patients and in 1 of 15 (7%) CB patients with a respiratory exacerbation. No NTHi (0 of 26) was recovered from lower tract specimens of healthy adults undergoing anesthesia for elective surgery. Molecular typing of NTHi strains revealed that five of nine patients with stable CB had different strains in upper respiratory tract and bronchial wash/brush specimens collected simultaneously. Four stable patients with CB had different strains recovered on repeat bronchoscopy. These results demonstrate the frequent colonization of the lower airways of stable CB patients with multiple strains of NTHi. Bronchial biopsies also were examined for intracellular NTHi by in situ hybridization and immunofluorescence microscopy. Intracellular NTHi were found in 0 of 7 healthy adults, 8 of 24 patients with clinically stable CB, and 13 of 15 acutely ill CB patients. This observation suggests a role for intracellular infection by NTHi in the pathogenesis of exacerbations of CB.
Background: The 2017 U.S. Centers for Disease Control and Prevention (CDC) guidelines for the prevention of surgical site infection (SSI) recommended against continuation of antibiotics postoperatively after total joint arthroplasty. This is disconcerting, as the revised guidelines are based on only 6 orthopaedic studies, of which 83% (5 of 6) were published from 1987 to 1991. The purpose of the current study was to conduct a systematic review and meta-analysis of the literature regarding the efficacy and duration of surgical antibiotic prophylaxis (SAP) in total joint arthroplasty. Methods: PubMed, Ovid MEDLINE, and Ovid Embase were screened for “surgical antimicrobial prophylaxis orthopedic,” in accordance with PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, without a specified time frame with respect to publication date. A total of 693 studies were screened, and 32 studies were evaluated. Data were extracted regarding antibiotic type, number of doses, and duration. Prospective and retrospective studies examining perioperative antibiotics with subsequent SSI and periprosthetic joint infection (PJI) rates in total joint arthroplasty were included. Results: Twenty-three randomized controlled trials (RCTs) and 2 prospective cohort, 3 retrospective cohort, and 4 case-control studies with a total of 51,627 patients were included in this review. The overall pooled effect for the comparison between a single preoperative dose of antibiotic and continued (preoperative plus postoperative) administration was 0.96 (95% confidence interval [CI], 0.73 to 1.26), suggesting no difference in effect. However, the 95% CI for the relative risk would include a reduction of approximately 27% in either group. The overall pooled effect from the comparison between SAP of ≤24 and >24 hours postoperatively demonstrated no difference in effect. All included studies were underpowered and heterogenous regarding type of antibiotic used and duration. Conclusions: Our review confirms the benefit of SAP utilization in total joint arthroplasty. The available evidence does not show added benefit of postoperative SAP or continuation beyond 24 hours. However, the overall GRADE (Grading of Recommendations Assessment, Development and Evaluation) of evidence of the available literature was low (high risk of bias, high risk of publication bias, and low precision). The findings of this study demonstrate the need for Level-I studies with adequate power to evaluate the safety of shortened SAP duration after total joint arthroplasty and its effect on SSI/PJI prior to widespread implementation. Level of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.
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