Gamma-type immunoglobulin enhances phagocytosis of amyloid-beta fibrils by microglia.

Infant hearing loss occurs at an incidence of 1.4 per 1000 births and children born with hearing loss are at a significant risk of language development delays. The identification, management, and reporting of infant hearing loss are public health issues overseen by the Centers for Disease Control (CDC) and coordinated by state Early Infant Hearing Detection and Intervention (EHDI) programs. To prevent delays in diagnosis/intervention, universal infant hearing screening standards and programs were developed and piloted during the 1990’s. These standards were subsequently implemented throughout the United States as a results of the position statements and policy recommendations by the United States Preventive Services Task Force, Joint Committee on Infant Hearing (JCIH), and the National Institutes of Health in 1999–2000. Through their joint efforts, these agencies created the EHDI guidelines, also known as the 1–3-6 guidelines, which recommends the following: all infants should have hearing screening after birth no later than one month of age, infants with abnormal screening results should have definitive diagnostic hearing testing no later than three months of age, and infants who are found to have hearing loss should receive early intervention services no later than six months of age. According to the CDC, EDHI programs exist in all 50 states and 97% of infants in the US undergo hearing screening; however, nearly 30% of infants with hearing loss are delayed in diagnosis and approximately 30% of infants with hearing loss do not receive early intervention care. Lack of adherence to the 1–3-6 guidelines and poor utilization of EHDI services are high priority areas for the JCIH. EHDI programs require significant coordination and cost; thus, it is important to determine whether adherence to the 1–3-6 guidelines has any effect on speech development. The purpose of this article is to assess the literature regarding the impact of adherence to 1–3-6 EHDI guidelines on pediatric spoken language outcomes. The JCIH position statements are based on research that link earlier diagnosis/intervention with overall language development; however, those studies did not assess the impact of being adherent to all three components of the EHDI 1–3-6 guidelines. The National Early Childhood Assessment Project (NECAP) which is a multistate program supported by the CDC to evaluate the outcomes of children with hearing loss and the impact of 1–3-6 EHDI recommendations. A cross-sectional study NECAP study from 2017 investigated 448 children who failed newborn hearing screening and were subsequently diagnosed with hearing loss across 12 states ranging in age from 8–39 months. This study assessed whether meeting all 3 components of the 1–3-6 EHDI timepoints influences expressive vocabulary, as expressed by a vocabulary quotient (VQ). Using multivariate linear regression, the authors found that children who here adherent to the EHDI guideline timepoints had significantly higher VQ values than those children who did not. Those children who met only one of the timepoints (either 3-month age for diagnosis or 6-month age for intervention) but not both had significantly lower VQ values than those who were adherent to all EHDI time points. Other significant independent variables influencing vocabulary development included age, presence of a disability, deaf or hard of hearing parent(s), maternal level of education, and degree of hearing loss. Nearly 90% of all children in this study were utilizing hearing aids, osseointegrated implant, or cochlear implants (CI). This particular study did not specifically assess the age at implantation, duration of CI use, or the effect of implantation timing on language outcomes. In spite of timely diagnosis and intervention, those children with hearing loss who met the EHDI timepoints had significantly lower expressive vocabulary than expected vocabulary for children with normal hearing (VQ of 82 versus 100). This indicates that other factors are at play, beyond the scope of this particular study, in pediatric language develop. This study was limited in that language development that was assessed was only expressive language and data collection was performed by a variety of different individuals (interventionists and parents) across 12 different states.