Comprehensive analysis of power tool injuries: implications for safety and injury prevention

BACKGROUND

Power tools are essential for productivity but carry significant injury risks. Addressing power tool injuries across diverse age groups is vital, as existing research predominantly focuses on specific occupational or non-occupational groups, leaving a gap in understanding various age cohorts within the diverse American population. This study aims to comprehend power tool injury epidemiology, raising awareness about the importance of targeted safety measures for enhancing public health.

METHODS

Using a ten-year retrospective approach, this study analyzed National Electronic Injury Surveillance System (NEISS) data from US hospital emergency departments (2013-2022). Demographic and temporal trends were examined, and associations between injury occurrence and categorical variables, including injured body parts, gender, and race, were explored.

RESULTS

In 2013, power tool injuries were highest in the "51-60″ age group (23.70 %), followed by "41-50″ (17.31 %) and "61-70″ (19.38 %). Injury rates varied across age groups over the years. Notably, the "41-50″ age group showed a significant decrease in injuries over time (χ² = 17.12, p < .05), indicating a notable temporal trend. Hand injuries were predominant (39.08 %), followed by finger (19.19 %), lower arm (11.25 %), upper arm (8.79 %), and face (4.04 %). Lacerations constituted the most frequent injury type (60.89 %), alongside fractures, amputations, foreign body insertions, and contusions/abrasions. Significant associations emerged between injury occurrence and gender (χ² = 6.19, p < .001), as well as race (χ² = 7.42, p < .001). Males accounted for the majority of injuries (95.97 %), while white individuals constituted the largest proportion (91.84 %). Females and domestic settings exhibited increasing proportions of power tool injuries.

CONCLUSIONS

The higher incidence among middle-aged individuals in domestic settings, coupled with evolving gender dynamics, underscores the need for targeted safety measures. Our findings contribute crucial novel insights, emphasizing tailored preventive strategies to enhance safety outcomes in the multifaceted landscape of power tool use.

A Large-Scale Genome-Wide Study of Gene-Sleep Duration Interactions for Blood Pressure in 811,405 Individuals from Diverse Populations

Although both short and long sleep duration are associated with elevated hypertension risk, our understanding of their interplay with biological pathways governing blood pressure remains limited. To address this, we carried out genome-wide cross-population gene-by-short-sleep and long-sleep duration interaction analyses for three blood pressure traits (systolic, diastolic, and pulse pressure) in 811,405 individuals from diverse population groups. We discover 22 novel gene-sleep duration interaction loci for blood pressure, mapped to genes involved in neurological, thyroidal, bone metabolism, and hematopoietic pathways. Non-overlap between short sleep (12) and long sleep (10) interactions underscores the plausibility of distinct influences of both sleep duration extremes in cardiovascular health. With several of our loci reflecting specificity towards population background or sex, our discovery sheds light on the importance of embracing granularity when addressing heterogeneity entangled in gene-environment interactions, and in therapeutic design approaches for blood pressure management.

Lowering Cranioplasty Infection Incidence with Novel Bone Flap Storage Protocol: A Retrospective Cohort Study

BACKGROUND

After craniectomy, autologous bone flaps may be stored using wet or dry cryopreservation. After brain edema subsides, they are replaced during an operation termed cranioplasty. Cranioplasty is associated with 15% infection incidence.

METHODS

We conducted a retrospective comparison of infection outcomes between wet and dry cryopreservation of cranioplasty bone flaps. Historically, bone flaps were stored utilizing wet cryopreservation-bone flap storage in 1 L of lactated Ringer's solution containing 80 mg gentamicin and 2 g nafcillin in a sterile plastic container secured in an unsterile plastic bag. Our newer dry cryopreservation protocol involved storage in gauze soaked in 80 mg gentamicin and 2 g nafcillin within a 3-layer sterile bag system.

