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Journal of Clinical Medicine

MDPI AG

Preprints posted in the last 90 days, ranked by how well they match Journal of Clinical Medicine's content profile, based on 91 papers previously published here. The average preprint has a 0.21% match score for this journal, so anything above that is already an above-average fit.

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Beyond Citations: Identifying Transformational Research in Hypospadias Through Bibliometrics and the Disruption Index

Abbas, T.; Naznine, M.; Mykha, M.; Mancha, M.; Hardas, A.; Raharja, P. A. R.; Chowdhury, M. E. H.

2026-04-20 urology 10.64898/2026.04.18.26351160 medRxiv
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Hypospadias, a common congenital anomaly requiring surgical correction, has seen growing research in surgical techniques and outcomes. However, no comprehensive bibliometric or disruption-based analysis exists to map the fields evolution. This study uses bibliometrics and the Disruption Index (DI) to identify key transformational research in hypospadias. A systematic search of five databases (PubMed, Web of Science, ScienceDirect, Scopus, and Dimensions) from January 1990 to December 2023 was conducted, yielding 7,732 articles. After applying inclusion criteria, 200 studies were analyzed. Citation data and DI scores were calculated using OpenCitations. Spearmans rank test assessed correlations between DI and citation metrics. A subgroup analysis identified trends based on the latest hypospadias research priorities. The mean citation count was 72.3 (SD = 43.1) with a mean DI of 0.011 (SD = 0.17). Five studies, focusing on complications, analgesia, and surgical techniques, had the highest DI (1.0). A moderate positive correlation was found between DI and citation rate ({rho} = 0.405, p < 0.001). Subgroup analysis showed most research focused on surgical techniques (30.5%) and etiology (25.8%), while areas like surgical training (2.6%) and innovation (0%) were underrepresented. This study identifies critical gaps in hypospadias research. The DI reveals influential studies that redirect research trajectories. Future work should focus on innovation and translational research to accelerate advancements in hypospadias care.

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OGSCalc: Mathematical formulae and web-based application to incorporate rotational discrepancies into translational discrepancies for assessment of accuracy in orthognathic surgery

Hue, J.; Yeo, J.; Saigo, L.

2026-04-04 dentistry and oral medicine 10.64898/2026.04.03.26350094 medRxiv
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Objectives: Accurate assessment of orthognathic surgical accuracy is essential in the evaluation of operative techniques. Surgical accuracy is often reported as rotational and translational deviations from planned positions. This results in 6 separate values, translation in three planes, anterior-posterior (AP), superior-inferior (SI) and medial-lateral (ML) and rotations about three axes, pitch, roll and yaw. However, rotations will influence 3-dimensional positions and translational discrepancies. Methods: We have derived a mathematical formula using Euclidean geometry and quadratic functions that quantifies the impact of rotations on translational discrepancies. This allows for the calculation of a total discrepancy value that incorporates the three translations and rotations. Furthermore, we developed an interactive web-based application using the open-source shiny R package. Results: We have successfully reduced equations from Euclidean geometry into a quadratic form. The equation is as follows, [4(sin{theta}/2)2-2]x2 + [8d(sin{theta}/2)2-2d]x + 4d2(sin{theta}/2)2 = 0, where {theta} represents the rotational discrepancy in radians and d represents the translation discrepancy. This allows us to solve for the correction needed to be made to translational discrepancies to account for the influence of rotational discrepancies. We successfully developed a web application with a user-friendly graphical user interface. Clinicians upload their own data in the excel (.xlsx) file format and the application automatically performs the necessary calculations over many patients, returning a downloadable table of results. Conclusion: We present a mathematical formula incorporated into a web-application to combine translational and rotational discrepancies for deeper insight when evaluating orthognathic surgical accuracy. Clinical Relevance: This allows surgeons to account for rotational influence on 3-dimensional translational discrepancies.

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Junctional Hounsfield unit ratio: understanding patient-specific vertebral bone strength for proximal junctional kyphosis risk assessment in adult spinal deformity surgery

Nagatani, Y.; Segi, N.; Ito, S.; Ouchida, J.; Yamauchi, I.; Ode, Y.; Okada, Y.; Takeichi, Y.; Tachi, H.; Kagami, Y.; Morishita, K.; Oishi, R.; Miyairi, Y.; Morita, Y.; Ohshima, K.; Oyama, H.; Ogura, K.; Shinjo, R.; Ohara, T.; Tsuji, T.; Kanemura, T.; Imagama, S.; Nakashima, H.

2026-04-06 orthopedics 10.64898/2026.04.05.26349586 medRxiv
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Study design A retrospective case control study Objective To predict proximal junctional kyphosis (PJK) risk by normalizing individual vertebral bone strength using the ratio of vertebral Hounsfield unit (HU) values around the upper instrumented vertebrae (UIV). Summary of background data PJK poses a significant challenge in treating patients after adult spinal deformity (ASD) surgery. While the vertebral body HU value is associated with PJK risk, the optimal threshold remains unclear, and a relative assessment of HU values within individuals has not been conducted. Methods Data on patients who underwent corrective fusion of the middle to lower thoracic region of the pelvis for ASD were assessed. The 126 patients were categorized into PJK and non-PJK groups. We compared the patients' backgrounds, vertebral body HU, and junctional HU ratio, defined as the HU value of UIV+1 divided by the HU value of UIV (HUUIV+1/HUUIV). The UIV+2/UIV+1 HU ratio was calculated similarly. Results The PJK and non-PJK groups included 30 and 96 patients, respectively. After propensity score matching, 28 patients from each group were analyzed. HU values at UIV+2 and UIV+1 (117.0 {+/-} 46.6 vs 145.1 {+/-} 45.9, p=0.018, and 105.5 {+/-} 36.2 vs 147.3 {+/-} 44.9, p<0.001, respectively) were lower in the PJK group. Junctional HU ratio was significantly lower in the PJK group (0.88 {+/-} 0.18 vs 1.13 {+/-} 0.25, p<0.001), and receiver operating characteristic analysis showed that the junctional HU ratio had the highest discriminative ability (area under the curve 0.812). At the optimal cutoff value (HU ratio of 0.905), the sensitivity and specificity for PJK were 64.3% and 89.3%, respectively. Conclusions A low junctional HU ratio was strongly associated with PJK after ASD surgery. This parameter reflects the bone strength mismatch at the proximal junction and may help improve preoperative risk assessment and UIV selection.

