Racial Disparity in Length of Stay Following Implementation of a Bariatric Enhanced Recovery Program.

INTRODUCTION: Enhanced Recovery Programs (ERPs) mitigate racial disparities in postoperative length of stay (LOS) for colorectal populations. It is unclear, however, if these effects exist in the bariatric surgery population. Therefore, this study aimed to evaluate the racial disparities in LOS before and after implementation of bariatric surgery ERP. METHODS: A retrospective cohort study was performed using data from a single institution. Patients undergoing minimally invasive sleeve gastrectomy or Roux-en-Y gastric bypass from 2017 to 2019 (pre-ERP) or 2020-2022 (ERP) were included. Chi-square, Kruskal-Wallis, and analysis of variance were used to compare groups, and estimated LOS (eLOS) was assessed via multivariable regression. RESULTS: Seven hundred sixty four patients were identified, including 363 pre-ERPs and 401 ERPs. Pre-ERP and ERP cohorts were similar in age (median 44.3 years versus 43.8 years, P = 0.80), race (53.4% Black versus 56.4% Black, P = 0.42), and preoperative body mass index (median 48.3 versus 49.4, P = 0.14). Overall median LOS following bariatric surgery decreased from 2 days pre-ERP to 1 day following ERP (P < 0.001). Average LOS for Black and White patients decreased by 0.5 and 0.48 days, respectively. However, overall eLOS remained greater for Black patients compared with White patients despite ERP implementation (eLOS 0.21 days, P = 0.01). CONCLUSIONS: Implementation of a bariatric surgery ERP was associated with decreased LOS for both Black and White patients. However, Black patients did have slightly longer LOS than White patients in both pre-ERP and ERP eras. More work is needed to understand the driving mechanism(s) of these disparities to eliminate them.

Hepatic Gene Expression of Angiogenic and Regeneration Markers in Cats with Congenital Portosystemic Shunts (CPSS).

Congenital portosystemic shunts (CPSS) are vascular anomalies resulting in liver hypoplasia and hepatic insufficiency. Cats with CPSS typically show signs of hepatic encephalopathy associated with increased ammonia, inflammatory cytokines, and oxidative stress. Surgical attenuation of the CPSS results in improved liver function, resolution of clinical signs, and increased portal blood flow. Hepatic gene expression has not previously been investigated in cats with CPSS. Here, we compared the hepatic expression of genes involved in the urea cycle (CPS1, NAGS), angiogenesis (VEGFR2, NPPA, NPR1, NPPC, NPR2, HIF1a), liver regeneration (SERPINB1, HGF, TGFß), and metabolism (FGF21) from a small series of cats (n = 18) with CPSS to that of control cats (n = 10). The expression of TGFß, VEGFR2, HGF, FGF21, and CPS1 was significantly elevated in liver biopsies from cats with CPSS. Cats that could only tolerate partial closure of their CPSS had increased hepatic expression of SERPINB1, HIF1a, and NPR2 compared with those that could tolerate complete ligation. Furthermore, there were no significant correlations between gene expression and pre-operative plasma ammonia concentrations in cats with CPSS. The changes in hepatic gene expression in cats with CPSS are in direct contrast to those seen in dogs with CPSS, suggesting alternative mechanisms may be involved in mediating hepatic changes in cats with CPSS.

Brief Interventions for Suicidal Youths in Medical Settings: A Meta-Analysis.

CONTEXT: Most youths who die by suicide have interfaced with a medical system in the year preceding their death, placing outpatient medical settings on the front lines for identification, assessment, and intervention. OBJECTIVE: Review and consolidate the available literature on suicide risk screening and brief intervention with youths in outpatient medical settings and examine common outcomes. DATA SOURCES: The literature search looked at PubMed, OVID, CINAHL, ERIC, and PsychInfo databases. STUDY SELECTION: Interventions delivered in outpatient medical settings assessing and mitigating suicide risk for youths (ages 10-24). Designs included randomized controlled trials, prospective and retrospective cohort studies, and case studies. DATA EXTRACTION: Authors extracted data on rates of referral to behavioral health services, initiation/adjustment of medication, follow-up in setting of assessment, suicidal ideation at follow-up, and suicide attempts and/or crisis services visited within 1 year of initial assessment. RESULTS: There was no significant difference in subsequent suicide attempts between intervention and control groups. Analysis on subsequent crisis service could not be performed due to lack of qualifying data. Key secondary findings were decreased immediate psychiatric hospitalizations and increased mental health service use, along with mild improvement in subsequent depressive symptoms. LIMITATIONS: The review was limited by the small number of studies meeting inclusion criteria, as well as a heterogeneity of study designs and risk of bias across studies. CONCLUSIONS: Brief suicide interventions for youth in outpatient medical settings can increase identification of risk, increase access to behavioral health services, and for crisis interventions, can limit psychiatric hospitalizations.

