The Latrobe Smoking Support Service: A quantitative study of participants in a regional area.

Background and Aims: More than 70% of current smokers in Australia have a definite plan to stop smoking and around half of them try to quit every year. Latrobe Community Health Service (LCHS) was commissioned by Gippsland Primary Health Network to establish Latrobe Smoking Support Service (LSSS) to break down barriers to accessing services and increase support for smoking cessation. This research aims to assess the feasibility of an ongoing smoking cessation support service and determine the effect the LSSS has on client smoking behavior. Methods: Quantitative data were collected for the LSSS situated at LCHS during the period from September 2021 to March 2022. A new client survey, a returning client survey, and a 6-week follow-up survey were conducted by Clinic staff. The consent forms were obtained from the clients. A total of 117 clients attended the LSSS at least once, and a further 315 returning client sessions were conducted. The data analysis was undertaken by means of various descriptive and inferential statistical techniques, such as multiple linear regression analysis. Results: The research findings demonstrate the strong positive effect of the LSSS in helping clients to change their smoking behavior. Results of multiple regression analysis highlight the significant role of behavioral intervention strategies in the LSSS's success. A combination of both nicotine replacement therapy (NRT) and counseling was a key contributor to the project's success. Conclusion: This research proposed and tested the model of a smoking cessation support service that combines a comprehensive mix of services for smokers including free NRT, free counseling, and ongoing support of counselors or/and nurse practitioners.

Attitudes of women towards intimate partner violence in Guyana: A cross-sectional analytical study.

BACKGROUND: To assess the attitudes of women towards intimate partner violence (IPV) in Guyana. METHODS: We used national data from the publicly available Multiple Indicator Cluster Survey (MICS) conducted in Guyana in 2019 for women aged 15 to 49 years. The prevalence of women who agreed that a husband is justified in beating his wife was analyzed. Respondent reasons included if she: "goes out without telling him", "neglects the children", "argues with him", "refuses sex with him", "burns the food", "has another partner", "stays out late/partying", "refuses to cook or clean", "overspends", and/or "he doesn't have access to her cellphone". Descriptive analyses were carried for all the variables. Logistic regression was used to identify factors associated with these 10 respondent reasons, separately and in combination. RESULTS: The overall prevalence of women's attitudes justifying IPV against women if there was a 'yes' response to any of the 10 reasons was 17.9% (95%CI: 16.6-19.3%), and varied from 2.7% if she "goes out without telling him", "burns the food", or "overspends" to 10.0% if she "has another partner". This prevalence ranged from 10.2% in urban areas to 19.3% in rural areas (p<0.001), and from 16.1% in coastal to 30.1% in interior areas (p<0.001). Similarly, 25.9% of women from the poorest household agreed that a husband has the right in beating his wife for any of the 10 reasons compared to 11.6% of the richest women (11.6%) (p<0.001). Rural place of residence, ethnicity, geographic region, level of education, wealth quintile, ever used of a computer, and frequency of listening to the radio were significant factors associated with women's attitudes justifying IPV against women (p<0.05). CONCLUSION: Over one-sixth of the respondents agreed that a husband was justified in committing IPV against women in Guyana. Public health programs focusing on geographic locations, ethnicity, and economic status must be implemented to change attitudes justifying IPV and reduce this significant public health challenge.

TREM1 disrupts myeloid bioenergetics and cognitive function in aging and Alzheimer disease mouse models.

Human genetics implicate defective myeloid responses in the development of late-onset Alzheimer disease. A decline in peripheral and brain myeloid metabolism, triggering maladaptive immune responses, is a feature of aging. The role of TREM1, a pro-inflammatory factor, in neurodegenerative diseases is unclear. Here we show that Trem1 deficiency prevents age-dependent changes in myeloid metabolism, inflammation and hippocampal memory function in mice. Trem1 deficiency rescues age-associated declines in ribose 5-phosphate. In vitro, Trem1-deficient microglia are resistant to amyloid-ß42 oligomer-induced bioenergetic changes, suggesting that amyloid-ß42 oligomer stimulation disrupts homeostatic microglial metabolism and immune function via TREM1. In the 5XFAD mouse model, Trem1 haploinsufficiency prevents spatial memory loss, preserves homeostatic microglial morphology, and reduces neuritic dystrophy and changes in the disease-associated microglial transcriptomic signature. In aging APPSwe mice, Trem1 deficiency prevents hippocampal memory decline while restoring synaptic mitochondrial function and cerebral glucose uptake. In postmortem Alzheimer disease brain, TREM1 colocalizes with Iba1+ cells around amyloid plaques and its expression is associated with Alzheimer disease clinical and neuropathological severity. Our results suggest that TREM1 promotes cognitive decline in aging and in the context of amyloid pathology.

