Functional and structural analyses reveal that a dual domain sialidase protects bacteria from complement killing through desialylation of complement factors.

The complement system is the first line of innate immune defense against microbial infections. To survive in humans and cause infections, bacterial pathogens have developed sophisticated mechanisms to subvert the complement-mediated bactericidal activity. There are reports that sialidases, also known as neuraminidases, are implicated in bacterial complement resistance; however, its underlying molecular mechanism remains elusive. Several complement proteins (e.g., C1q, C4, and C5) and regulators (e.g., factor H and C4bp) are modified by various sialoglycans (glycans with terminal sialic acids), which are essential for their functions. This report provides both functional and structural evidence that bacterial sialidases can disarm the complement system via desialylating key complement proteins and regulators. The oral bacterium Porphyromonas gingivalis, a "keystone" pathogen of periodontitis, produces a dual domain sialidase (PG0352). Biochemical analyses reveal that PG0352 can desialylate human serum and complement factors and thus protect bacteria from serum killing. Structural analyses show that PG0352 contains a N-terminal carbohydrate-binding module (CBM) and a C-terminal sialidase domain that exhibits a canonical six-bladed ß-propeller sialidase fold with each blade composed of 3-4 antiparallel ß-strands. Follow-up functional studies show that PG0352 forms monomers and is active in a broad range of pH. While PG0352 can remove both N-acetylneuraminic acid (Neu5Ac) and N-glycolyl-neuraminic acid (Neu5Gc), it has a higher affinity to Neu5Ac, the most abundant sialic acid in humans. Structural and functional analyses further demonstrate that the CBM binds to carbohydrates and serum glycoproteins. The results shown in this report provide new insights into understanding the role of sialidases in bacterial virulence and open a new avenue to investigate the molecular mechanisms of bacterial complement resistance.

A pleiotropic role of sialidase in the pathogenicity of Porphyromonas gingivalis.

As one of the keystone pathogens of periodontitis, the oral bacterium Porphyromonas gingivalis produces an array of virulence factors, including a recently identified sialidase (PG0352). Our previous report involving loss-of-function studies indicated that PG0352 plays an important role in the pathophysiology of P. gingivalis. However, this report had not been corroborated by gain-of-function studies or substantiated in different P. gingivalis strains. To fill these gaps, herein we first confirm the role of PG0352 in cell surface structures (e.g., capsule) and serum resistance using P. gingivalis W83 strain through genetic complementation and then recapitulate these studies using P. gingivalis ATCC33277 strain. We further investigate the role of PG0352 and its counterpart (PGN1608) in ATCC33277 in cell growth, biofilm formation, neutrophil killing, cell invasion, and P. gingivalis-induced inflammation. Our results indicate that PG0352 and PGN1608 are implicated in P. gingivalis cell surface structures, hydrophobicity, biofilm formation, resistance to complement and neutrophil killing, and host immune responses. Possible molecular mechanisms involved are also discussed. In summary, this report underscores the importance of sialidases in the pathophysiology of P. gingivalis and opens an avenue to elucidate their underlying molecular mechanisms.

iSleepFirst: burnout, fatigue, and wearable-tracked sleep deprivation among residents staffing the medical intensive care unit.

PURPOSE: This study aimed to evaluate the relationship between sleep, burnout, and psychomotor vigilance in residents working in the medical intensive care unit (ICU). METHODS: A prospective cohort study of residents was implemented during a consecutive 4-week. Residents were recruited to wear a sleep tracker for 2 weeks before and 2 weeks during their medical ICU rotation. Data collected included wearable-tracked sleep minutes, Oldenburg burnout inventory (OBI) score, Epworth sleepiness scale (ESS), psychomotor vigilance testing, and American Academy of Sleep Medicine sleep diary. The primary outcome was sleep duration tracked by the wearable. The secondary outcomes were burnout, psychomotor vigilance (PVT), and perceived sleepiness. RESULTS: A total of 40 residents completed the study. The age range was 26-34 years with 19 males. Total sleep minutes measured by the wearable decreased from 402 min (95% CI: 377-427) before ICU to 389 (95% CI: 360-418) during ICU (p < 0.05). Residents overestimated sleep, logging 464 min (95% CI: 452-476) before and 442 (95% CI: 430-454) during ICU. ESS scores increased from 5.93 (95% CI: 4.89, 7.07) to 8.33 (95% CI: 7.09,9.58) during ICU (p < 0.001). OBI scores increased from 34.5 (95% CI: 32.9-36.2) to 42.8 (95% CI: 40.7-45.0) (p < 0.001). PVT scores worsened with increased reaction time while on ICU rotation (348.5 ms pre-ICU, 370.9 ms post-ICU, p < 0.001). CONCLUSIONS: Resident ICU rotations are associated with decreased objective sleep and self-reported sleep. Residents overestimate sleep duration. Burnout and sleepiness increase and associated PVT scores worsen while working in the ICU. Institutions should ensure resident sleep and wellness checks during ICU rotation.

