Adherence to Pre-Exposure Prophylaxis in Adolescents and Young Adults: A Systematic Review and Meta-Analysis

This meta-analysis synthesized the proportion of adolescents and young adults (AYAs) who are adherent to pre-exposure prophylaxis (PrEP) and factors moderating adherence. A systematic search was conducted of studies published through May 2020 using PubMed, PsycInfo, Cochrane, EMBASE, and CINAHL. Included studies reported the proportion of AYAs (mean age ≤ 29 years) who were PrEP adherent. PrEP adherence was meta-analyzed using random-effects models. Secondary analyses evaluated potential moderating variables. A total of 41 individual samples, from 29 studies, of 8,679 AYA (weighted average age = 23.8 years) were synthesized. The proportion of AYA who met study-defined thresholds for PrEP adherence was .64 (95% confidence interval .57-.71) across studies. Subgroup analyses revealed that adherence was lower in young cisgender women (.46) than young men who have sex with men (.65) and serodiscordant heterosexual couples (.98). Adherence was higher in studies initiated after 2012 (.70) than earlier studies (.47). No differences based on participant age, country, or strategies to promote adherence were found. Across published studies to date, 64% of AYA demonstrate adequate PrEP adherence. Findings can be used to guide PrEP adherence interventions and also provide directions for future research on PrEP among AYA.

Postoperative outcomes in oesophagectomy with trainee involvement

BACKGROUND

The complexity of oesophageal surgery and the significant risk of morbidity necessitates that oesophagectomy is predominantly performed by a consultant surgeon, or a senior trainee under their supervision. The aim of this study was to determine the impact of trainee involvement in oesophagectomy on postoperative outcomes in an international multicentre setting.

METHODS

Data from the multicentre Oesophago-Gastric Anastomosis Study Group (OGAA) cohort study were analysed, which comprised prospectively collected data from patients undergoing oesophagectomy for oesophageal cancer between April 2018 and December 2018. Procedures were grouped by the level of trainee involvement, and univariable and multivariable analyses were performed to compare patient outcomes across groups.

RESULTS

Of 2232 oesophagectomies from 137 centres in 41 countries, trainees were involved in 29.1 per cent of them (n = 650), performing only the abdominal phase in 230, only the chest and/or neck phases in 130, and all phases in 315 procedures. For procedures with a chest anastomosis, those with trainee involvement had similar 90-day mortality, complication and reoperation rates to consultant-performed oesophagectomies (P = 0.451, P = 0.318, and P = 0.382, respectively), while anastomotic leak rates were significantly lower in the trainee groups (P = 0.030). Procedures with a neck anastomosis had equivalent complication, anastomotic leak, and reoperation rates (P = 0.150, P = 0.430, and P = 0.632, respectively) in trainee-involved versus consultant-performed oesophagectomies, with significantly lower 90-day mortality in the trainee groups (P = 0.005).

CONCLUSION

Trainee involvement was not found to be associated with significantly inferior postoperative outcomes for selected patients undergoing oesophagectomy. The results support continued supervised trainee involvement in oesophageal cancer surgery.

Associations between adolescents' pornography consumption and self-objectification, body comparison, and body shame

Although prior work indicates an association between idealized media content and adolescents' body-related concerns, such as self-objectification, body comparison, and body shame, few prior studies have examined the role of pornography. Even fewer studies have included adolescent girls, limiting our understanding of potential gender differences. In this brief report, we investigate these associations in a diverse mixed-gender sample of high school students in the Southeastern U.S. (n = 223, ages 15-18, M _age = 16.25, 59 % girls) who completed computerized self-report measures. Controlling for demographic covariates and frequency of social media use, we found an association between frequency of pornography consumption in the past year and higher self-objectification and body comparison, but not body shame. No evidence of differences by gender emerged. Results suggest that both boys and girls may be susceptible to pornography-related body concerns, yet these concerns may not include body shame. Future research should examine both risks and benefits of pornography use among adolescents using longitudinal designs, as well as how body-related concerns can be incorporated into pornography literacy interventions.

