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J Thorac Cardiovasc Surg 2002;123:895-900
© 2002 The American Association for Thoracic Surgery

Surgery for Acquired Cardiovascular Disease (ACD)

Vacuum-assisted closure therapy guided by C-reactive protein level in patients with deep sternal wound infection

From the Departments of Cardiothoracic Surgery^a and Anesthesiology,^b Heart and Lung Division, University Hospital, Lund, Sweden.

Received for publication July 6, 2001. Revisions requested Aug 1, 2001; revisions received Aug 17, 2001. Accepted for publication Sept 25, 2001. Address for reprints: Ronny Gustafsson, MD, Heart and Lung Division, University Hospital, SE-221 85 Lund, Sweden (E-mail: ronny.gustafsson{at}thorax.lu.se).

	Abstract

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Background: Deep sternal wound infection is a serious and potentially lethal complication of cardiac surgery when performed through a median sternotomy. We describe the outcome of a new treatment strategy with C-reactive protein level-guided vacuum-assisted closure used at our department.
Methods: Data from 16 consecutive adult patients who had deep sternal wound infections after cardiac surgery were reviewed. Patients with superficial infection or sterile dehiscence were not included. All patients with postoperative deep sternal wound infections were treated with first-line vacuum-assisted closure therapy, followed by direct surgical closure. A purpose-built vacuum-assisted closure system consisting of polyurethane foam pieces and a special pump unit was used. The foam was placed in the wound after debridement of foreign material and necrotic tissue. The wound was covered with adhesive drape and connected to the pump unit, which was programmed to create a continuous negative pressure of 125 mm Hg in the wound cavity. Intravenous antibiotics were given according to tissue-culture results. The patients were immediately extubated after the operation. When ingrowth of granulation tissue was observed in all parts of the wound and the plasma C-reactive protein level showed a steady decline to 30 to 70 mg/L or less without confounding factors, such as tissue injuries or concomitant infections, the sternotomy was rewired, and the wound was closed.
Results: All patients were alive and free from deep sternal wound infection 3 months after the operation. The median vacuum-assisted closure treatment time until surgical closure was 9 days (range, 3-34 days), and the median C-reactive protein level at closure was 45 mg/L (range, 20-173 mg/L). The median hospital stay was 22 days (range, 12-120 days).
Conclusions: Early vacuum-assisted closure treatment, followed by surgical closure guided by the plasma C-reactive protein level, is a reliable and easily applied new strategy in patients with postoperative deep sternal wound infection.

	Introduction

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Deep sternal wound infection is a serious complication of cardiac surgery with both human and economic consequences. ^1,2 The reported incidence varies from 1% to 5% of all sternotomy procedures. ^3,4 Mortality has been reported to range between 0% and 35% in different studies. ^5-7 The established treatment at most centers involves surgical debridement, drainage, irrigation, and delayed closure with reconstruction with omentum or a pectoral muscle flap. ^7,8 Despite numerous advances in different reconstructive surgical techniques, the infected and frequently dehisced poststernotomy wound continues to be a treatment challenge, and optimal management is still a matter of controversy. The overall aim is to find a safe, standardized, and less invasive method to heal these wounds completely by first intention.

In this article we present a new method for postoperative deep sternal wound infection: a combination of vacuum-assisted closure with secondary surgical closure of the sternotomy at a time point guided by daily measurements of the systemic plasma concentration of C-reactive protein. The vacuum-assisted closure treatment will increase the elimination rate of bacteria present in the wound, ⁹ and this might decrease the amount of inflammatory cytokines released, which, as a result, will affect the initiation of the acute-phase reaction with a concomitant decline in systemic plasma C-reactive protein levels. With this new strategy, several aspects of infected wound treatment are combined: objective monitoring, removal of all foreign material, adequate drainage, accelerated granulation, complete coverage, and obliteration of the wound cavity.