Understanding the capacity of children with congenital unilateral below-elbow deficiency to actuate their affected muscles.

In recent years, commercially available dexterous upper limb prostheses for children have begun to emerge. These devices derive control signals from surface electromyography (measure of affected muscle electrical activity, sEMG) to drive a variety of grasping motions. However, the ability for children with congenital upper limb deficiency to actuate their affected muscles to achieve naturalistic prosthetic control is not well understood, as compared to adults or children with acquired hand loss. To address this gap, we collected sEMG data from 9 congenital one-handed participants ages 8-20 years as they envisioned and attempted to perform 10 different movements with their missing hands. Seven sEMG electrodes were adhered circumferentially around the participant's affected and unaffected limbs and participants mirrored the attempted missing hand motions with their intact side. To analyze the collected sEMG data, we used time and frequency domain analyses. We found that for the majority of participants, attempted hand movements produced detectable and consistent muscle activity, and the capacity to achieve this was not dissimilar across the affected and unaffected sides. These data suggest that children with congenital hand absence retain a degree of control over their affected muscles, which has important implications for translating and refining advanced prosthetic control technologies for children.

Moving a missing hand: children born with below elbow deficiency can enact hand grasp patterns with their residual muscles.

Children with a unilateral congenital below elbow deficiency (UCBED) have one typical upper limb and one that lacks a hand, ending below the elbow at the proximal/mid forearm. UCBED is an isolated condition, and affected children otherwise develop normal sensorimotor control. Unlike adults with upper limb absence, the majority of whom have an acquired loss, children with UCBED never developed a hand, so their residual muscles have never actuated an intact limb. Their ability to purposefully modulate affected muscle activity is often assumed to be limited, and this assumption has influenced prosthetic design and prescription practices for this population as many modern devices derive control signals from affected muscle activity. To better understand the motor capabilities of the affected muscles, we used ultrasound imaging to study 6 children with UCBED. We examined the extent to which subjects activate their affected muscles when performing mirrored movements with their typical and missing hands. We demonstrate that all subjects could intentionally and consistently enact at least five distinct muscle patterns when attempting different missing hand movements (e.g., power grasp) and found similar performance across affected and typically developed limbs. These results suggest that although participants had never actuated the missing hand they could distinctively and consistently activate the residual muscle patterns associated with actions on the unaffected side. These findings indicate that motor control still develops in the absence of the normal effector, and can serve as a guide for developing prostheses that leverage the full extent of these children's motor control capabilities.

Indigenous experiences and underutilisation of disability support services in Australia: a qualitative meta-synthesis.

Purpose: Aboriginal and Torres Strait Islander People with a disability continue to experience barriers to service engagement such as mistrust of government services, lack of culturally appropriate support, marginalisation and disempowerment. This meta-synthesis reviews current literature regarding these experiences to explain why services are underutilised.Methods: The meta-synthesis was conducted using a meta-ethnographic approach to synthesise existing studies into new interpretive knowledge. The approach was supported by a search using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA).Results: Ten original research papers utilising a qualitative methodology were extracted. Synthesis of the articles revealed four concepts that were developed into a conceptual model. These include:1) History Matters; 2) Cultural Understanding of Disability Care; 3) Limitations to Current Service Provision; and 4) Delivery of Effective Services.Conclusions: Disability services do not adequately consider the cultural needs of Aboriginal and Torres Strait Islander People or communicate in a culturally appropriate manner. There are expectations that Aboriginal and Torres Strait Islander People acknowledge their disability in alignment with western definitions of disability in order to access services. More work is needed to align disability services with culturally appropriate support to provide better health outcomes.Implications for RehabilitationAboriginal and Torres Strait Islander people with a disability continue to experience barriers to service engagement which must be addressed.An essential gap that must be filled in providing disability services to Aboriginal and Torres Strait Islander people is the acknowledgment of culture as a resolute influence on all client interactions with providers.A cultural model of disability may better align with the experiences of Aboriginal and Torres Strait Islander people than current medical and social models used in healthcare.Disability services need to align better with culturally appropriate support to provide better health outcomes for Aboriginal and Torres Strait Islander people.

