Primary sternal plating in high-risk patients prevents mediastinitis

Thoracic Wall Reconstruction after Tumor Resection

Introduction

Surgical treatment of malignant thoracic wall tumors represents a formidable challenge. In particular, locally advanced tumors that have already infiltrated critical anatomic structures are associated with a high surgical morbidity and can result in full-thickness defects of the thoracic wall. Plastic surgery can reduce this surgical morbidity by reconstructing the thoracic wall through various tissue transfer techniques. Sufficient soft-tissue reconstruction of the thoracic wall improves quality of life and mitigates functional impairment after extensive resection. The aim of this article is to illustrate the various plastic surgery treatment options in the multimodal therapy of patients with malignant thoracic wall tumors.

Materials and methods

This article is based on a review of the current literature and the evaluation of a patient database.

Results

Several plastic surgical treatment options can be implemented in the curative and palliative therapy of patients with malignant solid tumors of the chest wall. Large soft-tissue defects after tumor resection can be covered by local, pedicled, or free flaps. In cases of large full-thickness defects, flaps can be combined with polypropylene mesh to improve chest wall stability and to maintain pulmonary function. The success of modern medicine has resulted in an increasing number of patients with prolonged survival suffering from locally advanced tumors that can be painful, malodorous, or prone to bleeding. Resection of these tumors followed by thoracic wall reconstruction with viable tissue can substantially enhance the quality of life of these patients.

Discussion

In curative treatment regimens, chest wall reconstruction enables complete resection of locally advanced tumors and subsequent adjuvant radiotherapy. In palliative disease treatment, plastic surgical techniques of thoracic wall reconstruction provide palliation of tumor-associated morbidity and can therefore improve patients’ quality of life.

Therapeutic Outcomes of Pectoralis Major Muscle Turnover Flap in Mediastinitis

Background

This study aimed to evaluate the therapeutic results and safety of pectoralis major muscle turnover flaps in the treatment of mediastinitis after coronary artery bypass grafting (CABG) procedures.

Methods

Data regarding 33 patients with post-CABG deep sternal wound infections (DSWIs) who underwent pectoralis major muscle turnover flap procedures in the Emam Reza and Ghaem Hospitals of Mashhad, Iran were reviewed in this study. For each patient, age, sex, hospital stay duration, remission, recurrence, and associated morbidity and mortality were evaluated.

Results

Of the 2,447 CABG procedures that were carried out during the time period encompassed by our study, DSWIs occurred in 61 patients (2.5%). Of these 61 patients, 33 patients (nine females [27.3%] and 24 males [72.7%]) with an average age of 63±4.54 years underwent pectoralis major muscle turnover flap placement. Symptoms of infection mainly occurred within the first 10 days after surgery (mean, 10.24±13.62 days). The most common risk factor for DSWIs was obesity (n=16, 48.4%) followed by diabetes mellitus (n=13, 39.4%). Bilateral and unilateral pectoralis major muscle turnover flaps were performed in 20 patients (60.6%) and 13 patients (39.4%), respectively. Complete remission was achieved in 25 patients (75.7%), with no recurrence in the follow-up period. Four patients (12.1%) needed reoperation. The mean hospitalization time was 11.69±6.516 days. Four patients (12.1%) died during the course of the study: three due to the postoperative complication of respiratory failure and one due to pulmonary thromboembolism.

Conclusion

Pectoralis major muscle turnover flaps are an optimal technique in the treatment of post-CABG mediastinitis. In addition to leading to favorable therapeutic results, this flap is associated with minimal morbidity and mortality, as well as a short hospitalization time.

Effect of sternal closure with biological bone adhesive on pain visual analogue score and serum cytokine

Objectives

Recently a biocompatible bone adhesive was introduced in addition to the sternal wires to expedite sternal union and improve patient recovery. In this study we aim to objectively assess the biomarker of pain in patient who received the biocompatible bone adhesive.

Methods

A total of 62 patients who underwent sternotomy were prospectively randomised to receive either conventional wire closure (CWC); 32 patients or adhesive enhanced closure in addition to sternal wire (AEC); 30 patients. Patients were monitored postoperatively at certain time intervals for incisional pain, serum Interleukin-6 (IL-6) level, analgesia used and postoperative complications. All patients were followed up for 4 weeks.

Results

The post-operative pain scores with coughing were significantly higher in the CWC group at 24 hours and 48 hours. The postoperative IL 6 levels were significantly higher in the CWC group in comparison with the AEC group at 6 hours, 24 hours, and 48 hours. There were no significant differences in term of additional analgesia used. No adverse events from adhesive bone cement were observed during follow up.

Conclusions

Adhesive-enhanced sternal closure resulted in modest reduction of pain confirmed by reduction of pain biomarker. Justification of its routine use requires larger multicentre study.

Absorbable sternal pins improve sternal closure stability within a small deviation

OBJECTIVE

Sternum external fixation with a sternal wire is widely used. However, it was inadequate fixation in the anterior-posterior and cranial-caudal directions. Using sternal pins can improve the stability. The utility of a small deviation was important with respect to sternal pain. Here, we evaluated the efficacy of a sternal pin in a small deviation in three directions.

METHODS

Polyurethane foam was used. In the wire group, models were closed using two stainless steel wires. In the wire and sternal pin group, a hydroxyapatite/poly-L-lactide acid (HA/PLLA) sternal pin was used for internal fixation in addition to wire fixation. A sternal pin was inserted inside. Both sides were fixed with the testing machine and the shear stress was directed to one side. In each group, six models were tested for three directions. The relationship between the load and displacement of the model was measured at 1-mm displacement.

