Effects of Single Low-Carbohydrate, High-Fat Meal Consumption on Postprandial Lipemia and Markers of Endothelial Dysfunction: A Systematic Review of Current Evidence.

CONTEXT: Postprandial lipemia (PPL) is associated with increased risk of endothelial dysfunction (ED), a precursor of atherosclerotic cardiovascular disease (ASCVD). The effects of low-carbohydrate, high-fat (LCHF) diets on ASCVD risk are uncertain; therefore, gaining a greater understanding of LCHF meals on PPL may provide valuable insights. OBJECTIVE: The current systematic review investigated the effects of single LCHF meal consumption on PPL and markers of ED. DATA SOURCES: CINAHL Plus, PubMed, Web of Science, and Cochrane Central Register of Controlled Trials (CENTRAL) were searched for key terms related to endothelial function, cardiovascular disease, glycemia, lipemia, and the postprandial state with no restriction on date. DATA EXTRACTION: Full-text articles were independently screened by 2 reviewers, of which 16 studies were eligible to be included in the current review. All trials reported a minimum analysis of postprandial triglycerides (PPTG) following consumption of an LCHF meal (<26% of energy as carbohydrate). Results were reported according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. DATA ANALYSIS: Single-meal macronutrient composition was found to play a key role in determining postprandial lipid and lipoprotein responses up to 8 hours post-meal. Consumption of LCHF meals increased PPTG and may contribute to ED via reduced flow-mediated dilation and increased oxidative stress; however, energy and macronutrient composition varied considerably between studies. CONCLUSION: Consumption of an LCHF meal had a negative impact on PPL based on some, but not all, single-meal studies; therefore, the contribution of LCHF meals to cardiometabolic health outcomes remains unclear. Further research is needed on specific categories of LCHF diets to establish a causal relationship between postprandial modulation of lipids/lipoproteins and impaired vascular endothelial function. SYSTEMATIC REVIEW REGISTRATION: PROSPERO registration no. CRD 42023398774.

Identification of diagnostic biomarkers used in the diagnosis of cardiovascular diseases and diabetes mellitus: A systematic review of quantitative studies.

AIMS: To perform a systematic review of studies that sought to identify diagnostic biomarkers for the diagnosis of cardiovascular diseases (CVDs) and diabetes mellitus (DM), which could be used in low- and middle-income countries (LMICs) where there is a lack of diagnostic equipment, treatments and training. MATERIALS AND METHODS: Papers were sourced from six databases: the British Nursing Index, Google Scholar, PubMed, Sage, Science Direct and Scopus. Articles published between January 2002 and January 2023 were systematically reviewed by three reviewers and appropriate search terms and inclusion/exclusion criteria were applied. RESULTS: A total of 18 studies were yielded, as well as 234 diagnostic biomarkers (74 for CVD and 160 for DM). Primary biomarkers for the diagnosis of CVDs included growth differentiation factor 15 and neurogenic locus notch homologue protein 1 (Notch1). For the diagnosis of DM, alpha-2-macroglobulin, C-peptides, isoleucine, glucose, tyrosine, linoleic acid and valine were frequently reported across the included studies. Advanced analytical techniques, such as liquid chromatography mass spectrometry, enzyme-linked immunosorbent assays and vibrational spectroscopy, were also repeatedly reported in the included studies and were utilized in combination with traditional and alternative matrices such as fingernails, hair and saliva. CONCLUSIONS: While advanced analytical techniques are expensive, laboratories in LMICs should carry out a cost-benefit analysis of their use. Alternatively, laboratories may want to explore emerging techniques such as infrared, Fourier transform-infrared and near-infrared spectroscopy, which allow sensitive noninvasive analysis.

Reproductive Planning: Long-Acting Reversible Contraceptives and Emergency Contraception.