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Inequalities in physical fitness in children with hearing loss: a systematic review and meta-analysis with implications for inclusive physical education and school curriculum

Diaz-Franco, M. V.; Caniuqueo-Vargas, A.; Lasekan, O. A.; Castillo-Sarmiento, C. A.; Rodriguez-Martin, B.

2026-06-09 otolaryngology 10.64898/2026.06.08.26355131 medRxiv
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Background: Childhood and adolescent hearing loss affects not only communication and cognitive development but also motor skills and school participation. Consequently, it generates inequalities in learning and educational inclusion. Nevertheless, no systematic review has yet analyzed these differences from an inclusive education perspective. Methods: A systematic review with meta-analysis was conducted following PRISMA guidelines and registered in PROSPERO. Observational studies comparing physical fitness between children and adolescents with hearing loss and their hearing peers were included. Methodological quality was assessed using the Newcastle--Ottawa Scale, and standardized effect sizes were calculated with a random-effects model. Results: Five studies (n=404) were analyzed. Findings revealed significant differences in strength, agility, speed, and balance. Moreover, the meta-analysis showed a large standardized effect favoring hearing children (ES=-2.35; 95% CI: -3.34 to -1.37). Conclusions: Children and adolescents with hearing loss present significantly lower physical fitness, which may affect the planning of physical education activities if their capacities are misinterpreted. Implementing inclusive and adapted strategies within the school curriculum is essential to ensure equal opportunities, improve physical fitness, and promote educational equity.

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Success And Predictors Of Orthodontic Traction For Impacted Maxillary Incisors: A Systematic Review And Meta-Analysis

Mahfouz, M.; Alzaben, E.

2026-04-01 dentistry and oral medicine 10.64898/2026.03.31.26349803 medRxiv
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Background: Impacted maxillary incisors present significant clinical challenges requiring interdisciplinary management. To date, no meta-analysis has quantitatively synthesized success rates specifically for impacted maxillary incisors. This systematic review and meta-analysis aimed to determine the pooled success rate of orthodontic traction for impacted maxillary incisors and identify factors influencing outcomes. Methods: A systematic review and meta-analysis of observational studies was conducted following PRISMA 2020 guidelines. A systematic search was performed in PubMed, Epistemonikos, Cochrane Library, and Google Scholar (January 2011 - March 5, 2026). Primary studies reporting success rates of orthodontic traction for impacted maxillary incisors were included. The primary outcome was successful eruption and alignment into the dental arch. Although the protocol was not registered in PROSPERO, the methodology was predefined, documented, and strictly followed to minimize risk of bias. Pooled success rates were calculated using a random-effects model (DerSimonian-Laird method) with R software (meta package). Heterogeneity was assessed using I2 statistics. Publication bias was evaluated using funnel plots and Egger's test. Quality assessment employed ROBINS-I. Results: Eleven studies with 2,847 patients were included in the systematic review; 2,149 patients from 11 studies provided sufficient data for quantitative synthesis. The pooled success rate was 82.3% (95% CI: 78.6-86.0%), with a prediction interval ranging from 70% to 91%. Considerable heterogeneity was observed (I2 = 78%, p < 0.001). Subgroup analysis showed that younger age (<14 years) was associated with significantly higher success rates (88.4% vs. 78.2%, p = 0.01). Mild impaction depth (<5mm) was associated with higher success rates (89.2% vs. 76.5%, p = 0.02). No significant publication bias was detected (Egger's test, p = 0.18); however, the power to detect publication bias is limited with fewer than 15 studies. Certainty of evidence was moderate due to heterogeneity and observational study designs. Conclusions: Orthodontic traction is an effective, though not universally successful, treatment modality, with a pooled success rate of 82.3% for impacted maxillary incisors, and success significantly associated with patient age and impaction severity. Early intervention and favorable impaction characteristics are associated with better outcomes

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The UroLume Endoprosthesis and UroLume Cripple Syndrome: A Systematic Review and Meta-Analysis of Pathophysiology, Complications, Surgical Management, Psychological Burden, and Epidemiology of Surviving Patients Worldwide

Kapos, I. P.

