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Research ArticleLumbar Spine

What Factors Predict Failure of Nonsurgical Management of a Lumbar Surgical Site Infection?

CHRISTOPHER J. LUCASTI, MYLES DWORKIN, KRIS E. RADCLIFF, KRISTEN NICHOLSON, CHRISTOPHER J. LUCASTI and BARRETT I. WOODS
International Journal of Spine Surgery June 2019, 13 (3) 239-244; DOI: https://doi.org/10.14444/6032
CHRISTOPHER J. LUCASTI
1Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania
2Department of Orthopaedic Surgery, Thomas Jefferson University and The Rothman Institute, Philadelphia, Pennsylvania
BS
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MYLES DWORKIN
1Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania
2Department of Orthopaedic Surgery, Thomas Jefferson University and The Rothman Institute, Philadelphia, Pennsylvania
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KRIS E. RADCLIFF
2Department of Orthopaedic Surgery, Thomas Jefferson University and The Rothman Institute, Philadelphia, Pennsylvania
MD
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KRISTEN NICHOLSON
2Department of Orthopaedic Surgery, Thomas Jefferson University and The Rothman Institute, Philadelphia, Pennsylvania
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CHRISTOPHER J. LUCASTI
3South Jersey Infectious Disease, Somers Point, New Jersey
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BARRETT I. WOODS
2Department of Orthopaedic Surgery, Thomas Jefferson University and The Rothman Institute, Philadelphia, Pennsylvania
MD
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ABSTRACT

Background: One of the most frequent complications of invasive lumbar spine surgery is postoperative surgical site infections (SSIs). Although there are absolute criteria for surgical intervention (progressive neurologic deficit, sepsis, failure of medical management), the treatment of routine, uncomplicated SSIs remains somewhat unclear. The purpose of this study was to evaluate the outcome of a series of patients with postoperative surgical site infections who were treated with or without surgical intervention. The primary clinical outcome was the assessment of whether medical management alone would be sufficient to eradicate the infection.

Methods: A retrospective review of consecutive patients who underwent lumbar surgery complicated by spine infection between 2011 and 2017 was performed in order to determine what factors, if any, resulted in the need for additional surgical management. Medical records were reviewed for various demographic (e.g., age), clinical (e.g., organism), and surgical (e.g., presence of instrumentation) factors. A regression analysis was performed to identify what variables significantly increased the risk for SSI.

Results: During the 6-year period studied, a total of 74 patients met the inclusion criteria and were included in the study. There were 13 patients who failed medical management and required additional surgical management, which included irrigation and debridement. Thus, overall, medical management alone was effective in 82% of patients. In the final multivariate logistic regression analysis model, revision primary surgery had the strongest association with SSI that would require a washout. In addition, diabetes had a strong association with the occurrence of an infection.

Conclusions: Identification of risk factors associated with the need for additional surgical management may benefit from aggressive antibiotic therapy to reduce the likelihood of reoperation. Clinicians should be aware of the identified risk factors, which may help with postoperative management in at-risk individuals

  • infection
  • irrigation and debridement
  • lumbar surgery
  • nonsurgical management
  • SSI

INTRODUCTION

Spine surgery is one of the most common surgical procedures performed in the United States, with approximately 1 million cases in 2011.1 This number has increased rapidly during the past decade and is predicted to continue to rise.1 Spine surgery is indicated for a number of diagnoses, including fractures or dislocations, degeneration, spinal cord injuries, congenital anomalies, and inflammatory spondylopathy.2 One of the most serious complications of spine surgery is postoperative surgical site infections (SSI).3 The literature reports that rates following spine surgery may range from 0.7% to 11.9% depending on factors such as surgical approach, instrumentation use, preoperative symptoms, intervertebral levels effected, and patient demographics.4–7 A number of variables have been shown to increase the risk of SSI following spine surgery, including obesity, drug or alcohol use, and diabetes.8 Risk factors should be minimized preoperatively in order to lower incident rates.9