Mortality from esophagectomy for esophageal cancer across low, middle, and high-income countries: An international cohort study

BACKGROUND

No evidence currently exists characterising global outcomes following major cancer surgery, including esophageal cancer. Therefore, this study aimed to characterise impact of high income countries (HIC) versus low and middle income countries (LMIC) on the outcomes following esophagectomy for esophageal cancer.

METHOD

This international multi-center prospective study across 137 hospitals in 41 countries included patients who underwent an esophagectomy for esophageal cancer, with 90-day follow-up. The main explanatory variable was country income, defined according to the World Bank Data classification. The primary outcome was 90-day postoperative mortality, and secondary outcomes were composite leaks (anastomotic leak or conduit necrosis) and major complications (Clavien-Dindo Grade III - V). Multivariable generalized estimating equation models were used to produce adjusted odds ratios (ORs) and 95% confidence intervals (CI95%).

RESULTS

Between April 2018 to December 2018, 2247 patients were included. Patients from HIC were more significantly older, with higher ASA grade, and more advanced tumors. Patients from LMIC had almost three-fold increase in 90-day mortality, compared to HIC (9.4% vs 3.7%, p < 0.001). On adjusted analysis, LMIC were independently associated with higher 90-day mortality (OR: 2.31, CI95%: 1.17-4.55, p = 0.015). However, LMIC were not independently associated with higher rates of anastomotic leaks (OR: 1.06, CI95%: 0.57-1.99, p = 0.9) or major complications (OR: 0.85, CI95%: 0.54-1.32, p = 0.5), compared to HIC.

CONCLUSION

Resections in LMIC were independently associated with higher 90-day postoperative mortality, likely reflecting a failure to rescue of these patients following esophagectomy, despite similar composite anastomotic leaks and major complication rates to HIC. These findings warrant further research, to identify potential issues and solutions to improve global outcomes following esophagectomy for cancer.

Comparison of short-term outcomes from the International Oesophago-Gastric Anastomosis Audit (OGAA), the Esophagectomy Complications Consensus Group (ECCG), and the Dutch Upper Gastrointestinal Cancer Audit (DUCA)

BACKGROUND

The Esophagectomy Complications Consensus Group (ECCG) and the Dutch Upper Gastrointestinal Cancer Audit (DUCA) have set standards in reporting outcomes after oesophagectomy. Reporting outcomes from selected high-volume centres or centralized national cancer programmes may not, however, be reflective of the true global prevalence of complications. This study aimed to compare complication rates after oesophagectomy from these existing sources with those of an unselected international cohort from the Oesophago-Gastric Anastomosis Audit (OGAA).

METHODS

The OGAA was a prospective multicentre cohort study coordinated by the West Midlands Research Collaborative, and included patients undergoing oesophagectomy for oesophageal cancer between April and December 2018, with 90 days of follow-up.

RESULTS

The OGAA study included 2247 oesophagectomies across 137 hospitals in 41 countries. Comparisons with the ECCG and DUCA found differences in baseline demographics between the three cohorts, including age, ASA grade, and rates of chronic pulmonary disease. The OGAA had the lowest rates of neoadjuvant treatment (OGAA 75.1 per cent, ECCG 78.9 per cent, DUCA 93.5 per cent; P < 0.001). DUCA exhibited the highest rates of minimally invasive surgery (OGAA 57.2 per cent, ECCG 47.9 per cent, DUCA 85.8 per cent; P < 0.001). Overall complication rates were similar in the three cohorts (OGAA 63.6 per cent, ECCG 59.0 per cent, DUCA 62.2 per cent), with no statistically significant difference in Clavien-Dindo grades (P = 0.752). However, a significant difference in 30-day mortality was observed, with DUCA reporting the lowest rate (OGAA 3.2 per cent, ECCG 2.4 per cent, DUCA 1.7 per cent; P = 0.013).