A Concise Review on the Potential Applications of Rugulopteryx okamurae Macroalgae.

The brown macroalgae of the species Rugulopteryx okamurae has reached European waters and the Strait of Gibraltar as an invasive species. The proliferation and colonization of the species in subtidal and intertidal zones of these regions imposes significant threats to local ecosystems and additionally represents a significant socioeconomic burden related to the large amounts of biomass accumulated as waste. As a way to minimize the effects caused by the accumulation of algae biomass, investigations have been made to employ this biomass as a raw material in value-added products or technologies. The present review explores the potential uses of R. okamurae, focusing on its impact for biogas production, composting, bioplastic and pharmaceutical purposes, with potential anti-inflammatory, antibacterial and α-glucosity inhibitory activities being highlighted. Overall, this species appears to present many attributes, with remarkable potential for uses in several fields of research and in various industries.

Risk Factors and Outcomes of Hospitalized Patients With Severe Coronavirus Disease 2019 (COVID-19) and Secondary Bloodstream Infections: A Multicenter Case-Control Study.

BACKGROUND: Coronavirus disease 2019 (COVID-19) has become a global pandemic. Clinical characteristics regarding secondary infections in patients with COVID-19 have been reported, but detailed microbiology, risk factors, and outcomes of secondary bloodstream infections (sBSIs) in patients with severe COVID-19 have not been well described. METHODS: We performed a multicenter case-control study including all hospitalized patients diagnosed with severe COVID-19 and blood cultures drawn from 1 March 2020 to 7 May 2020 at 3 academic medical centers in New Jersey. Data collection included demographics, clinical and microbiologic variables, and patient outcomes. Risk factors and outcomes were compared between cases (sBSI) and controls (no sBSI). RESULTS: A total of 375 hospitalized patients were included. There were 128 sBSIs during the hospitalization. For the first set of positive blood cultures, 117 (91.4%) were bacterial and 7 (5.5%) were fungal. Those with sBSI were more likely to have altered mental status, lower mean percentage oxygen saturation on room air, have septic shock, and be admitted to the intensive care unit compared with controls. In-hospital mortality was higher in those with an sBSI versus controls (53.1% vs 32.8%, P = .0001). CONCLUSIONS: We observed that hospitalized adult patients with severe COVID-19 and sBSI had a more severe initial presentation, prolonged hospital course, and worse clinical outcomes. To maintain antimicrobial stewardship principles, further prospective studies are necessary to better characterize risk factors and prediction modeling to better understand when to suspect and empirically treat for sBSIs in severe COVID-19.

Techniques for Patient Positioning During Burn Surgery: A Systematic Review.

INTRODUCTION: Patient positioning in the operating room remains a challenge for burn surgeons; burn surgery involves critically ill patients who require close monitoring, difficult exposures, and careful handling of grafted areas. Various techniques to optimize intraoperative positioning during burn surgery have been described in the literature. The aim of this review was to outline these positioning techniques and report on their complications. METHODS: A systematic review was performed by 2 independent reviewers using PubMed, Scopus, and OvidSP MEDLINE databases. Articles were included if they described intraoperative techniques to position patients undergoing burn surgery. The primary variable of interest was complications related to positioning during surgery. RESULTS: The search identified 1855 nonduplicate citations, of which 29 underwent full-text review, and 10 met inclusion criteria. Three studies described overhead suspension techniques, including a hook-and-pulley system, ceiling chains, weighted IV poles, and mounted crossbars; no complications were reported. Six studies described limb fixation techniques, including Steinmann pins, finger traps, wrist/ankle wraps, towel clips through eschar or distal phalanges, and external fixators. Complications included one case of hardware failure of external fixation and several pin site infections. Four studies described table modification techniques, including a modified Stryker frame, a fracture table, the Mayfield headrest, and the recliner position; no complications were reported. DISCUSSION: Numerous techniques have been described to improve patient positioning during burn surgery. No major complications were identified in this systematic review. Most techniques use standard operating room equipment and can aid in safe and easier operations.

