Objective Clinical Measurement Tools for Functional Evaluation of the Surgical Patient

Following knee surgery, clinicians have traditionally used visually rated or time-based assessments of lower extremity movement quality to measure surgical outcomes, plan rehabilitation interventions, and measure success. These methods of assessment are prone to error and do not fully capture a patient's inefficient movement patterns post surgery. Further, currently available systems which objectively measure kinematics during these tasks are expensive and unidimensional. For these reasons, recent research has called for the development of objective and low-cost precision rehabilitation tools to improve clinical measurement of movement tasks. The purpose of this article is to highlight two such tools and their applications to knee surgery. The systems highlighted within this article are the Mizzou Point-of-Care Assessment System (MPASS) and the Mizzou Knee Arthrometer Testing System (MKATS). MPASS has demonstrated high levels of agreement with the gold-standard Vicon system in measuring kinematics during sit-to-stand (R > 0.71), lateral step-down (intraclass correlation coefficient [ICC] > 0.55, apart from ankle flexion), and drop vertical jump tasks (ICC > 0.62), as well as gait (R > 0.87). MKATS has been used to quantify differences in tibiofemoral motion between groups during lateral step-down, step-up-and-over, and step-up/step-down tasks. Objective measurement of clinical tasks using portable and inexpensive instruments, such as the MPASS and MKATS, can help clinicians identify inefficient movement patterns and asymmetries which may damage and wear down supporting structures within the knee and throughout the kinetic chain causing pain and discomfort. Identifying these issues can help clinicians to plan interventions and measure their progress at a lower cost than currently available systems. The MPASS and MKATS are useful tools which have many applications to knee surgery.

Estimating migration timing and abundance in partial migratory systems by integrating continuous antenna detections with physical captures

Many populations migrate between two different habitats (e.g. wintering/foraging to breeding area, mainstem-tributary, river-lake, river-ocean, river-side channel) as part of their life history. Detection technologies, such as passive integrated transponder (PIT) antennas or sonic receivers, can be placed at boundaries between habitats (e.g. near the confluence of rivers) to detect migratory movements of marked animals. Often, these detection systems have high detection probabilities and detect many individuals but are limited in their ability to make inferences about abundance because only marked individuals can be detected. Here, we introduce a mark-recapture modelling approach that uses detections from a double-array PIT antenna system to imply movement directionality from arrays and estimate migration timing. Additionally, when combined with physical captures, the model can be used to estimate abundances for both migratory and non-migratory groups and help quantify partial migration. We first test our approach using simulation, and results indicate our approach displayed negligible bias for total abundance (less than ±1%) and slight biases for state-specific abundance estimates (±1%-6%). We fit our model to array detections and physical captures of three native fishes (humpback chub [Gila cypha], flannelmouth sucker [Catostomus latipinnis] and bluehead sucker [Catostomus discobolus]) in the Little Colorado River (LCR) in Grand Canyon, AZ, a system that exhibits partial migration (i.e. includes residents and migrants). Abundance estimates from our model confirm that, for all three species, migratory individuals are much more numerous than residents. There was little difference in movement timing between 2021 (a year without preceding winter/spring floods) and 2022 (a year with a small flood occurring in early April). In both years, flannelmouth sucker arrived in mid-March whereas humpback chub and bluehead sucker arrivals occurred early- to mid-April. With humpback chub and flannelmouth sucker, movement timing was influenced by body size so that large individuals were more likely to arrive early compared to smaller individuals. With more years of data, this model framework could be used to evaluate ecological questions pertaining to flow cues and movement timing or intensity, relative trends in migrants versus residents and ecological drivers of skipped spawning.

Levels of complement factor H-related 4 protein do not influence susceptibility to age-related macular degeneration or its course of progression

Dysregulation of the alternative pathway (AP) of the complement system is a significant contributor to age-related macular degeneration (AMD), a primary cause of irreversible vision loss worldwide. Here, we assess the contribution of the liver-produced complement factor H-related 4 protein (FHR-4) to AMD initiation and course of progression. We show that FHR-4 variation in plasma and at the primary location of AMD-associated pathology, the retinal pigment epithelium/Bruch's membrane/choroid interface, is entirely explained by three independent quantitative trait loci (QTL). Using two distinct cohorts composed of a combined 14,965 controls and 20,741 cases, we ascertain that independent QTLs for FHR-4 are distinct from variants causally associated with AMD, and that FHR-4 variation is not independently associated with disease. Additionally, FHR-4 does not appear to influence AMD progression course among patients with disease driven predominantly by AP dysregulation. Modulation of FHR-4 is therefore unlikely to be an effective therapeutic strategy for AMD.

