New insights on congenital pulmonary airways malformations revealed by proteomic analyses.

BACKGROUND: Congenital Pulmonary Airway Malformation (CPAM) has an estimated prevalence between 0.87 and 1.02/10,000 live births and little is know about their pathogenesis. To improve our knowledge on these rare malformations, we analyzed the cellular origin of the two most frequent CPAM, CPAM types 1 and 2, and compared these malformations with adjacent healthy lung and human fetal lungs. METHODS: We prospectively enrolled 21 infants undergoing surgical resection for CPAM. Human fetal lung samples were collected after termination of pregnancy. Immunohistochemistry and proteomic analysis were performed on laser microdissected samples. RESULTS: CPAM 1 and 2 express mostly bronchial markers, such as cytokeratin 17 (Krt17) or α-smooth muscle actin (ACTA 2). CPAM 1 also expresses alveolar type II epithelial cell markers (SPC). Proteomic analysis on microlaser dissected epithelium confirmed these results and showed distinct protein profiles, CPAM 1 being more heterogeneous and displaying some similarities with fetal bronchi. CONCLUSION: This study provides new insights in CPAM etiology, showing clear distinction between CPAM types 1 and 2, by immunohistochemistry and proteomics. This suggests that CPAM 1 and CPAM 2 might occur at different stages of lung branching. Finally, the comparison between fetal lung structures and CPAMs shows clearly different protein profiles, thereby arguing against a developmental arrest in a localized part of the lung.

Effects of plasma transfusions on antithrombin levels after paediatric liver transplantation.

BACKGROUND AND OBJECTIVES: Thrombotic complications affect 3-10% of patients after liver transplantation (LT), leading to potentially life-threatening complications. In the days following LT, antithrombin (AT) is decreased longer than pro-coagulant factors, thus favouring a pro-thrombotic profile. Plasma transfusions are given empirically in some centres to correct AT levels following LT. We assessed the effect of plasma transfusion on AT levels after paediatric LT. MATERIALS AND METHODS: Prospective single-centre observational study in 20 consecutive paediatric LT recipients over a 24-month period. Plasma was administered twice daily (10 ml/kg/dose) according to an existing protocol. AT levels were measured once daily, immediately prior to and one hour after the morning plasma transfusion. Sample size was calculated based on a non-inferiority hypothesis. RESULTS: The median age and weight were 11.6 years (IQR 2.8; 14.7) and 40 kg (IQR 12.75; 44.8), respectively. We collected 85-paired blood samples. The median AT level prior to plasma transfusion was 58%. The median difference in AT levels before and after plasma transfusion was 4.2% (P = 0.001). Changes in AT levels after plasma transfusion were not correlated with baseline AT levels (R = 0.19) or patient weight (R = 0.18). CONCLUSION: Plasma transfusions only marginally increase AT levels in children after LT. Therefore, prophylactic plasma transfusions probably do not seem to confer an advantage in the routine management of paediatric LT patients. Randomized controlled trials are needed to identify the optimal anticoagulation strategy in this specific population.

[Duplication of the gallbladder with heterotopic mucosa: A case report and proposal for a classification for gastrointestinal duplications]. / Duplication de la vésicule biliaire avec hétérotopie : cas clinique et proposition de classification des duplications gastro-intestinales.

BACKGROUND: Gastrointestinal duplications are rare congenital malformations that can occur anywhere between the mouth and the anus, including the digestive annexes. Numerous classifications of these malformations exist, varying from one author to another. This study describes a rare case of gallbladder duplication and suggests a unified classification of gastrointestinal duplications in order to merge epidemiological and clinical considerations. CASE REPORT: A 13-year-old boy presented with acute abdominal pain. Investigations revealed a cystic structure located in the gallbladder combined with lithiasis. Following an elective laparoscopic cholecystectomy, the diagnosis of gallbladder duplication in association with heterotopic gastrointestinal mucosa and pancreatic micro-clusters was made. The patient is in excellent health 4 years after surgery. COMMENTARY AND CONCLUSION: This atypical duplication is rare and can most likely be explained by the proximity between the pancreas and gastrointestinal tract during their development: the intestinal metaplasia and the development of the gastric mucosa may further represent congenital lesions due to aberrant migration of normal tissue, or could be secondary to a chronic inflammatory response in the gallbladder. The revised standardized classification we propose is based on the accurate identification, precise location and detailed histology of the lesions.