	Methods

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The most common signs leading to diagnosis were an unstable sternum with secretion, fever, leukocytosis, and high plasma C-reactive protein levels. Debridement of clearly necrotic and infected bone tissue was performed at the time of the vacuum-assisted closure application. This was carried out in a conservative and bone-saving manner. At the same time, 5 mediastinal tissue cultures were obtained from the wound (Table 1). Antibiotic treatment was started with intravenous vancomycin in all patients. The doses were adjusted according to the renal status of the patients. This treatment continued until the tissue cultures arrived. The regimen was changed according to sensitivity (Table 1). No vancomycin-resistant bacteria were found. The intravenous therapy continued for 7 days after sternal closure. The oral regimen continued for 4 weeks as a combined therapy, according to the sensitivity of the strains.

The polyurethane foam dressing was changed twice a week under aseptic conditions. This was done after achievement of full anesthesia. At the time of dressing change, avascular and necrotic bone tissue was demarked with the vacuum-assisted closure therapy by lack of granulation tissue and can easily be removed. Most of the patients were extubated immediately after vacuum-assisted closure application and could leave the intensive care unit after 2 to 3 hours. When visual inspection showed the wound to be well vascularized and covered with granulation tissue and the C-reactive protein level had declined to 30 to 70 mg/L without confounding factors, such as the presence of tissue injuries or infection elsewhere, the wound was considered to be free from infection. The sternotomy was rewired without further debridement with interrupted steel wire (Stahldraht; Johnson and Johnsson, Brussels, Belgium), and the skin was closed with interrupted stitches (Dermalon 2-0; Davis and Geck, St Louis, Mo).

	Results

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Between February 1999 and December 2000, 16 consecutive patients with postoperative deep sternal wound infection after cardiac surgery were identified and treated with first-line vacuum-assisted closure therapy. During this time interval, a total of 2201 patients were operated on through a median sternotomy in our institution, giving an incidence of deep sternal wound infection of approximately 0.7%. Thirteen (81%) patients were men, and 3 (19%) were women. The median age of the male patients was 68 years (range, 49-82 years), and that for the female patients was 67 years (range, 63-73 years).

The median time between the initial cardiac operation and the diagnosis of deep sternal wound infection was 16 days (range, 3-52 days). The median duration of vacuum-assisted closure treatment was 9 days (range, 4-34 days), and the median hospital stay was 22 days (range, 12-120 days). Nine of the 16 patients were able to leave the intensive care unit after 2 to 3 hours of observation (Table 1). The median systemic plasma C-reactive protein level showed a progressive decline during treatment and was 45 mg/L (range, 20-173 mg/L) at surgical closure of the sternotomy (Figure 1, A).

View larger version (22K): [in this window] [in a new window]   Fig. 1. A, Median C-reactive protein levels are presented in a box plot 6 days before and 6 days after sternal closure. The whiskers represent the range of the data, the boxes express the upper and lower quartiles, and the central line shows the median. Diamonds, Outliers. B, Median white blood cell count levels are presented in a box plot 6 days before and 6 days after sternal closure. The whiskers represent the range of the data, the boxes express the upper and lower quartiles, and the central line shows the median. Diamonds, Outliers.

	Discussion

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Sealed negative-pressure treatment was first described in the early 1990s as a method to accelerate wound healing in patients with open fractures ¹⁰ and resulted in the development of a vacuum-assisted closure system. ^11,12 Negative-pressure treatment of wounds has been used with success in reconstructive and trauma surgery. ^13,14 A particular benefit of applying vacuum into the wound is to promote healing in complicated cases in which established treatment fails. ¹⁵ Tang and coworkers ¹⁶ successfully treated 15 patients with sternotomy wound infections with vacuum-assisted closure for 22 to 69 days without surgical closure. We consider this a safe method, and the risk of reinfection is low. It was time consuming, and the sternum was not rewired, but this strategy would still be an option in patients who are otherwise obsolete surgical candidates.

