PHLT 8062 Week 11 Literature Review Chapter Draft Example

Review Chapter Draft: What the Evidence Says, Link by Link, About Hepatitis B Birth Dose Coverage, Hospital Systems and Changes in Newborn Vaccine Supply, and Where It Stops

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Walden University

PHLT 8062: Dissertation Seminar II

Instructor Name

Month Day, Year

Review Chapter Draft: What the Evidence Says, Link by Link, About Hepatitis B Birth Dose Coverage, Hospital Systems and Changes in Newborn Vaccine Supply, and Where It Stops

Introduction and Scope

This chapter gathers what is known for a dissertation asking whether day-one hepatitis B vaccination changed at nine rural hospitals once they started purchasing newborn vaccine on their own. It is a structured narrative review supported by systematic searching, not a full systematic review: three databases were searched with a peer-reviewed strategy, gray literature was swept with documented methods, and inclusion decisions were made by two screeners, but the findings are synthesized in narrative form because the included studies differ too much in design and measurement to pool. Nineteen sources met the inclusion rules. The chapter is organized by the links of a chain adapted from the structure-process-outcome model of quality (Donabedian, 1988): vaccine supply, hospital systems, administration and recorded coverage. Each section opens with the claim the evidence addresses and then weighs the sources behind it.

The Recommended Practice

Under national guidance, every medically stable newborn of 2,000 grams or more should get hepatitis B vaccine within its first 24 hours, which protects babies whose mother's test result is missing, wrong or overlooked, and the same guidance names standing orders and admission order sets as the hospital systems that make the dose routine (Schillie et al., 2018). The guidance defines the process this review examines and serves as the standard against which coverage is judged.

Recorded Coverage: Below Later Doses, With Variation Suggested but Not Measured Directly

At the national level, the evidence is clear that the birth dose lags behind the remaining doses of the series, based on provider-verified records in a national survey (Hill et al., 2021). The survey cannot describe hospitals or rural regions, however, and no included source measured coverage across many hospitals with a common definition. Variation among hospitals is suggested by indirect evidence: a national survey found wide differences in hospitals' written prevention policies (Willis et al., 2010), and single-hospital reports describe coverage levels that differ from one another by margins of ten points or more. The claim that hospitals differ substantially is plausible and consistent across sources, but it has not been established directly, and comparisons across sources are complicated by different outcome windows: within 24 hours, before discharge and within three days.

A further caution applies to any registry-based measure. One state study found that some birth doses documented in hospital charts never reached the immunization registry, while a single-hospital improvement report saw charts and registry entries match closely. The difference likely reflects how each hospital transmits data, and it means that recorded coverage may understate administration at hospitals with manual reporting.

Hospital Systems: Consistently Associated With Higher Administration, on Weak Designs

The claim that standing orders and order sets raise birth dose administration is supported by every source that addresses it and contradicted by none. The national hospital survey links written policies with practice (Willis et al., 2010), and two improvement reports describe rises in administration after an order set or nurse-initiated standing order was introduced. The designs are weak, however. Both reports used before-and-after comparisons, one with a single comparison hospital and one without any, and neither analyzed monthly data to test whether coverage was already rising before the change. Neither said whether anything else changed during the same window. Such designs cannot separate an intervention's effect from preexisting trends or simultaneous events (Shadish et al., 2002). The evidence therefore supports hospital systems as a consistent correlate of higher administration, which is reason enough for the guidance's recommendation, but it does not quantify their effect.

Vaccine Supply: One Suggestive Evaluation, and Silence

The link the dissertation addresses has the thinnest evidence. Program reports from six states recounted the end or narrowing of state-supplied newborn vaccine and expressed concern about small hospitals, but none measured coverage before and after. One unpublished internal evaluation from a neighboring state looked at every birthing hospital's coverage across the two years before and the two years after such a change and reported a drop of roughly four percentage points at birthing units delivering under 500 babies annually, lasting roughly eighteen months, with no clear change at larger hospitals. That evaluation is the most relevant source in the review and also among the weakest by design: it lacked a comparison state, reported no confidence intervals, grouped hospitals into two size categories and relied on registry records alone. It suggests that a supply change may affect small hospitals temporarily; it does not establish it.

Factors Outside the Chain

Parental decisions act on the administration link, and one included hospital survey described reasons families declined the birth dose. Because the review's organizing chain treats refusal as one influence on administration rather than as its subject, this chapter says little about hesitancy; readers interested in that question will need other sources. Hospital staffing, which several program reports mentioned as a strain on small hospitals during the pandemic years, may also affect administration, but no included source measured it.

Where the Evidence Stops

Taken together, the sources establish that the birth dose is recommended, that national coverage falls short of later doses and that hospital systems are consistently associated with higher administration. Beyond that point, the evidence becomes thin or silent. It does not show, with a common measure across many hospitals, how much coverage varies among hospitals. It does not show whether changes in newborn vaccine supply affect coverage, apart from one unpublished evaluation in another state. And it says nothing about rural hospitals as a defined group, about whether any effect of a supply change persists beyond eighteen months, or about births missing from registries. Robinson et al. (2011) would classify these as gaps of insufficient information and of information collected in the wrong population; the dissertation is designed to address both for one rural region, using linked birth certificates and registry records to define eligible infants and measure their recorded doses before and after the supply change.

Limitations of This Review

The review searched three databases and selected gray sources; evaluations held internally by other states may have been missed, and the expert inquiry that found the neighboring state's evaluation reached only five people. Two screeners agreed well after the inclusion rules were revised, but appraisal was done by one person. The synthesis describes direction and strength in words rather than pooling results, which suits the heterogeneity of the sources but relies on judgment that another reviewer might exercise differently.

References

Donabedian, A. (1988). The quality of care: How can it be assessed? JAMA, 260(12), 1743-1748. https://doi.org/10.1001/jama.1988.03410120089033

Hill, H. A., Yankey, D., Elam-Evans, L. D., Singleton, J. A., & Sterrett, N. (2021). Vaccination coverage by age 24 months among children born in 2017 and 2018: National Immunization Survey-Child, United States, 2018-2020. MMWR Morbidity and Mortality Weekly Report, 70(41), 1435-1440. https://doi.org/10.15585/mmwr.mm7041a1

Robinson, K. A., Saldanha, I. J., & McKoy, N. A. (2011). Development of a framework to identify research gaps from systematic reviews. Journal of Clinical Epidemiology, 64(12), 1325-1330. https://doi.org/10.1016/j.jclinepi.2011.06.009

Schillie, S., Vellozzi, C., Reingold, A., Harris, A., Haber, P., Ward, J. W., & Nelson, N. P. (2018). Prevention of hepatitis B virus infection in the United States: Recommendations of the Advisory Committee on Immunization Practices. MMWR Recommendations and Reports, 67(1), 1-31. https://doi.org/10.15585/mmwr.rr6701a1

Shadish, W. R., Cook, T. D., & Campbell, D. T. (2002). Experimental and quasi-experimental designs for generalized causal inference. Houghton Mifflin.

Willis, B. C., Wortley, P., Wang, S. A., Jacques-Carroll, L., & Zhang, F. (2010). Gaps in hospital policies and practices to prevent perinatal transmission of hepatitis B virus. Pediatrics, 125(4), 704-711. https://doi.org/10.1542/peds.2009-1831