Can screen-time help? An analysis of usage of patient engagement technology following colorectal surgery.

BACKGROUND: Patient engagement technologies (PETs) guide patients through the perioperative period. We aimed to investigate the levels of patient engagement with PETs through the peri-operative period and its impact on clinical outcomes. METHODS: Retrospective cohort study of patients undergoing elective colorectal surgery from 2018 to 2022. Outcomes were length of stay, readmissions, and complications within 30 days of index hospitalization. RESULTS: 359 (89.1%) patients activated the PET. Patients completed a median of 7 surveys, 2 in-hospital health-checks, and 1 post-discharge health-check. Median LOS was 3 days, 57 (14.1%) patients were readmitted, and 56 (13.9%) had a complication. Patients who completed no surveys had longer LOS than those who completed 2 or more. Patients who were readmitted and had post-operative complications completed significantly fewer surveys and post-discharge health-checks. Completion of surveys in more phases was associated with shorter LOS and lower readmission rates. Completion of more post-discharge health-checks was associated with lower complication rate. CONCLUSIONS: The use of PETs improves patient outcomes and experiences in the perioperative period. Patients who engage more frequently with PETs have shorter LOS with lower readmission and post-operative complication rates.

A synopsis of the SAGES ADOPT course for foregut surgery and its positive impact on surgeons' confidence levels.

BACKGROUND: The Acquisition of Data for Outcomes and Procedure Transfer (ADOPT) program was established by SAGES to develop and expand individual surgeon's comfort with specific, complex operations using hands-on teaching and longitudinal mentoring. The 2022-2023 Foregut (Dominating the Hiatus) section of the course focused on hiatal hernia dissection and gastric fundoplication techniques. Our aim was to describe the experience of surgeons who participated in the course. METHODS: The hands-on component occurred in March 2022 at the SAGES annual meeting. Each expert mentor was matched to two participants. The mentors guided the surgeons through steps of a laparoscopic paraesophageal (PEH) hernia repair and fundoplication using a cadaveric model. Afterwards, monthly group webinars occurred and participants could receive individual coaching from their assigned mentor for a year. Each participant was given a pre-course survey with 3 and 12-month follow-up questionnaires. RESULTS: The majority of the 16 participants were employed in non-academic settings (87.5%). Years in practice ranged from 1 to 26, and 69% completed a fellowship. 100% completed the pre-course survey, and 53.8% responded to the 12-month post-course survey. Participant-reported effectiveness in performing a PEH hernia repair with fundoplication increased from 37.5% pre-course to 85.7% by the conclusion of the course. Confidence levels for the six core steps of the operation also increased: pre-course only 56-75% were confident with each step, this improved to 100% in four out of six steps. 85.7% said the course has changed their practice. DISCUSSION: Since inception, the ADOPT program has aimed to provide expert instruction for practicing surgeons to learn new techniques or improve their confidence in performing operations. The data for the 2022 ADOPT Foregut course shows that 1 year of participation made a positive impact on these surgeons' practices. This helps to fill in the learning gap that occurs after formal surgical training ends.

Development of a comprehensive survey to assess key socioecological determinants of health.

BACKGROUND: Although disparities in surgical outcomes are well-documented, our understanding of how socioecological factors drive these disparities remains limited. Comprehensive and efficient assessment tools are needed. This study's objective was to develop and assess the acceptability and feasibility of a comprehensive tool evaluating socioecological determinants of health in patients requiring colorectal surgery. METHODS: In the first phase, a comprehensive socioecological determinant of health assessment tool was developed. A review of validated socioecological health evaluation instruments was conducted, and a 2-step modified Delphi method addressed the length, clarity, appropriateness, and redundancy of each instrument. A comprehensive tool was then finalized. In the second phase, the tool was tested for acceptability and feasibility in adult patients requiring colorectal surgery using a theory-guided framework at 3 Alabama hospitals. Relationships between survey responses and measures of acceptability and feasibility were evaluated using results from initial pilot tests of the survey. RESULTS: In Phase 1, a modified Delphi process led to the development of a comprehensive tool that included 31 socioecological determinants of health (88 questions). Results of acceptability and feasibility were globally positive (>65%) for all domains. Overall, 83% of participants agreed that others would have no trouble completing the survey, 90.4% of respondents reported the survey was not burdensome, 97.6% of patients reported having enough time to complete the survey, and 80.9% agreed the survey was well-integrated into their appointment. CONCLUSION: An 88-item assessment tool measuring 31 socioecological determinants of health was developed with high acceptability and feasibility for patients who required colorectal surgery. This work aids in the development of research needed to understand and address surgical disparities.

