Single-incision laparoscopic surgery (SILS) for children with Crohn's disease.

PURPOSE: Single-incision laparoscopic surgery (SILS) has been described in adults with Crohn's disease, but its use in pediatric Crohn's patients has been limited. The purpose of this study was to review our experience with SILS in pediatric patients with Crohn's disease. METHODS: A retrospective review was performed for patients diagnosed with Crohn's disease who underwent small bowel resection or ileocecectomy at a freestanding children's hospital from 2006 to 2014. Data collected included demographic data, interval from diagnosis to surgery, operative time, length of stay, and postoperative outcomes. RESULTS: Analysis identified 19 patients who underwent open surgery (OS) and 41 patients who underwent SILS. One patient (2.4 %) within the SILS group required conversion to OS. Demographic characteristics were similar between the 2 cohorts. The most common indication for surgery was stricture/obstruction (SILS 70.7 % vs. OS 68.4 %, p = 0.86), and ileocecectomy was the most common primary procedure performed (SILS 90.2 % vs. OS 100 % OS). Operative times were longer for SILS (135 ± 50 vs. 105 ± 37 min, p = 0.02). However, when the last 20 SILS cases were compared to all OS cases, the difference was no longer statistically significant (SILS 123.3 ± 34.2 vs. OS 105 ± 36.5, p = 0.12). No difference was noted in postoperative length of stay (SILS 6.5 ± 2.2 days vs. OS 7.4 ± 2.2 days, p = 0.16) or overall complication rate (SILS 24.4 % vs. OS 26.3 %, p = 0.16). CONCLUSION: SILS ileocecectomy is feasible in pediatric patients with Crohn's disease, achieving outcomes similar to OS. As experience increased, operative times also became comparable.

Subcutaneous Endoscopic-Assisted Ligation of the Internal Ring for Inguinal Hernia Repair in Neonates Under Spinal Anesthesia.

Introduction: While laparoscopy is now widely accepted for inguinal hernia repair in infants, it traditionally has required general anesthesia. We sought to evaluate the safety of laparoscopic inguinal hernia repair in infants under spinal anesthesia. Materials and Methods: We performed a retrospective cohort study of all inguinal hernia repairs at a single institution between December 2011 and June 2019 in patients younger than 6 months of age. Four groups were compared: laparoscopic under general anesthesia, laparoscopic with spinal anesthesia, open with spinal anesthesia, and open under general anesthesia. Main outcome measures include operative time, cost, and postoperative outcomes. These were assessed using Kruskal-Wallis median comparison. Results: Of the 226 patients meeting inclusion criteria, 54% (122/226) of patients underwent general anesthesia, while 46% (104/226) had spinal. When compared to general anesthesia, spinal anesthesia was associated with significantly shorter procedure times (P < .01) and lower cost (P < .01) for both open and laparoscopic approaches. Complications were few and underpowered to calculate significance across each group. Conclusions: Laparoscopic inguinal hernia repair can be safely performed in infants under spinal anesthesia without significant compromise of early perioperative outcomes. Advantages may include shorter procedure time and lower cost.

Return of the Banana Knife: An Alternative Instrument for Laparoscopic Pyloromyotomy.

Background: When the disposable arthroscopic banana knife (Linvatec, Largo, FL) became unavailable, many pediatric surgeons adapted the use of spatula tip cautery for laparoscopic pyloromyotomy; however, reusable arthroscopic knives remain readily available and are well suited to the procedure. Methods: We compared laparoscopic pyloromyotomy with a reusable arthroscopic banana knife (Sklar, West Chester, PA; catalog no. 45-6050) to those using spatula tip cautery at a single institution between September 1, 2012, and December 31, 2019. Mann-Whitney U test was used to compare operative time, room time, and time to discharge between groups. Results: Overall, 109 patients underwent pyloromyotomy for hypertrophic pyloric stenosis during the study time period. Of these, 12 were open and one was undertaken with the Storz pyloromyotomy knife, so these were excluded. A total of 74 (77.1%) laparoscopic cases with spatula tip cautery and 22 (22.9%) with the banana knife were included. Mean age at the time of surgery was ∼37 days. The majority of patients in each group were white, male, and full term. The most common comorbid conditions were reactive airway disease and neonatal abstinence syndrome. There were no significant differences in operative time (P = .61), room time (P = .41), or time from surgery to discharge (P = .26) between procedures using the banana knife and those using the cautery spatula tip. There were no perforations or recurrences. Conclusion: Our findings suggest that the reusable banana knife is a safe and effective alternative to spatula tip cautery for laparoscopic pyloromyotomy, with no difference in operative time, time from surgery to discharge, or complications.

