Major birth defects in very low birth weight infants in the Vermont Oxford Network

OBJECTIVE

To study the frequency and types of major birth defects in very low birth weight (VLBW) infants and their impact on mortality and resource use.

STUDY DESIGN

Analysis of data from the Vermont Oxford Network Database from 1994 and 1995 on infants with birth weights of 501 to 1500 g. Major birth defects were reported from a list of 40 defined major defects or if they were considered lethal or life-threatening. Mortality and length of stay were determined.

RESULTS

Major birth defects were present in 823 (4.3%) of 19,228 VLBW infants from 147 hospitals. The most common categories were chromosomal anomalies (20%); named syndromes, sequences, and associations (19%); and gastrointestinal (14%), cardiovascular (11%), and nervous system (10%) anomalies. Infants with major birth defects had a higher mortality rate (58% vs 13%, P <.001) and a higher rate of major surgery (29% vs 5%, P <.001) than infants without such defects. Infants with major birth defects accounted for 16.3% of deaths and 18.9% of major surgical procedures but only for 2.9% of total hospital days.

CONCLUSIONS

Major birth defects accounted for 16% of all deaths in VLBW infants. However, they accounted for a low proportion of total hospital days.

Collaborative quality improvement for neonatal intensive care. NIC/Q Project Investigators of the Vermont Oxford Network

OBJECTIVE

To make measurable improvements in the quality and cost of neonatal intensive care using a multidisciplinary collaborative quality improvement model.

DESIGN

Interventional study. Patient demographic and clinical information for infants with birth weight 501 to 1500 g was collected using the Vermont Oxford Network Database for January 1, 1994 to December 31, 1997.

SETTING

Ten self-selected neonatal intensive care units (NICUs) received the intervention. They formed 2 subgroups (6 NICUs working on infection, 4 NICUs working on chronic lung disease). Sixty-six other NICUs served as a contemporaneous comparison group.

PATIENTS

Infants with birth weight 501 to 1500 g born at or admitted within 28 days of birth between 1994 and 1997 to the 6 study NICUs in the infection group (n = 3063) and the 66 comparison NICUs (n = 21 509); infants with birth weight 501 to 1000 g at the 4 study NICUs in the chronic lung disease group (n = 738).

INTERVENTIONS

NICUs formed multidisciplinary teams that worked together under the direction of a trained facilitator over a 3-year period beginning in January 1995. They received instruction in quality improvement, reviewed performance data, identified common improvement goals, and implemented "potentially better practices" developed through analysis of the processes of care, literature review, and site visits.

MAIN OUTCOME MEASURES

The rates of infection after the third day of life with coagulase-negative staphylococcal or other bacterial pathogens for infants with birth weight 501 to 1500 g, and the rates of oxygen supplementation or death at 36 weeks' adjusted gestational age for infants with birth weight 501 to 1000 g.

RESULTS

Between 1994 and 1996, the rate of infection with coagulase-negative staphylococcus decreased from 22.0% to 16.6% at the 6 project NICUs in the infection group; the rate of supplemental oxygen at 36 weeks' adjusted gestational age decreased from 43.5% to 31.5% at the 4 NICUs in the chronic lung disease group. There was heterogeneity in the effects among the NICUs in both project groups. The changes observed at the project NICUs for these outcomes were significantly larger than those observed at the 66 comparison NICUs over the 4-year period from 1994 to 1997.

CONCLUSION

We conclude that multidisciplinary collaborative quality improvement has the potential to improve the outcomes of neonatal intensive care.

Ellipsometric determination of universal critical adsorption scaling functions

In this paper we determine and compare a number of theoretical models which describe the universal scaling functions for critical adsorption in the strong surface field limit. The P1 and P3 models, which are continuous up to and including the first and third derivatives, respectively, provide excellent descriptions of the ellipsometric data for four different critical binary liquid mixtures. The exponential-Pade model, initially proposed by Liu and Fisher [Phys. Rev. A 40, 7202 (1989)], provides a reasonable but less accurate description of the one-phase experimental data. This later model has the advantage, however, that it is continuous in all derivatives.

Cardiopulmonary resuscitation in the very low birth weight infant: the Vermont Oxford Network experience

OBJECTIVE

The limited literature available to date suggests that the use of delivery room cardiopulmonary resuscitation (DR-CPR) is associated with very poor outcomes, especially for extremely low birth weight infants. We reviewed the cumulative experience of the Vermont Oxford Network to determine the actual utilization of DR-CPR and the neonatal outcomes of such infants.

METHODS

A retrospective review of information available in the Vermont Oxford Network Database for the years 1994 to 1996. The data set was collected from 196 neonatal units who participate in the Network (data for infants 401 to 500 g were from 1996 only). Infants were eligible for study if they received DR-CPR defined as the administration of chest compressions and/or epinephrine in the delivery room as noted on the Vermont Oxford Network Database record.