Long-acting reversible contraceptives (LARCs) include progestin and copper intrauterine devices (IUDs) and progestin subdermal implants. LARCs may be the preferred for individuals who want a method that is highly effective and can last for several years, or for whom estrogen is contraindicated. LARCs should be offered using a shared decision-making approach, keeping in mind that historically these methods have been used coercively to control the reproductive choices of marginalized or disabled people. To ensure safe prescribing and reduce barriers to receiving LARCs, family physicians should be familiar with two evidence-based national contraceptive guidelines: the U.S. Medical Eligibility Criteria for Contraceptive Use (U.S. MEC) and the U.S. Selected Practice Recommendations for Contraceptive Use (U.S. SPR). Information about insertion, removal, potential complications, and expected adverse effects should be included when counseling patients about LARC options. Both types of LARC IUDs can safely be used for emergency contraception if inserted within 5 days of unprotected intercourse. Several oral emergency contraception drug options also are available.

Reproductive Planning: Unintended Pregnancy.

Unintended pregnancy is seen commonly in the family medicine setting. It is defined as a pregnancy that is mistimed (occurring sooner than wanted) or unwanted (not desired at that time or any time in the future). Approximately 45% of all US pregnancies are unintended. Childbirth resulting from an undesired pregnancy has been associated with adverse maternal and child health outcomes. Clinicians should be prepared to manage unplanned pregnancies, including dating pregnancies and discussing pregnancy options. Pregnancy options counseling entails discussing the options to parent, make an adoption plan, or undergo an abortion. Because of the complexity around pregnancy intentions, a framework that places patients at the center of their reproductive decisions and engages them in collaborative decision-making during options counseling is paramount. Patients commonly seek abortion, which is considered essential health care. Because of the current legal climate surrounding abortion in many states, patients may opt to use abortion drugs without licensed clinician oversight, called self-managed medication abortion, which has been shown to be safe and effective. No states require clinicians to report known or suspected self-managed medication abortion.

Reproductive Planning: Contraceptive Counseling and Nonhormonal Methods.

More than 65% of US women ages 15 to 49 years use contraception every year, many of whom seek care with family medicine. Family physicians are well equipped to provide comprehensive contraceptive counseling to patients in the primary care setting. When discussing options and providing education to patients, clinicians should consider patient preferences, patient autonomy, and adverse effect concerns, and should use a patient-centered approach that upholds the principles of reproductive justice. Nonhormonal methods of contraception include barrier methods and spermicides, fertility awareness-based methods, and (in postpartum individuals) lactational amenorrhea. With barrier methods, spermicides, and fertility awareness-based methods, 13 to 29 out of 100 women may become pregnant. Permanent forms of contraception include female and male sterilization procedures, which are some of the most effective (more than 99% effective) and most commonly used methods in the United States.

Reproductive Planning: Short-Acting Reversible Contraceptives.

Short-acting reversible contraceptives (SARCs) are prescribed routinely by primary care clinicians. SARCs are among the most commonly prescribed contraceptive methods and include combined hormonal oral contraceptive pills, the combined hormonal transdermal patch, the combined hormonal vaginal ring, progestin-only pills, and the 3-month depot medroxyprogesterone acetate injection. To ensure safe prescribing and reduce barriers to receiving SARC methods, family physicians should be familiar with two evidence-based national contraceptive guidelines, the U.S. Medical Eligibility Criteria for Contraceptive Use (U.S. MEC) and the U.S. Selected Practice Recommendations for Contraceptive Use (U.S. SPR). SARCs have benefits in addition to pregnancy prevention; as such, these methods may be chosen for reasons other than contraception.

Gender Bias in Diagnosis, Prevention, and Treatment of Cardiovascular Diseases: A Systematic Review.