RESULTS

In the anterior-posterior direction, the load value was 138.8 ± 8.3 (N) in the wire and sternal pin group and 51.6 ± 9.5 (N) in the wire group (p = 0.0003). In the cranial-caudal direction, the values were 148.0 ± 12.0 (N) and 83.1 ± 26.6 (N), respectively (p < 0.0001). In the lateral direction, these values were 273.2 ± 49.3 (N) and 266.9 ± 50.6 (N), respectively (p = 0.8323).

CONCLUSIONS

Additional internal fixation using an HA/PLLA sternal pin significantly improved the stability of sternotomy closure in the anterior-posterior and cranial-caudal directions within a small deviation.

Mortality trends and the effects of débridement timing in the management of mediastinitis in the United States, 1998 to 2010

BACKGROUND

The authors examined the relationship between débridement delay and mortality for mediastinitis patients. The authors also assessed mortality trends for mediastinitis patients between 1998 and 2010.

METHODS

The authors conducted a retrospective cross-sectional study with data from the Nationwide Inpatient Sample, 1998 to 2010. They studied adult patients, 18 years of age or older, who were surgically treated for mediastinitis. They used a logistic regression model adjusted for patient demographic and clinical characteristics to evaluate the association between timing of first operative débridement and in-hospital mortality. Using their logistic model, they calculated the adjusted probability of in-hospital mortality for each year of the study.

RESULTS

Results showed that initial débridement after the fourth day of admission increased the odds of in-hospital mortality by 50 percent (odds ratio, 1.5; 95 percent confidence interval, 1.0 to 2.1). In addition, the adjusted probability of in-hospital mortality for an average patient treated for mediastinitis decreased from 10.6 percent in 1998 to 3.1 percent in 2010.

CONCLUSION

There is a survival advantage from timely initial débridement in mediastinitis patients.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Risk, II.

The arrowhead ministernotomy with rigid sternal plate fixation: a minimally invasive approach for surgery of the ascending aorta and aortic root

Background. Ministernotomy incisions have been increasingly used in a variety of settings. We describe a novel approach to ministernotomy using arrowhead incision and rigid sternal fixation with a standard sternal plating system. Methods. A small, midline, vertical incision is made from the midportion of the manubrium to a point just above the 4th intercostal mark. The sternum is opened in the shape of an inverted T using two oblique horizontal incisions from the midline to the sternal edges. At the time of chest closure, the three bony segments are aligned and approximated, and titanium plates (Sternalock, Jacksonville, Florida) are used to fix the body of the sternum back together. Results. This case series includes 11 patients who underwent arrowhead ministernotomy with rigid sternal plate fixation for aortic surgery. The procedures performed were axillary cannulation (n = 2), aortic root replacement (n = 3), valve sparing root replacement (n = 3), and replacement of the ascending aorta (n = 11) and/or hemiarch (n = 2). Thirty-day mortality was 0%; there were no conversions, strokes, or sternal wound infections. Conclusions. Arrowhead ministernotomy with rigid sternal plate fixation is an adequate minimally invasive approach for surgery of the ascending aorta and aortic root.

Multidimensional sternal fixation to overcome a "floating" sternum

This case report describes the repair of a complete sternal dehiscence of the lower right sternum using sternal wires, manubrial plates, and a Talon closure device for rigid, multidimensional sternal fixation. Sternal dehiscence is a rare but significant cause of morbidity for patients undergoing median sternotomy. The risk factors for this complication are well described and although sternal wires have traditionally been used for primary closure, rigid fixation with sternal plates is a viable alternative to avoid dehiscence in this high-risk cohort.

Sternal talon offers a solution for secondary sternum osteosynthesis in patients with nonunion

BACKGROUND

Median sternotomy may be associated with postoperative complications such as nonunion after conventional metal wire closure. The Sternal Talon device (KLS Martin, Jacksonville, FL) has recently been introduced as an alternative for osteosynthesis after median sternotomy and may also be beneficial for patients with persistent sternal nonunion.

METHODS

A consecutive series of 24 patients underwent Sternal Talon repair for sternal nonunion or acute mediastinitis, or both, after sternal wire closure. Patient data--including demographics, surgical history, and indication for operation, as well as outcomes--were obtained and analyzed by retrospective chart review.

RESULTS

The average patient age was 61.3 years and 23 patients were men (95.8%). The most common median sternotomy procedure was coronary artery bypass grafting (CABG) in 19 patients (79.2%). Secondary closure using the Sternal Talon was indicated for sternal nonunion or infection, or both, in all patients. Eight patients underwent simultaneous muscle flap procedures during the placement of the Sternal Talon (33.3%). Sternal union was eventually achieved in 23 of 24 patients (95.8%). Subsequent reoperation was required in 4 patients (16.7%).

CONCLUSIONS

The data presented suggest that the osteosynthesis using the Sternal Talon device is a safe and effective modality for treating symptomatic sternal nonunion or acute dehiscence associated with infection (mediastinitis.).

Implantable device to monitor cardiac activity with sternal wires

BACKGROUND

Sternal wires are used to close the thoracic cavity and facilitate healing after median sternotomy (MS). We invented an implantable device that uses these wires as sensors to monitor cardiac electrical activity and tested its utility in collecting electrocardiography (ECG) data in vivo.