RESULTS

A total of 119 autologous bone flaps were included, with median follow-up of 3.9 months from cranioplasty. Overall, 10.9% became infected, requiring subsequent surgery; 18.4% of 49 bone flaps stored using wet cryopreservation became infected compared with only 5.7% of 70 dry cryopreservation bone flaps (P = 0.038; relative risk [RR] 0.311; absolute risk reduction 12.7%). Tobacco use (P = 0.076; RR 3.17) was not associated with increased infection risk. Infection incidence was similar for traumatic craniectomy indications compared to the other indications (12.0% trauma vs. 10.1% other; P = 0.750). On average, infected cranioplasty patients spent 8.5 more days hospitalized and faced increased risk of additional complications.

CONCLUSIONS

Dry cryopreservation significantly decreases infection after cranioplasty when compared with wet cryopreservation, and this mitigates additional morbidity, mortality, and costs attributable to cranioplasty infection. Other nonmodifiable risk factors for cranioplasty infection were identified.

Discontinuation and nonpublication of clinical trials in orthopaedic oncology

BACKGROUND

Despite the pivotal role of clinical trials in advancing orthopaedic oncology knowledge and treatment strategies, the persistent issues of trial discontinuation and nonpublication are significant problems. This study conducted an analysis examining clinical trial discontinuation rates, associations between intervention types and discontinuation/nonpublication, and the role of funding, enrollment size, and their implications for trial success and completion.

METHODS

This study, conducted on May 1, 2023, utilized a cross-sectional design to comprehensively analyze phase 3 and 4 randomized controlled trials within the realm of orthopaedic oncology. We specifically incorporated Phase 3 and 4 trials as they are designed to evaluate prolonged outcomes in human subjects and are more likely to reach publication. Study characteristics of interest included the intervention utilized in the clinical trial, presence of funding, whether the trial was published, completed, and trial enrollment size. The investigation involved an examination of ClinicalTrials.gov, a prominent online repository of clinical trial data managed by the National Library of Medicine of the USA. Descriptive statistics and multivariate logistic regressions were used to determine statistical significance.

RESULTS

Among the cohort of 130 trials, 19.2% were prematurely discontinued. Completion rates varied based on intervention type; 111 pharmaceutical trials demonstrated a completion rate of 83.8%, whereas 19 non-pharmaceutical trials exhibited a completion rate of 8.0% (P < .001). Surgical trials, totaling 10, showed a completion rate of 90%. The overall trial publication rate was 86.15%, with pharmaceutical interventions achieving a publication rate of 91.96%. Larger-scale trials (≥ 261 participants) emerged as a protective factor against both discontinuation (Adjusted Odds Ratio [AOR]: 0.85, 95% Confidence Interval [CI] 0.42-0.95) and nonpublication (AOR: 0.19, 95% CI 0.13-.47), compared to smaller-scale trials.

CONCLUSION

This study accentuates the heightened vulnerability of non-pharmaceutical interventions and trials exhibiting lower rates of enrollment to the issues of discontinuation and nonpublication. Moving forward, the advancement of clinical trials necessitates a concerted effort to enhance trial methodologies, especially concerning nonpharmaceutical interventions, along with a meticulous refinement of participant enrollment criteria.

Leveraging the Full Continuum of Care to Prevent Opioid Use Disorder

Substance use disorder prevention programs are most effective when matched appropriately to the baseline risk of the population. Individuals who misuse opioids often have unique risk profiles different from those who use other substances such as alcohol or cannabis. However, most substance use prevention programs are geared toward universal audiences, neglecting key inflection points along the continuum of care. The HEAL Prevention Cooperative (HPC) is a unique cohort of research projects that represents a continuum of care, from community-level universal prevention to indicated prevention among older adolescents and young adults who are currently misusing opioids or other substances. This paper describes the theoretical basis for addressing opioid misuse and opioid use disorder across the prevention continuum, using examples from research projects in the HPC.

