The Somatic Mutation Paradigm in Congenital Malformations: Hirschsprung Disease as a Model.

Patients with Hirschsprung disease (HSCR) do not always receive a genetic diagnosis after routine screening in clinical practice. One of the reasons for this could be that the causal mutation is not present in the cell types that are usually tested-whole blood, dermal fibroblasts or saliva-but is only in the affected tissue. Such mutations are called somatic, and can occur in a given cell at any stage of development after conception. They will then be present in all subsequent daughter cells. Here, we investigated the presence of somatic mutations in HSCR patients. For this, whole-exome sequencing and copy number analysis were performed in DNA isolated from purified enteric neural crest cells (ENCCs) and blood or fibroblasts of the same patient. Variants identified were subsequently validated by Sanger sequencing. Several somatic variants were identified in all patients, but causative mutations for HSCR were not specifically identified in the ENCCs of these patients. Larger copy number variants were also not found to be specific to ENCCs. Therefore, we believe that somatic mutations are unlikely to be identified, if causative for HSCR. Here, we postulate various modes of development following the occurrence of a somatic mutation, to describe the challenges in detecting such mutations, and hypothesize how somatic mutations may contribute to 'missing heritability' in developmental defects.

Patient-Reported Outcome Measures and Clinical Outcomes in Children with Foregut Anomalies.

Increasing numbers of children and adults with chronic disease status highlight the need for a value-based healthcare system. Patient-reported outcome measures (PROMs) are essential to value-based healthcare, yet it remains unclear how they relate to clinical outcomes such as health and daily functioning. We aimed to assess the added value of self-reported PROMs for health status (HS) and quality of life (QoL) in the long-term follow-up of children with foregut anomalies. We evaluated data of PROMs for HS and/or QoL among eight-year-olds born with congenital diaphragmatic hernia (CDH), esophageal atresia (EA), or congenital lung malformations (CLM), collected within the infrastructure of a multidisciplinary, longitudinal follow-up program. Clinical outcomes were categorized into different outcome domains, and their relationships with self-reported HS and QoL were assessed through multivariable linear regression analyses. A total of 220 children completed HS and/or QoL self-reports. In children with CDH and EA, lower cognition was significantly associated with lower self-reported HS. Due to the low number of cases, multivariable linear regression analysis was not possible in children with CLM. HS, QoL, and clinical outcomes represent different aspects of a child's wellbeing and should be measured simultaneously to facilitate a more holistic approach to clinical decision making.

Interventions with Music in PECTus excavatum treatment (IMPECT trial): a study protocol for a randomised controlled trial investigating the clinical effects of perioperative music interventions.

INTRODUCTION: Pectus excavatum repair is associated with substantial postoperative pain, despite the use of epidural analgesia and other analgesic regimens. Perioperative recorded music interventions have been shown to alleviate pain and anxiety in adults, but evidence for children and adolescents is still lacking. This study protocol describes a randomised controlled trial that evaluates the effects of recorded music interventions on postoperative pain relief in children and adolescents after pectus excavatum repair. METHODS: A multicentre randomised controlled trial was set up comparing the effects of perioperative recorded music interventions in addition to standard care with those of standard care only in patients undergoing a Nuss procedure for pectus excavatum repair. One hundred and seventy subjects (12-18 years of age) will be included in three centres in the Netherlands. Patient inclusion has started in November 2018, and is ongoing. The primary outcome is self-reported perceived pain measured on the visual analogue scale. Secondary outcomes are anxiety level, analgesics consumption, vital parameters such as heart rate, blood pressure and respiratory rate, length of hospital stay, postoperative complications, quality of life and cost-effectiveness. ETHICS AND DISSEMINATION: This study is being conducted in accordance with the Declaration of Helsinki. The Medical Ethics Review Board of Erasmus University Medical Centre Rotterdam, The Netherlands, has approved this protocol. Results will be disseminated via peer-reviewed scientific journals and conference presentations. TRIAL REGISTRATION NUMBER: NL6863.

Music Interventions in Pediatric Surgery (The Music Under Surgery In Children Study): A Randomized Clinical Trial.

