First and second trimester maternal serum markers for prenatal aneuploidy screening: An update on the adjustment factors for race, smoking, and insulin dependent diabetes mellitus.

OBJECTIVES: The concentrations of maternal serum markers for aneuploidy screening are influenced by maternal characteristics such as race, smoking, insulin dependent diabetes mellitus (IDDM), and in vitro fertilization (IVF). Accurate risk estimation requires adjustment of initial values for these characteristics. This study aims to update and validate adjustment factors for race, smoking, and IDDM. METHODS: The study included singleton pregnancies that received multiple marker screening in Ontario, Canada between January 2012, and December 2018, and had their information collected in the Better Outcomes Registry & Network (BORN) Ontario. Serum markers assessed included first trimester pregnancy-associated plasma protein A (PAPP-A), free ß and total human chorionic gonadotropin (hCG), placental growth factor (PlGF) and αlpha-fetoprotein (AFP); second trimester AFP, unconjugated estriol (uE3), total hCG and inhibin A. The Mann-Whitney U test was used to assess the differences in the median multiple of the median (MoM) of serum markers between study and reference groups. New adjustment factors were generated by dividing the median MoM of a particular race, individuals who smoke tobacco, or have IDDM by those of the reference groups. RESULTS: The study included 624,789 pregnancies. There were statistically significant differences in serum marker concentrations among pregnant individuals who were Black, Asian, or First Nations compared to a White group, those who smoked compared to Non-smoking individuals, and those with IDDM compared to Non-IDDM group. New adjustment factors for race, smoking, and IDDM were validated by comparing median MoM of serum markers corrected using the current adjustment factors and new adjustment factors generated in this study. CONCLUSION: The adjustment factors generated in this study can adjust the effects of race, smoking, and IDDM on serum markers more accurately.

Qualitative evaluation of a guideline supporting shared decision making for extreme preterm birth.

Background and objectives: The decision to attempt resuscitation or provide palliative care at birth for extremely preterm infants between 22 and 25 weeks remains complex. The purpose of this study was to identify facilitators and barriers to implementation of a clinical practice guideline developed to support shared decision-making for these cases.Methods: A purposeful sample of healthcare providers, involved in the care of one of five cases of anticipated extremely preterm birth, was recruited for interviews. Participants shared their views on the guideline content, implementation process, and facilitators and barriers encountered. Interviews were audio-recorded and transcribed verbatim. Qualitative content analysis was used to code, categorize, and thematically describe the data. The Knowledge-Attitudes-Behaviours framework was used to organize the findings.Results: Twenty-five key informants (16 physicians, nine nurses) were interviewed. Participants described varying levels of knowledge of the guideline. Facilitators to implementation included: (1) an awareness of, familiarity with and belief in the content; (2) hard copy and electronic guideline accessibility; and, (3) institutional expertise to provide necessary care. Barriers included: (1) minimal awareness or familiarity with the content; (2) lack of agreement with the recommendations; (3) inadequate evidence and applicability to support changes in practice; and, (4) lack of resources to care for the most immature infants.Conclusions: Identified facilitators and barriers will inform the development of tailored strategies for improved local and future broader implementation. Other institutions can use the results to facilitate implementation of their guidelines on this ethically charged area.