RESULTS

Information regarding survival was available for 27 707 newborns with birth weights from 501 to 1500 g, and 497 infants with birth weights from 401 to 500 g. There were 24 001 (86.6%) survivors. Overall DR-CPR was given to 9.3% of infants from 401 to 500 g and 6% of infants from 501 to 1500 g, 82.1% receiving chest compressions, and 66.7% receiving epinephrine. Survival of infants receiving DR-CPR was 23. 9% for infants of 401 to 500 g, and 63.3% for infants of 501 to 1500 g, compared with 16.7% and 87.9% for infants in these weight groups not receiving DR-CPR. Survival was greater for infants of 501 g or greater without DR-CPR compared with those who received this intervention within each 250-g birth weight subgroup. For infants of <1000 g, survival was 53.8% with DR-CPR compared with 74.9% without. Head ultrasounds were available for 95.5% of all surviving infants and 96.7% of infants who received DR-CPR. Overall, any grade of intraventricular hemorrhage (IVH) occurred more frequently in infants who received DR-CPR (38%) than in those who did not (21%). Grade 3 or 4 (severe) IVH was seen in 15.3% of infants who received DR-CPR compared with 4.9% of the infants who did not. Overall, survival without severe IVH occurred in 52.2% of DR-CPR infants compared with 81.3% of infants who did not require this intervention.

CONCLUSION

The majority of very low birth weight and extremely low birth weight infants who receive DR-CPR survive, and at least half of such infants who survive do not have evidence of severe IVH. Further follow-up studies are required to determine the long-term neurodevelopmental outcome of such infants. The current study does not support the previously noted poor outcome in extremely low birth weight infants who receive DR-CPR.

Universal surface scaling function for critical adsorption

We present an accurate determination of the one- and two-phase universal surface scaling function which describes critical adsorption at noncritical interfaces of critical binary liquid mixtures in the strong surface field limit. The 95% confidence levels for this function are also determined. This function quantitatively describes ellipsometric critical adsorption data for three upper critical and one lower critical binary liquid mixtures.

Long-term responses of higher and lower risk youths to smoking prevention interventions

BACKGROUND

Adolescents at risk for cigarette smoking are difficult to reach with conventional interventions but have substantial exposure to the mass media. This study is the first to show that smoking prevention messages presented through the mass media can have large and durable effects on higher risk adolescents.

METHODS

Students in two communities received media and school interventions beginning in grades 5-7; those in matched comparison communities received school interventions. Media interventions were targeted to higher risk youths. School surveys were conducted before and after the interventions, in grades 4-6 and grades 8-10. Two years after interventions ended, when participants were in grades 10-12, school and telephone surveys were conducted to assess smoking status. Survey participants (n = 2,860) were classified at baseline as having higher or lower risk for becoming a smoker.

RESULTS

Smoking prevalence within the higher risk sample was significantly lower for those receiving media-school interventions than for those receiving school interventions only (odds ratio = 0.71). Effects on the lower risk sample were similar in magnitude but marginally significant.

CONCLUSIONS

Mass media and school interventions achieved lower smoking rates among higher risk youngsters 2 years following completion of the interventions. This strategy represents a uniquely effective method for communicating with a high-priority group.

Using mass media to prevent cigarette smoking among adolescent girls

This article describes the development of a mass media smoking prevention intervention targeted primarily toward adolescent girls at increased risk for smoking and assesses its outcomes. A cohort of 5,458 students was surveyed at baseline in Grades 4-6 and annually for 4 years. Through diagnostic and formative research, media messages were created to appeal especially to girls. Students beginning in Grades 5-7 received the 4-year media intervention and a school program in two communities, while students in two matched communities received the school program alone. Media targeting techniques resulted in high levels of message appeal and exposure consistent with effects on mediating variables and 40% lower weekly smoking at Grades 8-10 for girls receiving the media and school interventions compared to school alone. Smoking behavior effects were maintained at Grades 10-12. These results indicate that mass media interventions targeting specific audience segments can reduce substance use behavior for those segments.

Mass media and school interventions for cigarette smoking prevention: effects 2 years after completion

The long-term cigarette smoking prevention effects of mass media and school interventions were assessed. Adolescents in two communities received both mass media and school interventions; those in two matching communities received only school interventions. Surveys of 5458 students were conducted at baseline in grades 4 through 6 and 2 years after the 4-year interventions were completed, when students were in grades 10 through 12. Students exposed to the media-plus-school interventions were found to be at lower risk for weekly smoking (odds ratio = 0.62, 95% confidence interval = 0.49, 0.78) than those receiving school interventions only, indicating that the effects of the combined interventions persisted 2 years after the interventions' completion.

Differences in human serum copper and zinc levels in healthy and patient populations

This report is designed to re-examine the use of our presently accepted normal laboratory levels for human serum zinc and copper and to suggest a technique, previously unreported in the literature, to more precisely understand the relationship of serum zinc and copper in health and disease. Data from a patient population of 95 and a healthy population of 115 who met certain criteria are compared.

Sunlight-Induced Bromate Formation in Chlorinated Seawater

Chlorinated waters are being introduced into estuarine and coastal areas in increasing quantities. In such systems, the chlorine reacts with the natural bromide and ammonia to produce the highly toxic hypobromous acid, hypobromite ion, and haloamines. Sunlight causes up to 50 percent conversion to bromate ion, which is persistent in natural waters and has an unknown toxicity.