Spontaneous reversal of stenosis in tissue-engineered vascular grafts.

We developed a tissue-engineered vascular graft (TEVG) for use in children and present results of a U.S. Food and Drug Administration (FDA)-approved clinical trial evaluating this graft in patients with single-ventricle cardiac anomalies. The TEVG was used as a Fontan conduit to connect the inferior vena cava and pulmonary artery, but a high incidence of graft narrowing manifested within the first 6 months, which was treated successfully with angioplasty. To elucidate mechanisms underlying this early stenosis, we used a data-informed, computational model to perform in silico parametric studies of TEVG development. The simulations predicted early stenosis as observed in our clinical trial but suggested further that such narrowing could reverse spontaneously through an inflammation-driven, mechano-mediated mechanism. We tested this unexpected, model-generated hypothesis by implanting TEVGs in an ovine inferior vena cava interposition graft model, which confirmed the prediction that TEVG stenosis resolved spontaneously and was typically well tolerated. These findings have important implications for our translational research because they suggest that angioplasty may be safely avoided in patients with asymptomatic early stenosis, although there will remain a need for appropriate medical monitoring. The simulations further predicted that the degree of reversible narrowing can be mitigated by altering the scaffold design to attenuate early inflammation and increase mechano-sensing by the synthetic cells, thus suggesting a new paradigm for optimizing next-generation TEVGs. We submit that there is considerable translational advantage to combined computational-experimental studies when designing cutting-edge technologies and their clinical management.

Intestinal Function after Early versus Late Appendectomy in Children with Perforated Appendicitis.

The aim was to prospectively document the impact of early versus late appendectomy on intestinal function in pediatric perforated appendicitis. After Institutional Review Board approval, between September 2016 and August 2017, complete data were prospectively collected for children undergoing planned appendectomy for perforated appendicitis. One hundred children with pathologist-confirmed transmural perforations were included. The median time to operation after pain onset was three days. Operation on day 1 or 2 (early) was compared with that on day 3 or after (late) (range, 3-9 days). Emesis, nasogastric tubes, and time to tolerate diet evaluated intestinal function. Categorical and continuous variables were analyzed by chi-square and t tests. Of the 100, there were 45 in the early and 55 in the late group, with 22/55(40%) operated on day 3. Children with early appendectomy were significantly younger, 7.8 (3.5) versus 9.5 (3.8) years (P = 0.02). Pre-appendectomy, more than 80 per cent of each group had emesis (P = 0.84), but the late group had a 10-fold increase in nasogastric tube use (P = 0.02). The early group tolerated regular diet significantly faster, 2.5 (2.1) versus 4.4 (4.1) days (P = 0.01), and had a significantly shorter hospital stay, 3.5 (2.2) versus 5.6 (4.3) days (P = 0.01). When pain onset to appendectomy is less than three days, the time to return of intestinal function is significantly reduced.

Surgery Residents and Family Dynamics: Are Our Trainees Equipped to Handle Patient Care Beyond Disease?