METHODS

The wafer-thin silicone device has grooves with embedded metal contacts that secure the sternal wires and connect them to an ECG sensor. We used radiofrequency telemetry to communicate with the implanted device, which was evaluated in three acute swine studies and one chronic-survival swine study. The device was implanted via MS in two acute studies and left thoracotomy in the other. In two acute studies, ECG data were collected with the pigs in four different positions for 2 minutes each; in the third study, we induced ischemia and collected ECG data. For the chronic study, we implanted the device via a left thoracotomy and obtained ECG data weekly until euthanasia on day 27. After each study, the sternum and device were removed and examined.

RESULTS

The ECG tracings showed distinct P, QRS, and T waveforms with minimal positional or temporal variability. Our device captured signal changes during ischemia before the external control did. In the chronic study, necropsy showed appropriate healing, fibrous encapsulation, and no infection or adverse reactions.

CONCLUSIONS

These initial results showed that our novel device can use sternal wires as electrodes in vivo to monitor cardiac electrical activity and safely capture physiologic signals after surgical placement.

Risk factors for mediastinitis following cardiac surgery: the importance of managing obesity

BACKGROUND

Mediastinitis is a devastating complication of cardiac surgery. Previous studies have often observed small populations, been retrospective in design, and used a variety of definitions for mediastinitis.

AIM

To identify risk factors for mediastinitis, and strategies to minimize its incidence.

METHODS

A prospective cohort study of 4883 adult patients who underwent cardiac surgery between October 2003 and February 2009, comparing pre- and peri-operative risk factors, microbial aetiology, requirement for re-admission, length of stay and mortality between patients with and without mediastinitis.

FINDINGS

Ninety (1.8%) patients were diagnosed with mediastinitis. Microbial aetiology was defined for 75 patients. Staphlyocococcus aureus was the most common isolate (30 episodes; 15 due to meticillin-resistant S. aureus). Univariate analysis revealed the following pre-operative factors associated with mediastinitis: age; body mass index; diabetes; modified logistic European System for Cardiac Operative Risk Evaluation score; urgent admission; and longer pre-operative stay (P < 0.05). Associated peri-operative factors were: combined coronary artery bypass grafting plus aortic valve replacement; longer aortic cross-clamp time; and longer cardiopulmonary bypass time (P < 0.005). Multi-variate analysis revealed that higher body mass index, combined coronary artery bypass grafting plus aortic valve replacement, and older age were associated with mediastinitis (P < 0.05). Mediastinitis was associated with re-admission to hospital, longer inpatient stay and reduced long-term survival (P < 0.05).

CONCLUSION

Mediastinitis is associated with worse short-term outcomes (re-admission, length of stay) and reduced long-term survival. Obesity is the only modifiable pre-operative risk factor for mediastinitis. It may be possible to reduce risk through pre-operative weight loss programmes before elective surgery.

Mechanism of sternotomy dehiscence

OBJECTIVES

Biomechanical modelling of the forces acting on a median sternotomy can explain the mechanism of sternotomy dehiscence, leading to improved closure techniques.

METHODS

Chest wall forces on 40 kPa coughing were measured using a novel finite element analysis (FEA) ellipsoid chest model, based on average measurements of eight adult male thoracic computerized tomography (CT) scans, with Pearson's correlation coefficient used to assess the anatomical accuracy. Another FEA model was constructed representing the barrel chest of chronic obstructive pulmonary disease (COPD) patients. Six, seven and eight trans-sternal and figure-of-eight closures were tested against both FEA models.

RESULTS

Comparison between chest wall measurements from CT data and the normal ellipsoid FEA model showed an accurate fit (P < 0.001, correlation coefficients: coronal r = 0.998, sagittal r = 0.991). Coughing caused rotational moments of 92 Nm, pivoting at the suprasternal notch for the normal FEA model, rising to 118 Nm in the COPD model (t-test, P < 0.001). The threshold for dehiscence was 84 Nm with a six-sternal-wire closure, 107 Nm with seven wires, 127 Nm with eight wires and 71 Nm for three figure-of-eights.

CONCLUSIONS

The normal rib cage closely fits the ellipsoid FEA model. Lateral chest wall forces were significantly higher in the barrel-shaped chest. Rotational moments generated by forces acting on a six-sternal-wire closure at the suprasternal notch were sufficient to cause lateral distraction pivoting at the top of the manubrium. The six-sternal-wire closure may be successfully enhanced by the addition of one or two extra wires at the lower end of the sternotomy, depending on chest wall shape.

Titanium plate fixation for sternal dehiscence in major cardiac surgery

Background

Sternal dehiscence is one of the most troublesome complications following cardiac surgery. Treatment failure and consequent lethal outcomes are very common. The aim of this study was to evaluate titanium plate fixation as a treatment for sternal dehiscence following major cardiac surgery.

Materials and Methods

Between 2010 and 2012, 17 patients underwent sternal reconstruction using horizontal titanium plating for the treatment of post-cardiac-surgery sternal dehiscence. The plates were cut and shaped, and then were fixed to corresponding costal segments using 2-3 titanium screws per each side.

Results

The median age of our patients was 66 years (range, 50 to 78 years) and 9 were female. Indications for sternal reconstruction included aseptic sternal dehiscence in 3 patients and osteomyelitis in 14 patients including 6 patients who were diagnosed with mediastinitis. During the operation, sternal resection and autologous flap interposition were combined in 11 patients. One patient died due to sepsis. Two patients required additional soft tissue wound revisions. Another patient presented with a tuberculous wound infection which was resolved using anti-tuberculosis medications. The postoperative course was uncomplicated in the other 13 patients.

Conclusion

Titanium plate fixation that combines appropriate debridement and flap interposition is very effective for the treatment of sternal dehiscence following major cardiac surgery.