2026-03-30 urology 10.64898/2026.03.28.26349606 medRxiv
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ABSTRACT Background: The UroLume endoprosthesis (AMS/Endo-care), commercially available 1988-2007 and FDA-approved in 1996, was positioned as a permanent minimally invasive solution for recurrent bulbar urethral stricture and benign prostatic hyperplasia (BPH). Despite early procedural success, long-term data revealed a catastrophic complication profile - including irreversible urethral destruction, spongiofibrosis, MDR infections, chronic kidney disease, and severe psychological morbidity - culminating in the clinical entity termed UroLume Cripple Syndrome. No systematic epidemiological analysis of surviving patients in 2026 currently exists. Objectives: To synthesise four decades of evidence on UroLume pathophysiology, complications, surgical management hierarchy, psychological burden, and cumulative multimorbidity; to perform a pooled meta-analysis of primary complication endpoints; and to present an original epidemiological model estimating surviving patients globally and in Greece in 2026. Methods: PRISMA 2020-compliant systematic review and meta-analysis of PubMed, Embase, and Cochrane Library (all dates to March 2026). Inclusion: peer-reviewed studies of UroLume implantation, explantation, or post-UroLume reconstruction; minimum 12-month follow-up; series n >= 10. Random-effects meta-analysis (DerSimonian-Laird estimator) was performed for three primary complication endpoints across all 43 included studies. An original bottom-up sequential filter epidemiological model was constructed integrating WHO 2021 actuarial tables, published explantation rates, multimorbidity excess mortality, age distributions, complete epithelialisation prevalence, and reconstruction failure rates. Results: Forty-three studies met inclusion criteria (n=3,847 patients). Pooled meta-analysis yielded: restenosis/tissue ingrowth 37.9% (95% CI 36.1%-39.8%, I2=0%); stent explantation 8.7% (95% CI 7.7%-9.8%, I2=0%); urinary incontinence 9.7% (95% CI 8.7%-10.9%, I2=0%). Complete epithelialisation, irreversible after 12 months, affects approximately 8-13% of long-term survivors and defines the UroLume Cripple endpoint. Post-UroLume buccal mucosa graft urethroplasty achieves 76.7% success at 5 years when explantation is feasible. Our epidemiological model estimates 2,500-5,000 surviving patients globally with UroLume in situ in 2026, reducing to fewer than 100 clinically active patients aged <60 years following full multimorbidity adjustment. A six-filter sequential model for Greece converges to a final estimate of 1 surviving patient aged <60 years with complete epithelialisation following failed reconstruction. Conclusions: UroLume Cripple Syndrome is a chronic iatrogenic disease with distinct pathophysiological, reconstructive, psychological, and social dimensions that has received insufficient recognition as a defined clinical entity. The surviving patient population is small but institutionally invisible: no registry exists, no dedicated follow-up protocol has been established, and specialist reconstructive capacity is confined to approximately eight centres worldwide. Registry creation, EAU guideline extension, and specialist referral pathways are the minimum adequate institutional responses. This preprint has been deposited on medRxiv simultaneously with journal submission.

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Traumatic Occlusion in Orthodontics: A Systematic Review and Meta-Analysis of Prevalence, Classification, Treatment Outcomes, and the Evidence-Practice Gap

Mahfouz, M.; Alzaben, E.

2026-05-04 dentistry and oral medicine 10.64898/2026.05.02.26352281 medRxiv
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BackgroundTrauma from occlusion (TFO) is a frequently under-recognized clinical entity. While narrative reviews exist, no prior systematic review has quantitatively synthesized the prevalence of TFO signs in orthodontic patients, the distribution of the Akerly classification for deep traumatic overbite, the efficacy of orthodontic intrusion, or the outcomes of immediate orthodontic repositioning of traumatized incisors. Furthermore, the knowledge-practice gap among orthodontists regarding trauma management has not been meta-analyzed. MethodsSystematic review and meta-analysis of observational and interventional studies, including cross-sectional studies, randomized controlled trials, and before-after studies. We searched PubMed (n=57), PubMed Central (n=538), the Cochrane Library (n=11: 2 reviews, 9 trials), and Google Scholar (~3,930) up to December 2025. Studies reporting prevalence of TFO signs, Akerly classification distribution, overbite reduction following orthodontic intrusion, success of immediate orthodontic repositioning, or orthodontist knowledge/practice were included. Random-effects meta-analyses were performed using the meta package in R (DerSimonian-Laird estimation for {tau}2). The protocol was not registered due to the exploratory nature of this multi-domain synthesis; however, the methodology strictly adhered to PRISMA 2020 guidelines. ResultsTwenty-seven studies (n=8,432 participants) were included. The pooled prevalence of any TFO sign was 34% (95%CI:27-42%, I2=86%), with wide prediction intervals indicating substantial between-study variability. TFO was variably defined across studies as the presence of [&ge;]1 of the following: fremitus, increased mobility, occlusal interference, soft tissue trauma, or CR-CO discrepancy. Higher prevalence was observed in Class II malocclusion (46% vs. 22%). Among deep traumatic overbite cases classified using the Akerly system, Type II was most common (52%, 95%CI:44-60%), followed by Type I (31%) and Type III (17%). Orthodontic intrusion reduced overbite by a mean of 2.8 mm (95%CI:2.1-3.5, I2=72%); TAD-assisted intrusion produced greater reduction (3.4 mm) than conventional archwires (2.1 mm, p<0.001). Immediate orthodontic repositioning of traumatized incisors with light forces ([&le;]50 g) achieved 91% success (95%CI:84-96%) at 12 months, comparable to splinting (84%), with no statistically significant difference between groups. The orthodontic group required fewer visits and reported better comfort. Meta-analysis of orthodontist knowledge showed correct awareness of specific trauma management protocols was below 40% in most domains, indicating a substantial evidence-practice gap. ConclusionThis first systematic review and meta-analysis on TFO in orthodontics provides preliminary quantitative benchmarks. One-third of orthodontic patients exhibit TFO signs; Akerly Type II is the dominant deep overbite pattern; orthodontic intrusion effectively reduces overbite by approximately 3 mm; immediate light-force repositioning is comparable to splinting in success and superior in efficiency. However, the disconnect between high clinical efficacy (e.g., 91% success of repositioning) and low practitioner awareness (<40%) represents a substantial translational gap in clinical practice. Assessment of publication bias was limited due to the small number of studies in several analyses (<10), precluding reliable funnel plot interpretation.

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Cation Enrichment and Hypersialylation in Chronic Rhinosinusitis Mucus

Wood, A. M.; Detwiler, R. E.; Coughlin, M.; Pollard, C. E.; Alt, J. A.; Pulsipher, A.; Kramer Stratton, J.

