The effect of antibiotics, primary and secondary closure on clostridial contaminated open fracture wounds in rats

Timing of Flap Coverage With Respect to Definitive Fixation in Open Tibia Fractures

OBJECTIVES

We conducted a large, U.S wide, observational study of type III tibial fractures, with the hypothesis that delays between definitive fixation and flap coverage might be a substantial modifiable risk factor associated with nosocomial wound infection.

DESIGN

A retrospective analysis of a multicenter database of open tibial fractures requiring flap coverage.

SETTING

Fourteen level-1 trauma centers across the United States.

PATIENTS

Two hundred ninety-six (n = 296) consecutive patients with Gustilo III open tibial fractures requiring flap coverage at 14 trauma centers were retrospectively analyzed from a large orthopaedic trauma registry. We collected demographics and the details of surgical care. We investigated the patient, and treatment factors leading to infection, including the time from various points in care to the time of soft-tissue coverage.

INTERVENTION

Delay definitive fixation and flap coverage in tibial type III fractures.

MAIN OUTCOME MEASUREMENTS

(1) Results of multivariate regression with time from injury to coverage, debridement to coverage, and definitive fixation to coverage in the model, to determine which delay measurement was most associated with infection. (2) A second multivariate model, including other factors in addition to measures of flap delay, to provide the estimate between delay and infection after adjustment for confounding.

RESULTS

Of 296 adults (227 M: 69 F) with open Gustilo type III tibial fractures requiring flap coverage, 96 (32.4%) became infected. In the multivariate regression, the time from definitive fixation to flap coverage was most predictive of subsequent wound infection (odds ratio 1.04, 95% confidence interval 1.01 to 1.08, n = 260, P = 0.02) among the time measurements. Temporary internal fixation was not associated with an increased risk of infection in both univariate (P = 0.59) or multivariate analyses (P = 0.60). Flap failure was associated with the highest odds of infection (odds ratio 6.83, 95% confidence interval 3.26 to 14.27, P < 0.001).

CONCLUSION

Orthoplastic teams that are dedicated to severe musculoskeletal trauma, that facilitate coordination of definitive fixation and flap coverage, will reduce the infection rates in Gustilo type III tibial fractures.

LEVEL OF EVIDENCE

Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

Preoperative irrigation and vacuum sealing drainage with antibiotic-containing drainage fluid of foot and ankle wounds improves outcome of reconstructive skin flap surgery

Objectives

By observing the infection and soft tissue defect on the wound surface of the foot and ankle, this paper attempts to explore the effect of preoperative irrigation and vacuum sealing drainage with antibiotic-containing drainage fluid (abPI-VSD) on the bacterial quantity and the local inflammatory response at the flap, and further to provide a basis for applying this technique before a reconstructive skin flap surgery of foot and ankle wounds.

Methods

Seventy-five patients were randomly divided into two groups, and all surgeries were done by one physician. The flap reconstructions were done to 31 cases with the abPI-VSD being used (group A); the flap reconstructions were done to the rest 44 cases after wound cleaning using antibiotic irrigation solution without the use of the abPI-VSD (group B). Quantitative bacteriology was made to group A before and after the use of abPI-VSD; quantitative bacteriology was made to group B before and after wound cleaning. Then, the reconstructive skin flap surgery was done. After the surgeries, the time of local inflammatory response at the flap in both groups were recorded. The measured bacterial quantity was evaluated in logarithm and by t test.

Results

The bacterial quantity was 3.2 ± 1.9 × 10⁷ cfu/g in group A before the use of abPI-VSD and 2.3 ± 2.0 × 10⁷ in group B (P > 0.05) before debridement. The bacterial quantity was 1.2 ± 2.0 × 10⁴ cfu/g in group A after abPI-VSD and was 2.9 ± 4.0 × 10⁶ in group B after wound cleaning (P < 0.05). The time of postoperative inflammatory response in the flap was 8 ± 2.5 days in group A and 13 ± 3.4 days in group B (P < 0.05).

Conclusions

abPI-VSD can distinctly reduce the bacterial quantity on the surface of the wound, provide a good condition of tissue bed for the flap reconstruction, and effectively control the local inflammatory response at the flap and hence improve the survival quality of the flap.

Substantial improvement in prophylactic antibiotic administration for open fracture patients: results of a performance improvement program

OBJECTIVES

Administration of early and appropriate antibiotic in treating patients with open fractures is an important early factor in preventing infection and optimizing outcomes. The purpose of this study is to evaluate the effects of an orthopaedic trauma performance improvement program directed at early antibiotic administration for open fracture patients at our trauma center.

DESIGN

Retrospective comparative cohort study of patients treated for an open fracture by before and after implementation of our performance improvement program specifically designed to address early open fracture care.

SETTING

Single metropolitan level 2 regional trauma center.

