Titanium nitride coating of pectus bar increases metal contamination after minimally-invasive repair of pectus excavatum.

INTRODUCTION: Previous studies demonstrated a release of toxic metals, e.g. nickel and chromium, from stainless steel bars used for minimally invasive repair of pectus excavatum (MIRPE). In the present study, we investigated the impact of titanium nitride coating on the metal release and exposure of MIRPE patients. MATERIAL AND METHODS: We analyzed the courses of nickel and chromium levels in blood, urine and local tissue in patients undergoing MIRPE with a titanium nitride coated pectus bar between 03/2017 and 10/2018. Sample collection was scheduled prior to MIRPE, at defined postoperative time points and at bar removal. Additionally, we evaluated irritative symptoms. Results were compared to a control group who received uncoated stainless steel bars in a previous time period (03/2015-02/2017). RESULTS: 12 patients received coated pectus bars (mean age 15.7 years). The control group included 28 patients. After implantation of a titanium nitride coated bar, significant increase in systemic nickel and chromium levels after one, two and three years was noted. In an interim analysis one year after MIRPE, we observed patients with coated bars to have significantly elevated trace metal values compared to the control group. This elevation persisted throughout the observation period. Tissue metal values were also significantly increased. Irritative symptoms occurred significantly more often in study patients compared to controls (50.0% vs. 14.3%). CONCLUSIONS: Coating of pectus bars with titanium nitride failed to reduce metal contamination after MIRPE. Instead, it resulted in a significant increase of trace metal levels after MIRPE, compared to patients with stainless steel bars, which may be explained by wear of the coating and inter-component mobilization processes.

Nickel contamination after minimally-invasive repair of pectus excavatum persists after bar removal.

BACKGROUND: Minimally-invasive repair of pectus excavatum (MIRPE) has been shown to be associated with high release of trace metals into patient's body. The aim of our study was to analyze the kinetics of metal contamination after MIRPE and after bar removal. METHODS: We prospectively assessed nickel and chromium changes in blood, urine, and local tissue in patients undergoing MIRPE with stainless-steel bar(s). Baseline samples were taken prior to surgery, further samples were taken at six defined time points until 30 months after bar removal. Clinical symptoms were evaluated at the time of every sample collection. RESULTS: 28 patients were included (mean age 16.4 years). At four weeks after MIRPE and persisting up to bar removal, we found significantly elevated trace metal levels in blood and urine. Tissue nickel and chromium levels were significantly elevated at the time of bar removal. After bar removal, the concentration of trace metal in urine and the concentration of chromium in plasma decreased gradually. In contrast, nickel levels in blood further increased. Five patients showed irritative symptoms after MIRPE, all symptomatic patients had elevated metal levels. CONCLUSIONS: Following MIRPE, we found a rapid systemic increase of nickel and chromium. Our data indicate that trace metal release could cause irritative symptoms. The prolonged elevated systemic nickel levels beyond bar removal necessitate further investigations of the long-term side effects of MIRPE.

Treatment Strategies and Outcome of the Exstrophy-Epispadias Complex in Germany: Data From the German CURE-Net.

Introduction: To evaluate the impact of reconstructive strategies and post-operative management on short- and long-term surgical outcome and complications of classical bladder exstrophy (CBE) patients' comprehensive data of the multicenter German-wide Network for Congenital Uro-Rectal malformations (CURE-Net) were analyzed. Methods: Descriptive analyses were performed between 34 prospectively collected CBE patients born since 2009, median 3 months old [interquartile range (IQR), 2-4 months], and 113 cross-sectional patients, median 12 years old (IQR, 6-21 years). Results: The majority of included individuals were males (67%). Sixty-eight percent of the prospectively observed and 53% of the cross-sectional patients were reconstructed using a staged approach (p = 0.17). Although prospectively observed patients were operated on at a younger age, the post-operative management did not significantly change in the years before and after 2009. Solely, in prospectively observed patients, peridural catheters were used significantly more often (p = 0.017). Blood transfusions were significantly more frequent in males (p = 0.002). Only half of all CBE individuals underwent inguinal hernia repair. Cross-sectional patients after single-stage reconstructions showed more direct post-operative complications such as upper urinary tract dilatations (p = 0.0021) or urinary tract infections (p = 0.023), but not more frequent renal function impairment compared to patients after the staged approach (p = 0.42). Continence outcomes were not significantly different between the concepts (p = 0.51). Self-reported continence data showed that the majority of the included CBE patients was intermittent or continuous incontinent. Furthermore, subsequent consecutive augmentations and catheterizable stomata did not significantly differ between the two operative approaches. Urinary diversions were only reported after the staged concept. Conclusions: In this German multicenter study, a trend toward the staged concept was observed. While single-stage approaches tended to have initially more complications such as renal dilatation or urinary tract infections, additional surgery such as augmentations and stomata appeared to be similar after staged and single-stage reconstructions in the long term.