Targeted density electrode placement achieves high concordance with traditional high-density EEG for electrical source imaging in epilepsy

OBJECTIVE

High-density (HD) electroencephalography (EEG) is increasingly used in presurgical epilepsy evaluation, but it is demanding in time and resources. To overcome these issues, we compared EEG source imaging (ESI) solutions with a targeted density and HD-EEG montage.

METHODS

HD-EEGs from patients undergoing presurgical evaluation were analyzed. A low-density recording was created by selecting the 25 electrodes of a standard montage from the 83 electrodes of the HD-EEG and adding 8-11 electrodes around the electrode with the highest amplitude interictal epileptiform discharges. The ESI solution from this "targeted" montage was compared to that from the HD-EEG using the distance between peak vertices, sublobar concordance and a qualitative similarity measure.

RESULTS

Fifty-eight foci of forty-three patients were included. The median distance between the peak vertices of the two montages was 13.2 mm, irrespective of focus' location. Tangential generators (n = 5/58) showed a higher distance than radial generators (p = 0.04). We found sublobar concordance in 54/58 of the foci (93%). Map similarity, assessed by an epileptologist, had a median score of 4/5.

CONCLUSIONS

ESI solutions obtained from a targeted density montage show high concordance with those calculated from HD-EEG.

SIGNIFICANCE

Requiring significantly fewer electrodes, targeted density EEG allows obtaining similar ESI solutions as traditional HD-EEG montage.

Factors Associated With Actionable Gastrointestinal Panel Results in Hospitalized Children

OBJECTIVES

There is uncertainty regarding which hospitalized patients with acute gastroenteritis (AGE) benefit from gastrointestinal panel (GIP) testing. Unnecessary testing may lead to increased costs, overdiagnosis, and overtreatment. In general, AGE management and outcomes are most impacted if an actionable (bacterial or parasitic) result is obtained. We aimed to assess which clinical reasons for ordering GIP testing ("order indications") and patient factors were associated with actionable results.

METHODS

This is a cross-sectional study of pediatric patients hospitalized between 2015 and 2018 at a large pediatric health care system with diarrhea and a GIP performed. Multivariable regression analysis was used to determine associations between actionable GIP results and order indication, stool frequency, and demographics. Findings were evaluated in patients with complex chronic conditions (CCC) and non-CCC patients.

RESULTS

There were 1124 GIPs performed in 967 encounters. Non-CCC patients had more actionable results than CCC patients, and reasons for testing differed. Across both cohorts, age ≥1 year old was positively associated with actionable results. For non-CCC patients, actionable results were associated with "diarrhea with blood or pus" order indication and nonwinter season; international travel was associated with non-Clostridioides difficile bacteria and parasites. No order indications were associated with actionable results for CCC patients.

CONCLUSIONS

Patient factors and order indications that may help identify children hospitalized for AGE with actionable GIP results include older age (regardless of CCC status), as well as bloody stools and international travel in previously healthy children. Prospective validation of these findings could help improve diagnostic stewardship and decrease unnecessary testing.

Experiences in the delivery of preconception and pregnancy care for LGBTIQA+ people: A systematic review and thematic synthesis of patient and healthcare provider perspectives

BACKGROUND

The widespread availability of reproductive technology and family planning services has led to an increase in the number of available pathways to parenthood for LGBTIQA+ people. However, emerging research indicates that significant healthcare inequities have been documented among LGBTIQA+ people and attributed to the pervasiveness of structural and systemic discrimination that extends to preconception and pregnancy care.

AIM

The aim of this systematic review was to synthesise qualitative research that has explored the experiences of LGBTIQA+ people in navigating preconception and pregnancy care services to inform healthcare quality improvement.

METHOD

Six databases were searched for relevant research published between 2012 and 2023. The findings of all included studies underwent a secondary thematic synthesis, and methodological quality was assessed using the Joanna Briggs Institute Checklist for Qualitative Research.

FINDINGS

A total of 37 studies were eligible for inclusion. Four major themes were constructed through thematic synthesis: (1) unavailability of information, services, and support; (2) clinical competencies of healthcare staff; (3) hetero- and cis-sexist care experiences; and (4) discrimination and traumatisation.

CONCLUSIONS AND IMPLICATIONS FOR PRACTICE

The findings of this review indicate that LGBTIQA+ people experience significant challenges during the journey towards parenthood, marked predominantly by the pervasiveness of inequity, and defined by discriminatory healthcare processes. This review has led to several recommendations for future healthcare quality improvement through an investment in policies, procedures, and interactions that are sensitive to the needs of LGBTIQA+ people. Importantly, future research must be co-designed and led by LGBTIQA+ community input.