Surgical trainees are expected to demonstrate family-centered care. However, it is unclear if residents know how to address psychosocial issues of pediatric patients and their families. Our aim was to evaluate surgical trainees' knowledge of family dynamics. Over a six-month period, trainees (n = 16) were surveyed regarding their comfort and familiarity with the psychosocial aspects of patient care and family dynamics. Residents recorded their comfort level with managing various behaviors using a Likert scale, and indicated which family issues they felt least prepared to handle. Most trainees lacked knowledge of family adjustment phases (50%), relational triangles (78%), developmental stages of families (40%), ambiguous loss (75%), ABCX model of family stress (100%), and the SPIKES model (88%). Excluding anxiety and sadness, almost half of residents felt unprepared for dealing with a variety of challenging behaviors. Finally, trainees were least comfortable with breaking bad news. A Family Dynamics curriculum could potentially increase resident management skills and improve patient care.

Designing a tissue-engineered tracheal scaffold for preclinical evaluation.

OBJECTIVE: Recent efforts to tissue engineer long-segment tracheal grafts have been complicated by stenosis and malacia. It has been proposed that both the mechanical characteristics and cell seeding capacity of TETG scaffolds are integral to graft performance. Our aim was to design a tracheal construct that approximates the biomechanical properties of native sheep trachea and optimizes seeding with bone marrow derived mononuclear cells prior to preclinical evaluation in an ovine model. METHODS: A solution of 8% polyethylene terephthalate (PET) and 3% polyurethane (PU) was prepared at a ratio of either 8:2 or 2:8 and electrospun onto a custom stainless steel mandrel designed to match the dimensional measurements of the juvenile sheep trachea. 3D-printed porous or solid polycarbonate C-shaped rings were embedded within the scaffolds during electrospinning. The scaffolds underwent compression testing in the anterior-posterior and lateral-medial axes and the biomechanical profiles compared to that of a juvenile ovine trachea. The most biomimetic constructs then underwent vacuum seeding with ovine bone marrow derived mononuclear cells. Fluorometric DNA assay was used to quantify scaffold seeding. RESULTS: Both porous and solid rings approximated the biomechanics of the native ovine trachea, but the porous rings were most biomimetic. The load-displacement curve of scaffolds fabricated from a ratio of 2:8 PET:PU most closely mimicked that of native trachea in the anterior-posterior and medial-lateral axes. Solid C-ringed scaffolds had a greater cell seeding efficiency when compared to porous ringed scaffolds (Solid: 19 × 104 vs. Porous: 9.6 × 104 cells/mm3, p = 0.0098). CONCLUSION: A long segment tracheal graft composed of 2:8 PET:PU with solid C-rings approximates the biomechanics of the native ovine trachea and demonstrates superior cell seeding capacity of the two prototypes tested. Further preclinical studies using this graft design in vivo would inform the rational design of an optimal TETG scaffold.

Routine Bronchoscopy and Fogarty Catheter Occlusion of Tracheoesophageal Fistulas.

INTRODUCTION: Use of a Fogarty catheter for emergent occlusion of tracheoesophageal fistulas (TEFs) has been described for use in unstable neonates. Our purpose was to describe a case series of elective Fogarty catheter occlusion of the TEF. MATERIALS AND METHODS: A formal operative laryngoscopy and rigid bronchoscopy were performed with Fogarty catheter placement into the fistula before surgical intervention. The balloon was inflated and gentle traction provided occlusion of the tract. An endotracheal tube was then placed in a midtracheal location irrespective of fistulous tract location. The Fogarty catheter was removed at the time of fistula ligation. RESULTS: Six patients underwent Fogarty catheter occlusion of the TEF at the time of repair. The average gestational age was 38 ± 2 weeks and birth weight was 2499 ± 399 g. Associated anomalies or comorbidities were present in 2 of 6 patients (33%). Five patients (83%) had an esophageal atresia with distal TEF, all of whom underwent surgical intervention before day of life (DOL) 2. Of these patients, 3 were performed thoracoscopically, 1 was converted from thoracoscopic to open, and 1 was initiated as an open procedure. One patient had an H-type fistula, which was repaired through a cervical approach on DOL 48. Average time required for both bronchoscopy and Fogarty placement was 10 ± 2 minutes. There were no complications associated with Fogarty catheter placement and catheter dislodgement did not occur during any of the procedures. CONCLUSION: Elective Fogarty catheter occlusion of TEF can be performed safely and expeditiously, alleviating many perioperative challenges of TEF.