CONCLUSION

Despite differences in rates of co-morbidities, oncological treatment strategies, and access to minimal-access surgery, overall complication rates were similar in the three cohorts.

668 The Consequences to Emergency Surgery During COVID19 Pandemic in a UK District General Hospital in The North East of England

Aim

COVID19 pandemic has significantly affected surgical services. We aim to review its effects on our theatre output and risk of encountering COVID 19 cases.

Method

Serial record of operations performed locally were reviewed from start of UK COVID19 pandemic lockdown on 23rd March 2020 to 13th July 2020 after it was lifted. A weekly average by month of operations and the percentage of COVID19 cases diagnosed within 30 days of the procedure were noted.

Results

733 operations performed through this period. In March, 33 operations/week performed, 88.4% emergency and 7% diagnosed with COVID19. April, 31 operations /week performed, 95.9% emergency and 10.6% diagnosed with COVID19. May 46 operations /week performed, 94.5% emergency and 3.3% diagnosed with COVID19. June 56 operations /week, 80.9% emergency and less than 0.01% diagnosed with COVID19. By July 80 operations/week, 59.4% emergency and none diagnosed with COVID 19. Since testing capacity increased, only 6 of the 27 operated were diagnosed with COVID19.

Conclusions

There was initial reduction to non-emergency workload. However, this has gradually shifted as protocols are in place improve public confidence to return for surgical treatment. Mandatory admission testing allows early identification and remains essential for planning of services and protecting the workforce.

Primitive model electrolytes in the near and far field: Decay lengths from DFT and simulations

Inspired by recent experimental observations of anomalously large decay lengths in concentrated electrolytes, we revisit the Restricted Primitive Model (RPM) for an aqueous electrolyte. We investigate the asymptotic decay lengths of the one-body ionic density profiles for the RPM in contact with a planar electrode using classical Density Functional Theory (DFT) and compare these with the decay lengths of the corresponding two-body correlation functions in bulk systems, obtained in previous Integral Equation Theory (IET) studies. Extensive Molecular Dynamics (MD) simulations are employed to complement the DFT and IET predictions. Our DFT calculations incorporate electrostatic interactions between the ions using three different (existing) approaches: one is based on the simplest mean-field treatment of Coulomb interactions (MFC), while the other two employ the Mean Spherical Approximation (MSA). The MSAc invokes only the MSA bulk direct correlation function, whereas the MSAu also incorporates the MSA bulk internal energy. Although MSAu yields profiles that are in excellent agreement with MD simulations in the near field, in the far field, we observe that the decay lengths are consistent between IET, MSAc, and MD simulations, whereas those from MFC and MSAu deviate significantly. Using DFT, we calculated the solvation force, which relates directly to surface force experiments. We find that its decay length is neither qualitatively nor quantitatively close to the large decay lengths measured in experiments and conclude that the latter cannot be accounted for by the primitive model. The anomalously large decay lengths found in surface force measurements require an explanation that lies beyond primitive models.

Ruling out Color Transparency in Quasielastic ^{12}C(e,e^{'}p) up to Q^{2} of 14.2 (GeV/c)^{2}

Quasielastic ^{12}C(e,e^{'}p) scattering was measured at spacelike 4-momentum transfer squared Q^{2}=8, 9.4, 11.4, and 14.2  (GeV/c)^{2}, the highest ever achieved to date. Nuclear transparency for this reaction was extracted by comparing the measured yield to that expected from a plane-wave impulse approximation calculation without any final state interactions. The measured transparency was consistent with no Q^{2} dependence, up to proton momenta of 8.5  GeV/c, ruling out the quantum chromodynamics effect of color transparency at the measured Q^{2} scales in exclusive (e,e^{'}p) reactions. These results impose strict constraints on models of color transparency for protons.