Expanded Utility of Human Acellular Vessel in Hemodialysis Access Surgery and Arterial Aneurysm Repair

Vascular access is essential for hemodialysis (HD) in patients with end-stage renal disease (ESRD). When the standard of care arteriovenous fistula (AVF) is limited, secondary to aneurysmal degeneration, trauma, and thrombus, interposition grafting is a reasonable reconstruction approach. As these grafts and comorbidities place ESRD patients at sustained risk of complications, reconstructions with regenerative medicine biologic conduits hold promise in improving safety and efficacy. Here, a biocompatible human acellular vessel (HAV) is our conduit of interest. With United States Food and Drug Administration use authorization under the Expanded Access Program, we report three cases of complex vascular access surgery with four aneurysm repairs using HAV. Patient selection focused on meeting unmet needs for those without adequate care alternatives, including active access and endoprosthetic stent graft infections, right heart failure due to high-output AVF, and arterial and access outflow aneurysms. In this high-risk expanded access population, operative technical success and interval success for patients given their inherent comorbidities, offer potential expanded utility of HAV in HD access surgery and arterial aneurysm repair.

Outcomes of Concurrent Ventral Hernia Repair and Cholecystectomy Compared to Ventral Hernia Repair Alone

Introduction It has been suggested that hernia repair with concomitant cholecystectomy increases the risk of postoperative complications due to potential mesh contamination. This study compares postoperative outcomes and complications between patients who underwent ventral hernia repair (VHR) with and without concomitant cholecystectomy (CCY). Methods Using the American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP) database, from 2005 to 2019, we queried patients who underwent ventral hernia repairs using the current procedural terminology (CPT) codes 49652-49657 (laparoscopic) and 49560-49566 (open), with or without cholecystectomy. The ACS NSQIP is a prospective, systematic study of patients who underwent major general surgical procedures aggregating data from over 200 hospitals. Cases involving additional concomitant procedures were excluded. Primary outcomes of interest were 30-day mortality, length of stay, readmission, return to operating room (OR), and postoperative complications. The odds ratio for primary outcomes was calculated using multivariable binomial logistic regression to control for patient risk factors. Results In total, 167586 cases were identified, 165,758 ventral hernia repairs alone, and 1,828 ventral hernia repairs with concomitant cholecystectomy. There was no difference in 30-day mortality, length of stay, readmission, return to the operating room, or postoperative complications between groups. Patients who underwent simultaneous VHR/CCY when compared to those who had VHR alone, had no differences in the rate of surgical site infections (1.86% vs. 1.97%, P = 0.57) or sepsis (0.82% vs. 0.41%, P = 0.10).  Conclusion In a large national sample, there is no significant difference in postoperative outcomes, specifically infection-related complications, when comparing VHR along with concurrent VHR/CCY. Our findings suggest no increased risks for patients undergoing concurrent ventral hernia repair and cholecystectomy. Hence, surgeons might consider this combined approach to offer the best value-based care, especially when it could eliminate the need for a second operation and the risk of infection is low. Prospective studies with more procedural-specific information for hernia repairs and indications for cholecystectomy are needed however it is likely safe to perform both procedures during the same setting in cholecystectomy cases lacking signs of acute infection.

A Retrospective Review of 30-Day Hospital Readmission Risk After Open Heart Surgery in Patients With Atrial Fibrillation

Introduction Readmission rates after open heart surgery (OHS) remain an important clinical issue. The causes are varied, with identifying risk factors potentially providing valuable information to reduce healthcare costs and the rate of post-operative complications. This study aimed to characterize the reasons for 30-day hospital readmission rates of patients after open heart surgery. Methods All patients over 18 years of age undergoing OHS at a community hospital from January 2020 through December 2020 were identified. Demographic data, medical history, operative reports, post-operative complications, and telehealth interventions were obtained through chart review. Descriptive statistics and readmission rates were calculated, along with a logistic regression model, to understand the effects of medical history on readmission. Results A total of 357 OHS patients met the inclusion criteria for the study. Within the population, 8.68% of patients experienced readmission, 10.08% had an emergency department (ED) visit, and 95.80% had an outpatient office visit. A history of atrial fibrillation (AFib) significantly predicted 30-day hospital readmissions but not ED or outpatient office visits. Telehealth education was delivered to 66.11% of patients. Conclusion The study investigated factors associated with 30-day readmission following OHS. AFib patients were more likely to be readmitted than patients without atrial fibrillation. No other predictors of readmission, ED visits, or outpatient office visits were found. Patients reporting symptoms of tachycardia, pain, dyspnea, or "other" could be at increased risk for readmission.