Neuromuscular Dysfunction in Clubfeet Associated With Constriction Band Syndrome.

INTRODUCTION: Constriction band syndrome (CBS) is a congenital limb anomaly frequently associated with clubfoot. Clubfeet in CBS patients may be associated with peroneal nerve dysfunction in the involved lower extremity; however, the etiology of this neuromuscular dysfunction is not clear. We sought to characterize the distribution of constriction bands on lower extremities with clubfoot and determine if neuromuscular deficit (NMD), defined here as having absent ankle dorsiflexion, was associated with ipsilateral proximal bands. Our secondary aim was to compare the treatment and outcomes of clubfeet with NMD to those without NMD. METHODS: We performed a retrospective review of all patients with CBS and clubfoot presenting to our facility between January 1, 1998 and December 31, 2018. Treatment with the Ponseti method, at least 1 year of follow-up at this facility, and a detailed physical exam describing lower extremity neuromuscular function and the presence and location of constriction bands were required for inclusion in the study cohort. RESULTS: Twenty children with 26 clubfeet were included. Forty-six percent (12/26) of the clubfeet had NMD. Clubfeet with and without NMD had ipsilateral thigh or leg constriction bands at similar rates [42% (5/12) vs. 43% (6/14), P =0.106], and the majority (7/12) of clubfeet with NMD did not have an ipsilateral thigh or leg band. While children with an NMD clubfoot tended toward more casts, relapses, and surgical procedures, these differences did not reach statistical significance. The use of a daytime AFO beyond age four was higher in the NMD clubfeet [58% (7/12) vs. 14% (2/14), P =0.04]. CONCLUSION: Clubfeet with neuromuscular deficits may occur in the absence of proximal ipsilateral constriction bands, suggesting they may be caused by mechanisms other than direct damage from visible constriction bands to underlying nerves. They can also coexist with arthrogrypotic conditions. Clubfeet with an NMD tended toward more casts, relapses, and surgeries than those without NMD, but these differences did not reach statistical significance. These patients often elect long-term use of a daytime AFO.

The Green Transfer-Long-Term Results.

PURPOSE: The purpose of this study was to determine the long-term results of the Green transfer (flexor carpi ulnaris to extensor carpi radialis brevis) for patient-reported outcomes, wrist position, and range of motion. METHODS: We re-examined 13 patients from a previous prospective study involving surgery for hemiplegia that included a Green transfer. The average follow-up was 8 years with the range from 5 to 11 years. The wrist range of motion and the postoperative position of the wrists were measured. The surgical outcomes were measured via the Pediatric Orthopedic Data Collection Instrument, the Shriner's Hospital Upper Extremity Evaluation, Pediatric Quality of Life, and visual analog score for appearance from the patient and the parent. RESULTS: At this follow-up, only 7 of the 13 patients had a wrist position near neutral with the ability to flex and extend the wrist. Wrist range of motion was improved in four, decreased in four, and stayed the same in five patients. In contrast to these positional wrist results, statistically significant improvements were noted in several aspects of the Pediatric Orthopedic Data Collection Instrument, visual analog scores, and Shriner's Hospital Upper Extremity Evaluation scores. CONCLUSIONS: Long-term follow-up of the flexor carpi ulnaris to extensor carpi radialis brevis tendon transfer in hemiplegic patients reveals the results to be variable but favorable from a patient-reported outcome standpoint. TYPE OF STUDY/LEVEL OF EVIDENCE: Therapeutic IV.

PET Imaging of Innate Immune Activation Using 11C Radiotracers Targeting GPR84.

