Omental pedicle grafting in the treatment of postcardiotomy sternotomy infection

Sternal reconstruction after post-sternotomy mediastinitis

Background

Deep sternal wound complications are uncommon after cardiac surgery. They comprise sternal dehiscence, deep sternal wound infections and mediastinitis, which will be treated as varying expressions of a singular pathology for reasons explained in the text.

Methodology and review

This article reviews the definition, prevalence, risk factors, prevention, diagnosis, microbiology and management of deep sternal wound infections and mediastinitis after cardiac surgery. The role of negative pressure wound therapy and initial and delayed surgical management is discussed with special emphasis on plastic techniques with muscle and omental flaps. Recent advances in reconstructive surgery are presented.

Conclusions

Deep sternal wound complications no longer spell debilitating morbidity and high mortality. Better understanding of risk factors that predispose to deep sternal wound complications and general improvement in theatre protocols for asepsis have dramatically reduced the incidence of deep sternal wound complications. Negative pressure wound therapy and appropriately timed and staged muscle or omental flap reconstruction have transformed the outcomes once these complications occur.

Important considerations in chest wall reconstruction

Chest wall reconstruction represents one of the most challenging tasks in plastic surgery. Over the past several decades, a more profound understanding of surgical anatomy and physiology along with tremendous advances in surgical technique have resulted in substantial improvements in postoperative outcomes. Conceptually, the reconstructive goals include dead space obliteration, restoration of skeletal stability with protection of intrathoracic structures, and stable soft tissue coverage. Ideally, these goals are achieved with minimal aesthetic deformity. J. Surg. Oncol. 2016;113:913-922. © 2016 Wiley Periodicals, Inc.

Management of sternal wounds by limited debridement and partial bilateral pectoralis major myocutaneous advancement flaps in 25 patients: a less invasive approach

PURPOSE

Because sternal wound complications after sternotomy can be life threatening and often occur in very sick patients, optimal management of these complications remains an important topic. To decrease postoperative morbidity and shorten the recovery period, the senior author (J.A.A.) sought a less invasive approach to sternal debridement and flap closure in carefully selected patients. The purpose of this study was to evaluate the effectiveness of this approach by obtaining specific outcomes data from a series of patients treated with this less invasive method.

MATERIALS AND METHODS

Of the most recent 174 sternal wounds treated by the senior author, 25 underwent limited debridement and partial bilateral pectoralis major advancement flaps. The charts of these 25 patients were reviewed and analyzed.

RESULTS

In the 25 patients who underwent limited debridement, there were no mortalities intraoperatively or during the 30-day postoperative period. Six patients (24%) experienced complications after debridement, including 1 recurrent sternal wound infection, 1 partial wound dehiscence, 1 seroma, 1 hematoma, and 1 wound edge necrosis requiring revision. Mean length of hospitalization after the procedure was 10 days, compared with 30 days (P = 0.0001) as previously reported with full debridement (Plast Reconstr Surg 2004; 114:676). Mean estimated intraoperative blood loss was reduced from 331 mL during full debridement to 93 mL (P < 0.0001) with limited debridement (Plast Reconstr Surg 2004; 114:676). There was no increase in postoperative morbidity (24 % vs 13 %, P = 0.2117).

CONCLUSIONS

The authors advocate limited sternal debridement and partial bilateral pectoralis major myocutaneous advancement flaps in patients with limited wounds and partially or fully healed sternums. We demonstrate that the procedure is effective but less invasive than complete debridement, reduces operative time and blood loss, and shortens length of hospitalization.

Secondary omental and pectoralis major double flap reconstruction following aggressive sternectomy for deep sternal wound infections after cardiac surgery

Background

Deep sternal wound infection after cardiac surgery carries high morbidity and mortality. Our strategy for deep sternal wound infection is aggressive strenal debridement followed by vacuum-assisted closure (VAC) therapy and omental-muscle flap reconstrucion. We describe this strategy and examine the outcome and long-term quality of life (QOL) it achieves.

Methods

We retrospectively examined 16 patients treated for deep sternal wound infection between 2001 and 2007. The most recent nine patients were treated with total sternal resection followed by VAC therapy and secondary closure with omental-muscle flap reconstruction (recent group); whereas the former seven patients were treated with sternal preservation if possible, without VAC therapy, and four of these patients underwent primary closure (former group). We assessed long-term quality of life after DSWI by using the Short Form 36-Item Health Survey, Version 2 (SF36v2).