Examination and Scientific Analysis of Thoracic Vertebral Fractures

Background Thoracic vertebral fractures are clinically important due to their association with the thoracic spinal cord and the potential to cause devastating neurological injury. Using the National Electronic Injury Surveillance System (NEISS) data, this study investigated fracture patterns to understand associated factors to improve prevention strategies. We explored different factors associated with thoracic vertebral fractures to improve our understanding of preventative strategies and patient care standards, focusing on spatial distribution, sex-age dynamics, and location of injury. Methodology This retrospective, cross-sectional study examines thoracic vertebral fractures across diverse age groups from 2013 to 2022, utilizing the NEISS database from the U.S. Consumer Product Safety Commission. Inclusion criteria based on specific terms related to thoracic fractures were employed. Descriptive statistics illustrated fracture distribution by age groups and associated products. Statistical analyses, including chi-square tests and multivariate logistic regressions, were conducted to explore associations between fracture occurrence, locations, products, age, and gender. Results The analysis of thoracic vertebral fractures by location and associated products yielded several statistically significant findings. Notably, the prevalence of fractures at home (39.67%) was significantly higher than in other locations, and these differences in fracture distribution were statistically significant (χ² = 7.34, p < 0.001). Among the associated products, ladders (10.46%) emerged as the most frequent product associated with fractures. Multivariate logistic regression analysis showed that the age groups of 41-50, 51-60, and 61-70 had increased odds of fractures with adjusted odds ratios (AORs) of 1.08 (95% confidence interval (CI) = 1.04-1.42, p < 0.05), 1.21 (95% CI = 1.13-1.56, p < 0.001), and 1.17 (95% CI = 1.08-1.39, p < 0.001), respectively. The likelihood of thoracic vertebral fractures did not significantly differ between males and females (AOR = 1.12, 95% CI = 0.87-1.53, p = 0.262). Fracture distribution by age groups and products indicated increasing ladder-related fractures within the 41-50 age group and 51-60 age group. Football-related fractures peaked within the 21-30 age group. Fracture distribution patterns for bicycles had increased prevalence within the 11-20 and 21-30 age groups, and football-related fractures in younger age groups. Conclusions This study analyzed factors associated with thoracic vertebral fractures, showing the significance of targeted preventative interventions, such as earlier screening, physical therapy, and nutritional status assessment, in the setting of significant location and age-related susceptibilities. The observed patterns of injury provide a foundation for future research to elucidate the underlying mechanisms between different environments and the likelihood of injury to improve preventive strategies.