BACKGROUND: Perioperative music interventions have been shown to reduce anxiety and pain in adults. This inexpensive, easily applicable intervention could be of benefit to children as well. Our objective was to determine the effects of music interventions on distress, anxiety, and postoperative pain in infants undergoing surgery. METHODS: The Music Under Surgery In Children study was designed as a parallel, single-blind, randomized controlled trial with an a priori formulated hypothesis. Data were collected between August 2015 and October 2016 in a single tertiary care children's hospital. There was a 24-hour follow-up with blind primary outcome assessment. A random sample of 432 eligible 0-3 years of age infants admitted for orchidopexy, hypospadias, or inguinal hernia repair receiving general anesthesia and caudal block were asked for participation. Subjects were assigned to a preoperative music intervention, pre- and intraoperative music intervention, or no music intervention (control) via random allocation using a computer-generated list with the use of opaque envelopes. The main outcome measure was the postoperative level of distress assessed with the COMFORT-Behavior scale, which is an observational scale; furthermore, preoperative level of distress, preoperative anxiety, and physiological measurements such as heart rate (HR) and blood pressure were measured. The trial was registered at the Dutch Trial Register, number NTR5402 (www.trialregister.nl). RESULTS: One hundred ninety-five infants with median age 6.9 months (interquartile range, 3.3-11.1) were randomized, 178 of whom were included in the primary analysis. A nonsignificant difference in COMFORT-Behavior scale scores between the pre- and intraoperative music intervention group and control group at 4 hours after surgery was found (mean difference, -1.22; 95% CI, 2.60-0.17; P = .085). Additional analysis showed weak nonsignificant evidence for an interaction effect between music exposure and COMFORT-Behavior score at baseline (P = .027 with a Bonferroni-adjusted significance level of .025). General linear modeling showed a statistically significantly reduced HR after the preoperative music intervention in the holding area in the combined preoperative music intervention and intraoperative music intervention group compared to the control group (P = .003). The differences in HR among the 3 study arms at all time points were not statistically significant (P = .069). CONCLUSIONS: Music interventions do not seem to benefit all young infants undergoing surgery. The potential benefits of music interventions in the preoperative period and in more distressed children warrant further exploration.

Clinically relevant timing of antenatal sildenafil treatment reduces pulmonary vascular remodeling in congenital diaphragmatic hernia.

Patients with congenital diaphragmatic hernia (CDH) suffer from severe pulmonary hypertension attributable to altered development of the pulmonary vasculature, which is often resistant to vasodilator therapy. Present treatment starts postnatally even though significant differences in the pulmonary vasculature are already present early during pregnancy. We examined the effects of prenatal treatment with the phosphodiesterase-5 inhibitor sildenafil on pulmonary vascular development in experimental CDH starting at a clinically relevant time. The well-established, nitrofen-induced CDH rodent model was treated daily with 100 mg/kg sildenafil from day 17.5 until day 20.5 of gestation (E17.5-20.5). Importantly, this timing perfectly corresponds to the developmental stage of the lung at 20 wk of human gestation, when CDH is detectable by 2D-ultrasonography and/or MRI. At E21.5 pups were delivered by caesarean section and euthanized by lethal injection of pentobarbital. The lungs were isolated and subsequently analyzed using immunostaining, real-time PCR, and volume measurements. Prenatal treatment with sildenafil improved lung morphology and attenuated vascular remodeling with reduced muscularization of the smaller vessels. Pulmonary vascular volume was not affected by sildenafil treatment. We show that prenatal treatment with sildenafil within a clinically relevant period improves pulmonary vascular development in an experimental CDH model. This may have important implications for the management of this disease and related pulmonary vascular diseases in human.

Transanal endorectal pull-through for classic segment Hirschsprung's disease: with or without laparoscopic mobilization of the rectosigmoid?

BACKGROUND: It has been suggested that the outcome of transanal endorectal pull-through for classic Hirschprung's disease can be improved by laparoscopically mobilizing the colon before the pullthrough. METHODS: Charts of 43 patients (2005-2009) with proven recto-sigmoid aganglionosis were retrospectively analyzed with respect to postoperative outcomes. Twenty-one had been treated with the transanal endorectal pull through (TERPT) and 22 with the laparoscopically assisted TERPT (LTERPT). RESULTS: Gender ratio, congenital anomalies, preoperative enterostomy, and follow up did not differ between the groups. More colon was resected in the TERPT group: median 25 cm vs. 15 cm in the L-TERPT group (p<0.001). The TERPT-procedure took less time: median 153 min. vs. L-TERPT 263 min (p<0.001). Postoperatively, three patients showed colonic torsions after TERPT (p=0.07). The long-term clinical outcomes did not differ significantly between both groups. There was a significant association between length of resection and obstructive symptoms (OR=0.92, p=0.01). CONCLUSION: Postoperative and clinical outcomes are similar using the TERPT or L-TERPT to correct classic segment Hirschsprung's disease. Prevention of colonic torsion should be the prime concern during the TERPT procedure. L-TERPT requires laparoscopic equipment and takes more operation time, whereas TERPT leaves no visible scars. The positive relation between the larger length of resection and obstructive symptoms requires additional research.