Chronic innate immune activation is a key hallmark of many neurological diseases and is known to result in the upregulation of GPR84 in myeloid cells (macrophages, microglia, and monocytes). As such, GPR84 can potentially serve as a sensor of proinflammatory innate immune responses. To assess the utility of GPR84 as an imaging biomarker, we synthesized 11C-MGX-10S and 11C-MGX-11Svia carbon-11 alkylation for use as positron emission tomography (PET) tracers targeting this receptor. In vitro experiments demonstrated significantly higher binding of both radiotracers to hGPR84-HEK293 cells than that of parental control HEK293 cells. Co-incubation with the GPR84 antagonist GLPG1205 reduced the binding of both radiotracers by >90%, demonstrating their high specificity for GPR84 in vitro. In vivo assessment of each radiotracer via PET imaging of healthy mice illustrated the superior brain uptake and pharmacokinetics of 11C-MGX-10S compared to 11C-MGX-11S. Subsequent use of 11C-MGX-10S to image a well-established mouse model of systemic and neuro-inflammation revealed a high PET signal in affected tissues, including the brain, liver, lung, and spleen. In vivo specificity of 11C-MGX-10S for GPR84 was confirmed by the administration of GLPG1205 followed by radiotracer injection. When compared with 11C-DPA-713-an existing radiotracer used to image innate immune activation in clinical research studies-11C-MGX-10S has multiple advantages, including its higher binding signal in inflamed tissues in the CNS and periphery and low background signal in healthy saline-treated subjects. The pronounced uptake of 11C-MGX-10S during inflammation, its high specificity for GPR84, and suitable pharmacokinetics strongly support further investigation of 11C-MGX-10S for imaging GPR84-positive myeloid cells associated with innate immune activation in animal models of inflammatory diseases and human neuropathology.

Review and critique of current testing protocols for upper-limb prostheses: a call for standardization amidst rapid technological advancements.

This article provides a comprehensive narrative review of physical task-based assessments used to evaluate the multi-grasp dexterity and functional impact of varying control systems in pediatric and adult upper-limb prostheses. Our search returned 1,442 research articles from online databases, of which 25 tests-selected for their scientific rigor, evaluation metrics, and psychometric properties-met our review criteria. We observed that despite significant advancements in the mechatronics of upper-limb prostheses, these 25 assessments are the only validated evaluation methods that have emerged since the first measure in 1948. This not only underscores the lack of a consistently updated, standardized assessment protocol for new innovations, but also reveals an unsettling trend: as technology outpaces standardized evaluation measures, developers will often support their novel devices through custom, study-specific tests. These boutique assessments can potentially introduce bias and jeopardize validity. Furthermore, our analysis revealed that current validated evaluation methods often overlook the influence of competing interests on test success. Clinical settings and research laboratories differ in their time constraints, access to specialized equipment, and testing objectives, all of which significantly influence assessment selection and consistent use. Therefore, we propose a dual testing approach to address the varied demands of these distinct environments. Additionally, we found that almost all existing task-based assessments lack an integrated mechanism for collecting patient feedback, which we assert is essential for a holistic evaluation of upper-limb prostheses. Our review underscores the pressing need for a standardized evaluation protocol capable of objectively assessing the rapidly advancing prosthetic technologies across all testing domains.

Association of Parity and Previous Birth Outcome With Brachial Plexus Birth Injury Risk.

OBJECTIVE: To evaluate the association of maternal delivery history with a brachial plexus birth injury risk in subsequent deliveries and to estimate the effect of subsequent delivery method on brachial plexus birth injury risk. METHODS: We conducted a retrospective cohort study of all live-birth deliveries occurring in California-licensed hospitals from 1996 to 2012. The primary outcome was recurrent brachial plexus birth injury in a subsequent pregnancy. The exposure was delivery history (parity, shoulder dystocia in a previous delivery, or previously delivering a neonate with brachial plexus birth injury). Multiple logistic regression was used to model adjusted associations of delivery history with brachial plexus birth injury in a subsequent pregnancy. The adjusted risk and adjusted risk difference for brachial plexus birth injury between vaginal and cesarean deliveries in subsequent pregnancies were determined, stratified by delivery history, and the number of cesarean deliveries needed to prevent one brachial plexus birth injury was determined. RESULTS: Of 6,286,324 neonates delivered by 4,104,825 individuals, 7,762 (0.12%) were diagnosed with a brachial plexus birth injury. Higher parity was associated with a 5.7% decrease in brachial plexus birth injury risk with each subsequent delivery (adjusted odds ratio [aOR] 0.94, 95% CI 0.92-0.97). Shoulder dystocia or brachial plexus birth injury in a previous delivery was associated with fivefold (0.58% vs 0.11%, aOR 5.39, 95% CI 4.10-7.08) and 17-fold (1.58% vs 0.11%, aOR 17.22, 95% CI 13.31-22.27) increases in brachial plexus birth injury risk, respectively. Among individuals with a history of delivering a neonate with a brachial plexus birth injury, cesarean delivery was associated with a 73.0% decrease in brachial plexus birth injury risk (0.60% vs 2.21%, aOR 0.27, 95% CI 0.13-0.55) compared with an 87.9% decrease in brachial plexus birth injury risk (0.02% vs 0.15%, aOR 0.12, 95% CI 0.10-0.15) in individuals without this history. Among individuals with a history of brachial plexus birth injury, 48.1 cesarean deliveries are needed to prevent one brachial plexus birth injury. CONCLUSIONS: Parity, previous shoulder dystocia, and previously delivering a neonate with brachial plexus birth injury are associated with future brachial plexus birth injury risk. These factors are identifiable prenatally and can inform discussions with pregnant individuals regarding brachial plexus birth injury risk and planned mode of delivery.