Novel Umbilical Catheter Securement and Protection Device for Umbilical Line Securement during Laparotomy.

OBJECTIVE: Umbilical catheter malposition rate is high. We compared a Novel Umbilical Securement Device (NUSD) to standard methodologies for neonatal invasive care unit patients undergoing laparotomy. STUDY DESIGN: Retrospective study was performed on infants undergoing laparotomy from April 2019 to January 2023. Two neonatologists compared position of umbilical arterial catheter/umbilical venous catheter (UVC) on perioperative chest X-ray (CXRs) in patients with or without NUSD. RESULTS: Eighteen patients underwent laparotomy, of which 8 patients had NUSD (9 lines) and 10 patients did not (14 lines). In NUSD group, mean gestational age was 37 ± 4 weeks and mean birth weight was 2.3 ± 0.9 kg compared with 31 ± 8 weeks and 2.1 ± 1.4 kg in non-NUSD group, respectively. The mean age at surgery was 5 ± 7 and 5 ± 3 days, respectively. No malposition was seen in NUSD group, while 57% of UVCs (28% of lines) were malpositioned postoperatively in non-NUSD group (p = 0.048). CONCLUSION: NUSD is an umbilical catheter securement device with low malposition rate, specifically during perioperative period with heightened risk for dislodgement. KEY POINTS: · Umbilical catheters provide reliable access for neonates but have a high rate of malpositioning.. · NUSD is an umbilical catheter securement device with low malposition rate.. · NUSD can be kept in place during laparotomy and can decrease the risk of malpositioning..

Concurrent application of interferon-gamma and vincristine inhibits tumor growth in an orthotopic neuroblastoma mouse model.

PURPOSE: Tumor-associated macrophages are present within neuroblastoma, and interferon-gamma (IFN-γ) can polarize macrophages into cancer-inhibiting M1 type. We hypothesize that treating neuroblastoma with interferon-gamma (IFN-γ) can suppress tumor growth, and the concurrent treatment with IFN-γ and vincristine can lead to enhanced tumor killing as compared to vincristine alone. METHODS: We loaded IFN-γ or vincristine into silk biomaterials and recorded the amount released over time. Orthotopic, syngeneic neuroblastoma xenografts were generated by injecting 9464D cells into adrenal gland of C57BL/6 mice, and IFN-γ-loaded and/or vincristine-loaded silk biomaterials were implanted into the tumor once the tumors reached 100 mm3. Drug release at different timepoints was measured and tumor growth after different treatments were compared. RESULTS: 1-2% of IFN-γ and 70% of vincristine were released from the biomaterials by the fifth day. Combining IFN-γ and vincristine significantly slowed tumor growth as compared to the controls (12.2 ± 2.7 days to reach 800 mm3 versus 5.7 ± 1.2 days, p = 0.01), and IFN-γ alone also delayed tumor growth as compared to the controls (10.9 ± 1.5 days versus 5.7 ± 1.2 days, p = 0.001). Hematoxylin and eosin staining demonstrated tumor necrosis adjacent to the drug-loaded silk biomaterials. CONCLUSION: Local delivery of sustained release IFN-γ can inhibit neuroblastoma tumor growth by itself and in combination with vincristine.

The impact of COVID19 pandemic and government enforced lockdowns on levels of attendance and context of sexual assaults reported at Saint Marys Sexual Assault Referral Centre.