Adapting evidence-informed population health interventions for new contexts: a scoping review of current practice

BACKGROUND

Implementing evidence-informed population health interventions in new contexts often requires adaptations. While the need to adapt interventions to better fit new contexts is recognised, uncertainties remain regarding why and when to adapt (or not), and how to assess the benefits (or not) of adaptation. The ADAPT Study aims to develop comprehensive guidance on adaptation. This scoping review informs guidance development by mapping and exploring how adaptation has been undertaken in practice, in public health and health services research.

METHODS

We searched seven databases from January 2000 and October 2018 to identify eligible studies for this scoping review and a related systematic review of adaptation guidance. We mapped the studies of adaptation by coding data from all eligible studies describing the methods, contexts, and interventions considered for adaptation. From this map, we selected a sample of studies for in-depth examination. Two reviewers extracted data independently into seven categories: description, key concepts, types, rationale, processes, evaluation methods, evaluation justification, and accounts of failures and successes.

RESULTS

We retrieved 6694 unique records. From 429 records screened at full text, we identified 298 eligible studies for mapping and selected 28 studies for in-depth examination. The majority of studies in our map focused on micro- (i.e., individual-) level interventions (84%), related to transferring an intervention to a new population group within the same country (62%) and did not report using guidance (73%). Studies covered a range of topic areas, including health behaviour (24%), mental health (19%), sexual health (16%), and parenting and family-centred interventions (15%). Our in-depth analysis showed that adaptation is seen to save costs and time relative to developing a new intervention, and to enhance contextual relevance and cultural compatibility. It commonly follows a structured process and involves stakeholders to help with decisions on what to adapt, when, and how.

CONCLUSIONS

Adaptation has been undertaken on a range of health topics and largely in line with existing guidance. Significant gaps relate to adaptation of macro- (e.g., national-) level interventions, consideration of programme theories, mechanisms and contexts (i.e., a functional view of interventions), nuances around stakeholder involvement, and evaluation of the adapted interventions. Registration Open Science Framework, 2019, osf.io/udzma.

Social self-efficacy and sexual communication among adolescents in the United States: a cross-sectional study

Background Sexual communication between partners is associated with safer sex behaviours, including condom use among adolescents. Several studies have found a relationship between negative psychological constructs (e.g. depression, anxiety) and poor sexual communication; however, scant research exists regarding positive psychological constructs and their potential to promote effective sexual communication among adolescents. This study examined the association between a positive construct, social self-efficacy - a person's belief in their ability to successfully manage social relationships - and three components of sexual communication: sexual assertiveness, self-efficacy for communication, and frequency of sexual communication with dating partners.

METHODS

Data were collected in a cross-sectional survey from 222 high school girls in a rural school district in the south-eastern United States (Mage = 15.2; 38% White, 29% Latina, 24% Black; 50% were in a dating relationship in the past 3 months). Variables were measured with Likert-type scales. Bivariate correlation and regression analyses were conducted.

RESULTS

Social self-efficacy was significantly positively associated with sexual assertiveness and sexual communication self-efficacy for all girls, and there was a positive trend in the relationship between social self-efficacy and communication frequency among the subsample of girls who had a dating partner. The significant relationship with sexual assertiveness (β = 0.22, s.e. = 0.07, P = 0.001) and sexual communication self-efficacy (β = 0.17, s.e. = 0.04, P = 0.013) remained when controlling for sexual activity status.

CONCLUSIONS

Strengthening social self-efficacy may enhance girls' sexual communication and assertiveness skills. Future studies are needed to confirm the causal and temporal nature of these associations.

Probing the Deuteron at Very Large Internal Momenta

We measure ^{2}H(e,e^{'}p)n cross sections at 4-momentum transfers of Q^{2}=4.5±0.5  (GeV/c)^{2} over a range of neutron recoil momenta p_{r}, reaching up to ∼1.0  GeV/c. We obtain data at fixed neutron recoil angles θ_{nq}=35°, 45°, and 75° with respect to the 3-momentum transfer q[over →]. The new data agree well with previous data, which reached p_{r}∼500  MeV/c. At θ_{nq}=35° and 45°, final state interactions, meson exchange currents, and isobar currents are suppressed and the plane wave impulse approximation provides the dominant cross section contribution. We compare the new data to recent theoretical calculations, where we observe a significant discrepancy for recoil momenta p_{r}>700  MeV/c.