Endoscopic management of tissue-engineered tracheal graft stenosis in an ovine model.

OBJECTIVE: To evaluate the safety and efficacy of bronchoscopic interventions in the management of tissue-engineered tracheal graft (TETG) stenosis. STUDY DESIGN: Animal research study. METHODS: TETGs were constructed with seeded autologous bone marrow-derived mononuclear cells on a bioartificial graft. Eight sheep underwent tracheal resection and orthotopic implantation of this construct. Animals were monitored by bronchoscopy and fluoroscopy at 3 weeks, 6 weeks, 3 months, and 4 months. Bronchoscopic interventions, including dilation and stenting, were performed to manage graft stenosis. Postdilation measurements were obtained endoscopically and fluoroscopically. RESULTS: Seven dilations were performed in six animals. At the point of maximal stenosis, the lumen measured 44.6 ± 8.4 mm2 predilation and 50.7 ± 14.1 postdilation by bronchoscopy (P = 0.3517). By fluoroscopic imaging, the airway was 55.9 ± 12.9 mm2 predilation and 65.9 ± 22.4 mm2 postdilation (P = 0.1303). Stents were placed 17 times in six animals. Pre- and poststenting lumen sizes were 62.8 ± 38.8 mm2 and 80.1 ± 54.5 mm2 by bronchoscopy (P = 0.6169) and 77.1 ± 38.9 mm2 and 104 ± 60.7 mm2 by fluoroscopy (P = 0.0825). Mortality after intervention was 67% with dilation and 0% with stenting (P = 0.0004). The average days between bronchoscopy were 8 ± 2 for the dilation group and 26 ± 17 in the stenting group (P = 0.05). One hundred percent of dilations and 29% of stent placements required urgent follow-up bronchoscopy (P = 0.05). CONCLUSION: Dilation has limited efficacy for managing TETG stenosis, whereas stenting has a more lasting clinical effect. LEVEL OF EVIDENCE: NA. Laryngoscope, 127:2219-2224, 2017.

Intravascular Ultrasound Characterization of a Tissue-Engineered Vascular Graft in an Ovine Model.

Patients who undergo implantation of a tissue-engineered vascular graft (TEVG) for congenital cardiac anomalies are monitored with echocardiography, followed by magnetic resonance imaging or angiography when indicated. While these methods provide data regarding the lumen, minimal information regarding neotissue formation is obtained. Intravascular ultrasound (IVUS) has previously been used in a variety of conditions to evaluate the vessel wall. The purpose of this study was to evaluate the utility of IVUS for evaluation of TEVGs in our ovine model. Eight sheep underwent implantation of TEVGs either unseeded or seeded with bone marrow-derived mononuclear cells. Angiography, IVUS, and histology were directly compared. Endothelium, tunica media, and graft were identifiable on IVUS and histology at multiple time points. There was strong agreement between IVUS and angiography for evaluation of luminal diameter. IVUS offers a valuable tool to evaluate the changes within TEVGs, and clinical translation of this application is warranted.

Robotic vs. Laparoscopic Sleeve Gastrectomy in Adolescents; Reality or Hype.

BACKGROUND: The rising prevalence of childhood obesity and concomitant increase in comorbid disease pose significant challenges for the health care system. While mounting evidence demonstrates the safety and efficacy of bariatric surgery for severely obese adolescents, the potential role of robotic technology has not been well defined. OBJECTIVE: The aim of this study was to establish the safety and efficacy of robotic-assisted laparoscopic sleeve gastrectomy (RSG) in treating severe adolescent obesity. In addition, 30-day outcomes and hospital charges were compared to subjects undergoing RSG versus laparoscopic sleeve gastrectomy (LSG). METHODS: A retrospective analysis of 28 subjects (14 LSG vs. 14 RSG) at a single institution was conducted. Data collection included demographics, body mass index, comorbidities, hospital length of stay (LOS), operative time, 30-day outcomes, and hospital charges. Analysis was performed using chi-square, Fisher's exact, and nonparametric Wilcoxon rank sum tests. RESULTS: There were no differences in subject demographics or comorbidities. While median operative time was longer for RSG vs. LSG (132 vs. 100 min, p = 0.0002), the median LOS for RSG compared to LSG was shorter (69.6 vs. 75.9 h, p = 0.0094). In addition, RSG-related hospital charges were higher ($56,646 vs. $49,498, p = 0.0366). No significant differences in post-operative outcomes or complications were observed. CONCLUSIONS: RSG is equally safe and efficacious when compared to LSG among adolescents. Similar to studies in adults, LOS is shortened while hospital charges are higher. Larger prospective studies are needed to gain insight regarding cost benefit ratios.

