Lee Sutton

Does rural or urban residence make a difference to neonatal outcome in premature birth? A regional study in Australia

Background: Patients living in rural areas may be at a disadvantage in accessing tertiary health care. Aim: To test the hypothesis that very premature infants born to mothers residing in rural areas have poorer outcomes than those residing in urban areas in the state of New South Wales (NSW) and the Australian Capital Territory (ACT) despite a coordinated referral and transport system. Methods: “Rural” or “urban” status was based on the location of maternal residence. Perinatal characteristics, major morbidity and case mix adjusted mortality were compared between 1879 rural and 6775 urban infants <32 weeks gestational age, born in 1992–2002 and admitted to all 10 neonatal intensive care units in NSW and ACT. Results: Rural mothers were more likely to be teenaged, indigenous, and to have had a previous premature birth, prolonged ruptured membrane, and antenatal corticosteroid. Urban mothers were more likely to have had assisted conception and a caesarean section. More urban (93% v 83%) infants were born in a tertiary obstetric hospital. Infants of rural residence had a higher mortality (adjusted odds ratio (OR) 1.26, 95% confidence interval (CI) 1.07 to 1.48, p  =  0.005). This trend was consistently seen in all subgroups and significantly for the tertiary hospital born population and the 30–31 weeks gestation subgroup. Regional birth data in this gestational age range also showed a higher stillbirth rate among rural infants (OR 1.20, 95% CI 1.09 to 1.32, p<0.001). Conclusions: Premature births from rural mothers have a higher risk of stillbirth and mortality in neonatal intensive care than urban infants.

Preterm outcome table (POT): a simple tool to aid counselling parents of very preterm infants.

Background:  Outcome figures published in scientific journals are often cumbersome and difficult to understand by parents during counselling before or immediately after a very premature birth.

Neurodevelopmental Outcomes of Premature Infants Treated for Patent Ductus Arteriosus: A Population-Based Cohort Study.

OBJECTIVE To compare neurodevelopmental outcomes of extremely preterm infants diagnosed with patent ductus arteriosus (PDA) who were treated medically or surgically and those who were not diagnosed with PDA or who did not undergo treatment for PDA. STUDY DESIGN This retrospective population-based cohort study used data from a geographically defined area in New South Wales and the Australian Capital Territory served by a network of 10 neonatal intensive care units. Patients included all preterm infants born at <29 completed weeks of gestation between 1998 and 2004. Moderate/severe functional disability at 2-3 years corrected age was defined as developmental delay, cerebral palsy requiring aids, sensorineural or conductive deafness (requiring bilateral hearing aids or cochlear implant), or bilateral blindness (best visual acuity of <6/60). RESULTS Follow-up information at age 2-3 years was available for 1473 infants (74.8%). Compared with infants not diagnosed with a PDA or who did not receive PDA treatment for PDA, those with medically treated PDA (aOR, 1.622; 95% CI, 1.199-2.196) and those with surgically treated PDA (aOR, 2.001; 95% CI, 1.126-3.556) were at significantly greater risk for adverse neurodevelopmental outcomes at age 2-3 years. CONCLUSION Our results demonstrate that treatment for PDA may be associated with a greater risk of adverse neurodevelopmental outcome at age 2-3 years. This was particularly so among infants born at <25 weeks gestation. These results may support permissive tolerance of PDAs; however, reasons for this association remain to be elucidated through carefully designed prospective trials.

Do very sick neonates born at term have antenatal risks

Aims. 1. Ascertain antenatal and intrapartum risk factors for term neonates ventilated primarily for respiratory problems. 2. Describe the neonatal morbidity and mortality.

Score of neonatal acute physiology as a measure of illness severity in mechanically ventilated term babies.