2026-05-27 otolaryngology 10.64898/2026.05.23.26353957 medRxiv
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Background: Chronic rhinosinusitis (CRS) is a heterogeneous inflammatory airway disease associated with impaired mucociliary clearance and persistent inflammation. While prior work has focused on inflammatory and molecular pathways, the physicochemical properties of mucus itself remain poorly characterized. This study aimed to define compositional and biophysical features of CRS mucus that may contribute to dysfunction. Methods: A prospective cross-sectional study was conducted in 15 adults undergoing endoscopic sinus surgery (11 CRS, 4 controls). Mucus was collected from the middle meatus. Hydration was measured by lyophilization. Ionic composition was quantified using mass spectrometry. Viscoelasticity was assessed via oscillatory shear rheology. Total protein, total carbohydrate, sialic acid (Sia) and fucose (Fuc) content were quantified using enzymatic and chemical assays. Statistical comparisons were performed using nonparametric tests. Results: CRS mucus exhibited significantly higher Ca2+; and Mg2+; concentrations (approximately two-fold; p<0.05) and increased variability in hydration and ion content compared to controls. Rheology showed greater heterogeneity and a non-significant trend toward increased viscoelasticity in CRS. Total protein and carbohydrate content were not significantly different; however, the carbohydrate-to-protein ratio was significantly reduced in CRS (p=0.04). Sia content and Sia-to-carbohydrate ratio were significantly elevated in CRS (p=0.04 and p=0.002), particularly in CRS with nasal polyps. Fuc content did not differ between groups. Conclusions: CRS mucus demonstrates coordinated alterations in ionic composition and glycosylation, characterized by increased cation content, hypersialylation, and reduced carbohydrate-to-protein ratios. These changes may contribute to altered mucus properties and impaired mucociliary clearance, highlighting mucus composition as a potential therapeutic target in CRS.

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Incisor Extraction in Orthodontics: A Systematic Review and Meta-Analysis of Clinical Outcomes and Biomechanics

Mahfouz, M.; Alzaben, E.

2026-03-25 dentistry and oral medicine 10.64898/2026.03.23.26349102 medRxiv
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Background: Incisor extraction represents a strategic yet underutilized orthodontic treatment modality for managing anterior discrepancies. Despite its clinical relevance, the evidence base has not been systematically synthesized with meta-analytic techniques. Objective: To systematically review and meta-analyze the evidence on incisor extraction in orthodontic treatment, evaluating clinical outcomes and biomechanical efficacy in both maxillary and mandibular arches. Methods: A comprehensive search of open-access electronic databases (PubMed, LILACS, SciELO, Google Scholar, DOAJ, OpenGrey) and orthodontic journal archives was conducted from inception to January 11, 2026 following PRISMA guidelines. Eligible studies included randomized controlled trials, prospective cohort studies, and retrospective cohort studies with greater than or equal to 10 patients reporting quantitative outcomes following incisor extraction or incisor movement with premolar extraction. Primary outcomes included space closure efficiency, incisor position changes, root resorption, and stability. Risk of bias was assessed using ROBINS-I for observational studies and Cochrane RoB 2.0 for RCTs. Certainty of evidence was evaluated using GRADE. Results: From 1,842 identified records, 20 primary studies met inclusion criteria (4 RCTs, 16 observational studies), comprising 1,347 patients. Sixteen studies provided data for meta-analysis. With moderate-certainty evidence, mandibular incisor extraction (8 studies, n=412) demonstrated mean space closure of 5.2 mm (95% CI 4.8 to 5.6 mm, I-squared=34%) with favorable long-term stability (mean irregularity increase 0.3 mm, 95% CI 0.1 to 0.5 mm, I-squared=28%). Low-certainty evidence indicates clear aligner accuracy is limited to 78.9% of predicted incisor tip movement (3 studies, n=187, 95% CI 72.3 to 85.5%, I-squared=41%); these findings may not reflect newer generation aligner systems. Low-certainty evidence suggests maxillary incisor movement following premolar extraction (6 studies using tomographic imaging, n=387) results in palatal bone resorption (mean -0.43 mm, 95% CI -0.62 to -0.24 mm, I-squared=52%), with greater effects in adults versus adolescents (mean difference 0.31 mm, p = 0.02); although statistically significant, the magnitude may be clinically negligible in patients with adequate baseline alveolar thickness. Moderate-certainty evidence indicates en-masse retraction results in faster space closure than two-step retraction (4 RCTs, n=214, mean -4.2 months, 95% CI -5.8 to -2.6 months). Moderate-certainty evidence shows root resorption incidence is 12.4% (95% CI 8.7 to 16.1%), with subgroup analysis: greater than 2 mm threshold 13.2% (7 studies), at least one-quarter root length threshold 11.4% (5 studies). Low-certainty evidence suggests extraction versus non-extraction comparisons (4 studies, n=326) show no significant differences in relapse. Conclusions: Mandibular incisor extraction demonstrates favorable long-term stability with minimal profile changes but requires recognition of clear aligner accuracy limitations. Maxillary incisor movement carries risks including palatal bone resorption, particularly in adults, though the clinical significance may vary with baseline alveolar thickness. En-masse retraction results in faster space closure with comparable root resorption risk. Treatment decisions should consider patient-specific factors including age, alveolar bone morphology, malocclusion pattern, and appliance selection.

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Low-Cost Precision Nutrition Recommendations, Generated by Metataxonomy-based Microbiome Tests, Improve Food Group Choices and Gut Health Indicators in a Population with Obesity Diagnosis in Colombia

Caro-Miranda, V.; Blel-Jubiz, S.; Adarve-Rengifo, I.; Londono-Osorio, S.; Arrieta-Echeverri, M. C.; Gomez-Mesa, L.; Serna-Tangariffe, J. D.; Munoz, A.; Zapata, C. A.; Sierra-Zapata, L.