Globally, government enforced lockdowns were one measure introduced to reduce the transmission of COVID-19. The impact of these social movement restrictions on victims of sexual assault and their access of sexual assault services needed clarity. This study aimed to understand the impact of COVID-19 pandemic lockdowns on: Sexual Assault Referral Centres (SARC) attendance; characteristics of clients; characteristics of alleged perpetrators and nature of sexual assaults. Routinely collected data from the Saint Mary's SARC in the North West of England over two financial years, April 2019-March 2020 (pre-COVID-19) and April 2020-March 2021 (during COVID-19), were analysed. Compared to the pre COVID-19 year, monthly SARC attendance for children and adults decreased during national lockdowns and increased as restrictions lifted. Ethnicity of clients was significantly different during COVID-19 with more South Asian adults and more bi-racial children attending. Attendance of adults aged over 57 years also significantly increased during COVID-19. A significant increase in adults meeting alleged perpetrators online and a significant decrease in alleged perpetrators being a sex worker client were also identified. Finally, a significant increase in not-recorded data for health characteristics of adult and child clients was noted. While this study has illuminated some changes in the vulnerability profile of clients attending SARC during COVID-19 and its associated lockdowns, it has also highlighted shortcomings in changes to usual care introduced in the challenging and changing context of a global pandemic. These findings in parallel usefully recommend areas in need of service improvement.

Stem cell activation during distraction enterogenesis in the murine colon.

PURPOSE: Short bowel syndrome (SBS) is a devastating disease. We have proposed spring-mediated distraction enterogenesis for intestinal lengthening. Colonic lengthening is a potential treatment option for SBS to enhance fluid absorption capacity. We hypothesized that intraluminal spring-mediated colonic lengthening is associated with stem cell proliferation. METHODS: C57BL/6 mice underwent placement of a gelatin-encapsulated compressed or uncompressed nitinol spring in a cecal segment. Animals were given clear liquid diet until postoperative day (POD) 7, followed by regular diet until POD 14. Cecal lengths were measured at euthanasia, and tissue was formalin fixed for histological processing. For Lgr5-GFP mice, immunohistochemistry against GFP was performed to localize Lgr5+ cells within crypts. RESULTS: Significant cecal lengthening with compressed springs and shortening with uncompressed springs were observed on POD 7 and 14. Mucosa of the compressed spring group was significantly thicker on POD 14. The density of Lgr5+ cells within the crypts in the compressed spring groups was higher than that in the uncompressed spring groups on both POD 7 and 14. CONCLUSION: Expandable springs can be used to lengthen the colon in the mouse model. Colonic lengthening was associated with gradual mucosal thickening and correlated with an increased density of stem cells within the crypts.

The association of social vulnerability with colorectal enhanced recovery program failure.

Background: Enhanced recovery programs (ERPs) improve outcomes, but over 20 % of patients fail ERP and the contribution of social vulnerability is unknown. This study aimed to characterize the association between social vulnerability and ERP adherence and failure. Methods: This was a retrospective cohort study of colorectal surgery patients between 2015 and 2020 utilizing ACS-NSQIP data. Patients who failed ERP (LOS > 6 days) were compared to patients not failing ERP. The CDC's social vulnerability index (SVI) was used to assess social vulnerability. Result: 273 of 1191 patients (22.9 %) failed ERP. SVI was a significant predictor of ERP failure (OR 4.6, 95 % CI 1.3-16.8) among those with >70 % ERP component adherence. SVI scores were significantly higher among patients non-adherent with 3 key ERP components: preoperative block (0.58 vs. 0.51, p < 0.01), early diet (0.57 vs. 0.52, p = 0.04) and early foley removal (0.55 vs. 0.50, p < 0.01). Conclusions: Higher social vulnerability was associated with non-adherence to 3 key ERP components as well as ERP failure among those who were adherent with >70 % of ERP components. Social vulnerability needs to be recognized, addressed, and included in efforts to further improve ERPs. Key message: Social vulnerability is associated with non-adherence to enhanced recovery components and ERP failure among those with high ERP adherence. Social vulnerability needs to be addressed in efforts to improve ERPs.

Racial disparities in postoperative outcomes persist for patients with inflammatory bowel disease under a colorectal enhanced recovery program.