The State of Burn Care Training During Plastic Surgery Residency.

INTRODUCTION: There is an ongoing shortage of burn specialists, and workforce reports suggest possible hurdles attracting plastic surgeons into burn care. The purpose of this study was to (1) determine the state of burn care in plastic surgery residency and (2) identify what barriers might exist for plastic surgeons pursuing a practice that involves burn care. METHODS: Surveys were distributed to North American plastic surgery program directors and residents, respectively, during the 2018-2019 academic year. RESULTS: Fifty-eight program directors (response, 54%) and 320 plastic surgery residents (response, 30%) participated. Burn care was felt to be an important component in training by most program directors (USA, 88%; Canada, 100%) and residents (USA, 87%; Canada, 99%). The majority of program directors included a burn unit rotation (USA, 88%; Canada, 90%). Rotations for integrated residents averaged 2.5 months and most commonly occurred during second year; independent residents spent 1.2 months on rotation, usually in first year. Three-quarters of American residents were interested in a career that involves burn care in some capacity, primarily burn reconstruction (40%). Factors that would discourage a trainee from practicing burn care in the future included the nature of burn care (60%) and burn operations (45%), the on-call commitment (39%), and a narrow scope of practice (38%). DISCUSSION: This study challenges the belief that plastic surgery trainees are disinterested in burn care. Burn surgery remains an important component of training programs, and we propose several steps to encourage greater interest and participation in the burn surgery workforce.

Aggregation of ferrihydrite nanoparticles: Effects of pH, electrolytes,and organics.

To better understand the fate and transport of ferrihydrite nanoparticles (FNPs), which carry many contaminants in natural and engineered aquatic environments, the aggregation of FNPs was systematically investigated in this study. The pH isoelectric point (pHIEP), surface zeta potential, and particle size evolutions of FNPs were measured under varied aqueous conditions using dynamic light scattering (DLS). The influence of pH (5.0 ±â€¯0.1 and 7.0 ±â€¯0.1), ionic strength (IS), electrolytes (NaCl, CaCl2 and Na2SO4), and organics (humic acid, fulvic acid and CH3COONa) on the aggregation behaviors of FNPs were explored. Meanwhile, Derjaguin-Landau-Verwey-Overbeek (DLVO) theory was employed to better understand the controlling mechanisms of FNP aggregation. In the presence of sulfate, the surface charge of FNPs was neutralized under varied pH and ionic strength due to ion adsorption and FNPs phase transformation to schwertmannite based on FT-IR results. This phase transformation resulted in rapid aggregation in all water chemistries tested, whereas other salt species affected the aggregation primarily by ion adsorption and charge screening. Presence of increasing concentrations of the organic acids significantly shifted the pHIEP of FNPs (7.0 ±â€¯0.2) to lower pH (< 4.0) due to adsorption of organics on FNPs surfaces making them negatively charged. The adsorption of HA/FA inhibited FNP aggregation significantly while CH3COONa did not, due to different effects on steric and/or electrosteric interactions among FNPs by organics with varied pKa values and molecular weights. After accounting for the important effects of pH, electrolytes, and organics in modifying FNPs' surface charge, DLVO calculations agreed well with measured critical coagulation concentrations (CCC) values of FNPs at both pH 5.0 ±â€¯0.1 and 7.0 ±â€¯0.1 in the presence of NaCl. This study will hence be useful to better predict and control the fate and transport of FNPs in the presence of electrolytes and organics with different molecular weights, as well as the fate of the associated contaminants in natural and engineered systems.

The role of collagenase ointment in acute burns: a systematic review and meta-analysis.