Spine Injuries in Household Environments: A Comprehensive Analysis

Introduction Recognizing the concerns posed by spine injuries within homes, stemming from falls, interactions with furnishings, and daily activities, it is imperative to consider preventive strategies. Our analysis of spine injuries utilizing the National Electronic Injury Surveillance System (NEISS) data sheds light on falls, furnishings, age-specific risks, recreation, technology, and socioeconomic disparities as contributing elements, accentuating the need for targeted interventions. This study aims to provide insights into the prevalence of spine injuries in different household locations, associated products, age groups, and gender, thus informing injury prevention strategies for safer living environments. Methods This is a retrospective, cross-sectional study utilizing data between 2013 to 2022 from the National Electronic Injury Surveillance System database. Specific household product codes and demographic data, such as age and gender, were analyzed. Statistical analysis in R (R Foundation for Statistical Computing, Vienna, Austria) involved descriptive statistics and multivariate logistic regressions. Results In analyzing 44,267 spine injuries, the study revealed location-specific variations in spine injuries within households. Living rooms and bedrooms had the highest injury rates at 34.17% and 21.65%, respectively. Significant differences in injury rates between males and females across various home locations. Females accounted for 51.78% of injuries in the living room and 59.99% in the bedroom. In the kitchen, females experienced 53.21% of injuries, while males accounted for 46.79% of cases. Notably, overall spine injuries exhibited a significant difference between males and females, with females having a higher total likelihood of injuries (AOR = 1.21, 95% CI: 1.14-1.77, p < 0.001). Regarding age, individuals between 51-60 years were most vulnerable to spine injuries, accounting for 17.98% of total cases. Notably, the age group of 61-70 years exhibited a substantial proportion of injuries at 17.12%, while the age group of 71-80 years accounted for 14.39%. The age group of 41-50 years also displayed a notable injury rate of 14.12%. The youngest age group, 0-10 years, demonstrated the lowest percentage of injuries at 4.79%. This age-based analysis provides valuable insights into the distribution of spine injuries across different demographic segments. Regarding age, individuals between 51-60 years were most vulnerable to spine injuries, comprising 17.98% of total cases. Age groups of 41-50 and 61-70 years also showed substantial proportions of injuries, accounting for 14.12% and 17.12%, respectively. The youngest age group, 0-10, exhibited the lowest percentage of injuries at 4.79%. Conclusion The study focuses on the occurrence of spinal injuries in common sites of injury in the household, such as the living room, bedroom, kitchen, and stairs. There is increased prevalence amongst females and increased risk vulnerability amongst people 51 to 60 years of age. Our research emphasizes the necessity of implementing specific injury prevention measures tailored to different demographic groups within their home setting. This approach should involve collaborative decision-making with patients while prioritizing patient education to create a safer living environment and reduce the likelihood of spine injuries.

Genomic Innovation in Early Life Cardiovascular Disease Prevention and Treatment

Cardiovascular disease (CVD) is a leading cause of morbidity and mortality globally. Although CVD events do not typically manifest until older adulthood, CVD develops gradually across the life-course, beginning with the elevation of risk factors observed as early as childhood or adolescence and the emergence of subclinical disease that can occur in young adulthood or midlife. Genomic background, which is determined at zygote formation, is among the earliest risk factors for CVD. With major advances in molecular technology, including the emergence of gene-editing techniques, along with deep whole-genome sequencing and high-throughput array-based genotyping, scientists now have the opportunity to not only discover genomic mechanisms underlying CVD but use this knowledge for the life-course prevention and treatment of these conditions. The current review focuses on innovations in the field of genomics and their applications to monogenic and polygenic CVD prevention and treatment. With respect to monogenic CVD, we discuss how the emergence of whole-genome sequencing technology has accelerated the discovery of disease-causing variants, allowing comprehensive screening and early, aggressive CVD mitigation strategies in patients and their families. We further describe advances in gene editing technology, which might soon make possible cures for CVD conditions once thought untreatable. In relation to polygenic CVD, we focus on recent innovations that leverage findings of genome-wide association studies to identify druggable gene targets and develop predictive genomic models of disease, which are already facilitating breakthroughs in the life-course treatment and prevention of CVD. Gaps in current research and future directions of genomics studies are also discussed. In aggregate, we hope to underline the value of leveraging genomics and broader multiomics information for characterizing CVD conditions, work which promises to expand precision approaches for the life-course prevention and treatment of CVD.

Superficial temporal artery injury and delayed post-cranioplasty infection

OBJECTIVE

Complications after cranioplasty after decompressive craniectomy (DC) have been reported to be as high as 40%. The superficial temporal artery (STA) is at substantial risk for injury in standard reverse question-mark incisions that are typically used for unilateral DC. The authors hypothesize that STA injury during craniectomy predisposes patients to post-cranioplasty surgical site infection (SSI) and/or wound complication.