Abstract 5532: Increasing racial and ethnic diversity of phase 1 solid tumor clinical trials through enrollment at a safety net hospital

Background: Racial minorities are under-represented in oncology clinical trials. African Americans and Hispanic/Latinos account for 13% and 18% of the US population, respectively, but in 2018 these groups combined were only 8% of oncology trial subjects. Disproportionate enrollment can limit how generalizable trial outcomes may be and can perpetuate healthcare disparities. The majority of clinical trial enrollment occurs at large academic cancer centers that may not reflect the diverse general cancer patient population in the US. Los Angeles County/University of Southern California Medical Center (LAC+USC) is a large safety net hospital that serves a racially and ethnically diverse patient population.

Methods: We developed a database of all adult patients (pts) enrolled in phase I solid tumor trials at LAC+USC from 2015 - 2022. The data collected includes baseline demographics (age, gender, race, ethnicity, primary language, tumor histology), type of therapeutic intervention, radiologic response per RECIST 1.1, duration of treatment, and survival. Progression-free survival was defined as time from enrollment in the study until progression, discontinuation of treatment, or death. Disease control rate (DCR) was defined as pts with best response of CR, PR, or SD.

Results: 120 pts with solid tumors were enrolled in phase 1 trials at LAC+USC from 2015-2022. Median age was 58 (range 26-78); 58% female; ECOG 0-1 (99%), 2 (1%). 73 patients (61%) were Hispanic, 27 (23%) Asian/Pacific Islander, 9 (8%) non-Hispanic (NH) White, 5 (4%) were NH Black, and 6 (5%) were unknown. 70% of pts had a primary language other than English: 56% Spanish. The most common tumor types were colorectal (16%), hepatocellular (13%), non-small cell lung (12%), head and neck (11%), and ovarian (11%). Trial interventions included chemotherapy (19%), immunotherapy (35%), targeted therapy (54%), and 10% required biomarker selection. The disease control rate (DCR) was 58/120 (48%): 2 pts had CR, 9 pts had PR, and 47 pts had SD. 4-month progression-free survival (PFS) was 42/120 (35%), and 6-month PFS was 27/120 (23%). 90-day survival was confirmed in 101/120 (84%) of patients.

Discussion: A racially diverse population can be successfully enrolled in early phase oncology trials at a safety net hospital. Patient populations that are underrepresented nationally in clinical trials had robust enrollment and comprised the majority of participation (88%) in this setting. Almost half of patients derived clinical benefit (48% DCR) from trial participation. Creating an infrastructure to enroll patients to phase 1 clinical trials at a safety net hospital may be a successful strategy to improve racial and ethnic diversity.

Citation Format: Varun Roy, Esther Lee, Ming Li, Xiomara Menendez, Elena Nieves, Rebecca Umayam, Nicole Jensen, Lorraine Martinez, Diana Hanna, Jorge Nieva, Anthony El-Khoueiry, Jacob Thomas. Increasing racial and ethnic diversity of phase 1 solid tumor clinical trials through enrollment at a safety net hospital. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 5532.

First report of Meliola panici on Ottochloa nodosa (Kunth) Dandy (Poaceae)

This is the first report of biotrophic association of Black Mildew disease causing fungus on Ottochloa nodosa (Poaceae). The fungal pathogen is identified as Meliola panici. The samples of the fungus collected from southern Western Ghats of Kerala State, India is described.

The effect of clear aligners on speech: a systematic review

OBJECTIVE

To assess the effect of clear aligners on the speech of patients undergoing orthodontic therapy through a systematic review of the literature. Search methods and selection criteria: The protocol of this systematic review was registered in the International Prospective Register of Systematic Reviews (PROSPERO) CRD42021278694. An electronic search of the Scopus, Embase, Pubmed, and Web of Science databases was done for papers published between January 2000 till September 2021. Studies that evaluated speech difficulties in patients undergoing orthodontic treatment with clear aligners using objective and subjective analyses were included. The evaluated primary outcome was speech difficulties. Secondary outcomes were time to adaptation and recovery from speech difficulties. Study quality was assessed based on the Cochrane Handbook for Systematic Reviews of Interventions Handbook guidelines and ROBINS-I tool.