OBJECTIVE:: A systematic review and meta-analysis was performed to summarise the state of the literature in regard to the efficacy and uses of clostridial collagenase ointment (CCO) in the burn patient. METHOD:: A systematic review of articles available on PubMed, Scopus and OvidSP Medline was performed. Keywords used in the search process included burns, thermal injury, collagenase, enzymatic debridement, wound care. Reviews, case reports, independent abstracts, consensus and opinion papers were excluded. A meta-analysis was performed for articles fitting inclusion criteria. RESULTS:: Following screening, six relevant articles were identified for systematic review. Few studies, with limited sample sizes, argue that CCO may be an effective debriding agent. It may also accelerate wound healing and avoid the pain associated with mechanical debridement. CCO lacks antimicrobial activity but the risk of burn wound infection does not appear to be significantly different than when using silver-impregnated products. CCO is more expensive than traditional wound care products but may help halt burn depth conversion and prevent the need for surgery. CONCLUSION:: CCO may be a safe and effective debridement agent for burn wounds with respect to decreasing wound healing time and minimising pain without increasing the risk of infection. It should be used on a case-by-case basis due to its financial cost, which may be offset by its ability to manage burns non-operatively.

Accuracy of blinded clinician interpretation of single-lead smartphone electrocardiograms and a proposed clinical workflow.

Despite the appeal of smartphone-based electrocardiograms (ECGs) for arrhythmia screening, a paucity of data exists on the accuracy of primary care physicians' and cardiologists' interpretation of tracings compared with the device's automated diagnosis. Using 408 ECGs in 51 patients, we demonstrate a variable accuracy in clinician interpretation of smartphone-based ECGs, with only cardiologists demonstrating satisfactory agreement when referenced against a 12-lead ECG. Combining the device automated diagnostic algorithm with cardiologist interpretation of only uninterpretable traces yielded excellent results and provides an efficient, cost-effective workflow for the utilization of a smartphone-based ECG in clinical practice.

Abaloparatide: Review of a Next-Generation Parathyroid Hormone Agonist.

OBJECTIVE: To review the efficacy, safety, and economics of abaloparatide in the treatment of postmenopausal osteoporosis. DATA SOURCES: PubMed (1966 to October 2017), Clinicaltrials.gov (October 2017), and Scopus (1970 to October 2017) were searched using abaloparatide, Tymlos, BA058, PTHrP 1-34 analog, and parathyroid hormone-related peptide 1-34 analog. STUDY SELECTION AND DATA EXTRACTION: Human studies published in peer-reviewed publications in English were the primary sources for efficacy, safety, and economic data. DATA SYNTHESIS: In the 2 randomized, published clinical studies of 24 weeks and 18 months duration, bone mineral density changes were higher for abaloparatide (lumbar spine, 6.7%-11.2%; femoral head, 3.1%-3.2%; total hip, 2.6%-4.2%) compared with placebo (lumbar spine, 0.6%-1.6%; femoral head, -0.4% to 0.8%; total hip, -0.1% to 0.4%; P < 0.05) and compared with teriparatide in the 24-week study (total hip 2.6% vs +0.5%, P < 0.05). New vertebral and nonvertebral fractures occurred in 0.6% and 2.7% of patients on abaloparatide compared with 4.2% and 4.7% on placebo in the 18-month study ( P < 0.05). Abaloparatide appears to have a somewhat higher risk for adverse effects, discontinuation as a result of adverse effects, and serious or severe adverse effects than teriparatide, but teriparatide has a higher risk for hypercalcemia. Pharmacoeconomic modeling appears to favor abaloparatide if differences in efficacy and cost are maintained. CONCLUSION: Abaloparatide, which has less effect on osteoclasts, is an alternative to teriparatide in patients with postmenopausal osteoporosis who are at high risk for fractures or who have failed antiresorptive therapy based on initial clinical studies and economic modeling.

Evidence for formation of DNA repair centers and dose-response nonlinearity in human cells.