Long-term outcome of children with patent processus vaginalis incidentally diagnosed by laparoscopy.

INTRODUCTION: Patent processus vaginalis (PPV) might be incidentally diagnosed during laparoscopy. The aims of this study were to determine the prevalence and the natural history of PPV, i.e. its possible development into symptomatic inguinal hernia. INCLUSION CRITERIA: children <16years undergoing laparoscopy for pathologies other than processus vaginalis (PV) related, from 10/2000-10/2005. EXCLUSION CRITERIA: past or present history of PV-related pathologies. The internal inguinal rings were documented during laparoscopy. Follow-up was provided by phone inquiry and clinical examination if needed. Median follow-up was 10.5years (range 7.1-12.8). RESULTS: 416 patients were included. Median age at laparoscopy was 12.4years (range 3days-18.1years). Forty-three PPV (33 unilateral, 5 bilateral) were found in 38 patients (9.1%). Four children with PPV presented later with an ipsilateral inguinal hernia (10.5%, 95%CI [3%; 25%]), at a median age of 16.0years (range 11.8-17.3), at a median of 22.5months (range 12-50) after initial laparoscopy, as compared to no patient in the population with obliterated PV (0%, 95%CI [0%; 1%]). CONCLUSION: 9.1% of the observed pediatric population showed an asymptomatic PPV, and 10.5% of these children later developed an inguinal hernia. None of the children with obliterated PV developed a hernia.

[KidsETransplant--a serious game for children with liver disease or liver transplant]. / KidsETransplant--un serious game pour les enfants greffés ou malades du foie.

In Switzerland all children's liver transplants are centralized at the University Hospitals of Geneva (HUG) since 1989. Approximately 150 children have received transplants since then, and their survival rate is higher than 90%--one of the highest in Europe. Maximizing the chances of long-term success requires that patients comply with follow-up treatment, something which mandates a sound understanding of their medical condition. The KidsETransplant project aims to help the child--and his family--to understand better his state of health. To this end, our tool offers secured, unrestricted access to the patient's medical record, with a view to both increase patient autonomy and improve communication with healthcare professionals. This paper describes KidsETransplant, as well as its implemented evaluation process.

Outcomes of combined liver-kidney transplantation in children: analysis of the scientific registry of transplant recipients.

Combined liver-kidney transplantation (CLKT) in children is uncommon and outcomes have not been well defined. Using the Scientific Registry of Transplant Recipients, data were analyzed on 152 primary pediatric CLKTs performed from October 1987 to February 2011, to determine their outcome in the largest series reported to date. Patient survival was 86.8%, 82.1% and 78.9% at 1, 5 and 10 years, liver graft survival was 81.9%, 76.5% and 72.6%, and kidney graft survival was 83.4%, 76.5% and 66.8%. By way of comparison, the Registry was queried for pediatric patient survival following isolated liver transplantation (LT) during the same time frame: 86.7%, 81.2% and 77.4% and following isolated kidney transplant (KT): 98.2%, 95.4% and 90% at 1, 5 and 10 years. In patients having undergone CLKT, primary hyperoxaluria was associated with reduced patient (p = 0.01), liver graft (p = 0.01) and kidney graft survival (p = 0.01). Furthermore, graft outcome following CLKT improved over the past decade (p = 0.04 for liver, p = 0.02 for kidney), but this did not translate into improved patient outcome (p = 0.2). All in all, our results confirmed that survival following LT was less than following KT, and that CLKT offered similar patient survival to isolated LT.

Varicella-zoster immunization in pediatric liver transplant recipients: safe and immunogenic.