It May Not Be So Typical: Distinguishing Frontotemporal Dementia From Behavioral Variant Alzheimer's Disease.

The Banner Alzheimer's Institute Case Conference is a weekly event in which physicians and staff discuss challenging and/or teaching cases of patients seen in clinical settings. These conferences are attended by a multidisciplinary group that includes Banner Alzheimer's Institute dementia specialists, community physicians (internal medicine, family medicine, and radiology), neuropsychologists, physician assistants, nurse practitioners, social workers, medical students, residents, and fellows. The Banner Alzheimer's Institute is located in Phoenix, Arizona, and it has an ambitious mission: to end Alzheimer's disease without losing a generation, set a new standard of care for patients and families, and forge a model of collaboration in biomedical research. The Institute provides high-level care and treatment for patients affected by Alzheimer's disease, dementia, and related disorders. In addition, the Institute offers extensive support services for families and many unique and rewarding research opportunities.

Development and Initial Assessment of [18F]OP-801: a Novel Hydroxyl Dendrimer PET Tracer for Preclinical Imaging of Innate Immune Activation in the Whole Body and Brain.

PURPOSE: Innate immune activation plays a critical role in the onset and progression of many diseases. While positron emission tomography (PET) imaging provides a non-invasive means to visualize and quantify such immune responses, most available tracers are not specific for innate immune cells. To address this need, we developed [18F]OP-801 by radiolabeling a novel hydroxyl dendrimer that is selectively taken up by reactive macrophages/microglia and evaluated its ability to detect innate immune activation in mice following lipopolysaccharide (LPS) challenge. PROCEDURES: OP-801 was radiolabeled in two steps: [18F]fluorination of a tosyl precursor to yield [18F]3-fluoropropylazide, followed by a copper-catalyzed click reaction. After purification and stability testing, [18F]OP-801 (150-250 µCi) was intravenously injected into female C57BL/6 mice 24 h after intraperitoneal administration of LPS (10 mg/kg, n=14) or saline (n=6). Upon completing dynamic PET/CT imaging, mice were perfused, and radioactivity was measured in tissues of interest via gamma counting or autoradiography. RESULTS: [18F]OP-801 was produced with >95% radiochemical purity, 12-52 µCi/µg specific activity, and 4.3±1.5% decay-corrected yield. Ex vivo metabolite analysis of plasma samples (n=4) demonstrated high stability in mice (97±3% intact tracer >120 min post-injection). PET/CT images of mice following LPS challenge revealed higher signal in organs known to be inflamed in this context, including the liver, lung, and spleen. Gamma counting confirmed PET findings, showing significantly elevated signal in the same tissues compared to saline-injected mice: the liver (p=0.009), lung (p=0.030), and spleen (p=0.004). Brain PET/CT images (summed 50-60 min) revealed linearly increasing [18F]OP-801 uptake in the whole brain that significantly correlated with murine sepsis score (r=0.85, p<0.0001). Specifically, tracer uptake was significantly higher in the brain stem, cortex, olfactory bulb, white matter, and ventricles of LPS-treated mice compared to saline-treated mice (p<0.05). CONCLUSION: [18F]OP-801 is a promising new PET tracer for sensitive and specific detection of activated macrophages and microglia that warrants further investigation.