METHODS

A retrospective study of all patients at a single institution who underwent cranioplasty after decompressive craniectomy and who underwent imaging of the head (computed tomography angiogram, magnetic resonance imaging with intravenous contrast, or diagnostic cerebral angiography) for any indication between the two procedures was undertaken. The degree of STA injury was classified and univariate statistics were used to compare groups.

RESULTS

Fifty-four patients met inclusion criteria. Thirty-three patients (61%) had evidence of complete or partial STA injury on pre-cranioplasty imaging. Nine patients (16.7%) developed either an SSI or wound complication after cranioplasty and, among these, four (7.4%) experienced delayed (>2 weeks from cranioplasty) complications. Seven of 9 patients required surgical debridement and cranioplasty explant. There was a stepwise but non-significant increase in post-cranioplasty SSI (STA present: 10%, STA partial injury: 17%, STA complete injury: 24%, P=0.53) and delayed post-cranioplasty SSI (STA present: 0%, STA partial injury: 8%, STA complete injury: 14%, P=0.26).

CONCLUSIONS

There is a notable but statistically non-significant trend toward increased rates of SSI in patients with complete or partial STA injury during craniectomy.

Abstract P204: Associations Between Dairy Intake and Serum Metabolites in Middle-Aged Adults in the U.S

Introduction: There is a lack of objective biomarkers of dietary intake. Untargeted studies can unbiasedly identify dairy biomarkers and inform the creation of robust dietary assessment tools that integrate questionnaire and biospecimen data.

Methods: Dairy products from interviewer-administered questionnaires were categorized as either low-fat or high-fat dairy. Total dairy was a composite of low-fat and high-fat dairy items. Linear regression models were used to assess associations between dairy intake and 360 serum metabolites in the Atherosclerosis Risk in Communities (ARIC) Study (n=3907). Significant associations were then tested for replication in the Bogalusa Heart Study (BHS) (n=819).

Results: In the ARIC study, 34 dairy-metabolite associations were identified (total dairy, n = 16; low-fat dairy, n = 10; high-fat dairy, n = 8). Total dairy shared 7 metabolic associations each with low-fat dairy and high-fat dairy. Low-fat dairy was associated with pantothenate, vitamin B5, and the catabolic product of vitamin B6, pyridoxate. High-fat dairy was associated with one amino acid, 3-hydroxy-2-ethylpropionate, and eight lipid metabolites, including myristate (14:0), 10-nonadecenoate (19:1n9), and myristoleate (14:1n5). Of the metabolites available for replication in BHS (total dairy, n = 15; low-fat dairy, n = 9; high-fat dairy, n = 8), 2 total dairy metabolites were replicated and 2 low-fat dairy metabolites were replicated ( Table ).

Conclusions: We identified metabolomic markers of total, low-fat, and high-fat dairy. Pantothenate, myristate (14:0), and tiglyl carnitine replicated across two large, diverse study populations, suggesting that they are markers of dairy consumption.

Abstract P304: Association of Epigenetic Age Acceleration With Cognition in the Bogalusa Heart Study

Background: Despite known associations of epigenetic age acceleration (EAA), or increased DNA methylation (DNAm)-based age relative to chronological age, with Alzheimer’s disease, few studies have investigated the relation of EAA with midlife cognitive function. We examined cross-sectional associations of EAA with cognition among the 1,252 middle-aged participants of the Bogalusa Heart Study 2013-2016 study visit.

Methods: Whole-blood DNA methylation data was generated using the Illumina HumanMethylation450 BeadChip. Four EAA measures, including extrinsic EAA (EEAA), intrinsic EAA (IEAA), PhenoAA and GrimAA, were derived from the methylation data. Cognitive function was assessed by a standard battery of eight neurocognitive tests covering five cognition domains, and a global cognition score was calculated. Associations of EAA measures with cognitive function were assessed by 3 multivariable models sequentially adding (i) demographics (age, sex, race, education) and vocabulary; (ii) lifestyle behaviors (smoking, alcohol drinking, and depression), and (iii) clinical measures (blood pressure, lipids, body mass index, glycated hemoglobin, medication, and white blood cell count.