2026-05-04 genetic and genomic medicine 10.64898/2026.04.28.25331845 medRxiv
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AimsThis study aimed to explore the relationship between gut microbiota composition, obesity, and the effects of a dietary intervention in 50 participants with obesity diagnosis from Antioquia, Colombia. MethodsA single-blind intervention study was conducted, with 25 participants assigned to a control group (CG) and 25 to an intervention group (IG), these last followed a microbiota-enhancing dietary plan for 90 consecutive days. Gut microbiota changes were assessed by sequencing region V3-V4 of 16S rRNA gene and applying the analytical methodology of Biomatest(R) gut health index. Blood biomarkers, including HbA1C, cholesterol, HDL, LDL, triglycerides, and glucose, were measured at baseline and post-intervention. ResultsPrevotella and Succinivibrio were prevalent in the study population. The IG showed significant increases in gut microbial diversity (Shannon index) from baseline to post-intervention. Both groups exhibited significant changes in the Biomatest gut health index, with significant improvements in the IG. Significant correlations were found between dietary intake, blood biomarkers, and microbial abundances, such as the direct association between serum glucose and ultra-processed food intake and between total cholesterol and Dialister. Fish and seafood consumption correlated positively with Akkermansia, while egg intake was associated with higher levels of Desulfovibrio, and Lactobacillus with decreased glycated hemoglobin. The IG experienced a significant rise in Roseburia, a gut health biomarker, while the CG showed higher levels in inflammatory groups like Fusobacteriota. ConclusionsDietary intake significantly influences gut microbiota composition and blood biomarkers. Nutritional programs that improve gut microbiota, as demonstrated by the IG, positively impact gut health in people with obesity diagnosis and may influence healthier dietary choices. These findings support integrating microbiota diagnostics into personalized nutrition strategies, contributing valuable data on Latin American populations. O_FIG O_LINKSMALLFIG WIDTH=195 HEIGHT=200 SRC="FIGDIR/small/25331845v1_ufig1.gif" ALT="Figure 1"> View larger version (48K): org.highwire.dtl.DTLVardef@1652035org.highwire.dtl.DTLVardef@25a04borg.highwire.dtl.DTLVardef@3ed98corg.highwire.dtl.DTLVardef@3caedf_HPS_FORMAT_FIGEXP M_FIG C_FIG

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Surgical complications during pregnancy following bariatric surgery: a Belgian nationwide population-based study

De Mulder, P.; Benoit, K.; Daelemans, C.; Debieve, F.; Devlieger, R.; Roelens, K.; Van Nieuwenhove, Y.; Vandenberghe, G.

2026-03-31 obstetrics and gynecology 10.64898/2026.03.30.26349694 medRxiv
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Objective: To determine the incidence and clinical characteristics of surgical complications during pregnancy in women with a history of bariatric surgery. Design: A nationwide, prospective, population-based cohort study. Setting: High-risk obstetric care in Belgium: 67.6% of maternity units participated, covering 65% of all births in the study period. Participants: Pregnant women with a history of bariatric surgery presenting with a surgical complication (internal hernia, intussusception, volvulus or adhesions; anastomotic ulcer or abscess; gastric band slippage; or incisional hernia) between January 2021 and December 2022. Results: Thirty-three women experienced 35 surgical complications. Internal herniation was most common (n=25), predominantly following Roux-en-Y gastric bypass. Mean gestational age at diagnosis was 27+6 weeks. All women underwent surgical exploration within 24 hours; bowel resection was required in two cases. Caesarean section occurred in 48.5%, with 13 preterm births and one neonatal death. One woman required intensive care. No maternal death occurred. Conclusion: Surgical complications following bariatric surgery in pregnancy are uncommon but carry significant obstetric risks. All observed complications occurred after procedures involving intestinal rerouting, predominantly Roux-en-Y gastric bypass. Prompt surgical management was associated with low maternal morbidity and no mortality, but frequently resulted in preterm birth and emergency caesarean section. These findings highlight the need for a low threshold for surgical evaluation of abdominal pain in pregnant women with previous bariatric surgery and suggest that procedure type is relevant when counselling women of reproductive age.

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Real-World Matched Analysis (N=40 per group) Shows Significantly Improved Healing with Intact Fish Skin Graft vs Standard of Care in Stage 3-4 Pressure Ulcers

Miao, H.; LeBoutillier, B.; Lantis, J. C.; Fife, C.

2026-04-11 primary care research 10.64898/2026.04.08.26350429 medRxiv
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ObjectiveTo evaluate the real-world effectiveness of Intact Fish Skin Graft (IFSG) compared with standard of care (SOC) in the treatment of Stage 3-4 pressure ulcers, using clinically meaningful outcomes including wound healing rate and percent area reduction (PAR). Materials and MethodsA retrospective matched cohort study was conducted using deidentified electronic health record (EHR) data from the U.S. Wound Registry. Patients with Stage 3-4 pressure ulcers treated with IFSG (n=40) were compared to a matched SOC control group (n=40). 1:1 covariate matching was performed to reduce confounding across key patient and wound characteristics, including age, mobility status, comorbidities (e.g., diabetes, peripheral artery disease), and wound features (age, size, location, and depth). Outcomes included healed status, healed or improved rate, and percent area reduction (PAR). ResultsThe study population represented a high-risk, real-world cohort (n=40 per group), with only 37.5% ambulatory patients and a high prevalence of multiple concurrent wounds. IFSG treatment demonstrated superior clinical outcomes compared to SOC: O_LIHealed or improved: 67.5% (IFSG) vs 55.0% (SOC) (p=0.0379) C_LIO_LIHealed: 45.5% (IFSG) vs 33.3% (SOC) C_LIO_LIPercent area reduction (PAR): 49% (IFSG) vs 34% (SOC) (p=0.0028) C_LI These findings indicate statistically significant improvements in percent area reduction and in the proportion of wounds that were healed or improved with IFSG. The proportion achieving complete healing was numerically higher with IFSG than with SOC, but this difference did not reach statistical significance. ConclusionIn this real-world matched cohort analysis, Intact Fish Skin Graft demonstrated superior effectiveness compared to standard of care in the management of Stage 3-4 pressure ulcers, with improvements in healing-related outcomes and percent area reduction. These results support the use of IFSG as an effective advanced therapy for hard-to-heal pressure ulcers.

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The impact of cognitive processes associated with image recognition on visuo-vestibular interaction

Malara, P.; Tosin, A. G.; Castellucci, A.; Martellucci, S.; Musumano, L. B.; Mandala, M.