Development of [18F]DASA-10 for enhanced imaging of pyruvate kinase M2.

PURPOSE: The aim of this study was to develop a positron emission tomography (PET) radiotracer for measuring pyruvate kinase M2 (PKM2) with improved physicochemical and pharmacokinetic properties compared to [18F]DASA-23. EXPERIMENTAL DESIGN: First, we synthesized [18F]DASA-10 and tested its uptake and retention compared to [18F]DASA-23 in human and mouse glioma cell lines. We then confirmed the specificity of [18F]DASA-10 by transiently modulating the expression of PKM2 in DU145 and HeLa cells. Next, we determined [18F]DASA-10 pharmacokinetics in healthy nude mice using PET imaging and subsequently assessed the ability of [18F]DASA-10 versus [18F]DASA-23 to enable in vivo detection of intracranial gliomas in syngeneic C6 rat models of glioma. RESULTS: [18F]DASA-10 demonstrated excellent cellular uptake and retention with values significantly higher than [18F]DASA-23 in all cell lines and timepoints investigated. [18F]DASA-10 showed a 73 % and 65 % reduced uptake respectively in DU145 and HeLa cells treated with PKM2 siRNA as compared to control siRNA treated cells. [18F]DASA-10 showed favorable biodistribution and pharmacokinetic properties and a significantly improved tumor-to-brain ratio in rat C6 glioma models relative to [18F]DASA-23 (3.2 ± 0.8 versus 1.6 ± 0.3, p = 0.01). CONCLUSION: [18F]DASA-10 is a new PET radiotracer for molecular imaging of PKM2 with potential to overcome the prior limitations observed with [18F]DASA-23. [18F]DASA-10 shows promise for clinical translation to enable imaging of brain malignancies owing to its low background signal in the healthy brain.

Team Approach: The Care of Children with Hand and Upper Limb Differences.

¼ Pediatric hand and upper limb differences include a wide range of conditions that may be genetic, part of a syndrome, or arise from birth trauma or an unknown cause.¼ Because of the variety of conditions and complexity of care requiring professionals from multiple disciplines, the Pediatric Hand Team is similar in purpose to the coordinated multidisciplinary care provided by Craniofacial Panels for children with craniofacial anomalies. Pediatric hand surgeons are trained to lead and coordinate the care of children with these differences, and the Pediatric Hand Team includes occupational and/or certified hand therapists, child life specialists, geneticists and genetic counselors, prosthetists and orthotists, pediatric physical medicine and rehabilitation physicians, pediatric orthopaedic surgeons, pediatric anesthesiologists, and social workers and psychologists. The Team must also have access to pediatric imaging, including ultrasound and magnetic resonance imaging.¼ Treatment of hand differences may include observation, splinting/bracing, therapy, reconstructive surgery, or a combination of these, and indications vary with development, age, associated conditions, and child and family preference. Children who have challenges coping with the stigma of their difference may benefit from programs such as Hand Camp and the Lucky Fin Project.¼ Multiple online and print resources are available to support the Pediatric Hand Team and the child's family and other caregivers.¼ A well-coordinated team-based approach meets the physical and psychosocial needs of the child with hand and upper limb differences from birth to adulthood.

Comparison of Different Methods of Measuring Finger Range of Motion via Telehealth.