Cardiovascular disease (CVDs) has been perceived as a 'man's disease', and this impacted women's referral to CVD diagnosis and treatment. This study systematically reviewed the evidence regarding gender bias in the diagnosis, prevention, and treatment of CVDs. Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines were followed. We searched CINAHL, PubMed, Medline, Web of Science, British Nursing Index, Scopus, and Google Scholar. The included studies were assessed for quality using risk bias tools. Data extracted from the included studies were exported into Statistical Product and Service Solutions (SPSS, v26; IBM SPSS Statistics for Windows, Armonk, NY), where descriptive statistics were applied. A total of 19 studies were analysed. CVDs were less reported among women who either showed milder symptoms than men or had their symptoms misdiagnosed as gastrointestinal or anxiety-related symptoms. Hence, women had their risk factors under-considered by physicians (especially by male physicians). Subsequently, women were offered fewer diagnostic tests, such as coronary angiography, ergometry, electrocardiogram (ECG), and cardiac enzymes, and were referred to less to cardiologists and/or hospitalisation. Furthermore, if hospitalised, women were less likely to receive a coronary intervention. Similarly, women were prescribed cardiovascular medicines than men, with the exception of antihypertensive and anti-anginal medicines. When it comes to the perception of CVD, women considered themselves at lower risk of CVDs than men. This systematic review showed that women were offered fewer diagnostic tests for CVDs and medicines than men and that in turn influenced their disease outcomes. This could be attributed to the inadequate knowledge regarding the differences in manifestations among both genders.

Genome-wide analysis of early vascular tunic repair and regeneration for Botrylloides digenesis reveals striking similarities to human wound healing.

The early stages of regeneration after injury are similar to those of wound healing. The ascidian Botrylloides diegensis can regenerate an entire adult from a small fragment of vascular tunic following the removal of all zooids in an injury-induced regeneration model. We investigated the molecular and cellular changes following injury to determine the differences between the healing process and the initiation of whole-body regeneration (WBR). We conducted transcriptome analysis at specific time points during regeneration and wound healing to identify differentially expressed genes (DEGs) and the unique biological processes associated with each state. Our findings revealed 296 DEGs at 10 h post-injury (hpi), with 71 highly expressed in healed tissue and 225 expressed during the WBR process. These DEGs were predicted to play roles in tissue reorganization, integrin signaling, extracellular matrix organization, and the innate immune system. Pathway analysis of the upregulated genes in the healed tunic indicated functional enrichment related to tissue repair, as has been observed in other species. Additionally, we examined the cell types in the tunic and ampullae in both tissue states using histology and in situ hybridization for six genes identified by transcriptome analysis. We observed strong mRNA expression in cells within the WBR tunic, and in small RNA-positive granules near the tunic edge. We hypothesized that many of these genes function in the compaction of the ampullae tunic, which is a pivotal process for WBR and dormancy in B. diegensis, and in an immune response. These findings establish surprising similarities between ascidian regeneration and human wound healing, emphasizing the potential for future investigations into human regenerative and repair mechanisms. This study provides valuable insights into the gene sets specifically activated during regeneration compared to wound healing, shedding light on the divergent activities of these processes.

Deletion of a conserved genomic region associated with adolescent idiopathic scoliosis leads to vertebral rotation in mice.

Adolescent idiopathic scoliosis (AIS) is the most common form of scoliosis, in which spinal curvature develops in adolescence, and 90% of patients are female. Scoliosis is a debilitating disease that often requires bracing or surgery in severe cases. AIS affects 2%-5.2% of the population; however, the biological origin of the disease remains poorly understood. In this study, we aimed to determine the function of a highly conserved genomic region previously linked to AIS using a mouse model generated by CRISPR-CAS9 gene editing to knockout this area of the genome to understand better its contribution to AIS, which we named AIS_CRMΔ. We also investigated the upstream factors that regulate the activity of this enhancer in vivo, whether the spatial expression of the LBX1 protein would change with the loss of AIS-CRM function, and whether any phenotype would arise after deletion of this region. We found a significant increase in mRNA expression in the developing neural tube at E10.5, and E12.5, for not only Lbx1 but also other neighboring genes. Adult knockout mice showed vertebral rotation and proprioceptive deficits, also observed in human AIS patients. In conclusion, our study sheds light on the elusive biological origins of AIS, by targeting and investigating a highly conserved genomic region linked to AIS in humans. These findings provide valuable insights into the function of the investigated region and contribute to our understanding of the underlying causes of this debilitating disease.

Identification of novel microRNAs in the embryonic mouse brain using deep sequencing.