Varicella can have a severe course in immunosuppressed patients. Although prevention is fundamental, live-attenuated varicella-zoster (VZV) vaccine is not currently recommended in transplant recipients. Our aims were to (1) evaluate VZV immunity in pediatric liver transplant (LT) recipients; (2) immunize (two doses) seronegative patients post-LT; (3) monitor vaccine safety, (4) assess B and T cell vaccine responses. All patients followed at the Swiss National Pediatric LT Center were approached and 77/79 (97.5%) were enrolled (median age 7.8 years). Vaccine safety was monitored by standardized diary cards and phone calls. VZV-specific serology and CD4(+) T cells were assessed before and after immunization. Thirty-nine patients (51.1%) were seronegative including 14 children immunized pre-LT. Thirty-six of 39 seronegative patients were immunized post-LT (median 3.0 years post LT). Local (54.8%) and systemic (64.5%) reactions were mild and transient. The frequency of VZV-specific CD4(+) T cells and antibody titers increased significantly (respectively from 0.085% to 0.16%, p = 0.04 and 21.0 to 1134.5 IU/L, p < 0.001). All children reached seroprotective titers and 31/32 (97%) patients assessed remained seroprotected at follow-up (median 1.7 years). No breakthrough disease was reported during follow-up (median 4.1 years). Thereby, VZV vaccine appears to be safe, immunogenic and provide protection against disease in pediatric LT patients.

Successful serology-based intervention to increase protection against vaccine-preventable diseases in liver-transplanted children: a 19-yr review of the Swiss national reference center.

As children referred for OLT in Switzerland were not vaccinated optimally, new guidelines were developed and recommended to base catch-up immunization on serum antibody titers against vaccine-preventable diseases, before and after OLT. We measure the results of this serology-based intervention by comparing vaccine coverage and antibody titers in the pre- (1990-2002, P1) and post-intervention (2003-2008, P2) cohorts in a quality control project. Forty-four P1 and 30 P2 children were evaluated. At pre-OLT visit, D, T, SPn, and MMR serologies were checked more frequently in P2 than P1 (p < 0.05). More P2 children were up-to-date for DTaP and MMR (p < 0.05) or had received ≥1 dose of HBV, HAV, SPn, and VZV vaccines (p < 0.05). One yr post-OLT, DT, SPn, MMR, and VZV serologies were more frequently checked (p < 0.05), and antibody titers were higher for DT and HAV (p < 0.05) in P2. Gender, age, or diagnosis did not explain these differences. Among P2 patients, pre- and post-OLT titers for D, T, Hib, HBV, SPn14, and SPn19 were correlated (p < 0.05 for all). Protection against vaccine-preventable diseases of high-risk children like OLT patients can be significantly improved by serology-based intervention for vaccine-preventable diseases.

National survey on abdominal trauma practices of pediatric surgeons.

INTRODUCTION: Pediatric blunt abdominal trauma is a frequent reason for hospital admission, but there are no established guidelines to assess these patients. Our study aims to evaluate the diagnostic process used by pediatric surgeons in Switzerland to evaluate abdominal trauma. MATERIAL AND METHODS: A scenario-based survey was carried out among Swiss pediatric surgeons. Respondents were asked to report on their management of children with blunt abdominal trauma. RESULTS: The response rate was 46% (26 of 54). The clinical signs considered the most important were abdominal examination and palpation (100%), auscultation (81%), external genital exam (77%) and Glasgow Coma Scale (77%). The most frequent laboratory exams requested were urine analysis (100%), complete blood count (96%), liver function tests (85%) and coagulation tests (77%). 42% of the physicians asked for an abdominal ultrasound for every patient with blunt abdominal trauma. 58% reported that some patients do not need a CT scan despite anomalies in the initial workup. There were significant variations in the clinical assessment of patients with minor blunt abdominal trauma. Abnormal ultrasounds, but not abnormal liver functions tests, prompted clinicians to obtain CT scans. When evaluating the probability of organ injury after a full workup, clinicians relied on the results of the ultrasound but not on liver function tests. A normal CT scan did not appear to reassure physicians if the patient still presented with mild abdominal pain. CONCLUSIONS: There is a wide variation in the clinical assessment, request for laboratory tests and use of radiological exams among Swiss pediatric surgeons. Further studies are required on the evaluation of abdominal organ injuries in children.

[Swallowing magnets: a dangerous game. A case report]. / Avaler des aimants : un jeu dangereux. A propos d'une observation.

Complications related to the ingestion of magnetic foreign bodies by children represents an affirmed health hazard in the United States. In France, an alert has been announced. We report the 1st case in France. Our aim is to alert pediatricians and emergency physicians and to draw attention to the particularities of this type of foreign body. Responsible for complications is the ingestion of at least 2 magnets, or 1 magnet and a metallic foreign body, with a time interval between ingestions. In these cases, it is strongly recommended to extract the foreign bodies with endoscopy if they have not yet passed the pylorus. For those further advanced in the intestinal tract, continuous observation is warranted and surgical extraction is indicated on apparition of 1st clinical symptoms.