The concept of DNA "repair centers" and the meaning of radiation-induced foci (RIF) in human cells have remained controversial. RIFs are characterized by the local recruitment of DNA damage sensing proteins such as p53 binding protein (53BP1). Here, we provide strong evidence for the existence of repair centers. We used live imaging and mathematical fitting of RIF kinetics to show that RIF induction rate increases with increasing radiation dose, whereas the rate at which RIFs disappear decreases. We show that multiple DNA double-strand breaks (DSBs) 1 to 2 µm apart can rapidly cluster into repair centers. Correcting mathematically for the dose dependence of induction/resolution rates, we observe an absolute RIF yield that is surprisingly much smaller at higher doses: 15 RIF/Gy after 2 Gy exposure compared to approximately 64 RIF/Gy after 0.1 Gy. Cumulative RIF counts from time lapse of 53BP1-GFP in human breast cells confirmed these results. The standard model currently in use applies a linear scale, extrapolating cancer risk from high doses to low doses of ionizing radiation. However, our discovery of DSB clustering over such large distances casts considerable doubts on the general assumption that risk to ionizing radiation is proportional to dose, and instead provides a mechanism that could more accurately address risk dose dependency of ionizing radiation.

Combining scar-modulating agents for the treatment of hypertrophic scars and keloids: A systematic review.

Injury to the skin can cause abnormal wound healing and continuous inflammation that leads to the formation of hypertrophic scars and keloids. These lesions often cause significant negative impact on a patient's life due to aesthetic, physical, social, and psychological consequences. Numerous treatment modalities exist for these hypertrophic scars and keloids, which include silicone sheeting, pressure garments, intralesional injection/topical application of scar-modulating agents, laser therapy, and surgical excision. Due to increased efficacy, an evolving treatment paradigm encourages the use of multiple treatment modalities instead of one treatment modality. However, no gold standard treatment exists for these lesions, leaving many people with unsatisfactory results. Adding scar-modulating agents such as 5-Fluorouracil, bleomycin, or Botulinum Toxin A to triamcinolone monotherapy has emerged as a potential drug combination for treating hypertrophic scars and keloids. We sought to critically analyze the evidence that exists for the use of more than one scar-modulating agent. This was done by conducting a systematic review to determine the efficacy of these combined drug regimens. We found that many of these combinations show evidence of increased efficacy and fewer/similar adverse events to triamcinolone monotherapy. Triamcinolone and 5-Fluorouracil showed the strongest and most consistent evidence out of all combinations. With this review, we intend to encourage more research into unique drug combinations that may improve outcomes for patients with symptomatic hypertrophic scars or keloids.

Behavioral KSA Intervention Class to Boost Positive Airway Pressure Adherence Among Active Duty Military Personnel With Obstructive Sleep Apnea.

INTRODUCTION: Obstructive sleep apnea (OSA) is a treatable cause of daytime sleepiness and associated medical problems that can negatively impact soldier readiness and performance. This study examined adherence to positive airway pressure (PAP) by soldiers who were newly diagnosed with OSA and prescribed PAP therapy and participated in a Knowledge, Skills, and Attitudes (KSA) behavioral intervention class. MATERIALS AND METHODS: The KSA was a one-time, interactive 90-minute class attended by up to 10 patients per class. PAP adherence was examined using Medicare standard at 30-, 60-, 90-, and 180 days post class. The analytic sample comprised 379 active duty patients (93% men; mean age 40.21 ± 8.06) categorized into 3 groups: KSA (n = 235), did not show (DNS; n = 61), and mandatory education class (MEC; n = 83). The MEC group comprised patients from an education class in a previous year. RESULTS: Baseline scores on the apnea hypopnea index, body mass index, sleepiness, insomnia severity, and age were non-significant among the 3 groups. At 30 days, significantly more patients in KSA (48%) and MEC (51%) were adherent than the DNS group (16%). At 60 days, the adherence rates for the KSA, DNS, and MEC were significantly different at 39%, 22%, and 27%, respectively. At 90- and 180 days, the adherence rates among the KSA, DNS, and MEC groups did not differ significantly at 34%, 17%, and 26% (90 days) and 34%, 27%, and 25% (180 days), respectively. Consistently, more patients in KSA were adherent than those in DNS and MEC, except at 30 days. Additionally, adherence rates for KSA intervention declined more gradually over the 6 month period. The mean PAP usage on nights used was 4.6 hours that computed to a 34% non-use rate based on an optimal 7-hour/night sleep time. CONCLUSION: KSA could be a behavioral intervention that enhances PAP adherence with a booster session implemented at the 90 days mark.