RESULTS

Two hundred and eighty-three articles were screened to identify seven studies (n = 332 patients) that assessed speech difficulty with aligners, of which two were randomized trials. Meta-analysis was not performed due to the heterogeneity in the study designs. Five studies compared speech difficulty with aligners to fixed appliances. Two studies showed a moderate risk of bias and five studies had a serious risk of bias. Level of evidence was downgraded to low due to the methodological insufficiencies and risk of bias in the studies. All seven studies reported that aligners could influence the clarity and delivery of speech, similar to fixed appliances. Various phonemes were affected including /s/,/z/,/zh/,/sh/,/th/,/ch/ on wearing aligners. Errors in articulation of consonants and sibilants were noted with lisping and speech impairment. These speech difficulties were temporary and most patients recovered in 7-14 days while few patients took 30-60 days to recover.

CONCLUSION

The likelihood of speech difficulties appears high with clear aligners. However, patients adapt quickly and speech returns to normal. The results of this review must be interpreted with caution and more well-designed randomized trials examining long-term effects of aligners on speech are indicated.

CLINICAL SIGNIFICANCE

Orthodontists should counsel patients opting for clear aligner treatment of the potential transient speech difficulties.

REGISTRATION

The protocol for this systematic review was registered in the International Prospective Register of Systematic Reviews (PROSPERO) CRD42021278694.

Measurement of the ν_{e}-Nucleus Charged-Current Double-Differential Cross Section at ⟨E_{ν}⟩=2.4 GeV Using NOvA

The inclusive electron neutrino charged-current cross section is measured in the NOvA near detector using 8.02×10^{20} protons-on-target in the NuMI beam. The sample of GeV electron neutrino interactions is the largest analyzed to date and is limited by ≃17% systematic rather than the ≃7.4% statistical uncertainties. The double-differential cross section in final-state electron energy and angle is presented for the first time, together with the single-differential dependence on Q^{2} (squared four-momentum transfer) and energy, in the range 1  GeV≤E_{ν}<6  GeV. Detailed comparisons are made to the predictions of the GENIE, GiBUU, NEUT, and NuWro neutrino event generators. The data do not strongly favor a model over the others consistently across all three cross sections measured, though some models have especially good or poor agreement in the single differential cross section vs Q^{2}.

Serial Subtraction Alters Lateral Step-down Tibiofemoral Kinematics in Healthy Adults

This study evaluated the effects of two types of cognitive dual-tasking on three-dimensional knee kinematics during the lateral step-down. 19 healthy individuals (22.05±1.61 yrs., 173.92±9.21 cm, 67.99±12.65 kg) participated in this study. Participants completed 5 repetitions of a lateral step-down task for each leg and each testing condition (control, Stroop, and serial subtraction by seven). An electromagnetic motion sensor was attached to the femur via compression clamp placed about the medial and lateral epicondyles. Another sensor was attached 2 cm below the ipsilateral tibial tuberosity. A custom MATLAB algorithm located the knee joint axis of rotation from dynamic knee flexion and extension. Discrete kinematics at peak flexion were used in this study. Paired samples t-tests were used to compare average frontal, transverse, and sagittal plane knee position at maximum flexion between conditions for each leg. No significant differences were found for either limb between control and Stroop conditions. Comparisons revealed significant differences in frontal and transverse plane knee angles at peak flexion between the control and serial subtraction by seven conditions. These findings indicate serial subtraction by seven requires different cognitive processing abilities which may cause greater interference with some aspects of motor control.

192. Predictors of Actionable Results on Gastrointestinal Panel Testing for Children Hospitalized with Acute Diarrheal Illnesses

Background

Among hospitalized children with acute diarrheal illnesses, multiplex PCR gastrointestinal panels (GIP) are commonly overused. GIPs are most likely to impact management and outcomes if an actionable (bacterial or parasitic) result is obtained. To inform future diagnostic stewardship, we evaluated which clinical factors, including provider-reported test indications and stool frequency, were associated with actionable results.

Methods

This is a multicenter cross-sectional study of children ≤ 18 years old hospitalized at any Children’s Hospital Colorado site between 2015-2018 with a diarrheal illness and at least one GIP performed. We used multivariable logistic regression to determine associations between actionable GIP results and testing indication, stool frequency, and demographics. We evaluated these findings in two subgroups - patients with at least one complex chronic condition (CCC) and non-CCC patients.