Open reduction internal fixation poststernotomy mediastinitis

Introduction. Mediastinitis has been reported to complicate 5% of sternotomy surgery. We have adopted an open reduction and rigid internal fixation (ORIF) approach during the conventional rescue surgery in the treatment of mediastinitis. Methods. A retrospective review was performed to compare the outcomes of patients that had an ORIF to correct postoperative mediastinitis following median sternotomy. These were compared with the outcome of the patients that did not undergo ORIF. Results. In the 5-year study period, we reviewed 35 mediastinitis patient charts. Postoperatively, the ORIF patient group remained in the Intensive Care Unit (ICU) and on a ventilator for a mean of 1.5 and 0.75 days, respectively. Patients treated without ORIF spent significantly more days in the ICU (mean of 7.5 days, P < 0.05) and on a ventilator (mean of 2.15 days, P = 0.1). Furthermore, it was found that none of the patients (0%) who underwent ORIF complained of any postoperative sternal instability or pain. Preoperatively, however, these rates were as high as 72%. Conclusions. In the select patient, ORIF can be a safe option in the management of mediastinitis, which we have shown to significantly decrease morbidity and mortality by providing anatomic reduction as well as physiologic stabilization. We have shown that ORIF will improve the quality of life of the patient by minimizing abnormal sternal mobility and pain and will also decrease inpatient costs by decreasing days spent in the ICU and ventilator dependence.

Comparison of straight median sternotomy and interlocking sternotomy with respect to biomechanical stability

AIM: To increase the stability of sternotomy and so decrease the complications because of instability.

METHODS: Tests were performed on 20 fresh sheep sterna which were isolated from the sterno-costal joints of the ribs. Median straight and interlocking sternotomies were performed on 10 sterna each, set as groups 1 and 2, respectively. Both sternotomies were performed with an oscillating saw and closed at three points with a No. 5 straight stainless-steel wiring. Fatigue testing was performed in cranio-caudal, anterio-posterior (AP) and lateral directions by a computerized materials-testing machine cycling between loads of 0 to 400 N per 5 s (0.2 Hz). The amount of displacement in AP, lateral and cranio-caudal directions were measured and also the opposing bone surface at the osteotomy areas were calculated at the two halves of sternum.

RESULTS: The mean displacement in cranio-caudal direction was 9.66 ± 3.34 mm for median sternotomy and was 1.26 ± 0.97 mm for interlocking sternotomy, P < 0.001. The mean displacement in AP direction was 9.12 ± 2.74 mm for median sternotomy and was 1.20 ± 0.55 mm for interlocking sternotomy, P < 0.001. The mean displacement in lateral direction was 8.95 ± 3.86 mm for median sternotomy and was 7.24 ± 2.43 mm for interlocking sternotomy, P > 0.001. The mean surface area was 10.40 ± 0.49 cm² for median sternotomy and was 16.8 ± 0.78 cm² for interlocking sternotomy, P < 0.001. The displacement in AP and cranio-caudal directions is less in group 2 and it is statistically significant. Displacement in lateral direction in group 2 is less but it is statistically not significant. Surface area in group 2 is significantly wider than group 1.

CONCLUSION: Our test results demonstrated improved primary stability and wider opposing bone surfaces in interlocking sternotomy compared to median sternotomy. This method may provide better healing and less complication rates in clinical setting, further studies are necessary for its clinical implications.

A review of sternal closure techniques

Sternotomy and sternal closure occur prior to and post cardiac surgery, respectively. Although post-operative complications associated with poor sternal fixation can result in morbidity, mortality, and considerable resource utilization, sternotomy is preferred over other methods such as lateral thoracotomy. Rigid sternal fixation is associated with stability and reduced incidence of post-operative complications. This is a comprehensive review of the literature evaluating in vivo, in vitro, and clinical responses to applying commercial and experimental surgical tools for sternal fixation after median sternotomy. Wiring, interlocking, plate-screw, and cementation techniques have been examined for closure, but none have experienced widespread adoption. Although all techniques have their advantages, serious post-operative complications were associated with the use of wiring and/or plating techniques in high-risk patients. A fraction of studies have analyzed the use of sternal interlocking systems and only a single study analyzed the effect of using kryptonite cement with wires. Plating and interlocking techniques are superior to wiring in terms of stability and reduced rate of post-operative complications; however, further clinical studies and long-term follow-up are required. The ideal sternal closure should ensure stability, reduced rate of post-operative complications, and a short hospitalization period, alongside cost-effectiveness.

Simple adaptations of surgical technique to critically reduce the risk of postoperative sternal complications in patients receiving bilateral internal thoracic arteries

OBJECTIVES

Limited blood supply to the thoracic chest wall is a known risk factor for sternal wound complications after CABG. Therefore, bilateral internal thoracic arteries are still rarely utilized despite their proven superior graft patency. The aim of our study was to analyse whether modification of the surgical technique is able to limit the risk of sternal wound complications in patients receiving bilateral internal thoracic artery grafting.

METHODS

All 418 non-emergent CABG patients receiving bilateral internal thoracic artery CABG procedures (BITA) from January 2001 to January 2012 were analysed for sternal wound complications. Surgical technique together with known risk factors and relevant comorbidity were analysed for their effect on the occurrence of sternal wound complications by means of multivariate logistic regression analysis.