Because of our former experience with patients in whom deep sternal wound infection has been treated with major reconstructive surgery, which causes extensive hospitalization and patient morbidity, we developed a new strategy using vacuum-assisted closure for patients with deep sternal wound infection. Serial measurements of systemic C-reactive protein were performed during vacuum-assisted closure and revealed a typical pattern (Figure 1, A). We used this to guide us during the treatment, and closure of the sternum was performed when the plasma levels were progressively declining to 30 to 70 mg/L. At this level, the wound was considered ready for closure. After secondary closure, the C-reactive protein level again rose and reached a peak within 72 hours before declining to preclosure levels. This elevation corresponded to the surgical trauma ¹⁷ and was not a sign of reinfection.

The white blood cell count was helpful for the diagnosis of deep sternal wound infection but did not show a trend useful for guide lining of sternal closure and monitoring of the vacuum-assisted closure therapy (Figure 1, B). We therefore suggest the monitoring of plasma C-reactive protein (Figure 1, A) to be an adjunct for wound control ^18,19 and for assessing the appropriate time for sternal closure during high negative-pressure therapy.

In 3 patients (patients 2, 8, and 15) the sternotomy was rewired despite a markedly persistent elevation in their C-reactive protein values (Figure 2). In these patients the sternal wound was not the source of infection. Two patients (patients 2 and 8) were treated for 32 and 34 days, respectively. Patient 2 had a stroke, multiorgan failure, and bilateral pneumonia. Patient 8 had peritonitis and was treated for bowel obstruction caused by chronic peritoneal dialysis. In these 2 patients the C-reactive protein level remained high because of concomitant infection, and they stayed in the hospital for other reasons than sternal infection. Patient 15 had massive pectoral muscle necrosis caused by cardiac resuscitation, followed by an emergency valve operation. The sternum was rewired, and the muscle necrosis was partially resected and separately drained. These 3 patients were moribund as the vacuum-assisted closure therapy was initiated. They recovered but required longer hospitalization because of the complexity of their diseases (Table 1). In cases in which the C-reactive protein level remains high as a result of confounding factors, sternal tissue cultures are required to decide when to close the sternotomy.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Individual C-reactive protein level at the time of sternal wound closure.

View larger version (210K): [in this window] [in a new window]   Fig. 3. Day 1 after sternal revision and vacuum-assisted closure application. The patient is mobilized in the ward.

Most of the patients had positive cultures with vancomycin- or clindamycin-sensitive coagulase-negative staphylococci (Table 1), which is a growing problem among postoperative cardiac patients. ^2,20 Therefore another advantage of this closed and controlled system is a decreased risk of contamination to the environment.

Hemodynamic instability, bleeding tendency, arrhythmia, and chest pain were considered potential problems. However, none of our patients experienced any of these. Some air leakage was noticed but could easily be handled with additional adhesive drape.

Animal studies by Morykwas and coworkers ⁹ showed that vacuum-assisted closure accelerated the elimination of edema and bacteria in the wound. Additionally, an increase in blood flow by 3 to 4 times and an accelerated ingrowth of granulation tissue by 2 to 3 times was noted. All these features will increase the wound vascularity, which is of utmost importance for early secondary closure and optimal wound healing in a patient with deep sternal wound infection.

The results presented in this article describe a new strategy for treatment of deep sternal wound infection, with possible positive effects on morbidity and cost-effectiveness. More studies are needed for proper comparison with the standard treatment of early sternectomy and muscle flap closure.

	References

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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Personal Folders Download to citation manager Author home page(s): Ronny Gustafsson Per Johnsson Richard Ingemansson Permission Requests Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Gustafsson, R. Articles by Ingemansson, R. Search for Related Content PubMed PubMed Citation Articles by Gustafsson, R. Articles by Ingemansson, R. Related Collections Mediastinum Chest wall