Gravitational Autoreposition for Staged Closure of Omphaloceles.

INTRODUCTION: Management strategies for large omphaloceles remain controversial. In this study, we discuss the use of GRAVITAS (gravitational autoreposition sutures), the method used at our institution when successful primary closure is deemed questionable. Patient's primary clinical course and long-term outcomes were analyzed. MATERIALS AND METHODS: This is a single-center retrospective analysis of all consecutive patients with omphaloceles treated between 1997 and 2018. Decision for GRAVITAS was made when the defect was estimated too large for primary closure. Traction sutures were placed in the fascia surrounding the defect and then suspended from the top of the incubator to allow gravitational autoreposition of the herniated organs. Ventilation and muscle relaxation were maintained until secondary closure, which was performed after the obtruding viscera had been reduced by repeated adjustment of the suture's tension. Data are presented as mean ± standard deviation. RESULTS: Out of 49 patients with omphaloceles, 12 were treated with GRAVITAS, 33 underwent primary closure, and 4 were treated using Schuster's technique. Mean time to secondary closure after GRAVITAS was 7 ± 10 days. In nine of the patients who had isolated omphalocele, secondary closure was achieved after 4 ± 2 days. Ventilation time was 5 ± 2 days, and time to full feeds was 18 ± 16 days. In three patients (one with Fallot's tetralogy, one with Cantrell's pentalogy, and one with lung hypoplasia), abdominal closure was achieved after 17 ± 15 days. Due to cardiorespiratory comorbidity, ventilation time was >30 days. Five patients received initial closure of the skin and secondary fascial closure after 18 ± 15 months. One patient with prior fascial closure underwent later repair of an abdominal wall hernia. During follow-up (30 ± 35 months), one patient with gastrointestinal obstruction due to adhesions required laparotomy, and one patient with gastroesophageal reflux disease underwent fundoplication. CONCLUSION: GRAVITAS is a feasible method for staged closure of large omphaloceles when successful primary closure is deemed questionable.

Surgery for Deformities of the Thoracic Wall: No More than Strengthening the Patient's Self-Esteem?

In most cases, correction of a pectus deformity is performed for cosmetic reasons. The main indication for corrective therapy is impaired body image and self-esteem due to the deformity. In these instances, patients suffer from a lower quality of life that is not correlated with the severity of the chest wall deformity. After correction of a pectus excavatum (PE) or pectus carinatum (PC) patients experience a significant improvement in body image and self-esteem. For many, corrective surgery is life changing as it leaves patients feeling satisfied with the appearance of their chest, and this in turn increases their engagement in social activities. As this correction is mainly performed in adolescence, the treatment has a high impact on the future of patients that is often rooted in decisions made and actions taken during puberty.

Diagnostic accuracy and therapeutic relevance of thoracoscopic lung biopsies in children.