INTRODUCTION: Enhanced recovery programs (ERPs) reduce racial disparities in surgical outcomes for general colorectal surgery populations. It is unclear, however, if disparities in IBD populations are impacted by ERPs. METHODS: Retrospective study comparing IBD patients undergoing major elective colorectal operations before (2006-2014) and after (2015-2021) ERP implementation using ACS-NSQIP data. The primary outcome of length of stay (LOS) was analyzed by negative binomial regression, and secondary outcomes (complications and readmissions) by logistic regression. RESULTS: Of 466 IBD patients, 47% were pre-ERP and 53% were ERP patients. In multivariable analysis stratified by ERP period, Black race was associated with increased odds of complications in the pre-ERP (OR 3.6, 95%CI 1.4-9.3) and ERP groups (OR 3.1 95%CI 1.3-7.6). Race was not a predictor of LOS or readmission in either group. High social vulnerability was associated with increased odds of readmission pre-ERP (OR 15.1, 95%CI 2.1-136.3), but this disparity was mitigated under ERPs (OR 1.4, 95%CI 0.4-5.6). CONCLUSION: While ERPs mitigated some disparities by social vulnerability, racial disparities persist in IBD populations even under ERPs. Further work is needed to achieve surgical equity for IBD patients.

Recombinant Protein Vaccines Formulated with Enantio-Specific Cationic Lipid R-DOTAP Induce Protective Cellular and Antibody-Mediated Immune Responses in Mice.

Adjuvants are essential components of subunit vaccines added to enhance immune responses to antigens through immunomodulation. Very few adjuvants have been approved for human use by regulatory agencies due to safety concerns. Current subunit vaccine adjuvants approved for human use are very effective in promoting humoral immune responses but are less effective at promoting T-cell immunity. In this study, we evaluated a novel pure enantio-specific cationic lipid 1,2-dioleoyl-3-trimethylammonium-propane (R-DOTAP) as an immunomodulator for subunit vaccines capable of inducing both humoral- and cellular-mediated immunity. Using recombinant protein antigens derived from SARS-CoV2 spike or novel computationally optimized broadly reactive influenza antigen (COBRA) proteins, we demonstrated that R-DOTAP nanoparticles promoted strong cellular- and antibody-mediated immune responses in both monovalent and bivalent vaccines. R-DOTAP-based vaccines induced antigen-specific and polyfunctional CD8+ and CD4+ effector T cells and memory T cells, respectively. Antibody responses induced by R-DOTAP showed a balanced Th1/Th2 type immunity, neutralizing activity and protection of mice from challenge with live SARS-CoV2 or influenza viruses. R-DOTAP also facilitated significant dose sparing of the vaccine antigens. These studies demonstrate that R-DOTAP is an excellent immune stimulator for the production of next-generation subunit vaccines containing multiple recombinant proteins.

Disparities in Perioperative Use of Patient Engagement Technologies - Not All Use is Equal.

OBJECTIVE: To determine the association of patient-level characteristics on the use of a patient engagement technology during the perioperative period. SUMMARY OF BACKGROUND DATA: As implementation of patient engagement technologies continues to grow, it remains unclear who uses, and not uses, these technologies. Existing literature suggests significant disparities in usage of other technologies by patient age, race, sex, and geographic location, however, have yet to characterize patient usage of patient engagement technologies. METHODS: This is a retrospective cohort study of patients undergoing elective surgery by a colorectal surgeon between January 2018 and March 2020 who enrolled in a patient engagement technology at a single institution. Patients enrolled received educational content, healthcare reminders, patient reported outcome (PRO) surveys, and health checks preoperatively, in-hospital, and for 30-days postdischarge. The primary outcome was patient activation of the patient engagement technology. Secondary outcomes were completion of at least 1 PRO survey, 1 in-hospital health check, and 1 postdischarge health check. RESULTS: Of 549 patients who enrolled in the patient engagement technology, 473 (86.2%) activated. On multivariable stepwise regression, female patients [odds ratio (OR) 2.4, confidence interval (CI) 1.4-4.0, P = 0.001] and privately insured patients (OR 2.0, CI 1.1-3.8, P = 0.03) were more likely to activate. Black patients were less likely to activate (OR 0.5, CI 0.3-0.9, P = 0.02). Once activated, privately insured patients were more likely to complete PRO surveys (OR 2.3, CI 1.2-4.3, P = 0.01), in-hospital health checks (OR 2.4, CI 1.4-4.1, P = 0.002), and postdischarge health checks (OR 1.9, CI 1.1 -3.3, P < 0.001) than uninsured patients. Black patients were less likely to complete PRO surveys (OR 0.4, CI 0.3-0.7, P = 0.001) and in-hospital health checks (OR 0.6, CI 0.4-0.9, P = 0.03) than White patients. CONCLUSIONS: Use of a patient engagement technology in the perioperative period differs significantly by sex, race/ethnicity, and insurance status. These technologies may not be used equally by all patients, which should be considered during implementation of interventions to improve surgical outcomes.