Results

There were 1,124 GIPs performed for 967 encounters. Yield of actionable results was higher for non-CCC than CCC patients (30% vs. 21%, p &lt; .001) (Image 1), and test indications differed between the two groups (Table 1). For non-CCC patients, we found positive associations between actionable results and “Diarrhea with blood or pus” test indication (relative risk (RR) 1.5, confidence limits (CL) 1.09-2.07, p = .01), summer season (RR 1.69, CL 1.14-2.5, p =.01), and age ≥1 yr (RR 2.88, CL 1.82-4.54, p&lt; .001). Male gender was negatively associated (RR 0.75, CL 0.58-0.96, p=.02). For CCC patients, age ≥1 yr was positively associated with actionable results (RR 3.17, CL 1.59-6.32, p = .001). ≥4 stools per day (RR 0.73, CL 0.54-.99, p=0.04) and ICU admission (RR 0.69, CL 0.5-0.95, p=0.2) were negatively associated with actionable results (Table 2).

Conclusion

For both cohorts, age ≥1 was positively associated with actionable GIP results. For otherwise healthy children, bloody diarrhea and summertime were positively associated with actionable results. CCC patients had less frequent actionable results, and no GIP indications were predictive of actionable results. A higher stool burden did not statistically increase the probability of an actionable result in either cohort. These results may guide diagnostic stewardships efforts for GIP ordering in pediatric patients.

Disclosures

Samuel R. Dominguez, MD PhD, Biofire DIagnostics: Advisor/Consultant|Biofire DIagnostics: Grant/Research Support|DiaSorin Molecular: Advisor/Consultant|Karius: Advisor/Consultant|Pfizer: Grant/Research Support.

993. “I feel like they’re actually listening to me”: A Pilot Study of Hospital Discharge-Decision Making for Patients with Injection Drug Use-Associated Infections

Background

Conversation guides have the potential to transform care for patients hospitalized with injection drug use (IDU)-associated infections. This study’s objectives were to 1) pilot a structured conversation guide for hospital discharge decision making in patients with IDU-associated infections 2) investigate the guide’s feasibility and acceptability and 3) examine patient and provider experiences, patient outcomes, and lessons learned.

Methods

We developed a conversation guide and conducted semi-structured interviews with physicians and patients at a tertiary care center in Maine. We interviewed physicians after each piloted the guide with two patients. We interviewed patients less than one week after the conversation and again after 4-6 weeks. Two analysts indexed transcriptions and used the framework method to identify and organize relevant information. We conducted retrospective chart review to corroborate and contextualize qualitative data.

Results

Eight patients and four infectious disease physicians piloted the conversation guide. All patients (N=8) completed antimicrobial treatment and 88% were discharged on medication for opioid use disorder (Table 1). All providers and most patients stated that the conversation guide was important for incorporating patient preferences and antimicrobial treatment options. Patients appreciated more autonomy and their voices being included in their care. Providers felt the guide facilitated their understanding of patient values. Values and preferences between patients and providers were aligned. Participants identified the length of the guide, discussion of pain management, and addressing post-discharge needs such as housing as areas for improvement (Table 2).

Conclusion

The use of a conversation guide to inform hospital discharge decision making for patients with IDU-associated infections incorporates patient preferences and values into treatment decisions. While we identified areas for improvement, overall patients and providers believed that this novel conversation guide helped to improve patient care and autonomy.

Disclosures

Kinna Thakarar, DO, MPH, Maine Medical Center: Board Member|NIH: Grant/Research Support|University of New England: Board Member Monica K. Sikka, MD, F2G: Site research investigator Ellen Eaton, MD, MSPH, Gilead: Grant/Research Support.

Spatial transcriptomics landscape of lesions from non-communicable inflammatory skin diseases

Abundant heterogeneous immune cells infiltrate lesions in chronic inflammatory diseases and characterization of these cells is needed to distinguish disease-promoting from bystander immune cells. Here, we investigate the landscape of non-communicable inflammatory skin diseases (ncISD) by spatial transcriptomics resulting in a large repository of 62,000 spatially defined human cutaneous transcriptomes from 31 patients. Despite the expected immune cell infiltration, we observe rather low numbers of pathogenic disease promoting cytokine transcripts (IFNG, IL13 and IL17A), i.e. >125 times less compared to the mean expression of all other genes over lesional skin sections. Nevertheless, cytokine expression is limited to lesional skin and presented in a disease-specific pattern. Leveraging a density-based spatial clustering method, we identify specific responder gene signatures in direct proximity of cytokines, and confirm that detected cytokine transcripts initiate amplification cascades of up to thousands of specific responder transcripts forming localized epidermal clusters. Thus, within the abundant and heterogeneous infiltrates of ncISD, only a low number of cytokine transcripts and their translated proteins promote disease by initiating an inflammatory amplification cascade in their local microenvironment.