INTRODUCTION: Histopathological assessment of lung biopsies does play an important diagnostic role in children's interstitial lung disease (ChILD). Thoracoscopic lung biopsy has been shown to be safe and effective. The aim of this study was to evaluate the diagnostic accuracy of thoracoscopic lung biopsies in children with ChILD. Furthermore, therapeutic relevance of the procedure, operative details, and perioperative complications of our series were investigated. METHODS: We retrospectively reviewed all consecutive thoracoscopic lung biopsies taken from children with suspected ChILD in our institution over an 11-year period. Feasibility and complications were evaluated as well as histopathological diagnoses according to the recent ChILD classification and relevance of the procedure for medical treatment. RESULTS: Fifty-nine patients (54.2% male, median age 7 years [8 d-18 y]) underwent 112 thoracoscopic lung biopsies. An endostapler (27%), endoloop ligature (63%), or cut and suture technique (10%) were used. A chest tube was placed in 54% of the cases. Complications occurred in 15% of cases and mainly consisted of pneumothoraces or bleedings. Adequate tissue was obtained in all but one case and the biopsy led to a specific diagnosis according to the ChILD classification in 98%. Medical treatment of the underlying disease was changed due to the results of the biopsy in 86%. CONCLUSIONS: The diagnostic accuracy of thoracoscopic lung biopsies in children with suspected ChILD is high. The histopathologic results lead to a disease-specific treatment in the majority of the cases. Thoracoscopic lung biopsy is a safe and effective procedure with a low complication rate.

Trace metal release after minimally-invasive repair of pectus excavatum.

BACKGROUND: Several studies have shown a high incidence of metal allergy after minimally-invasive repair of pectus excavatum (MIRPE). We postulated that MIRPE is associated with a significant release of trace metal ions, possibly causing the allergic symptoms. METHODS: We evaluated the concentration with chromium, cobalt and nickel in blood, urine and tissue in patients prior to MIRPE and in patients who underwent an explantation of the stainless-steel bar(s) after three years. RESULTS: Our study group consisted of 20 patients (mean age 19 years) who had bar explantation and our control group included 20 patients (mean age 16 years) prior to MIRPE. At the time of bar removal we detected significantly elevated concentrations of chromium and nickel in the tissue compared to patients prior to the procedure (p<0,001). We also found a significant increase in the levels of chromium in urine and nickel in blood in patients three years post MIRPE (p<0,001). Four patients temporarily developed symptoms of metal allergy, all had elevated metal values in blood and urine at explantation. CONCLUSIONS: Minimally-invasive repair of pectus excavatum can lead to a significant trace metal exposure.

Advanced age: a contraindication for triple-valve surgery?

BACKGROUND AND AIM OF THE STUDY: With the changing age structure of the population, cardiothoracic surgeons must deal with an increasing number of patients suffering from degenerative valve disease. Septuagenarians with triple valve disease may be refused surgery due to a potentially high perioperative risk related to co-morbidities. The study aim was to elucidate the indications and compare outcome, with a focus on age-related mortality and morbidity. METHODS: Between December 1996 and July 2010, a total of 90 consecutive patients (45 males, 45 females; mean age 68 +/- 9 years; logistic EuroSCORE 21 +/- 16%) underwent triple-valve surgery at Hannover Medical School. Of these patients, 70% had degenerative disease, 19% endocarditis, and 11% a rheumatic cause, while 24% underwent cardiac redo-surgery. For further analysis, the cohort was divided into two groups according to age: < or = 70 years (n=44) and >70 years (n=46). The follow up was performed according to current guidelines for reporting mortality and morbidity after cardiac valve interventions, including a quality of life assessment (Minnesota Living With Heart Failure Questionnaire; MLHFQ). RESULTS: Mortality among the patients was 16%, 24%, and 26% at 30, 60, and 90 days, respectively. The one-year survival was 69% for the whole cohort, and no difference was seen between the age groups. Follow up (mean 46 months) was complete in 96% of all patients who survived at least three months (n=67). Valve-related morbidity was low in both groups, with predominantly a recurrence of tricuspid insufficiency. The MLHFQ score was similar in both groups. CONCLUSION: Triple-valve surgery is associated with a high perioperative risk. However, the acceptance of elderly patients for this surgery is not associated with a higher mortality or valve-related morbidity. The patients' quality of life was acceptable during follow up, and not affected by age. Hence, the refusal of surgery should depend not on old age alone but rather on an individualized assessment of the patient.