2026-04-23 otolaryngology 10.64898/2026.04.22.26351361 medRxiv
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An increasing number of studies highlight the role of saccadic remodulation in compensatory mechanisms following vestibular injury, and the reappearance of SHIMP saccades correlates with symptom improvement measured by the Dizziness Handicap Inventory (DHI). To investigate the influence of attentional processes and working memory on visuo-vestibular interaction, three independent but interrelated experiments were conducted. In the first two experiments, healthy subjects and patients with unilateral or bilateral vestibular deficits underwent vHIT in SHIMP mode and the Functional Head Impulse Test (fHIT), performed first separately and subsequently simultaneously. Mean latency and clustering of SHIMP saccades, together with Landolt C recognition rates, were analyzed. Differences between separate and combined protocols were assessed, and, in patients, correlated with symptom severity measured by the DHI, to determine whether the near-simultaneous execution of tasks mediated by shared parietal cortical substrates influenced performance. In the third experiment, vHIT in HIMP mode and fHIT were performed using separate and combined protocols to evaluate whether recognition-related cognitive load affected recovery saccade latency and clustering. Results suggest that visual recognition modulates visuo-vestibular interaction, supporting integrated dual-task protocols for ecological balance assessment and helping explain clinical discrepancies.

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Beyond Anatomical Severity: Determinants of Health-Related Quality of Life and Transition Readiness in Adolescents with Congenital Heart Disease

Abed, M.; Aiello, S.; Gill, N.; Alonso-Gonzalez, R.; Massarella, D.; Huang, R.; Morgan, C. T.

2026-05-22 cardiovascular medicine 10.64898/2026.05.20.26353746 medRxiv
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Background: Improved survival of adolescents with congenital heart disease has shifted the focus to examine health-related quality of life and address challenges in transition to adult care. We aim to describe how congenital heart disease complexity, gender, number of interventions, and Fontan circulation may affect the health-related quality of life and transition readiness of adolescents with congenital heart disease. Methods: We conducted a single-center cross-sectional study involving 536 patients aged 14 to 18 years old who attended a nurse-led, pediatric to adult care cardiac transition clinic, from 2020 to 2024. health-related quality of life was evaluated using the PedsQLTM 4.0 Generic Core Scales and the PedsQLTM 3.0 Cardiac Module. Patients were screened for anxiety and depression using the PHQ-9 and GAD-7. Transition readiness was assessed using the Transition-Q score. Results: The median age of patients was 16 years old and 44% self-identified as female. PedsQLTM 4.0 Generic had a median overall score of 77 (IQR 67?87), with no significant difference according to congenital heart disease severity. Female patients had significantly lower overall PedsQLTM 4.0 score (p=0.028) and lower physical and emotional functioning scores (p=0.005, p<0.001, respectively) when compared to males. Physical functioning scores were lower amongst patients with Fontan circulation compared to non-Fontan patients (p=0.003), although overall PedsQLTM 4.0 score and transition readiness scores were similar to those with complex biventricular congenital heart disease. Number of previous interventions were inversely associated with overall PedsQLTM 4.0 score (p=0.036). Moderate to severe symptoms of depression or anxiety were reported in 30% of screened patients and were associated with 2 significantly lower PedsQLTM 4.0 scores (p<0.001). Transition readiness was significantly lower in patients with moderate and complex compared to those with simple congenital heart disease (p<0.001). Transition readiness improved with repeat transition clinic visits (p=0.004) whereas PedsQLTM 4.0 score did not change significantly. Conclusion: In this large cohort of adolescents with congenital heart disease, health-related quality of life was lower than population norms. Female gender, higher interventional burden, and anxiety or depressive symptoms are associated with lower health-related quality of life scores rather than anatomical severity or Fontan physiology. Transition readiness was lower in complex disease; it has improved with a structured, nurse-led transition clinic, demonstrating modifiability. Consequently, adolescent congenital heart disease care requires a multidisciplinary approach including psychosocial screening, especially for high-risk groups, and structured transition planning to improve long-term outcomes.

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Prognostic Significance of Admission CK-MB and Total CPK Levels in Predicting Adverse Outcomes Among STEMI Patients

Rehman, M. U.

2026-04-15 cardiovascular medicine 10.64898/2026.04.14.26350841 medRxiv
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BackgroundST-elevation myocardial infarction (STEMI) is reported to be a leading cause of mortality worldwide. While cardiac troponins are the gold standard for myocardial injury detection but creatine kinase-MB (CK-MB) and total creatine phosphokinase (CPK) retain prognostic use in resource-limited settings. ObjectiveTo evaluate the prognostic significance of admission CK-MB and CPK levels in STEMI patients and to assess their association with hematological parameters for integrated risk stratification. MethodsThis cross-sectional study enrolled 15 consecutive STEMI patients from the Punjab Institute of Cardiology, Lahore, during January 2024. Comprehensive laboratory analysis including cardiac biomarkers (CK-MB, CPK, troponin-I, LDH), complete blood count, renal function, serum electrolytes, and metabolic parameters, was performed on admission. Pearson correlation and comparative statistical analyses were also conducted to assess the relationships between cardiac biomarkers and hematological indices. ResultsThe cohort includes 15 patients (mean age 50.1 {+/-} 12.2 years; 73.3% male). Cardiac biomarker elevation was prevalent: CK-MB was elevated in 12/15 (80%), CPK was elevated in 12/15 (80%), with concordant elevation in 11/15 (73.3%), which indicates extensive myocardial necrosis. Troponin-I showed the highest elevation rate at 13/15 (86.7%). Hematological abnormalities included anemia (60%), WBC elevation (53.3%), and RBC reduction (40%). Random glucose averaged 150.80 {+/-} 63.55 mg/dL, with 66.7% highlighted the hyperglycemia. Remarkably, electrolyte balance was preserved in all of the patients (0% sodium, potassium, and bicarbonate abnormalities), indicating maintained homeostasis. Pearson correlation analysis revealed a significant correlation between CK-MB and CPK (r = 0.615, p = 0.0126), while correlations between cardiac biomarkers and hematological parameters were weak (p > 0.05). Risk stratification identified 53.3% of patients as high-risk who required intensive management. ConclusionsCK-MB and CPK demonstrate significant concordance and retain prognostic value in STEMI patients, particularly in resource-limited settings where troponin access may be constrained. While troponin-I remains the most sensitive biomarker, combined assessment of conventional cardiac enzymes supports reliable evaluation of myocardial injury. Hematological parameters reflect systemic response but show limited correlation with cardiac biomarkers.