Spinal SSIs have far-reaching impacts on both patient outcomes and health care economics. Direct costs, such as longer hospital stay; frequent procedures, including irrigation and debridement; and additional radiologic tests can add a significant financial burden to all parties involved.10 A single infection may cost an additional $15 800 to $43 900, which is 4 times greater than the initial surgery.11 During the course of a year this may lead to hospital systems paying more than $2 000 000.12 SSIs also greatly impact patient recovery. They have been shown to increase length of hospital stay by more than 5 days and readmission rates by 600%.12 SSIs may also reduce quality of life and prolong rehabilitation.13 Furthermore, treatment of SSIs is difficult and complicated, especially in those patients with instrumentation present.14

SSIs may be treated surgically or medically. The absolute criteria for surgical intervention include progressive neurologic deficit, sepsis, and failure of medical management.15 In the absence of these indicators, however, the treatment of routine, uncomplicated SSIs remains unclear. Revision surgery is associated with risk of perioperative anesthesia complications, increased pain, and additional infections.16 Surgery, however, can avert sepsis and the development of a permanent neurologic deficit.15 Medical management with antimicrobial agents or negative pressure dressings may be preferred for uncomplicated superficial SSIs, but this risks treatment failure.17 The clinical distinction between surgical and medical management has not been well defined. The purpose of this study is to evaluate the outcome of a series of patients with postoperative lumbar SSIs who were treated with or without surgical intervention.

METHODS

A retrospective review of consecutive patients who underwent lumbar surgery complicated by spine infection between 2011 and 2017 was performed in order to determine what factors, if any, resulted in the need for additional surgical management. During this interval, one author (an infectious disease specialist) was responsible for the medical management of the infections. Inclusion criteria were patients 18 and older at the time of surgery who had a proven SSI in the lumbar spine. The analysis excluded patients who underwent cervical (n = 13) or thoracic (n = 2) surgery, as well as patients with less than 30 days of follow-up data (n = 6). Patients with less than 30 days of follow-up data were excluded from the study because of the inability to determine whether the infection was cleared or if the patient followed up with a practitioner outside of the study.

Medical records were reviewed for various demographic (e.g., age, sex), clinical (e.g., organism), and surgical (e.g., presence of instrumentation) factors. The primary clinical outcome was the assessment of whether medical management alone would be sufficient to eradicate the infection, which was determined based on follow-up laboratory data. In this study, revision surgery was defined as a patient requiring removal of hardware for an unsuccessful previous surgery done at an outside hospital. The statistical computing environment R was used to perform multivariate logistic regression model to identify independent risk factors for failure of medical management.

RESULTS

During the 6-year period studied, a total of 74 patients met the inclusion criteria and were included in the study. The average age of the cohort was 53.3 years; 47 patients (63.5%) were male and 27 (36.5%) were female. The average body mass index (BMI) of the entire study cohort was 30.74. A total of 17 patients (22.9%) were smokers and 14 (18.9%) were diabetic. The average time from the operation to the diagnosis of the infection was 20.0 days. Two infections could be classified as late infections because they occurred >90 days after the index surgery.

The most common microorganism isolated from the cultures obtained from the surgical wounds was Staphylococcus aureus (S aureus), which was found in 51.3% of the cases. Other cultured microorganisms were Pseudomonas, Escherichia coli, Streptococcus, and coagulase-negative S aureus.

A total of 22 patients (29.7%) were treated with a wound vacuum assisted closure (VAC) during their management. The average white blood cell (WBC) count, C-reactive protein (CRP), and erythrocyte sedimentation rate (ESR) on presentation were 8.6 μL, 22.9, and 41.8, respectively.

There were 13 patients that failed medical management and required additional surgical management, which included irrigation and debridement (I&D). Thus, overall, medical management alone was effective in 82% of patients. The average age of these patients who required a second surgery was 47 ± 17 years. There were 11 women (84.6%) who required I&D compared with 2 men (15.4%) who required I&D. The average BMI of these patients was 32.9. A total of 5 of the patients requiring I&D were smokers (38.4%), and 4 (30.7%) were diabetic. A total of 6 of the 13 patients who had a secondary surgery (46.1%) were treated first with a VAC prior to undergoing surgical management. The average WBC count, CRP, and ESR of those patients requiring I&D were 7.6 μL, 16.5, and 28, respectively.