The objectives of this population‐based, case‐control cohort study were to describe the use of the score of neonatal acute physiology (SNAP) as a measure of illness severity in mechanically ventilated term infants, to compare the SNAP scores of the different diagnostic groups, to assess the contribution of the individual SNAP items to the overall SNAP severity category, and to assess SNAP as a predictor of mortality and neonatal intensive care unit (NICU) resource utilization (length of stay (LOS) and duration of ventilation (LOV)). The study was carried out in Sydney and four large rural/urban health areas in New South Wales, Australia. The subjects—182 singleton term infants with no major congenital anomalies—were admitted to a tertiary NICU for mechanical ventilation. Highest mean (SD) SNAP scores occurred in infants ventilated for meconium aspiration (18 (9)), and perinatal asphyxia (17 (9)), compared with pulmonary hypertension (14 (6)) and respiratory distress syndrome (13 (5)). The individual SNAP items that contributed most to SNAP moderate and severe categories were blood gas items, creatinine, urine output, blood glucose, and seizures. Predictors of death included total SNAP score, individual SNAP items (urine output, pH, Oxygenation Index (OI)), 5‐min Apgar, gestational age >40 wk, growth restriction, and ventilation for asphyxia/apnoea. SNAP alone was not a good predictor of NICU resource utilization (LOS, LOV) in term infants. The best predictors were LOV for LOS, and a combination of SNAP and the reason for ventilation for LOV.

Postmortem examinations in a statewide audit of neonatal intensive care unit admissions in Australia in 1992

The objectives of the investigation were (i) to study infants registered in a statewide audit of tertiary neonatal intensive care units in New South Wales, Australia in 1992 and who died, and (ii) to examine postmortem rates, quality of postmortem reports and compare clinical cause of death with postmortem report. Death rates, data on clinical cause of death and postmortem status were collected prospectively as part of the routine audit. Postmortem reports were examined by LS. Fifteen percent of the cohort died and 43% had a postmortem examination. The postmortem rate was highest in the 28‐36 week gestation group and in babies dying of pulmonary haemorrhage, intracranial haemorrhage or sudden infant death syndrome. Fewer than 50% of babies with a major congenital anomaly had a postmortem. The postmortem changed the major diagnosis in 10% of cases and added useful information in 17%. We conclude that postmortem examination should be an essential part of any audit of neonatal intensive care unit outcomes.

Do very sick neonates born at term have antenatal risks? 1. Infants ventilated primarily for problems of adaptation to extra-uterine life.

Aims. 1. Ascertain antenatal and intrapartum risk factors for term neonates ventilated primarily for ‘perinatal asphyxia’. 2. Describe the neonatal morbidity and mortality.

Widespread use of gastric acid inhibitors in infants: Are they needed? Are they safe?

Gastroesophageal reflux is a common phenomenon in infants, but the differentiation between gastroesophageal reflux and gastroesophageal reflux disease can be difficult. Symptoms are non-specific and there is increasing evidence that the majority of symptoms may not be acid-related. Despite this, gastric acid inhibitors such as proton pump inhibitors are widely and increasingly used, often without objective evidence or investigations to guide treatment. Several studies have shown that these medications are ineffective at treating symptoms associated with reflux in the absence of endoscopically proven oesophagitis. With a lack of evidence for efficacy, attention is now being turned to the potential risks of gastric acid suppression. Previously assumed safety of these medications is being challenged with evidence of potential side effects including GI and respiratory infections, bacterial overgrowth, adverse bone health, food allergy and drug interactions.

Part 9: Risk-adjusted caesarean section rates in NSW hospitals

This chapter presents the results of a study that produced risk-adjusted rates of caesarean section for NSW hospitals, using information on clinical risk factors currently collected through the NSW Midwives Data Collection (MDC).

Part 1: Trends in New South Wales

The number of births per year has remained fairly stable over the past 5 years (Table 1). There were 86,305 births to 85,072 women reported to the MDC for 1998. Of the 85,072 confinements reported in 1998, 1,174 (1.4 per cent) were for twins, 28 for triplets and one for quadruplets.