Advances in neonatal surgery

Diagnostic imaging features of necrotizing enterocolitis: a narrative review

Necrotizing enterocolitis (NEC) is an inflammatory process, characterized by intestinal necrosis of variable extension, leading to perforation, generalized peritonitis and death. The classical pathogenetic theory focuses on mucosal damage related to a stress induced intestinal ischemia leading to mucosal injury and bacterial colonization of the wall. A more recent hypothesis emphasizes the role of immaturity of gastrointestinal and immune system, particularly of the premature, responsible of bowel wall vulnerability and suffering. NEC is the most common gastrointestinal emergency in the newborn, with a higher incidence in the preterm; improvement of neonatal resuscitation techniques enables the survival of premature of very low birth weight (VLBW) with prolongation of hospital stay for perinatal and neonatal care and a higher risk of NEC. Clinical presentation of NEC in newborn ranges from mild forms with moderate gastrointestinal tract disorder and that can heal spontaneously, to very serious forms with fulminant course characterized by perforation, peritonitis, sepsis, disseminated intravascular coagulation (DIC) and shock. Imaging modality in the diagnosis of NEC is historically represented by the plain-film abdominal radiographs which can be performed every 6 hours because of the rapid evolution that may occur in the patient's clinical condition. However ultrasound (US), in recent years, is playing an increasingly important role in the evaluation of early stages of the disease as it provides images in real time of the abdominal structures being able to assess the presence and validity of peristalsis of the bowel loops, detect the thickness of the intestinal wall and the presence of minimal amounts of fluid in the peritoneal cavity. In this paper we review the pathogenesis, clinical presentation and imaging of NEC with a particular attention to the emergent role of US in the diagnosis of the disease.

Neonatal surgery in New South Wales--what is performed where?

OBJECTIVES

The aim of this study was to describe what surgical procedures are performed in the neonatal period in New South Wales (NSW) and where they are performed.

METHODS

Population-based descriptive study was conducted in NSW in a 2-year period from July 1, 1996 to June 30, 1998, inclusive, using information from the NSW Health Department's Inpatient Statistics Collection. All neonates undergoing major surgery (excluding circumcisions) in NSW.

RESULTS

In the first 4 weeks of life, 990 (0.6%) neonates underwent surgery. The most common surgical procedures were gastrointestinal, cardiovascular, hernia, genitourinary, and neurosurgical. Frenotomy accounted for 5% of all surgical procedures. Whereas 75% of neonatal surgery (including 88% of gastrointestinal and 97% cardiovascular surgery) occurs in children's hospitals, only 13% of the babies requiring surgery are born in the co-located obstetric hospitals. Perinatal centers accounted for 5.3% of surgery; urban hospitals for 8.4%; rural hospitals, 5.5%, and private hospitals, 6.4%. The mortality rate in the neonatal period was 3.0% overall.

CONCLUSIONS

This is the first review of major neonatal surgery in Australia and provides baseline data for future comparisons. Whereas most neonates had surgery in a children's hospital, few of them were born in the most appropriate place, the co-located obstetric hospital. Parents should be informed of the level of institutional surgical expertise and be involved in the decision-making regarding the place of surgery for their infant. Parents and children have a right to expect the best possible results.

Efficacy of continuous versus intermittent morphine administration after major surgery in 0-3-year-old infants; a double-blind randomized controlled trial

A randomized double-blind clinical trial compared the efficacy of 10 microg/kg/h morphine continuous intravenous infusion (CM) with that of 30 microg/kg morphine (IM) every 3h after major abdominal or thoracic surgery, in 181 infants aged 0-3 years. Efficacy was assessed by the caregiving nurses with the COMFORT 'behavior' and a visual analogue scale (VAS) for pain, every 3h in the first 24h after surgery. Random regression modeling was used to simultaneously estimate the effect of randomized group assignment, actual morphine dose (protocol dosage plus extra morphine when required), age category, surgical stress, and the time-varying covariate mechanical ventilation on COMFORT 'behavior' and the observational VAS rated pain, respectively. Overall, no statistical differences were found between CM and IM morphine administration in reducing postoperative pain. A significant interaction effect of condition with age category showed that the CM assignment was favorable for the oldest age category (1-3 years old). The greatest differences in pain response and actual morphine dose were between neonates and infants aged 1-6 months, with lower pain response in neonates who were on average satisfied with the protocol dosage of 10 microg/kg/h. Surgical stress and mechanical ventilation were not related to postoperative pain or morphine doses, leaving the inter-individual differences in pain response and morphine requirement largely unexplained.

Advances in fetal and neonatal surgery for gastrointestinal anomalies and disease

The last decade has seen considerable improvement in the understanding and treatment of neonatal surgical disorders. Translation of basic molecular biology research to clinical practice has directly improved the understanding and treatment of a number of congenital, developmental disorders, such as Hirschsprung's disease and congenital hyperinsulinism. Miniaturized instruments and improved optics have permitted increased use of videoscopic and minimally invasive techniques to even the smallest infants. Continued improvements in prenatal imaging will permit enhanced understanding of the prenatal natural history of congenital structural disorders and the development of more specific therapies. Finally, rigorous clinical research tools have begun to be applied to rare pediatric surgical disorders with the use of organized multicenter trials. It is an exciting time for all involved in the care of neonates.