RESULTS

Sternal wound complications occurred in 25 patients (5.9%), with a sternal dehiscence rate of 2.4% (10 patients). In multivariate analysis, diabetes (odds ratio [OR]: 4.8, 95% CI: 1.9-11.7, P=0.001), but not obesity (OR: 1.6, 95% CI: 0.7-4.2, P=0.28) or chronic obstructive pulmonary disease (OR: 2.2, 95% CI: 0.87-5.6, P=0.1) was a relevant comorbid condition for sternal complications. Skeletonization of ITA grafts (OR: 0.17, 95% CI: 0.06-0.5, P=0.001) and the augmented use of sternal wires (OR: 0.24, 95% CI: 0.06-0.95, P=0.04) were highly effective in preventing sternal complications. The use of platelet-enriched-fibrin glue (PRF) sealant, however, was associated with more superficial sternal infections (OR: 3.7, 95% CI: 1.3-10.5, P=0.02).

CONCLUSIONS

Adjusted for common risk factors, skeletonization of BITA grafts together with augmented sternal wires is effective in preventing sternal complications. The use of PRF sealant, however, increased the risk for superficial wound complications.

A new cable-tie-based sternal closure device: infectious considerations

OBJECTIVES

To determine the difference in sternal infection and other infectious events between conventional wire and cable-tie-based closure techniques post-sternotomy in a collective of patients after cardiac surgery.

METHODS

The sternal ZipFix™ (ZF) system consists of a biocompatible poly-ether-ether-ketone (PEEK) cable-tie that surrounds the sternum through the intercostal space and provides a large implant-to-bone contact. Between 1 February 2011 and 31 January 2012, 680 cardiac operations were performed via sternotomy at our institution. After the exclusion of operations for active endocarditis and early mortality within 7 days, 95 patients were exclusively closed with ZF and could be compared with 498 who were closed with conventional wires (CWs) during the same period. A multivariable logistic regression analysis, including body mass index, renal impairment and emergency as suspected confounders and inverse propensity weights was performed on the infection rate.

RESULTS

Total infection rate was 6.1%, with a total of 36 diagnosed sternal infections (5 in ZF and 31 in CW). Comparing ZF with CW with regard to sternal infection, there is no statistically significant difference related to the device (odds ratio: 0.067, confidence interval: 0.04-9.16, P=0.72). The propensity modelling provided excellent overlap and the mean propensity was almost the same in both groups. Thus, we have observed no difference in receiving either ZF or CW. No sternal instability was observed with the ZF device, unlike 4/31 patients in the CW group. The overall operation time is reduced by 11 min in the ZF group with identical perfusion and clamping times.

CONCLUSIONS

Our study underlines a neutral effect of the sternal ZipFix™ system in patients regarding sternal infection. Postoperative complications are similar in both sternal closure methods. The cable-tie-based system is fast, easy to use, reliable and safe.

Significant predictors of complications after sternal wound reconstruction: a 21-year experience

BACKGROUND

We sought to identify patient comorbidities that predict complications after tissue flap sternal reconstruction.

METHODS

A retrospective study, December 1989 to December 2010, analyzed numerous comorbidities, including diabetes mellitus (DM), hypertension (HTN), coronary artery disease, congestive heart failure (CHF), and renal insufficiency, as independent risk factors for postoperative complications. Pearson χ2 test, Fisher exact test, 2-sample t test, and median-unbiased estimation were used for data analysis. Significance was P≤0.05.

RESULTS

In all, 106 patients received 161 sternal tissue flap repairs. Nineteen patients (18%) required reoperation because of complications, including recurrent wound infection, tissue necrosis, wound dehiscence, mediastinitis, and hematoma formation. Our analysis found DM, HTN, and CHF as significant predictors of complications after sternal reconstruction (P=0.014, 0.012, and 0.006).

CONCLUSIONS

Results suggest DM, HTN, and CHF may contribute to complications after tissue flap repair of sternal wounds, possibly through impaired perfusion and healing of repairs.

Rigid plate fixation promotes better bone healing after sternotomy

Sternotomy is the most common surgically created osteotomy in surgery. Rigid fixation of osteotomies are important for stability and bony union. This review shows the superiority of rigid plate fixation in achieving better bone healing after sternotomy. It also highlights use of plate fixation for mini-sternotomies and rib fractures.

Chest wall reconstruction for sternal dehiscence after open heart surgery

BACKGROUND

Sternal dehiscence is a grave complication after open heart surgery. Sternal debridement and flap coverage are the mainstays of therapy, but no consensus exists regarding the appropriate level of debridement. More recently, the use of vacuum-assisted closure devices has been advocated as a bridge to definitive closure, but indications for use remain incompletely defined.

MATERIALS AND METHODS

A retrospective review of all chest wall reconstructions performed from January 2000 to December 2010 was conducted. The type of operative management was evaluated to assess morbidity, mortality, and length of hospital stay.

RESULTS

Fifty-four patients underwent chest wall reconstruction for poststernotomy mediastinitis. Of these patients, 24 underwent conservative sternal debridement with flap closure, 24 underwent radical sternectomy including resection of the costal cartilages followed by flap closure, and 6 underwent radical sternectomy with vacuum-assisted closure therapy followed by flap closure in a delayed fashion. There were 15 patients in the conservative group and 8 patients in the radical sternectomy group who developed postoperative complications (62.5% vs 33.3%, P < 0.05). The conservative sternectomy group had more serious complications requiring reoperation compared to the radical sternectomy group (86.7% vs 25.0%, P < 0.05). The most common complication in the former group was flap dehiscence (8/15, 53.3%), whereas that in the latter group was a superficial wound infection (6/8, 75.0%). There was no significant difference in mortality (25.0% vs 25.0%, P > 0.05%) or length of hospital stay.