Results

One patient died and four required further surgery for recurrence of deep sternal wound infection in the former group. The duration of treatment for deep sternal wound infection in the recent group was significantly shorter than that in previous group (63.4 ± 54.1 days vs. 120.0 ± 31.8 days, respectively; p = 0.039). Despite aggressive sternal resection, the QOL of patients treated for DSWI was only minimally compromised compared with age-, sex-, surgical procedures-matched patients without deep sternal wound infection.

Conclusions

Aggressive sternal debridement followed by VAC therapy and secondary closure with an omental-muscle flap is effective for deep sternal wound infection. In this series, it resulted in a lower incidence of recurrent infection, shorter hospitalization, and it did not compromise long-term QOL greatly.

Laparoscopic Harvest of an Omental Flap to Reconstruct an Infected Sternotomy Wound

Sternotomy dehiscence is associated with a high mortality rate. In most cases this complication may be treated by simple debridement and antibiotic therapy, but sometimes it is necessary to fill the sternal defect with viable tissue. The greater omentum seems to be the ideal tissue to be transposed because of its malleability, good vascularization, and high lymphatic tissue content. The transposition of the greater omentum usually requires a midline laparotomy for the preparation of the flap, with significant laparotomy-related morbidity. Laparoscopic access may represent an effective alternative for preparing and transposing the omental flap. The key points of the laparoscopic technique are (1) the coloepiploic detachment, (2) the section of the anastomotic arterial branches between the Barkow's arcade and the gastroepiploic arcade, (3) the mobilization of the greater omentum pedicled on the right gastroepiploic artery, and (4) its transposition into the mediastinum, taking care to avoid twisting the gastric greater curvature and the flap itself.

The neurochemical basis for the applications of the greater omentum in neurosurgery

The omentum has been utilized in neurosurgery for over 30 years. However, the anatomical and physiological bases for its applications have not been described in great detail. In this paper, we will review the current status of the omentum applications for the management of central nervous system disorders.

Single-stage treatment of sternal wound complications in heart transplant recipients in whom pectoralis major myocutaneous advancement flaps were used

Treatment of sternal wound complications is controversial, particularly in immunosuppressed heart transplant recipients. Regardless of the severity of infection, we combine immediate, aggressive débridement with bilateral pectoralis major myocutaneous advancement flaps in a single procedure. Compared with management with pectoralis major turnover flaps or distant pedicled muscle flaps, treatment of these sternal wounds with pectoralis major myocutaneous advancement flaps is simpler and quicker and provides better aesthetic results. Furthermore, because pectoralis major myocutaneous flaps are based on the thoracoacromial arteries, whether or not the internal mammary arteries have previously been harvested for coronary grafts is irrelevant. Twenty consecutive heart transplant recipients with sternal wound complications were treated with this technique. No intraoperative or perioperative deaths occurred. The morbidity rate was 30%, with seroma treated by needle aspiration in four patients (20%) being the most common complication. Only one patient had a postoperative wound infection. All patients had excellent functional and aesthetic results.

Omental transfer for the treatment of mediastinitis in an infant

Mediastinitis following congenital heart surgery is relatively uncommon but is usually seen in the setting of postoperative low cardiac output. Conservative treatment utilizing debridement and irrigation is associated with significant morbidity and mortality. We report the successful application of the omental transfer technique in the treatment of mediastinitis in a 6 month old.

The risk factors of median sternotomy infection: a current review

Sternal sepsis following median sternotomy is an infrequent yet devastating complication of cardiac surgery, leading to prolonged hospitalization, increased hospital expense, and a high associated morbidity and mortality. The development of sternotomy infection is multifactorial. Numerous prospective and retrospective studies have pointed to a multitude of clinical and perioperative variables as being causative, with as many other studies presenting evidence of the contrary. This has led to confusion about which clinical variables should be modified so as to minimize the individual patient's risk for developing this severe complication. Other less obvious factors also come into play. Malnutrition, whether overt or subclinical, is not uncommon in cardiac patients. Immune competency is affected by operative trauma, as well as a variety of perioperative factors including underlying nutritional status, transfusion, cardiopulmonary bypass, and anesthesia. This creates a complex milieu for the development of postoperative infection. In this review, the multiple risk factors of median sternotomy infection are studied and treatment options briefly discussed.

Sternotomy after muscle flap repair of sternal osteomyelitis and mediastinitis

A 61-year-old man who had undergone aortocoronary bypass developed sternal osteomyelitis and mediastinitis which required sternal debridement and muscle flap interposition. Two years later the midline incision was used for an orthotopic heart transplantation. No major technical difficulties were encountered at the time of transplantation.