PATIENTS

Patients with open fractures treated by orthopaedic surgery (hand and spine excluded) at our institution between January 2012 and December 2013 were included. Patients transferred from another facility were excluded.

INTERVENTION

Patients were divided into one of the following 2 groups. Group 1 included patients treated before our open fracture performance improvement program (January 2012-December 2012) and group 2 comprised those treated after the program was instituted (January 2013-December 2013).

MAIN OUTCOME MEASUREMENTS

Patient demographics, injury factors, and performance measures relating to early open fracture care [eg, the characteristics of early antibiotic administration in their treatment course, including timeliness of prophylactic intravenous (IV) antibiotic therapy and reasons for delay or omission of these treatments] were evaluated.

RESULTS

Group 1 was comprised of 127 patients with a total of 142 open fractures, whereas group 2 included 132 patients with a total of 156 open fractures. Patient and injury factors were not significantly different between the 2 groups. Group 1 received IV antibiotics at an average of 70.5 minutes after arrival at our institution compared with group 2 who received antibiotics at an average of 32.4 minutes (P < 0.001). The average times from emergency department arrival to physician evaluation improved from 6.5 to 4.5 minutes (P = 0.02) and antibiotic order to antibiotic delivery improved from 37 to 13 minutes (P < 0.001) for group 1 compared with group 2, respectively. The average time between physician evaluation and antibiotic showed a trend toward improvement (12.7-8.0 minutes, P = 0.57). Fifty percent of patients in group 1 (63/127) had antibiotics initiated within 1 hour of hospital arrival, whereas 78% (100/132) in group 2 had antibiotics initiated within 1 hour (P < 0.001). Eighty-five percent (112/127) of patients in group 1 had antibiotics initiated within 3 hours of hospital arrival, whereas 95% (125/132) in group 2 had antibiotics initiated within 3 hours (P = 0.03). Of those patients receiving standard antibiotics (cephalosporin), 79% (85/107) in group 1 and 91% (104/114) in group 2 received the recommended dose of IV antibiotic for their body weight (e.g., 2 g cefazolin for patients of >80 kg) (P < 0.006).

CONCLUSIONS

Optimal treatment of open fracture patients with early and appropriate antibiotic prophylaxis was lacking for many patients at our trauma center. A multifaceted performance improvement program specifically concentrating on education, accountability, and antibiotic availability aimed at this aspect of orthopaedic trauma care was very effective in improving our early treatment of these patients.

LEVEL OF EVIDENCE

Therapeutic level III. See instructions for authors for a complete description of levels of evidence.

The mangled extremity

The management of patients with severe extremity injuries involves focused efforts at limb salvage and mitigation of potential infectious complications. An in-depth understanding of the proper approach to initial management is essential, as it may impact eventual outcome. The use of established scoring systems may predict those at greater risk and enable expeditious utilization of appropriate consultation services. This case-based review highlights critical aspects of patient care and provides a framework for the role of the Emergency Physician.

Early versus delayed closure of open fractures

The desired outcome in the management of Type III open injuries is not merely salvage but a limb which is functional, painless and aesthetically pleasing. The aim is to also achieve this outcome with the least number of reconstructive surgical procedures and minimal hospital stay. This is now possible by the emergence of many new concepts, by which primary closure is one. While the traditional expected standard of care was to leave the wound open and delay closure, the current evidence favours primary closure in open injuries if the following indications are met: (a) debridement performed within 12h, (b) no skin loss primarily or secondarily during debridement (Ganga Hospital Score [Russell GG, Henderson R, Arnett G. Primary or delayed closure for open tibial fractures. J Bone Joint Surg Br 1990;72:125-8]: score of '1' or '2'), (c) skin approximation possible without tension, (d) no farmyard of gutter contamination, (e) debridement performed to the satisfaction of the surgeon and (f) no vascular insufficiency.

Debridement and wound closure of open fractures: the impact of the time factor on infection rates

Open fracture management represents an orthopaedic emergency. Early aggressive management of these debilitating injuries within the first 6h has been encouraged in order to minimise the risk of infection and long term sequelae. Debridement and wash-out of the wound, followed by stabilisation of the bony elements and closure of the soft-tissue envelope are all considered essential. However, the available scientific evidence supporting the timing of this multistage approach of open fracture management, and the "Six-hour rule" itself, are unclear. This review article analyses the available evidence regarding the impact of the timing of wound debridement and closure of open fractures of the lower extremity.

Prophylactic Antibiotic Use in Open Fractures: An Evidence-Based Guideline

BACKGROUND

Prolonged courses of broad-spectrum antibiotics are often cited as the standard of care for prevention of infective complications of open fractures. The origins of these recommendations are obscure, however, and multi-drug-resistant systemic infections attributable to antibiotic overuse are common life-threatening problems in current intensive care unit practice.