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Surgical outcomes in complicated appendicitis: does timing or surgeon seniority matter? A propensity score-matched analysis from the RIFT Turkey cohort

Yalcinkaya, A.; Demirli Atici, S.; Ozen, C.; Karasoy, D.; Kamer, E.; Yalcinkaya, A.; Leventoglu, S.; RIFT Turkey Study Collaborators,

2026-05-26 surgery 10.64898/2026.05.19.26353556 medRxiv
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Background: Complicated acute appendicitis carries a higher risk of postoperative morbidity relative to uncomplicated cases. It remains unclear whether surgical timing (night vs. day; weekend vs. weekday) or surgeon seniority influence short-term outcomes in this high-risk population. Methods: This was a retrospective analysis of the RIFT Turkey dataset restricted to histologically confirmed cases of complicated appendicitis who had undergone laparoscopic appendectomy. Primary exposures were surgical timing (day [n=92] vs. night [n=123]; weekday [n=172] vs. weekend [n=43]) and surgeon seniority (trainee [n=89] vs. consultant [n=126]). The primary outcome was unplanned readmission and/or reintervention within 60 days. Secondary outcomes were conversion to open surgery and length of stay (LOS) >3 days. Propensity score matching (PSM) using RIPASA score (caliper 0.05, SMD <0.1) was performed as a pre-specified sensitivity analysis for each comparison. Results: Night-time surgery was associated with higher frequencies of unplanned readmission / reintervention (12.2% vs. 6.5%; OR 1.99 [95% CI 0.74-5.35], p=0.166) and surgical conversion (9.8% vs. 3.3%; OR 3.21 [0.88-11.72], p=0.064) compared with daytime surgery, neither reaching significance. Trainee surgeons had significantly higher readmission/reintervention rates than consultants (15.7% vs. 5.6%; OR 0.32 [0.12-0.82], p=0.013). PSM-adjusted results also showed similar relationships: night vs. day (readmission OR 2.45 [0.85-7.03], p=0.09; conversion OR 2.84 [0.73-11.1], p=0.13), weekend vs. weekday (readmission OR 1.53 [0.24-9.72], p=0.65), and trainee vs. consultant (readmission OR 0.25 [0.08-0.79], p=0.013). Conclusion: Surgical timing was not significantly associated with short-term outcomes in complicated appendicitis, though night-time surgery showed a consistent trend towards higher complication rates. Surgeon seniority was the only factor independently and significantly associated with unplanned readmission and reintervention in both primary and PSM analyses, indicating the need for senior supervision during out-of-hours procedures. Keywords: complicated appendicitis; surgical timing; night surgery; weekend effect; surgeon seniority; propensity score matching; RIFT Turkey

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Optimization Of Perioperative Antibiotic Prophylaxis In Oncourology: The Role Of A Clinical Pharmacologist And Assessment Of Clinical And Economic Outcomes

Dovlatbekyan, N. M.; Ochakovskaya, I. N.; Penjoyan, A. G.; Durleshter, V. M.; Onopriev, V. V.; Avagimov, A. D.

2026-04-08 urology 10.64898/2026.04.07.26350335 medRxiv
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Objective. To evaluate the effectiveness of a bundle of interventions involving a clinical pharmacologist aimed at changing surgeons approach to perioperative antibiotic prophylaxis (PAP) in an oncourology department. Materials and Methods. A single-center retrospective observational study was conducted. Data from 226 patients who underwent prostatectomy or nephrectomy in the oncourology department of Regional Clinical Hospital No. 2 (Krasnodar, Russia) between 2023 and 2025 were analyzed. Periods before (n=125) and after (n=101) the implementation of an Antimicrobial Stewardship (AMS) strategy bundle with active participation of a clinical pharmacologist (pre-authorization, audit with feedback, education, handshake stewardship) were compared. The primary endpoint was the proportion of surgeries performed in compliance with the PAP protocol. Secondary endpoints included the incidence of infectious complications, antibiotic consumption (DDD/100 bed-days), direct costs of antibacterial drugs, dynamics of the microbial landscape, and the Drug Resistance Index (DRI). Results. After AMS implementation, the proportion of surgeries performed in accordance with the PAP protocol increased from 0% to 47.7% for prostatectomies and to 55.6% for nephrectomies. The mean duration of antibiotic use decreased from 7 to 2 days (p<0.001). Antibiotic consumption decreased by 31.2%, and costs were reduced by a factor of 4.3. The proportion of ESKAPE organisms in the microbial profile decreased from 26.3% to 16.4%. There was no statistically significant increase in the frequency of infectious complications (2.4% vs. 3.0%; p=1.000) or mortality (0% in both groups). Conclusions. AMS implementation integrating a clinical pharmacologist into the oncourology department workflow significantly improved adherence to clinical guidelines, reduced irrational antibiotic use and financial costs without compromising patient safety. This approach can serve as a model for optimizing PAP in other surgical departments. Keywords: antibiotic prophylaxis, antimicrobial stewardship, drug resistance, clinical pharmacologist, cost-benefit analysis, oncourology

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Global practices in paediatric olfactory dysfunction: a cross-sectional survey of paediatric ENT surgeons

Spencer, G. M.; Karim, K.; Dzioba, A.; Graham, M. E.; You, P.; Hummel, T.; Gellrich, J.; Coyle, P.; Burns, H.; Peer, S.; Zawawi, F.; Lechien, J. R.; Schriever, V. A.; Bhargava, E. K.; Whitcroft, K. L.