Many advances in small RNA-seq technology and bioinformatics pipelines have been made recently, permitting the discovery of novel miRNAs in the embryonic day 15.5 (E15.5) mouse brain. We aimed to improve miRNA discovery in this tissue to expand our knowledge of the regulatory networks that underpin normal neurodevelopment, find new candidates for neurodevelopmental disorder aetiology, and deepen our understanding of non-coding RNA evolution. A high-quality small RNA-seq dataset of 458 M reads was generated. An unbiased miRNA discovery pipeline identified fifty putative novel miRNAs, six of which were selected for further validation. A combination of conservation analysis and target functional prediction was used to determine the authenticity of novel miRNA candidates. These findings demonstrate that miRNAs remain to be discovered, particularly if they have the features of other small RNA species.

Adolescent Sport-Related Concussion and the Associated Neurophysiological Changes: A Systematic Review.

BACKGROUND: Sport-related concussion (SRC) has been shown to induce cerebral neurophysiological deficits, quantifiable with electroencephalography (EEG). As the adolescent brain is undergoing rapid neurodevelopment, it is fundamental to understand both the short- and long-term ramifications SRC may have on neuronal functioning. The current systematic review sought to amalgamate the literature regarding both acute/subacute (≤28 days) and chronic (>28 days) effects of SRC in adolescents via EEG and the diagnostic accuracy of this tool. METHODS: The review was registered within the Prospero database (CRD42021275256). Search strategies were created and input into the PubMed database, where three authors completed all screening. Risk of bias assessments were completed using the Scottish Intercollegiate Guideline Network and Methodological Index for Non-Randomized Studies. RESULTS: A total of 128 articles were identified; however, only seven satisfied all inclusion criteria. The studies ranged from 2012 to 2021 and included sample sizes of 21 to 81 participants, albeit only ∼14% of the included athletes were females. The studies displayed low-to-high levels of bias due to the small sample sizes and preliminary nature of most investigations. Although heterogeneous methods, tasks, and analytical techniques were used, 86% of the studies found differences compared with control athletes, in both the symptomatic and asymptomatic phases of SRC. One study used raw EEG data as a diagnostic indicator demonstrating promise; however, more research and standardization are a necessity. CONCLUSIONS: Collectively, the findings highlight the utility of EEG in assessing adolescent SRC; however, future studies should consider important covariates including biological sex, maturation status, and development.

In vitro effects of wool-derived keratin on human dental pulp-derived stem cells for endodontic applications.

In this study we examine the influence of wool-derived keratin intermediate filament proteins (kIFPs) on human dental pulp-derived stem cells (hDPSCs). kIFPs were diluted (10 mg/mL to 0.001 mg/mL) in cell culture media. Effects on hDPSCs proliferation were measured using Alamar blue assay. Keratin concentrations of 1 mg/mL and 0.1 mg/mL were tested for odontogenic differentiation and mineralisation. Alkaline phosphatase (ALP) quantification (7th, 14th, and 21st days), alizarin red S (AR-S) staining and calcium quantification (21st day), reverse transcription polymerase chain reaction (RT-PCR, collagen expression), and immunocytochemical staining for dentin matrix protein (DMP) were performed. hDPSCs showed higher proliferation with kIFPs of 0.1 mg/mL or less (p < 0.0001). The 0.1 mg/mL keratin concentration promoted odontogenic differentiation, confirmed by increased ALP activity, significant calcium deposits (AR-S staining, p < 0.05), up-regulated collagen expression (RT-PCR, p < 0.05), and positive DMP staining. These results suggest that kIFPs could be a potential biomaterial for pulp-dentin regeneration.

Sex-biased gene and microRNA expression in the developing mouse brain is associated with neurodevelopmental functions and neurological phenotypes.