There were 61 patients who did not fail medical management, and their infections were resolved without the need for further surgical intervention. The average age of these patients was 50 ± 15 years (P = .045). There were 36 women (59.0%) and 25 men (41.0%; P = .038). The average BMI of these patients was 28.4 (P = .796). A total of 12 of the patients medically managed were smokers (19.7%; P = .129) and 10 were diabetic (16.4%; P = .008). Sixteen of the patients (26.2%) were treated with a VAC during their management (P = .091). The average WBC count, CRP, and ESR of those patients who were medically managed were 8.5 μL, 3.3, and 31, respectively (P = .665; P = .037; P = .180).

The results of the multivariate logistic regression model to identify independent risk factors for failure of medical management are listed in Table 1. In the final model, revision primary surgery had the strongest association with SSI that would require a washout, with an odds ratio (OR) of 63.52. In addition, diabetes had a strong association with the occurrence of an infection, with an OR of 33.49. Other variables that had a strong association with SSI include female sex, OR 9.90; smokers, OR 5.21; use of a VAC, OR 4.90; CRP, OR 1.02; and age, OR 0.93.

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Table 1

Multivariate logistic regression model identifying independent risk factors for failure of medical management.

Regression Analysis

Univariate analysis identified 6 variables initially (CRP, obesity, sex, smoking, diabetes, VAC) at the 0.25 α level using the Wald χ2 statistic (Table 1). In the initial multivariate, obesity was removed because it was not significant (P = .430), and its removal did not change any remaining parameter estimates by more than 20%. Although VAC use was not significant at the 0.15 α level (P = .192), removing this variable did change the parameter estimate for smoking by 23%, so it was retained. The remaining variables (CRP P = .082; sex P = .101; smoking P = .082; diabetic P = .018) were all retained for being significant at the α = 0.15 level.

Of the variables that were not initially significant at the 0.25 level, only age and revision were included back in the model when tested with the 5 retained covariates; both were significant at the 0.15 α level and both changed parameter estimates by more than 20%. The final multivariable model included CRP, sex, smoking status, diabetes, VAC, age at index procedure, and revision (Table 2).

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Table 2

Final main effects model.

Of the retained variables, only age and diabetes had a significant association. Diabetic patients had a mean age of 14 years older than nondiabetic patients. The variable inflation factor (VIF) values for our final model had a range of 1.4 to 2.2, suggesting multicollinearity does not have a considerable effect on our variable selection in the final model.

Backward stepwise regression for a full model was not possible without an initial paring of variables. There were too many exploratory variables for the sample size; an attempt to run such a model did not converge. Forward stepwise regression yielded CRP, sex, smoking status, diabetes, age at index, and radiologic aspiration. It did not include revision or VAC use. The radiologic aspiration variable was not retained in our purposeful selection model but was retained in the forward selection and had a P value of .995 and an OR <0.001. In both the forward selection and purposeful selection models, age had an odds ratio of <1. Excluding the aforementioned radiologic aspiration variable, the remaining variables in both models had ORs >1. Not unexpectedly, there are small differences in the final model with the 2 approaches to variable selection. However, the forward selection produced an almost nonsensical result for radiologic aspiration (OR of almost 0 with an associated P = .995). Moreover, the VIF values from this model ranged upwards of 3.4. Although a value of 3.4 for VIF is not a concerning value for multicollinearity, when compared to smaller VIF values in our model, we feel even more confident in our choice of purposeful selection for this particular study.

DISCUSSION

Overall, most patients (82%) with SSIs were successfully treated with medical management. This study successfully identified risk factors found among the cohort of patients who failed medical management and required surgical intervention. The most significant risk factor identified was presenting for surgery because of the revision of a prior procedure. Patients with diabetes and women also had a higher risk of requiring surgical management to resolve infections. Additionally, the most common organism cultured from the infected wounds was methicillin-sensitive S aureus, and the average time from the index surgery to diagnosis of infection was 20 days.

Although there are a multitude of factors associated with an increased risk of SSIs, the literature is scarce with regard to which patients may fail medical management following the development of an infection. Our study found that patients undergoing revision surgery were most at risk of failure. This corresponds to previous findings that suggest revision surgery is a strong risk factor for developing an SSI following a lumbar procedure.18,19 Smoking and diabetes have also been previously identified as risk factors. This study, however, is the first to predict failure of medical management based on these variables.