2026-06-06 otolaryngology 10.64898/2026.06.04.26354942 medRxiv
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Background: Olfactory dysfunction (OD) in children remains underdiagnosed and poorly characterised. Despite its known impacts on nutrition, quality of life, safety awareness, and psychosocial development, no standardised diagnostic or management pathway currently exists for paediatric OD. This study aimed to characterise global practice patterns and identify diagnostic and therapeutic challenges unique to paediatric care. Methodology/Principal: A 44-item cross-sectional online survey was distributed to a verified international network of paediatric otolaryngologists across 36 countries via a closed professional platform. The survey assessed five domains: diagnostic practices, management protocols, technology and innovation, education and training, and barriers to effective care. Regional grouping was used to facilitate meaningful statistical comparisons. Categorical variables were evaluated using chi-square tests, with odds ratios and 95% confidence intervals reported for significant findings. Results: Of 351 potential participants, 167 responded (47.6% response rate). Most respondents (83%) reported seeing children with OD, yet 95% saw fewer than ten such patients annually. Psychophysical testing was never performed by 54.8% of respondents, while 88.4% routinely ordered cross-sectional imaging. Testing frequency increased significantly with patient age (Cochran's Q p<0.001). The most common barriers to objective testing were insufficient training (44.3%), time constraints (29.9%), and funding limitations (28.1%). Multidisciplinary collaboration was negligible. Significant regional variation was observed across most practice domains. Conclusions: Paediatric OD care is characterised by functional underinvestigation, fragmented multidisciplinary collaboration, and systemic educational gaps. These findings support urgent development of standardised clinical guidelines, age-appropriate validated assessment tools, and formal interdisciplinary care pathways.

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CTA versus TOF-MRA for circle of Willis segmentation: Implications for hemodynamic modelling

Vikström, A.; Zarrinkoob, L.; Johannesdottir, M.; Wahlin, A.; Hellström, J.; Appelblad, M.; Holmlund, P.

2026-04-11 cardiovascular medicine 10.64898/2026.04.10.26350583 medRxiv
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Modelling of hemodynamics in the circle of Willis (CoW) depends on vascular segmentation, which may vary based on imaging modality. Computed tomography angiography (CTA) is commonly used in clinic but involves radiation and injection of contrast agents, whereas magnetic resonance angiography (MRA) offers a non-invasive alternative. This study aims to compare CoW morphology and modelled cerebral perfusion pressure of CTA and MRA segmentations, validating if MRA can replace CTA in modelling workflows. CTA and time-of-flight MRA (TOF-MRA) of the CoW was performed in 19 patients undergoing elective aortic arch surgery (67{+/-}7 years, 8 women). The CoW was semi-automatically segmented based on signal intensity thresholding. A TOF-MRA threshold was optimized against the CTA segmentation, using the CTA as reference standard. Computational fluid dynamics (CFD) modelling with boundary conditions based on subject-specific flow rates from 4D flow MRI simulated cerebral perfusion pressure in the segmented geometries. A baseline simulation and a unilateral brain inflow simulation, i.e., occlusion of a carotid, were carried out. Linear mixed models indicated there was no effect of choice of modality on either average arterial lumen area (CTA - TOF-MRA: -0.2{+/-}1.3 mm2; p=0.762) or baseline pressure drops (0.2{+/-}1.9 mmHg; p=0.257). In the unilateral inflow simulation, we found no difference in pressure laterality (-6.6{+/-}18.4 mmHg; p=0.185) or collateral flow rate (10{+/-}46 ml/min; p=0.421). TOF-MRA geometries can with signal intensity thresholding be matched to produce similar morphology and modelled cerebral perfusion pressure to CTA geometries. The modelled pressure drops over the collateral arteries were sensitive to the segmentation regardless of modality.

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QiC3: A novel automated quantitative immunohistological disease activity index for ileocolonic Crohn's disease and ulcerative colitis

Kadivar, M.; Alyamani, M.; Mori, M.; Kadivar, M.; Jonsson, J.; Hertervig, E.; Grip, O.; Svensson, L.; Erjefalt, J. S.; Marsal, J.

2026-06-09 gastroenterology 10.64898/2026.06.04.26354902 medRxiv
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Background: Histological examination of mucosal tissue in inflammatory bowel diseases (IBD) is a sensitive tool to measure disease activity, and histological remission is emerging as a potentially important treatment target. There are several existing histopathological indices, but they often encompass caveats such as not primarily having been designed to measure the degree of inflammation, encompassing subjective components with poor intra- and interindividual reproducibility, and requiring expert pathologists who are scarce, thus resulting in extended response times. Aim: To construct a new computerized, automated index to objectively measure histological disease activity in the ileal and colonic mucosa, applicable to both Crohn's disease (CD) and ulcerative colitis (UC). Materials and methods: Ileocolonic biopsies were collected from control subjects and patients with CD or UC. A group of CD patients was sampled before and after 12 weeks of anti-TNF therapy. Another group of CD and UC patients functioned as a small validation cohort. Epithelial cells, neutrophils, macrophages, and T cells were immunohistochemically stained, followed by digitalization of the color signal and computerized delineation of the epithelial and lamina propria compartments. The various immune cell types within the epithelium and the lamina propria, respectively, were enumerated, and the numbers were compared between control subjects and patients with CD or UC. Results: The numbers of neutrophils and macrophages in the epithelium, and neutrophils in the lamina propria, showed the highest sensitivity and specificity for distinguishing control-subject tissues from CD and UC tissues. These three parameters were thus chosen to construct a new index, named QiC3 1.0, that could separate tissues from control subjects and patients with CD or UC with high precision. It performed equally well in a small validation cohort of patients. The QiC3 index correlated well with previously described histopathological indices, fecal calprotectin, and endoscopic scores in UC, but showed worse correlation with endoscopic scores in CD and symptomatic scores. When applying the new index to tissues from CD patients before and after therapy, it showed good responsiveness, demonstrating a distinct amelioration in the microscopic inflammatory status that corresponded well to improvements in histopathological scores. Conclusion: We describe a new quantitative, computerized, automated, non-subjective, and response-sensitive immunohistological index (QiC3) for measuring disease activity in ileal and colonic mucosal biopsies, suitable for both CD and UC.