PURPOSE: This study examined the accuracy and reliability of measuring total motion of the fingers via telehealth using the following three different methods: (1) goniometry, (2) visual estimation, and (3) electronic protractor. Measurements were compared with in-person measurement, which was assumed to be the reference standard. METHODS: Thirty clinicians measured finger range of motion from prerecorded videos of a mannequin hand with articulating fingers, which was posed in extension and flexion that simulated a telehealth visit, using a goniometer with results blinded to the clinician (blinded goniometry), visual estimation, and an electronic protractor, in random order. Total motion was calculated for each finger and for all four fingers in sum. The experience level, familiarity with measuring finger range of motion, and opinions of measurement difficulty were assessed. RESULTS: Measurement with the electronic protractor was the only method equivalent to the reference standard within 20°. Remote goniometer and visual estimation did not fall within the acceptable error margin of equivalence, and both underestimated total motion. Electronic protractor also had the highest interrater reliability (intraclass correlation [upper limit, lower limit], 0.95 [0.92, 0.95]); goniometry (intraclass correlation, 0.94 [0.91, 0.97]) was nearly identical, whereas visual estimation (intraclass correlation, 0.82 [0.74, 0.89]) was much lower. Clinicians' experience and familiarity with range of motion measurements had no relationship with the findings. Clinicians reported visual estimation as the most difficult (80%) and electronic protractor as the easiest method (73%). CONCLUSIONS: This study showed that traditional in-person forms of measurement underestimate finger range of motion via telehealth; a new computer-based method (ie, electronic protractor) was found to be more accurate. CLINICAL RELEVANCE: The use of an electronic protractor can be beneficial to clinicians measuring range of motion in patients virtually.

Clinical Radiosynthesis and Translation of [18F]OP-801: A Novel Radiotracer for Imaging Reactive Microglia and Macrophages.

Positron emission tomography (PET) is a powerful tool for studying neuroinflammatory diseases; however, current PET biomarkers of neuroinflammation possess significant limitations. We recently reported a promising dendrimer PET tracer ([18F]OP-801), which is selectively taken up by reactive microglia and macrophages. Here, we describe further important characterization of [18F]OP-801 in addition to optimization and validation of a two-step clinical radiosynthesis. [18F]OP-801 was found to be stable in human plasma for 90 min post incubation, and human dose estimates were calculated for 24 organs of interest; kidneys and urinary bladder wall without bladder voiding were identified as receiving the highest absorbed dose. Following optimization detailed herein, automated radiosynthesis and quality control (QC) analyses of [18F]OP-801 were performed in triplicate in suitable radiochemical yield (6.89 ± 2.23% decay corrected), specific activity (37.49 ± 15.49 GBq/mg), and radiochemical purity for clinical imaging. Importantly, imaging mice with tracer (prepared using optimized methods) 24 h following the intraperitoneal injection of liposaccharide resulted in the robust brain PET signal. Cumulatively, these data enable clinical translation of [18F]OP-801 for imaging reactive microglia and macrophages in humans. Data from three validation runs of the clinical manufacturing and QC were submitted to the Food and Drug Administration (FDA) as part of a Drug Master File (DMF). Subsequent FDA approval to proceed was obtained, and a phase 1/2 clinical trial (NCT05395624) for first-in-human imaging in healthy controls and patients with amyotrophic lateral sclerosis is underway.

PET imaging of TREM1 identifies CNS-infiltrating myeloid cells in a mouse model of multiple sclerosis.

Multiple sclerosis (MS) is an immune-mediated demyelinating disease of the central nervous system (CNS) that causes substantial morbidity and diminished quality of life. Evidence highlights the central role of myeloid lineage cells in the initiation and progression of MS. However, existing imaging strategies for detecting myeloid cells in the CNS cannot distinguish between beneficial and harmful immune responses. Thus, imaging strategies that specifically identify myeloid cells and their activation states are critical for MS disease staging and monitoring of therapeutic responses. We hypothesized that positron emission tomography (PET) imaging of triggering receptor expressed on myeloid cells 1 (TREM1) could be used to monitor deleterious innate immune responses and disease progression in the experimental autoimmune encephalomyelitis (EAE) mouse model of MS. We first validated TREM1 as a specific marker of proinflammatory, CNS-infiltrating, peripheral myeloid cells in mice with EAE. We show that the 64Cu-radiolabeled TREM1 antibody-based PET tracer monitored active disease with 14- to 17-fold higher sensitivity than translocator protein 18 kDa (TSPO)-PET imaging, the established approach for detecting neuroinflammation in vivo. We illustrate the therapeutic potential of attenuating TREM1 signaling both genetically and pharmacologically in the EAE mice and show that TREM1-PET imaging detected responses to an FDA-approved MS therapy with siponimod (BAF312) in these animals. Last, we observed TREM1+ cells in clinical brain biopsy samples from two treatment-naïve patients with MS but not in healthy control brain tissue. Thus, TREM1-PET imaging has potential for aiding in the diagnosis of MS and monitoring of therapeutic responses to drug treatment.