Minimally Invasive Ileal Pouch-Anal Anastomosis with Rectal Eversion Allows for Equivalent Outcomes in Continence in Pediatric Patients.

BACKGROUND: Different techniques for ileal pouch-anal anastomosis (IPAA) following total proctocolectomy (TPC) have been described in patients with ulcerative colitis (UC), including rectal eversion (RE). RE allows for precise identification of the dentate line, but concerns have been raised regarding continence rates. No studies have specifically evaluated RE in the pediatric population. The purpose of this study was to evaluate the outcomes and continence rates for pediatric patients undergoing minimally invasive surgery (MIS) TPC and IPAA with RE for UC. MATERIALS AND METHODS: All patients who underwent TPC and IPAA were reviewed at our institution. Data collected included demographics, proctocolectomy technique (open without RE versus MIS with RE), operative time, postoperative data, and continence outcomes following ileostomy closure. RESULTS: Thirty-three patients were identified who underwent TPC and IPAA between July 2006 and October 2014. Thirty of these patients underwent ileostomy takedown and were evaluated for continence. Of these, 17 (56.7%) patients had a laparoscopic procedure, 5 (16.7%) had a robotic-assisted procedure, and 8 (26.7%) had an open procedure. There were no statistically significant differences in regard to demographics, operative time, or length of stay when comparing the two groups. There were no differences in the two groups as measured at 1, 6, and 12 months in terms of number of daily stools (P = .93, .09, and .87, respectively), nighttime stooling (P = .29, .10, and .25, respectively), soiling (P = .43, .36, and .52, respectively), or stool-altering medication usage (P = .26, 1.00, and .37, respectively). CONCLUSIONS: The RE technique can be used safely and effectively during MIS TPC and IPAA in children without altering continence rates.

Objective characterization of airway dimensions using image processing.

OBJECTIVES: With the evolution of medical and surgical management for pediatric airway disorders, the development of easily translated techniques of measuring airway dimensions can improve the quantification of outcomes of these interventions. We have developed a technique that improves the ability to characterize endoscopic airway dimensions using common bronchoscopic equipment and an open-source image-processing platform. METHODS: We validated our technique of Endoscopic Airway Measurement (EAM) using optical instruments in simulation tracheas. We then evaluated EAM in a large animal model (Ovis aries, n = 5), comparing tracheal dimensions obtained with EAM to measurements obtained via 3-D fluoroscopic reconstruction. The animal then underwent resection of the measured segment, and direct measurement of this segment was performed and compared to radiographic measurements and those obtained using EAM. RESULTS: The simulation tracheas had a direct measurement of 13.6, 18.5, and 24.2 mm in diameter. The mean difference of diameter in simulation tracheas between direct measurements and measurements obtained using EAM was 0.70 ± 0.57 mm. The excised ovine tracheas had an average diameter of 18.54 ± 0.68 mm. The percent difference in diameter obtained from EAM and from 3-D fluoroscopic reconstruction when compared to measurement of the excised tracheal segment was 4.98 ± 2.43% and 10.74 ± 4.07% respectively. Comparison of these three measurements (EAM, measurement of resected trachea, 3-D fluoroscopic reconstruction) with repeated measures ANOVA demonstrated no statistical significance. CONCLUSIONS: Endoscopic airway measurement (EAM) provides equivalent measurements of the airway with the improved versatility of measuring non-circular and multi-level dimensions. Using optical bronchoscopic instruments and open-source image-processing software, our data supports preclinical and clinical translation of an accessible technique to provide objective quantification of airway diameter.