MRI in acute muscle tears in athletes: can quantitative T2 and DTI predict return to play better than visual assessment?

OBJECTIVES

To assess the ability of quantitative T2, diffusion tensor imaging (DTI) and radiologist's scores to detect muscle changes following acute muscle tear in soccer and rugby players. To assess the ability of these parameters to predict return to play times.

METHODS

In this prospective, longitudinal study, 13 male athletes (age 19 to 34 years; mean 25 years) underwent MRI within 1 week of suffering acute muscle tear. Imaging included measurements of T2 and DTI parameters. Images were also assessed using modified Peetrons and British athletics muscle injury classification (BAMIC) scores. Participants returned for a second scan within 1 week of being determined fit to return to play. MRI measurements were compared between visits. Pearson's correlation between visit 1 measurements and return to play times was assessed.

RESULTS

There were significant differences between visits in BAMIC scores (Z = - 2.088; p = 0.037), modified Peetrons (Z = - 2.530; p = 0.011) and quantitative MRI measurements; T2, 13.12 ms (95% CI, 4.82 ms, 21.42 ms; p = 0.01); mean diffusivity (0.22 (0.04, 0.39); p = 0.02) and fractional anisotropy (0.07 (0.01, 0.14); p = 0.03). BAMIC scores showed a significant correlation with return to play time (Rs = 0.64; p = 0.02), but modified Peetrons scores and quantitative parameters did not.

CONCLUSIONS

T2 and DTI measurements in muscle can detect changes due to healing following muscle tear. Although BAMIC scores correlated well with return to play times, in this small study, quantitative MRI values did not, suggesting that T2 and DTI measurements are inferior predictors of return to play time compared with visual scoring.

KEY POINTS

• Muscle changes following acute muscle tear can be measured using T2 and diffusion measurements on MRI. • Measurements of T2 and diffusion using MRI are not as good as a radiologist's visual report at predicting return to play time after acute muscle tear.

Patient consent in emergency cardiovascular medicine: lessons from the ARREST trial in out-of-hospital cardiac arrest

Introduction

Randomised trials in emergency cardiovascular medicine are challenging but vital for improving patient care. Obtaining informed consent in such an environment is a particular issue and can be controversial. The ARREST trial is assessing whether out-of-hospital cardiac arrest patients without an obvious cause should be taken to a specialist heart centre or the closest emergency department in London, UK. This patient group presents specific difficulties: patients lack capacity to consent, presentation is unpredictable, care must not be delayed, and mortality rates can be &gt;50%.

Purpose

Within existing consent and methodological frameworks we aimed to design a randomised clinical trial to pragmatically, safely and ethically recruit cardiac arrest patients pre-hospital.

Methods

During the set-up of ARREST we accessed the following sources of information: 1) ARREST research team; 2) cardiovascular patient groups; 3) researchers running similar trials; 4) regulatory bodies; and, 5) published literature on research in emergency contexts. The information that we collected guided the design of the trial with a focus on patient consent, documentation and follow-up.

Results

The ARREST trial uses deferred consent with remote online randomisation to enrol patients without delaying care. To minimise the risk of bias, baseline and primary endpoint data are collected on patients who die or are discharged prior to consent. Remote follow-up using electronic health records reduces the burden on the patients and researchers. Full ethical approval was received in January 2018 and the first patient was enrolled in February 2018. ARREST is recruiting to target and is on track to finish within the projected timelines.

Conclusions

Deferred consent has been key to the success of ARREST and patients have been receptive. However, further research into the experience of patients in emergency cardiovascular medicine trials using deferred consent is needed to better understand when it is an appropriate model. More broadly, there is a shortfall in high quality research in challenging environments such as emergency cardiovascular care. Innovation in consent methods and proportional research governance would facilitate higher quality research and benefit patient care.