Results: After Bonferroni correction (α=1.39E-3), PhenoAA and GrimAA were significantly associated with decreased processing speed (lower Digit coding test score) and decreased working memory (higher trail making test A score). GrimAA was also associated with lower global cognition score ( Table ). EEAA was associated with decreased processing speed (lower Digit coding test). After adjusting for lifestyle and clinical measures, such associations were slightly attenuated but remained at least nominally significant. IEAA was not associated with any cognitive test results.

Conclusions: EAA measured by PhenoAA, GrimAA, and EEAA were significantly associated with decreased processing speed, working memory, and/or global cognition. The associations were independent of known cognitive decline risk factors.

Clinical outcomes among distinct groups of patients with severe tricuspid valve regurgitation

Introduction

Severe tricuspid valve regurgitation (TR) is associated with increased 1-year morbidity and mortality. Characterization by valve etiology (primary, secondary, and lead-associated), a classification borrowed from mitral valve disease, has not been universally shown to correlate with outcomes.

Purpose

Among a large, racially diverse cohort with newly identified severe TR, we aimed to 1) characterize outcomes of severe TR by etiology, and 2) assess whether unsupervised phenoclustering or supervised outcome-driven prediction trees were more effective in establishing subgroups of TR with differential clinical risk profiles.

Methods

We retrospectively analyzed outcomes of 5-year all-cause death and a composite of death or heart failure hospitalization (HFH) among adult patients with new severe TR identified by echocardiography between 2007 to 2018 at a large academic tertiary referral center in the United States. Patients were initially categorized by etiology of TR, including primary, secondary, and lead-associated. Second, we separately applied unsupervised hierarchical clustering to identify distinct clusters using demographics, clinical, and echo data at the time of diagnosis. Third, we applied a supervised recursive partitioning algorithm (survival trees) by each outcome to identify distinct TR subgroups. We estimated the cumulative incidence of death and composite death or HFH over 5 years by 1) etiology of TR, 2) distinct clusters, and 3) groups identified by supervised learning (prediction trees).

Results

Among 2,379 consecutive patients with newly identified severe TR, the median age was 70 years, 61% were female, and 40% were Black. Event rates (95% CI) were 30.9 (29.0 to 32.8) events/100 PY for death and 49.0 (45.9 to 52.2) events/100 PY for composite death or HFH over median follow-up of 1.6 years. Event rates were similarly high across TR etiology groups for both death and composite death or HFH (Figure 1). Multiple methods of unsupervised clustering did not yield distinct clusters by patient demographic and imaging characteristics. After applying supervised survival tree modeling, four phenoclusters with distinct clinical prognoses were separately identified for death and composite death or HFH (Figure 2). Variables identified to partition the cohort to discriminate both death and composite death or HFH were age, albumin, blood urea nitrogen, right ventricular contractility, and right ventricular systolic pressure (all p&lt;0.05).

Conclusions

Five-year cumulative incidence of adverse events among patients with newly diagnosed severe TR was 69% for death and 80% for composite death or HFH. TR etiology did not stratify prognosis, while supervised survival tree models identified phenoclusters with distinct clinical risk. The identified subgroups of severe TR with differential outcomes offer insights towards enrichment in clinical trials of TR and risk/benefit analysis in patients undergoing TR therapies.

Funding Acknowledgement

Type of funding sources: Private company. Main funding source(s): Abbott

Polysomnography Following Traumatic Brain Injury: A Systematic Review and Meta-Analysis

Introduction

Sleep disturbances are common following traumatic brain injury (TBI) worsening morbidity and other neuropsychiatric symptoms. Post-TBI alterations in sleep architecture require further study.