CONCLUSIONS

Radical sternectomy including the costal cartilages is associated with lower rates of surgical morbidity and reoperation, but not mortality.

Sternal closure with rigid plate fixation versus wire closure: a randomized controlled multicenter trial

BACKGROUND

Rigid bone fixation is the standard of care for all bone reconstructions except that after sternotomy. Sternal reconstruction after median sternotomy using rigid fixation with plates may improve bone healing and reduce pain when compared with wire cerclage.

METHODS

One-hundred forty patients at six centers who were determined preoperatively to be at high risk for sternal wound complications were randomly assigned to sternal closure with rigid plate fixation (n=70) or wire cerclage (n=70). Sternal healing was evaluated at 3 or 6 months by a core laboratory using computed tomography. Pain and function were evaluated at postoperative day 3 through discharge, 3 weeks, 6 weeks, 3 months, and 6 months.

RESULTS

Sternal healing was superior in rigid plate fixation patients at both 3 and 6 months. Mean computed tomography scores in the rigid plate fixation and wire cerclage groups at 3 months were 1.7±1.1 and 0.9±0.8 (p=0.003). At 6 months, the scores were 3.2±1.6 and 2.2±1.1, respectively (p=0.01). At 6 months, 70% of rigid plate fixation patients had achieved sternal union, compared with 24% of conventional wire cerclage patients (p=0.003). Pain scores and narcotic usage were lower in rigid plate fixation patients. Significant differences in pain scores were observed at 3 weeks for total pain (p=0.020) and pain with coughing (p=0.0084) or sneezing (p=0.030). Complication rates were similar in both groups.

CONCLUSIONS

Sternal reconstruction using rigid fixation with plates improved bone healing and reduced early postoperative pain compared with wire cerclage.

Efficacy of Thermoreactive Nitinol Clip Implantation in Reconstruction of Sternal Dehiscence

<p><b>Background:</b> Sternal dehiscence is a severe complication of open heart surgery. Reinforced wiring, a system of reinforced sternal closure, fixation of a rigid plate, and implantation of thermoreactive nitinol clips (TRC) are some surgical procedures used. The aim of this study was to evaluate the role of TRC for secondary sternal reconstruction.</p><p><b>Methods:</b> Of 1198 patients who underwent their operations via median sternotomy in 2 separate medical centers, sternal dehiscence was observed in 16 patients overall (1.33%). The mean (SD) age of the patients was 64.06 � 9.18 years (range, 40-77 years). Sternal dehiscence was diagnosed in all patients between the fifth and 30th postoperative days.</p><p><b>Results:</b> TRC were implanted in all of the patients who developed sternal dehiscence (16 patients). One patient developed severe respiratory failure, became ventilator dependent, and died from pneumonia on postoperative day 24. The other 15 patients were discharged without complications. Postoperative follow-up of the surviving patients revealed adequate and satisfactory sternal stability.</p><p><b>Conclusion:</b> Implantation of TRC is an effective and easy method for fixing the sternum and can be performed rapidly and securely.</p>

Overview and management of sternal wound infection

Sternal wound infection is a life-threatening complication after cardiac surgery associated with high morbidity and mortality. Past treatment options have included closed suction and continuous irrigation. Current paradigms in the management of sternal wound infection include surgical debridement, vacuum-assisted closure therapy, flap coverage, and sternal plating. We provide a general overview of sternal wound infection and treatment options for the plastic surgeon.

Stabilization of the chest wall: autologous and alloplastic reconstructions

The goals of chest wall stabilization include maintenance of a rigid airtight cavity, protection of the thoracic and abdominal contents, optimization of respiration, and, whenever possible, an aesthetic reconstruction. Evidence suggests that bony fixation results in reduced ventilator dependence, a shorter overall hospital stay, and improved upper extremity function. We prefer to accomplish this with autologous tissue alone (such as the pectoralis major, latissimus dorsi, or rectus abdominus muscle flaps) for small to moderate defects. En bloc resection of defects larger than 5 cm or containing four or more ribs will likely benefit from chest wall stabilization. For patients previously treated with radiation, even larger defects may be tolerated owing to fibrosis. For these larger defects, methyl methacrylate composite meshes are used and covered with vascularized tissue. Contaminated wounds are generally reconstructed with bioprosthetic mesh rather than synthetic mesh. Using these principles, the reconstructive plastic surgeon can devise a comprehensive and safe plan to repair tremendous defects of the chest wall.

A massive post-sternotomy sternal defect treated by allograft sternal transplantation

We report a case of a patient with complete sternal destruction after cardiac surgery, who underwent total sternal replacement with sternal allograft, titanium bars, and screws.

Recurrent bilateral breast abscesses after sternotomy

Median sternotomy is the most commonly used incision in cardiothoracic procedures. Development of breast abscess after sternotomy is a very rare situation. We present a case of sternal wound infection with recurrent bilateral breast abscess after sternotomy. Our case is the first and only case in the literature due to the presence of sternal wound infection with recurrent bilateral breast abscess after sternotomy.