Additionally, our study identified the use of VACs to be associated with failure of medical management. Although I&D is considered the standard of therapy for SSIs, VACs have been used for postoperative spine infection. These have proven to be an effective add-on therapy following I&D to assist with wound closure.20 Although VACs have decreased wound complications, improved healing times, and reduced overall morbidity rates, their use may be a predictive factor for further surgical management.21 Patients who require a VAC for wound closure should be carefully monitored because they may be at a greater risk for the need for additional surgical intervention. Furthermore, other studies have demonstrated that the institution of prompt antibiotic therapy coupled with the use of VACs in patients with identified risk factors for developing an SSI may reduce the duration of treatment, eliminate the need for I&D, decrease the length of hospital stay, and reduce health care expenses.20 Our findings support these claims and distinguish the use of VACs as a risk factor for failed medical management.

It is important for the clinician to understand the importance of early recognition and prompt administration of antibiotics as well as how to recognize patients who may require multiple I&Ds or more complex management. Previously, Dipaola et al.22 described the PITTS score to determine what patient factors predict the need for complicated SSI management following spine surgery. The most significant findings were patients with methicillin-resistant Staphylococcus aureus cultures and those with distant site infections or bacteremia. Other predictors include instrumentation, surgery to the posterior lumbar spine, use of nonautograft bone graft material, and diabetes. Recently, Lee et al.23 developed an algorithm that uses preoperative risk factors to predict the development of an SSI following spine surgery. It provides an absolute percent likelihood of an SSI, which can be used in patient consultations. We suggest that use of the PITTS score and Lee algorithm to help clinicians determine which patients are at increased risk of developing an SSI following spine surgery as medical management is more successful if early diagnosis is made.24 We recommend early administration of antibiotics if there is a strong suspicion of infection. Failure to eliminate SSIs has been associated with a significantly greater morbidity, mortality, and health care expenditure.10–13 The authors suggest that patients with risk factors such as older age, female sex, diabetes, and smoking may need closer follow-up because they are at risk of failure of medical management, which can result in increased health care expenditure.

A weakness of this study is the relatively small sample size of infected patients (n = 74) and those requiring additional surgical management (n = 13). This is likely due to the use of a small private practice rather than a large institution. The practice setting (a community infectious disease practice) also likely increased the rate of follow-up. Furthermore, although precise clinical management of SSIs varies with clinician, it should be noted that our protocol does differ from some examples in the literature. Many studies included the use of I&D as part of their initial treatment regimen, which differs from our protocol.10,14 This protocol was established in order to minimize additional procedures.

CONCLUSION

In conclusion, our study identified several risk factors for the failure of medical management following the development of an SSI in patients undergoing lumbar surgical procedures. The most important factors include revision surgery, diabetes, and female sex. These patients warrant additional monitoring and are more likely to require surgical treatment. To the author's knowledge this is the first study to identify risk factors associated with an increased likelihood of failure of medical management of an SSI following lumbar surgery. Additional studies with larger sample sizes should be conducted in order to confirm findings.

Footnotes

  • Disclosures and COI: The authors received no funding for this study and report no conflicts of interest.

  • ©International Society for the Advancement of Spine Surgery
  • Copyright © 2019 ISASS - This manuscript is generously published free of charge by ISASS, the International Society for the Advancement of Spine Surgery

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What Factors Predict Failure of Nonsurgical Management of a Lumbar Surgical Site Infection?
CHRISTOPHER J. LUCASTI, MYLES DWORKIN, KRIS E. RADCLIFF, KRISTEN NICHOLSON, CHRISTOPHER J. LUCASTI, BARRETT I. WOODS
International Journal of Spine Surgery Jun 2019, 13 (3) 239-244; DOI: 10.14444/6032

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What Factors Predict Failure of Nonsurgical Management of a Lumbar Surgical Site Infection?
CHRISTOPHER J. LUCASTI, MYLES DWORKIN, KRIS E. RADCLIFF, KRISTEN NICHOLSON, CHRISTOPHER J. LUCASTI, BARRETT I. WOODS
International Journal of Spine Surgery Jun 2019, 13 (3) 239-244; DOI: 10.14444/6032
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