Funding Acknowledgement

Type of funding source: Foundation. Main funding source(s): British Heart Foundation

Preliminary Evaluation of a Prescription Opioid Misuse Prevention Program Among Rural Middle School Students

Adolescent opioid misuse, addiction, and overdose have emerged as national health crises. Nearly 17% of high school students have misused prescription opioids. The purpose of this study was to evaluate the reach and acceptability of a widely-used prescription opioid misuse prevention program, This Is (Not) About Drugs© (TINAD), and its preliminary efficacy at improving opioid misuse knowledge, opioid misuse attitudes, self-efficacy to avoid opioid misuse, and intentions to misuse opioids. Participants were 576 7th grade students (M_age = 11.8; 51% boys; 39% Hispanic, 31% White, 20% Black) from a rural county in the southeastern U.S. All participants received the TINAD program and completed pretest and immediate posttest assessments. The program was school-based and implemented in collaboration with school teachers and administrators. Over 91% of all eligible students in the school district participated in the TINAD program. Most participants found the program acceptable-over 83% of students liked the program. Approximately 9% of participants reported prior misuse of prescription opioids. After participating in TINAD, students self-reported higher knowledge and self-efficacy as well as safer attitudes. However, there was no change in intentions to misuse opioids in the future. Effects of the program were consistent across gender, socioeconomic status, race/ethnicity, and previous opioid misuse. TINAD is acceptable and shows promise for improving opioid-related cognitions. However, more rigorous experimental and longitudinal research is needed to understand whether TINAD reduces opioid misuse over time. Given the limited research on adolescent opioid misuse prevention, this study lays the ground work for future randomized control trials.

Sexual Health Programs for Latinx Adolescents: A Meta-analysis

CONTEXT

Latinx adolescents are at risk for negative sexual health outcomes, and many interventions have been developed to reduce this risk.

OBJECTIVE

In this meta-analysis, we synthesized the literature on sexual health interventions for Latinx adolescents and examined intervention effects on 3 behavioral outcomes (abstinence, condom use, number of sex partners) and 3 psychological outcomes (safer sex knowledge, intentions, self-efficacy). Moderators of intervention success were explored.

DATA SOURCES

A systematic search of studies published through January 2019 was conducted by using PubMed, PsycINFO, and Cumulative Index to Nursing and Allied Health Literature databases.

STUDY SELECTION

All studies included a US-based sample of Latinx adolescents, evaluated sexual health intervention by using an experimental or quasiexperimental design, included a behavioral outcome, and were in English.

DATA EXTRACTION

Standardized mean difference (d) and 95% confidence intervals (CIs) were meta-analyzed by using random-effects models.

RESULTS

Effect sizes from 12 studies, sampling 4673 adolescents, were synthesized. Sexual health interventions improved abstinence (d = 0.15, 95% CI: 0.02 to 0.28), condom use (d = 0.44, 95% CI: 0.18 to 0.70), number of sex partners (d = -0.19, 95% CI: -0.37 to -0.001), and sexual health knowledge (d = 0.40, 95% CI: 0.10 to 0.70), compared with control conditions. Effects were consistent across a number of demographic and clinical characteristics, although culturally tailored interventions produced greater change in condom use than nontailored interventions.

LIMITATIONS

There was variation across studies in measures of sexual behavior, and some elements of individual study quality were unclear.

CONCLUSIONS

Sexual health interventions have a small but significant impact on improving safer sexual behavior among Latinx adolescents. Health educators should consider the importance of cultural tailoring to program success.

Association of Sexual Health Interventions With Sexual Health Outcomes in Black Adolescents: A Systematic Review and Meta-analysis

IMPORTANCE

Black adolescents are at increased risk of contracting HIV and other sexually transmitted infections (STIs) and experiencing unplanned pregnancy. Although sexual health interventions aimed at decreasing these risks exist, evidence of the association between sexual health interventions and the sexual behavior of black adolescents has not been synthesized to our knowledge.