OBJECTIVE

To review systematically the effects of prophylactic antibiotic administration on the incidence of infections complicating open fractures.

DATA SOURCES

Computerized bibliographic search of published research and citation review of relevant articles.

STUDY SELECTION

All published clinical trials claiming to evaluate, or cited elsewhere as being authoritative regarding, the role of antibiotics in open fracture management were identified and then evaluated according to published guidelines for evidence-based medicine. Only small studies (<20 patients), practice surveys, pharmacokinetic studies, and reviews or duplicative publications presenting primary data already considered were excluded from analysis.

DATA EXTRACTION

Information on demographics, study dates, fracture grade, antibiotic type, duration and route of administration, surgical interventions, infection-related outcomes, and the methodologic quality of the studies was extracted by the authors. The primary results were submitted to the Therapeutic Agents Committee of the Surgical Infection Society for review prior to creation of the final consensus document.

DATA SYNTHESIS

Current antibiotic management of open fractures is based on a small number of studies that generally are more than 30 years old and do not reflect current management priorities in trauma and critical care. With a few noteworthy exceptions, these primary studies suffer from a variety of methodologic problems, including co-mingling of prospective and retrospective data sets, absence of or inappropriate statistical analysis, lack of blinding, or failure of randomization.

CONCLUSIONS

The data support the conclusion that a short course of first-generation cephalosporins, begun as soon as possible after injury, significantly lowers the risk of infection when used in combination with prompt, modern orthopedic fracture wound management. There is insufficient evidence to support other common management practices, such as prolonged courses or repeated short courses of antibiotics, the use of antibiotic coverage extending to gram-negative bacilli or clostridial species, or the use of local antibiotic therapies such as beads. Large, randomized, blinded trials are needed to prove or disprove the value of these traditional approaches. Such trials should be performed in patients with high-grade fractures who (1) are well-stratified according to the degree of local injury and (2) undergo standardized fracture and wound management. Trials also must be powered to study the effects of extended antibiotic coverage on nosocomial infections. Antibiotic regimens confirmed to improve local fracture outcomes in such studies could then be used rationally, balancing the risks of local fracture-related infections and of multi-drug-resistant systemic infections to achieve optimal global outcomes.

Management of open fractures

Open fractures are high-energy injuries that require a principle-based approach, starting with detailed evaluation of patient status and injury severity. Early, systemic, wide-spectrum antibiotic therapy should cover gram-positive and gram-negative organisms, and a common regimen is a 3-day administration of a first-generation cephalosporin and an aminoglycoside, supplemented with ampicillin or penicillin to cover anaerobes in farm or vascular injuries. Local antibiotic delivery with the bead pouch technique increases the local concentration of antibiotics, minimizes systemic toxicity, and prevents secondary wound contamination. Thorough irrigation and surgical debridement is critical for prevention of infection. Primary wound closure remains controversial because of concerns for gas gangrene. Partial wound closure is an alternative, with delayed wound closure within 3 to 7 days. In the presence of extensive soft tissue damage, local or free muscle flaps should be transferred to achieve coverage. Stable fracture fixation should be achieved with a method suitable for the bone and soft tissue characteristics. Early bone grafting is indicated for bone defects, unstable fractures treated with external fixation, and delayed union. A management plan guided by the above principles will achieve the goals of prevention of infection, fracture healing, and restoration of function in most of these challenging injuries.

Evaluation of biodegradable cefazolin sodium microspheres for the prevention of infection in rabbits with experimental open tibial fractures stabilized with internal fixation

Immediate internal fixation of severe open tibial fractures usually is contraindicated due to the high risk of infection. The objective of this study was to evaluate the efficacy of local antibiotic therapy with biodegradable poly-(DL-lactide-co-glycolide) cefazolin-loaded microspheres for the prevention of infection in experimental open fractures stabilized with internal fixation. Rabbits with experimental tibial fractures that were contaminated with Staphylococcus aureus were treated with local application of cefazolin microspheres, an equivalent local dose of free Ancef powder, or systemic Ancef therapy. The bones then were fixed with a four-hole plate, and the animals were observed for 8 weeks. Clinically, deep infection was present in 86% of control animals that received no antibiotics and in 60% of animals that received a 7 day course of systemic Ancef therapy. In contrast, no infections were noted among any of the surviving rabbits that received local therapy with either cefazolin microspheres or free Ancef powder. Significantly higher levels of serum cefazolin were measured at 1 h for animals treated with free Ancef powder (18.7 +/- 6.1 micrograms/ml) than for those treated with cefazolin microspheres (0.57 +/- 0.27 micrograms/ml). Follow-up studies are in progress to evaluate further the potential clinical benefits of local antibiotic therapy for the management of contaminated open fractures in humans.