Resynthesis of sternal dehiscence with autologous bone graft and autologous platelet gel

Postoperative management of sternal dehiscence requires the organised effort of a multidisciplinary medical team, including orthopaedic surgeons, plastic surgeons, microbiologists, critical care nurses and rehabilitation experts. Clinical care of this complication impacts heavily on health-care costs, length of hospital stay, and the time to full recovery and return to regular work activity. There are various surgical approaches to sternal resynthesis, but they are often unsuccessful. In this paper, we describe the case of a 67-year-old male complaining of chronic pain due to sternal dehiscence after coronary artery bypass grafting surgery. We first report a technique for sternal resynthesis, performed in the cardiac surgery setting, using a combination of autologous bone graft and autologous platelet-derived gel (APG), and describe its postoperative management and outcome. The four-month follow-up was uneventful and a CT scan confirmed full healing of the nonunion site with solid bridging bone.

A bioresorbable osteosynthesis device can induce an earlier sternal fusion after median sternotomy

OBJECTIVES

We examined the impact of the bioresorbable osteosynthesis sternal pin (Super Fixsorb 30) on sternal healing after median sternotomy.

METHODS

Sixty-three patients who underwent aortic surgery through median sternotomy between January 2006 and March 2009 were analysed. Sternal pins were utilized in 36 patients in addition to the standard closure of the sternum with Ethibond sutures (Group A), and 27 patients received no pins with the standard Ethibond sternal closure (Group B). The occurrence of transverse sternal dehiscence, anterior-posterior displacement and complete fusion of the sternum were evaluated by a computed tomography scan. The cross-sectional cortical bone density area (CBDA) of the sternum was examined to evaluate the osteoconductivity of the sternal pin over a 12-month period.

RESULTS

There was no sternal displacement (0%) observed in Group A at discharge. Meanwhile, five displacements (18.5%) were observed in Group B (P = 0.007). The complete sternal fusion rates at 12 months postoperatively were 100% in Group A, and 21.6% in Group B (P < 0.001). A significant increase in the CBDA was observed in Group A (P < 0.001; between CBDA at discharge and 12 months postoperatively).

CONCLUSIONS

The Super Fixsorb 30 sternal pin reduced an anterior-posterior sternal displacement and facilitated an earlier sternal fusion. The pin may have the potential to promote osteogenesis.

Titanium plate fixation for a dehisced sternum following coronary artery bypass grafting: a case report

Sternal dehiscence is one of the most troublesome complications following cardiac surgery. Treatment failure and consequent lethal results are very common, even with all the efforts to resolve sternal dehiscence such as removal of infectious tissue, muscle flap interposition, and sternal rewiring. We report on a case of sternal osteomyelitis following coronary artery bypass grafting that was successfully treated with wide sternal resection, titanium plate fixation, and pectoralis muscle flap interposition.

First experience with a new negative pressure incision management system on surgical incisions after cardiac surgery in high risk patients

BACKGROUND

Sternal wound infection remains a serious potential complication after cardiac surgery. A recent development for preventing wound complications after surgery is the adjunctive treatment of closed incisions with negative pressure wound therapy. Suggested mechanisms of preventive action are improving the local blood flow, removing fluids and components in these fluids, helping keep the incision edges together, protecting the wound from external contamination and promoting incision healing. This work reports on our initial evaluation and clinical experience with the Prevena™Incision Management System, a recently introduced new negative pressure wound therapy system specifically developed for treating closed surgical incisions and helping prevent potential complications. We evaluated the new treatment on sternal surgical incisions in patients with multiple co-morbidities and consequently a high risk for wound complications.

METHODS

The Prevena™incision management system was used in 10 patients with a mean Fowler risk score of 15.1 [Range 8-30]. The negative pressure dressing was applied immediately after surgery and left in place for 5 days with a continuous application of -125 mmHg negative pressure. Wounds and surrounding skin were inspected immediately after removal of the Prevena™ incision management system and at day 30 after surgery.

RESULTS

Wounds and surrounding skin showed complete wound healing with the absence of skin lesions due to the negative pressure after removal of the Prevena™ dressing. No device-related complications were observed. No wound complications occurred in this high risk group of patients until at least 30 days after surgery.

CONCLUSIONS

The Prevena™system appears to be safe, easy to use and may help achieve uncomplicated wound healing in patients at risk of developing wound complications after cardiothoracic surgery.

Pilot Study of Sternal Plating for Primary Closure of the Sternum in Cardiac Surgical Patients

Objective

Postoperative sternal wound complications are a significant problem in high-risk patients. In addition to closure with conventional wires, several systems involving rigid fixation with metal plates are currently available. The Rapid Sternal Closure System (Talon) is approved for stabilization and fixation of the anterior chest wall. Anecdotal evidence suggests that use of the Talon may result in improved postoperative recovery.

Methods

Fifty-one cardiac surgical patients at higher risk for sternal wound complications were enrolled at two sites. Subjects were randomized to insertion of Talons (n = 28) or wires only (control, n = 23) for sternal closure. The primary endpoint was a comparison between study groups of the percent of baseline incentive spirometry volume through postoperative day 7. Secondary endpoints included other measures of quality of recovery, sternal wound infection, and nonunion.

Results

The percentage of preoperative incentive spirometry volume achieved was higher in the Talon arm (67% ± 32%) versus control (58% ± 24%); however, this was not statistically significant (P = 0.41). Use of the Talon was associated with decreased use of opiates (21.3 ± 11.8 vs 25.4 ± 21.6 mg, P = 0.44), increased ability to ambulate 1000 ft on postoperative day 5 (25% vs 13%, P = 0.28), and decreased duration of mechanical ventilation (median 0.5 vs 1.0 days, P = 0.24) and hospital length of stay (4.5 ± 3.2 vs 5.3 ± 4.0 days, P = 0.40). One superficial sternal wound infection was observed in each study arm. There were no cases of nonunion.