BACKGROUND: Sex differences pose a challenge and an opportunity in biomedical research. Understanding how sex chromosomes and hormones affect disease-causing mechanisms will shed light on the mechanisms underlying predominantly idiopathic sex-biased neurodevelopmental disorders such as ADHD, schizophrenia, and autism. Gene expression is a crucial conduit for the influence of sex on developmental processes; therefore, this study focused on sex differences in gene expression and the regulation of gene expression. The increasing interest in microRNAs (miRNAs), small, non-coding RNAs, for their contribution to normal and pathological neurodevelopment prompted us to test how miRNA expression differs between the sexes in the developing brain. METHODS: High-throughput sequencing approaches were used to identify transcripts, including miRNAs, that showed significantly different expression between male and female brains on day 15.5 of development (E15.5). RESULTS: Robust sex differences were identified for some genes and miRNAs, confirming the influence of biological sex on RNA. Many miRNAs that exhibit the greatest differences between males and females have established roles in neurodevelopment, implying that sex-biased expression may drive sex differences in developmental processes. In addition to highlighting sex differences for individual miRNAs, gene ontology analysis suggested several broad categories in which sex-biased RNAs might act to establish sex differences in the embryonic mouse brain. Finally, mining publicly available SNP data indicated that some sex-biased miRNAs reside near the genomic regions associated with neurodevelopmental disorders. CONCLUSIONS: Together, these findings reinforce the importance of cataloguing sex differences in molecular biology research and highlight genes, miRNAs, and pathways of interest that may be important for sexual differentiation in the mouse and possibly the human brain.

In biomedical research, understanding the differences between males and females is essential for understanding diseases that affect one sex more than the other. This study focused on gene expression and regulation differences between male and female mouse brains during development. We found that many microRNAs, small molecules that play a role in development were expressed differently between male and female brains. These differences could be important in understanding why males and females develop differently, particularly regarding neurodevelopmental disorders like ADHD, schizophrenia, and autism. We also found that some microRNAs that differed between males and females were located near genes associated with these disorders. Overall, the study highlights the importance of understanding sex differences in molecular biology research and provides insights into potential genes and pathways of interest for further study.

Nurse Standing Orders for Buprenorphine Follow-Up Care in a Community Health Center Network.

BACKGROUND: Less than 20% of individuals with opioid use disorder (OUD) are receiving a medication treatment for OUD in the United States. Though nurses can assume critical roles in outpatient models of OUD care, there are no published reports of buprenorphine standing orders for nurses that guide a nuanced response for patients returning as expected versus those re-engaging after a treatment lapse, without requiring real-time prescriber consultation. METHODS: Standing orders for buprenorphine were created with multiple stakeholders within an urban community health center that includes traditional clinics as well as non-traditional homeless care sites. After more than two years of use, an anonymous survey assessed staff perception of usability and safety of the standing orders using the validated system usability scale (SUS) and a 5-item Likert scale. Patient retention rates at 12 and 18 months were compared for sites that were early- and late-adopters of the standing orders. RESULTS: Of 24 clinicians and 7 nurses who responded to the survey, 46% had used the standing orders. More than 85% reported a perception that the standing orders improved team-based care and increased access to buprenorphine refills. None reported any safety concerns. The median SUS score was 75.0 (SD 15.4), rated as "excellent". There was no statistically significant difference in 12- or 18-month retention rates between early- and late-adopter sites of the standing orders. CONCLUSIONS: Nurse standing orders for buprenorphine follow-up and re-engagement care are feasible, usable and perceived as safe in varied community health center settings.

Improving Certified Registered Nurse Anesthetists' Adherence to a Standardized Intraoperative Lung Protective Ventilation Protocol.

PURPOSE: The use of lung protective ventilation (LPV) during general anesthesia is an effective strategy among certified registered nurse anesthetists (CRNAs) to reduce and prevent the incidence of postoperative pulmonary complications. The purpose of this project was to implement a LPV protocol, assess CRNA provider adherence, and investigate differences in ventilation parameters and postoperative oxygen requirements. DESIGN: This quality improvement project was conducted using a pre- and postimplementation design. METHODS: Sixty patients undergoing robotic laparoscopic abdominal surgery and 35 CRNAs at a community hospital participated. An evidence-based intraoperative LPV protocol was developed, CRNA education was provided, and the protocol was implemented. Pre- and postimplementation, CRNA knowledge, and confidence were assessed. Ventilation data were collected at 1-minute intervals intraoperatively and oxygen requirements were recorded in the postanesthesia care unit (PACU). FINDINGS: Use of intraoperative LPV strategies increased 2.4%. Overall CRNA knowledge (P = .588), confidence (P = .031), and practice (P < .001) improved from pre- to postimplementation. Driving pressures decreased from pre- to postimplementation (P < .001). Supplemental oxygen use on admission to the PACU decreased from 93.3% to 70.0%. CONCLUSIONS: Educational interventions and implementation of a standardized protocol can improve the use of intraoperative LPV strategies and patient outcomes.