Predictors of Positive Airway Pressure Therapy Adherence Among U.S. Active Duty Military Personnel With Obstructive Sleep Apnea.

INTRODUCTION: Obstructive sleep apnea (OSA) is prevalent among U.S. military personnel, but adherence to positive airway pressure (PAP) treatment is suboptimal. This study sought to identify factors that predict the adherence to PAP therapy of active duty military patients newly diagnosed with OSA. MATERIALS AND METHODS: The study was a retrospective cross-sectional analysis of 239 active duty military patients (94% men, mean age 40.0 ± 7.8 years), who were admitted into PAP therapy and participated in a single 90-minute behavioral intervention session. The session included a self-assessment of sleep trouble, sleep distress, impact of sleep on functioning, emotional difficulty from sleep, stress appraisal, and beliefs about OSA and PAP. PAP usage data of the patients were analyzed at 30-, 60-, and 180 days post-intervention using descriptive statistics and multivariable linear regression analysis. RESULTS: Positive airway pressure adherence of at least 4 hours nightly usage decreased slightly over the course of the study; mean number of days used over a 30-day timeframe at the 30-, 60-, and 180-day mark were 15.6, 14.9, and 14.1 days, respectively. On nights used, PAP usage remained consistent at 4.8 to 5.0 hours over the 30-, 60-, and 180-day mark. Age, apnea-hypopnea index, readiness, self-efficacy or confidence in treatment implementation, and worries about sleep were statistically significant predictors of adherence. Furthermore, worries about sleep negatively affected PAP usage hours on nights used, regardless of meeting adherence criterion, in the early phase of treatment and in the long run at the 180-day mark. CONCLUSIONS: Readiness for therapy, self-efficacy, confidence in putting into action the treatment plan, and worries about sleep are modifiable variables that may be targeted in programs to boost PAP adherence and usage among the military population. Future studies should explore the predictive aspects of each of these variables and identify interventions to improve them.

Lower Admission Prealbumin and Albumin Levels in Unhoused Burn Patients Is a Marker for Poorer Outcomes.

Unhoused (UH) individuals experience burn injuries at a higher rate than domiciled individuals, and have poorer outcomes following injuries. One such mechanism proposed for worsened outcomes is secondary to poor nutrition. Access to proper nutrition and food insecurity are major barriers. Malnutrition has been shown to decrease wound tensile strength, increase infection rates, and prolong healing. The purpose of this study was to understand if albumin and prealbumin could help determine outcomes in UH patients and identify at-risk patients earlier in their hospital course. A retrospective chart review was conducted of UH patients from 2015 through 2023 at a large urban safety net hospital. Data collected included admission laboratory values including albumin and prealbumin. Outcomes studied included length of stay (LOS), Intensive Care Unit (ICU) days, ventilator days, and mortality. Data analysis for the effect of albumin and prealbumin included a zero-truncated negative binomial model for LOS, a negative binomial hurdle model for ICU LOS and ventilator days, and logistic regression for mortality. Three hundred and eighty-five patients met inclusion criteria and of these, 366 had albumin and 361 had prealbumin information. Adjusting for age, gender, and total body surface area, the fewest days in the hospital and lowest odds of admission to the ICU occurred for those with admission albumin values of approximately 3.4-3.5 g/dL. Each unit (g/dL) decrease in albumin was associated with 3.19 times the odds of death (95% CI: 1.42, 7.69). Each unit (mg/dL) decrease in prealbumin was associated with 1.19 times the odds of death (95% CI: 1.06, 1.35). Decreased admission albumin and prealbumin levels are associated with worse burn outcomes in UH patients. These nutritional biomarkers may aid in determining which UH patients are suffering from food insecurity at injury onset. Obtaining these values on admission may help burn providers target nutritional goals in their most vulnerable patients.

Assessing Scar Outcomes Using Objective Scar Measurement Tools: An Adjunct to Validated Scar Evaluation Scales.