Conclusions

In this pilot study, the primary endpoint was not statistically different between the treatment groups. Use of the Talon was associated with trends toward benefit in endpoints consistent with enhanced postoperative recovery, highlighting a need for additional data from larger randomized trials.

Rigid sternal fixation improves postoperative recovery

Introduction:

During the past five years, ridged sternal fixation has been utilized for sternal closure after cardiac surgery. It is known that this procedure provides better sternal stability; however, its contribution to patient recovery has not been investigated.

Methods:

Retrospective chart review was conducted for patients who underwent CABG and/or valve surgery in our institution between 2009 and 2010. Preoperative, perioperative, and follow-up data of patients with ridgid fixation (group R, n=89) were collected and compared with those patients with conventional sternal closure (group C, n=133). The decision regarding the sternal closure method was based on the surgeon’s preferences. Univariate followed by multivariate analyses were performed to evaluate the dominant factor of sternal lock usage and to evaluate postoperative recoveries. The factors included in the analyses were; age, sex, coronary risk factors, urgency of surgery, ejection fraction, coronary anatomy, preoperative stroke, renal function, and preoperative presence of heart failure. All statistical analyses were performed by JMP software.

Results:

Group R was younger (62 ± 9 in group R vs 69 ± 11 in group C, p<0.0001) than group C, more male dominant (61% vs 49%, p=0.0452), had a lower percentage of patients undergoing redo-surgery (2.2% vs 9.0%, p<0.0418), was more likely to be used in isolated coronary artery bypass grafting (71% vs 46%, p=0.0002), more often to be used for large patient (body mass index, BMI greater than 30) (58% vs 37%. P=0.0045), and patients were more likely to have a low EuroSCORE (2.6 ± 2.3 vs 4.4 ± 2.7). Intubation time (13 ± 20 hours vs 39 ± 97 hours, p=0.0030), ICU stay (58 ± 40 hours vs 99 ± 119 hours, p=0.0003), and postoperative length of stay (7.0 ± 3.7 days vs 8.4 ± 4.7 days, p<0.0141) were significantly shorter in group R than group C. Multivariate analyses showed ridged sternal fixation was the most dominant factor affecting intubation time and ICU stay.

Conclusion:

Rigid sternal fixation systems were more frequently applied to low risk young male patients. Among these selected patients, ridgid sternal fixation can contribute to early patient recovery.

Bone healing after median sternotomy: a comparison of two hemostatic devices

Background

Bone wax is traditionally used as part of surgical procedures to prevent bleeding from exposed spongy bone. It is an effective hemostatic device which creates a physical barrier. Unfortunately it interferes with subsequent bone healing and increases the risk of infection in experimental studies. Recently, a water-soluble, synthetic, hemostatic compound (Ostene^®) was introduced to serve the same purpose as bone wax without hampering bone healing. This study aims to compare sternal healing after application of either bone wax or Ostene^®.

Methods

Twenty-four pigs were randomized into one of three treatment groups: Ostene^®, bone wax or no hemostatic treatment (control). Each animal was subjected to midline sternotomy. Either Ostene^® or bone wax was applied to the spongy bone surfaces until local hemostasis was ensured. The control group received no hemostatic treatment. The wound was left open for 60 min before closing to simulate conditions alike those of cardiac surgery. All sterni were harvested 6 weeks after intervention.

Bone density and the area of the bone defect were determined with peripheral quantitative CT-scanning; bone healing was displayed with plain X-ray and chronic inflammation was histologically assessed.

Results

Both CT-scanning and plain X-ray disclosed that bone healing was significantly impaired in the bone wax group (p < 0.01) compared with the other two groups, and the former group had significantly more chronic inflammation (p < 0.01) than the two latter.

Conclusion

Bone wax inhibits bone healing and induces chronic inflammation in a porcine model. Ostene^® treated animals displayed bone healing characteristics and inflammatory reactions similar to those of the control group without application of a hemostatic agent.

Primary sternal closure with titanium plate fixation: plastic surgery effecting a paradigm shift

BACKGROUND

Postoperative mediastinitis is a serious and potentially lethal complication from cardiac surgery. Although postoperative mediastinitis cannot be reliably predicted, a number of preoperative and intraoperative risk factors have been defined by previous work. The authors now present their cumulative experience with primary sternal fixation of high-risk patients as one preventative measure.

METHODS

A retrospective review from July of 2000 to October of 2006 was performed on 750 patients who had at least three established risk factors for postoperative mediastinitis and received primary titanium plate sternal fixation. Patients were followed for a minimum of 6 weeks and monitored for pain, instability, wound breakdown, and plate migration.

RESULTS

Rigid plate fixation was completed at the end of the primary cardiac surgical procedure in all 750 patients. Sternal dehiscence occurred in 18 patients (2.4 percent), necessitating reexploration. Four of these patients developed postoperative mediastinitis and had other significant comorbidities, such as ongoing inflammatory breast cancer or pneumonia, that were beyond the typical risk factors identified for developing mediastinitis. Successful sternal fixation was therefore accomplished in 732 patients (97.6 percent). Despite changes in instrumentation and technique, this approach was adopted by the cardiac surgical team consistently after an initial mentoring and training period by the plastic surgeons.

CONCLUSIONS

Primary sternal fixation is a simple and reliable method for prevention of postoperative mediastinitis development in high-risk patients. This technique, conceptualized by plastic surgeons, is now being implemented by cardiac surgeons in increasing numbers. This demonstrates the ability for plastic surgery to initiate a paradigm shift in other fields of medicine and to decrease the complications that primarily affect our practice.