Objectives

(1) To evaluate polysomnographic measures of sleep architecture in participants with history of TBI compared to controls and as meta-analyses of pooled means. (2) To evaluate effects of timing and severity of TBI on polysomnographic outcomes.

Methods

PRISMA compliant systematic review was conducted of MEDLINE, PsycINFO, EMBASE and Scopus. Inclusion criteria: 1) reporting polysomnography in the context of TBI and 2) operationalizing TBI using clear/formalized criteria. Data were pooled in random-effects meta-analyses with outcomes expressed as mean differences (MD).

Results

In participants with TBI, sleep was comprised of 19.39% REM sleep, 8.13% N1, 51.18% N2, and 17.53% N3, as determined by meta-analyses of single means. Total sleep time was reduced in chronic (>6 months) TBI compared to acute-intermediate TBI (<6 months) (p=0.01). Compared to controls, participants with TBI differed with increased N1 sleep (MD=0.64%; 95%CI=0.02,1.25; p=0.04), reduced sleep efficiency (MD=-1.65%; 95%CI=-3.18,-0.12; p=0.03), and reduced sleep latency on the multiple sleep latency test (MD=-5.90mins; 95%CI=-10.09,-1.72; p<0.01). On sub-group analyses, participants with mild TBI differed from controls with reduced total sleep time (MD=-29.22mins, 95%CI=-54.16,-4.27; p=0.02). Similarly, participants with acute-intermediate TBI exhibited increased sleep latency compared to controls (MD=8.96mins; 95%CI=4.07,13.85; p<0.01) and differed significantly from participants with chronic TBI (X2(1,N=608)=6.54; p=0.01).

Conclusions

Sleep architecture is altered following TBI with potential implications regarding functional outcomes and recovery. These alterations appear to differ based on severity of injury and time since injury.

Disclosure

No significant relationships.

Comparing Outcomes of COVID-19 vs NonCOVID-19 Lung Transplant Recipients on ECMO as a Bridge to Transplant

Purpose

Methods

Results

Conclusion

Crystal structure analysis of the biologically active drug mol-ecule riluzole and riluzolium chloride

An investigation into the crystallization, crystal structure and packing analysis of the biologically active drug mol­ecule riluzole and its derivative, the riluzolium chloride salt, has been carried out.

This study is an investigation into the crystal structure of the biologically active drug mol­ecule riluzole [RZ, 6-(tri­fluoro­meth­oxy)-1,3-benzo­thia­zol-2-amine], C₈H₅F₃N₂OS, and its derivative, the riluzolium chloride salt [RZHCl, 2-amino-6-(tri­fluoro­meth­oxy)-1,3-benzo­thia­zol-3-ium chloride], C₈H₆F₃N₂OS⁺·Cl⁻. In spite of repeated efforts to crystallize the drug, its crystal structure has not been reported to date, hence the current study provides a method for obtaining crystals of both riluzole and its corresponding salt, riluzolium hydro­chloride. The salt was obtained by grinding HCl with the drug and crystallizing the obtained solid from di­chloro­methane. The crystals of riluzole were obtained in the presence of l-glutamic acid and d-glutamic acid in separate experiments. In the crystal structure of RZHCl, the –OCF₃ moiety is perpendicular to the mol­ecular plane containing the riluzolium ion, as can be seen by the torsion angle of 107.4 (3)°. In the case of riluzole, the torsion angles of the four different mol­ecules in the asymmetric unit show that in three cases the tri­fluoro­meth­oxy group is perpendicular to the riluzole mol­ecular plane and only in one mol­ecule does the –OCF₃ group lie in the same mol­ecular plane. The crystal structure of riluzole primarily consists of strong N—H⋯N hydrogen bonds along with weak C—H⋯F, C—H⋯S, F⋯F, C⋯C and C⋯S inter­actions, while that of its salt is stabilized by strong [N—H]⁺⋯Cl⁻ and weak C—H⋯Cl⁻, N—H⋯S, C—H⋯F, C⋯C, S⋯N and S⋯Cl⁻ inter­actions.