BACKGROUND: The assessment of scar outcomes is important to both patient care and research focused on understanding the results of medical and surgical interventions. The Vancouver Scar Scale (VSS) and Patient and Observer Scar Assessment Scale (POSAS) are validated and simple instruments to assess scars. However, these subjective scales have shortcomings. The VSS fails to capture patient perception and has indeterminate validity and reliability. The POSAS captures patient perception, but the observer scale has been shown to have moderate amounts of interrater variability. Studies highlighting the ability of objective scar assessment tools to produce reliable and reproducible results are needed. In this study, the authors aimed to validate the use of the FibroMeter, ElastiMeter, and SkinColorCatch as objective adjuncts in the assessment of hypertrophic scar and keloid outcomes. METHODS: In this prospective single-center study, scars were assessed using the VSS, the POSAS, and the objective study tools (FibroMeter, ElastiMeter, and SkinColorCatch). Correlations between the different methods of scar assessment were measured. RESULTS: The FibroMeter and SkinColorCatch showed significant correlations with the VSS total and the observer POSAS total. The ElastiMeter showed significant correlations with both the patient and observer POSAS totals. Unexpected correlations between ElastiMeter measurements and the vascularity or pigmentation of scars indicate that scoring of these categories may be influenced by how severe the scar looks to the observer subjectively, underscoring the need for reliable objective scar assessment tools. CONCLUSION: The results highlight the ability of the FibroMeter, ElastiMeter, and SkinColorCatch to assess scars, and demonstrate their potential in serving as important adjuncts to previously validated scar assessment scales.

Anthropogenic particles determination in northern krill (Meganyctiphanes norvegica) from the Azores region: A keystone species for marine food webs.

Plastic pollution poses a significant threat to marine ecosystems. Microfibres from fabrics have become the most prevalent shape of microplastic found in the marine environment. The northern krill (Meganyctiphanes norvegica) is the most abundant euphausiid species in the northern hemisphere, playing a crucial role in various pelagic ecosystems. Anthropogenic microparticles in northern krill was assessed for the first time in samples collected in the Azores on two occasions - April 2019 (n = 480) and April 2023 (n = 480). Analysis of all individuals revealed 533 anthropogenic particles, with an average abundance of 0.56 ± 0.14 items per individual and, no significant differences between years. Microfibres were the most common shape (94.8 %), with the remaining items being fragments (5.2 %), and blue and black were the predominant colours. MicroFourier transform infrared spectroscopy analysis (µFTIR) of 22.1 % of the total number of particles, showed that they were mainly cellulosic (65.3 %) - either natural or semisynthetic - followed by polyester (7.6 %). Our finding of microplastics in the northern krill raises important questions due to its crucial role in marine food webs. The intake of anthropogenic particles, particularly those that are 100 % synthetic, suggests that the northern krill may act as a transfer vector of these pollutants to higher trophic levels.

Outcomes of Patients Receiving Proximal Row Carpectomy and Meniscus Interposition Allografts for the Treatment of End-Stage Wrist Arthritis: A Comparative Study.

BACKGROUND: Proximal row carpectomy (PRC) is a mainstay of wrist arthritis treatment; however, it is traditionally contraindicated in patients with an affected capitate. The use of soft tissue interposition grafts to resurface the radiocapitate articulation has been previously described to allow for PRC in these patients. In the current study, we reviewed our outcomes using knee meniscus allograft interposition to resurface the radiocapitate articulation in patients who would have otherwise been contraindicated for PRC. METHODS: A retrospective study of patients who underwent PRC with or without meniscus interposition arthroplasty was performed from 2011 to 2022. Patient demographics (age, sex, occupation, hand dominance, etc) were collected. Improvement in pain was the primary outcome. Wrist range of motion and reconstructive failure requiring fusion were the secondary outcomes. RESULTS: We identified a total of 83 patients and 43 met the inclusion criteria. Fifteen patients (35%) underwent PRC with meniscus interposition arthroplasty, and 28 patients (65%) underwent PRC alone. Patients with and without meniscus interposition arthroplasty had documented improvement in pain postoperatively (93% vs 95%, P > .05) at a median follow-up time of 11 (range, 3-38 months) and 9 months (range, 3-64 months), respectively. Postoperative wrist range of motion (flexion: +9 vs -4, P > .05, extension: +12 vs -4, P = .10) trended toward increase in patients undergoing meniscus interposition arthroplasty compared with PRC alone. CONCLUSIONS: Our short- to mid-term outcomes in patients with end-stage wrist arthritis affecting the capitate who undergo PRC and meniscus interposition arthroplasty are comparable with those receiving PRC alone.