OBJECTIVE

To examine the associations between sexual health interventions and behavioral, biological, and psychological outcomes.

DATA SOURCES

For this systematic review and meta-analysis, a systematic search was conducted of studies published through January 31, 2019, using the PubMed, PsycINFO, and CINAHL databases and relevant review articles. The following key words were used: youth, adolesc* or teen*; sexual health or safe* sex or sexually transmitted disease or sexually transmitted infection or STD or STI or HIV or AIDS or pregnancy or reproductive health or condom* or contracept* or unprotected sex or abstinence; intervention or program or education or prevention or promotion or trial; latino* or latina* or latinx* or minorit* or ethnic* or hispanic or african american* or black* or race or racial or biracial.

STUDY SELECTION

Studies were included if they included a US-based sample of black adolescents, evaluated a sexual health intervention using experimental or quasi-experimental designs, included a behavioral outcome, and were published in English.

DATA EXTRACTION AND SYNTHESIS

Standardized mean differences and 95% CIs were extracted and meta-analyzed using random-effects models.

MAIN OUTCOMES AND MEASURES

Behavioral outcomes were abstinence, condom use, and number of sex partners. Biological outcomes were pregnancy and STI contraction. Psychological outcomes were sexual health intentions, knowledge, and self-efficacy.

RESULTS

Across 29 studies including 11 918 black adolescents (weighted mean age, 12.43 years), there was a significant weighted mean association of sexual health interventions with improvements in abstinence (Cohen d = 0.14; 95% CI, 0.05-0.24) and condom use (Cohen d = 0.25; 95% CI, 0.11-0.39). No significant mean association of these interventions with number of sex partners, pregnancy, or STI contraction was found. Sexual health interventions were significantly associated with improvements in psychological outcomes: sexual health intentions (Cohen d = 0.17; 95% CI, 0.05-0.30), knowledge (Cohen d = 0.46; 95% CI, 0.30-0.63), and self-efficacy (Cohen d = 0.19; 95% CI, 0.09-0.28). Intervention effect sizes were consistent across factors, such as participant sex and age and intervention dose.

CONCLUSIONS AND RELEVANCE

The findings suggest that sexual health interventions are associated with improvements in sexual well-being among black adolescents. There appears to be a need for wide-scale dissemination of these programs to address racial disparities in sexual health across the US.

Perioperative intravenous contrast administration and the incidence of acute kidney injury after major gastrointestinal surgery: prospective, multicentre cohort study

BACKGROUND

This study aimed to determine the impact of preoperative exposure to intravenous contrast for CT and the risk of developing postoperative acute kidney injury (AKI) in patients undergoing major gastrointestinal surgery.

METHODS

This prospective, multicentre cohort study included adults undergoing gastrointestinal resection, stoma reversal or liver resection. Both elective and emergency procedures were included. Preoperative exposure to intravenous contrast was defined as exposure to contrast administered for the purposes of CT up to 7 days before surgery. The primary endpoint was the rate of AKI within 7 days. Propensity score-matched models were adjusted for patient, disease and operative variables. In a sensitivity analysis, a propensity score-matched model explored the association between preoperative exposure to contrast and AKI in the first 48 h after surgery.

RESULTS

A total of 5378 patients were included across 173 centres. Overall, 1249 patients (23·2 per cent) received intravenous contrast. The overall rate of AKI within 7 days of surgery was 13·4 per cent (718 of 5378). In the propensity score-matched model, preoperative exposure to contrast was not associated with AKI within 7 days (odds ratio (OR) 0·95, 95 per cent c.i. 0·73 to 1·21; P = 0·669). The sensitivity analysis showed no association between preoperative contrast administration and AKI within 48 h after operation (OR 1·09, 0·84 to 1·41; P = 0·498).

CONCLUSION

There was no association between preoperative intravenous contrast administered for CT up to 7 days before surgery and postoperative AKI. Risk of contrast-induced nephropathy should not be used as a reason to avoid contrast-enhanced CT.