Sense of purpose among transgender adults in the United States: comparisons of levels and health correlates.

Given the increased threats to health and well-being faced by transgender individuals, research is needed to understand potential protective factors. Recent work has suggested that a sense of purpose may be one of the health-promoting resources available to marginalized groups, and levels of purpose are often similar or even higher among these groups. However, research is limited regarding whether this factor manifests differently among transgender adults. The current study (n = 1968 U.S. adults; 4.3% identified as transgender) asked participants to complete surveys for sense of purpose, self-rated health, life satisfaction and the type of purposes they deemed important. The findings suggest no difference in levels of sense of purpose between transgender and non-transgender adults. Transgender adults reported slightly lower levels of importance across multiple purposes, which merits further investigation into whether they perceive greater obstacles toward those goals. Of central importance, sense of purpose positively correlated with self-rated health (r = .50) and life satisfaction for transgender adults (r = .77), at similar or even greater magnitudes than for the non-transgender adults. These results point to the potential of exploring sense of purpose as an intervention target for promoting transgender health and well-being, and future directions should focus on the multiple pathways by which transgender identity may influence purpose development.

RNA sequencing and expression analysis reveal a role for Lhx9 in the haploinsufficient adult mouse ovary.

Understanding the molecular pathways that underpin ovarian development and function is vital for improving the research approaches to investigating fertility. Despite a significant improvement in our knowledge of molecular activity in the ovary, many questions remain unanswered in the quest to understand factors influencing fertility and ovarian pathologies such as cancer. Here, we present an investigation into the expression and function of the developmental transcription factor LIM Homeobox 9 (LHX9) in the adult mouse ovary. We have characterized Lhx9 expression in several cell types of the mature ovary across follicle stages. To evaluate possible LHX9 function in the adult ovary, we investigated ovarian anatomy and transcription in an Lhx9+/- knockout mouse model displaying subfertility. Despite a lack of gross anatomical differences between genotypes, RNA-sequencing found that 90 differentially expressed genes between Lhx9+/ - and Lhx9+/+ mice. Gene ontology analyses revealed a reduced expression of genes with major roles in ovarian steroidogenesis and an increased expression of genes associated with ovarian cancer. Analysis of the ovarian epithelium revealed Lhx9+/ - mice have a disorganized epithelial phenotype, corresponding to a significant increase in epithelial marker gene expression. These results provide an analysis of Lhx9 in the adult mouse ovary, suggesting a role in fertility and ovarian epithelial cancer.

Testing assumptions underlying cabezon (Scorpaenichthys marmoratus) otolith microstructure analysis using wild-caught juveniles and opportunistic rearing of eggs and larvae.

Otolith microstructure analysis provides critical biological and ecological information about the early life history of fishes. This information is particularly important to interpret and predict population dynamics for socio-economically important fisheries species; nonetheless, several key assumptions underpin the use of otolith techniques. The authors validated the use of this analysis for cabezon (Scorpaenichthys marmoratus; Ayres, 1854), a long-lived, large-bodied cottid constituent of nearshore fisheries from Baja California, Mexico, to Alaska, USA. To test three critical assumptions, the authors coupled otolith and morphometric analyses from an opportunistic rearing study of cabezon eggs and larvae with a long-term time series of juvenile cabezon field collections. The authors confirmed the daily otolith increment deposition in laboratory-reared larvae, identified the timing of first otolith increment deposition and examined the relationship between otolith growth and somatic growth in field-collected juveniles, validating the use of otolith microstructure analysis in biological and ecological interpretations of early life-history traits for this species. The findings of this study also indicated that the absorption of yolk-sac reserves, and likely the transition to exogenous feeding, plays an important role in regulating otolith increment deposition. Finally, the authors found within-brood size-at-age variation, which may be an advantage for young fish in prey-limited environments.