A mouse model of endocardial fibroelastosis.

BACKGROUND: Endocardial fibroelastosis (EFE) is a pathologic condition of abnormal deposition of collagen and elastin within the endocardium of the heart. It is seen in conjunction with a variety of diseases including hypoplastic left heart syndrome and viral endocarditis. While an experimental model using heterotopic heart transplant in rats has been described, we sought to fully describe a mouse model that can be used to further elucidate the potential mechanisms of and treatments for EFE. MATERIALS AND METHODS: The hearts of 2-day-old C57BL/6 mice were transplanted into the abdomen of 7-week-old C57BL/6 mice. At 2 weeks, the hearts were harvested and histologic analysis was performed using hematoxylin and eosin, Masson's trichrome, Russell-Movat's pentachrome, Picrosirius red, Hart's, Verhoeff-Van Gieson, and Weigert's Resorcin-Fuchsin stains. Additionally, one heart was analyzed using transmission electron microscopy (TEM). RESULTS: Specimens demonstrated abnormal accumulation of both collagen and elastin within the endocardium with occasional expansion into the myocardium. Heterogeneity in extracellular matrix deposition was noted in the histologic specimens. In addition, TEM demonstrated the presence of excess collagen within the endocardium. CONCLUSIONS: The heterotopic transplantation of an immature heart into a mouse results in changes consistent with EFE. This model is appropriate to investigate the etiology and treatment of EFE.

Comparison of 30-day outcomes between thoracoscopic and open lobectomy for congenital pulmonary lesions.

OBJECTIVE: To compare postoperative length of stay and 30-day outcomes between thoracoscopic and open lobectomy performed on a nonemergency basis for congenital pulmonary lesions using a validated national database. MATERIALS AND METHODS: We identified all nonemergency lobectomies performed on patients with congenital pulmonary lesions in the 2012 National Surgical Quality Improvement Program (NSQIP) Pediatric database and compared demographic, clinical, and 30-day outcome characteristics between patients who underwent an open or thoracoscopic lobectomy. Logistic regression with Firth's penalized likelihood bias-reduction method was used to determine predictive risk factors for a postoperative length of stay (LOS) of >3 days. RESULTS: Of 101 patients included, 40 (39%) underwent thoracoscopic lobectomy. In comparison with patients undergoing thoracoscopic lobectomy, patients undergoing open lobectomy were significantly more likely to be admitted prior to surgery, be American Society of Anesthesiologists Class ≥ 3, receive oxygen support prior to surgery, and have other congenital anomalies or cardiac risk factors. Both groups had similar total operative times (open versus thoracoscopic, 150 versus 173 minutes; P=.216). Patients undergoing open lobectomy had longer postoperative LOS (4 versus 3 days; P=.001) and more often received an intraoperative or postoperative transfusion (12% versus 0%; P=.003). The procedure type was not an independent risk factor for postoperative LOS >3 days in the multivariable analysis. CONCLUSIONS: Patients undergoing thoracoscopic lobectomy have fewer comorbidities at baseline, receive fewer perioperative transfusions, and have a shorter postoperative LOS. Accrual of additional patients within the NSQIP Pediatric database will allow for further risk-adjusted analyses to control for differences in baseline characteristics between patients undergoing open and thoracoscopic resections.

Diagnosis and management of pediatric appendicitis, intussusception, and Meckel diverticulum.

Three of the most common causes of surgical abdominal pain in pediatric patients include appendicitis, Meckel diverticulum, and intussusception. All 3 can present with right lower quadrant pain, and can lead to significant morbidity and even mortality. Although ultrasound is the preferred method of diagnosis with appendicitis and intussusception, considerable variety exists in the modalities needed in the diagnosis of Meckel diverticulum. This article discusses the pathways to diagnosis, the modes of treatment, and the continued areas of controversy.