Antenatal isolated hydronephrosis associated with urinoma.

Two cases of prenatally identified urinoma associated with an isolated hydronephrosis are presented, and the pathophysiology and prognosis of this rare condition are discussed. The presence in utero of a peri-renal collection associated with an isolated hydronephrosis seems to be a sign of significant renal dysplasia. These urinomas disappear spontaneously, thus drainage is not necessary, except in the case of compression of surrounding structures. The functional prognosis of these kidneys seems to be most unfavourable.

The giant umbilical cord.

The giant umbilical cord is a rare malformation of the umbilical cord that can easily be diagnosed on prenatal scans and is unmistakable postnatally. We report a case to highlight issues of this rare finding. Visual diagnosis is easy and surgical repair is usually required.

Intestinal intraepithelial lymphocyte derived angiotensin converting enzyme modulates epithelial cell apoptosis.

BACKGROUND & AIMS: Intestinal adaptation in short bowel syndrome (SBS) consists of increased epithelial cell (EC) proliferation as well as apoptosis. Previous microarray analyses of intraepithelial lymphocytes (IEL) gene expression after SBS showed an increased expression of angiotensin converting enzyme (ACE). Because ACE has been shown to promote alveolar EC apoptosis, we examined if IEL-derived ACE plays a role in intestinal EC apoptosis. METHODS: Mice underwent either a 70% mid-intestinal resection (SBS group) or a transection (Sham group) and were studied at 7 days. ACE expression was measured, and ACE inhibition (ACE-I, enalaprilat) was used to assess ACE function. RESULTS: IEL-derived ACE was significantly elevated in SBS mice. The addition of an ACE-I to SBS mice resulted in a significant decline in EC apoptosis. To address a possible mechanism, tumor necrosis factor alpha (TNF-alpha) mRNA expression was measured. TNF-alpha was significantly increased in SBS mice, and decreased with ACE-I. Interestingly, ACE-I was not able to decrease EC apoptosis in TNF-alpha knockout mice. CONCLUSIONS: This study shows a previously undescribed expression of ACE by IEL. SBS was associated with an increase in IEL-derived ACE. ACE appears to be associated with an up-regulation of intestinal EC apoptosis. ACE-I significantly decreased EC apoptosis.

Total parenteral nutrition-induced apoptosis in mouse intestinal epithelium: regulation by the Bcl-2 protein family.

Apoptosis of intestinal epithelial cells (EC) plays a role in total parenteral nutrition (TPN)-induced villus atrophy. Among the mediators of apoptosis in EC are some members of the Bcl-2 family of proteins. Bcl-2 members can either be anti- (Bcl-2, Bcl-x(L), Bcl-w) or pro-apoptotic (Bax, Bak, Bid, Bad, Bcl-x(S)). To determine whether the observed increase in apoptosis induced by TPN is associated with an alteration in these Bcl-2 members' mRNA expression, mice were randomized to either TPN or oral feeding (controls). Animals were killed after 7 days and the intestine was harvested. EC were purified with magnetic beads. Apoptosis was detected by cell-surface expression of phosphatidylserine using flow cytometry. EC mRNA expression was determined by reverse-transcriptase polymerase chain reaction. Results were expressed relative to beta-actin. TPN resulted in a significant ( P < 0.05, unpaired t-test) increase in apoptosis: TPN 29.4 +/- 11.3% versus control 14.4 +/- 5.1%. The expression of the pro-apoptotic members Bax, Bak, Bid, and Bcl-x(S) was significantly ( P < 0.05) decreased after TPN. In contrast, a significant increase was observed in the anti-apoptotic member Bcl-2. mRNA expression of Bcl-w, Bad, and Bcl-x(L) was not significantly different between the control and TPN groups. Thus TPN-induced apoptosis was associated with an increased expression of anti-apoptotic factors and a decrease in pro-apoptotic factors. This contrasts with other reports where these factors showed converse effects under apoptotic conditions. Our results may demonstrate a unique regulatory pathway that may counter the observed increase in TPN-induced EC apoptosis.