Long-term safety of intraluminal spring-mediated bowel lengthening.

PURPOSE: The purpose of the study is to examine the long-term safety of an endoluminal bowel lengthening device prior to its use in the first human trial. In addition, device performance and natural passage will be evaluated. METHODS: Endoluminal lengthening springs were surgically placed into the jejunum of Yucatan minipigs using the Eclipse XL1 device. A matching internal control segment of jejunum was marked at the time of operation. Weekly weights and fluoroscopic studies were obtained to evaluate spring deployment and position until devices passed. Animals were euthanized at 28, 60, 90, and 180 days. At necropsy, length measurements were recorded, and histopathologic analysis was performed. RESULTS: There were no bowel obstructions or overt perforations attributable to the device. All surviving animals gained weight and were clinically thriving. All devices passed out of the rectum by 180 days. Bowel lengthening was seen in all experimental segments, and minimal fibrosis was observed by 180 days. CONCLUSION: Jejunal lengthening persisted after device had passed through the intestinal tract after 180 days. Early histopathologic changes of the jejunum during distraction enterogenesis normalized over time.

The effect of spring diameter on porcine ileal distraction enterogenesis.

PURPOSE: Spring-mediated distraction enterogenesis has proven to be successful for intestinal lengthening. We aimed to evaluate the effect of spring diameter mismatch on intestinal adaptation. METHODS: Juvenile mini-Yucatan pigs underwent placement of compressed nitinol springs with diameter of 10, 11, or 12 mm into the ileal lumen. Pigs were euthanized on postoperative day 7. The lengths, histology, total area of blood vessels, and enteric ganglia were evaluated. RESULTS: All spring groups exhibited significant ileal lengthening. Across the different diameters, spring-expanded segments were similar in terms of ileal lengthening, crypt height, muscular thickness, blood vessels, and enteric ganglia area. CONCLUSION: Spring-mediated distraction enterogenesis is successful in the porcine ileum. A smaller diameter spring is as effective as a larger diameter spring in lengthening the ileum. Springs of varying diameters result in comparable structural changes in the ileum.

Retrospective Evaluation of Short-Term Outcomes of an Enhanced Recovery Protocol for Patients Undergoing Complex Abdominal Wall Reconstruction.

BACKGROUND: Enhanced recovery protocols (ERPs) have the potential to streamline care and improve short-term outcomes for surgical patients. However, for patients undergoing modern iterations of complex abdominal wall reconstruction (AWR), little literature exists on the effectiveness of these protocols. STUDY DESIGN: In this retrospective study we reviewed our institutional experience with complex AWR throughout a 2-year period with 1 year immediately before and 1 year after implementation of our ERP. Patients undergoing primarily minimally invasive complex AWR who were compliant with 11 elements of our ERP were compared with patients who received surgery before implementation of the protocol or did not meet these criteria. Baseline patient characteristics and patient outcomes including hospital length of stay, narcotic usage, and readmission were compared across groups. Multivariable regression models were used to estimate the associations of our ERP protocol with outcomes adjusting for surgical approach. RESULTS: Median length of stay for the overall cohort (n = 132) was 3 days (interquartile range 1 to 4). Morbidity and mortality rates were 22.6% and 0.7%, respectively. ERP patients were less likely to have a complication (ERP compliant 8.7% [n = 46] vs non-ERP 30.2% [n = 86], p < 0.01), had a shorter median postoperative length of stay (median 1 vs 3 days, p < 0.01), and received fewer morphine equivalents (median 30.8 vs 45 mg, p < 0.01). Readmission rate for ERP patients did not differ significantly vs non-ERP patients (6.5% vs 11.8%, p = 0.34). CONCLUSIONS: Use of ERPs in patients undergoing complex AWR may provide benefits for both patients and hospitals.

Generation of Porcine Ileum Through Spring-Mediated Mechanical Distraction.

INTRODUCTION: Short bowel syndrome is a devastating gastrointestinal disorder in which decreased bowel length results in inadequate absorption causing nutritional deficiencies. Current treatment options are accompanied by significant morbidity. We have proposed spring-mediated distraction enterogenesis as a method to lengthen bowel with success seen in porcine jejunum. We hypothesize that spring-mediated distraction enterogenesis can be demonstrated in porcine ileum with preservation of ileal structure and function. MATERIALS AND METHODS: Laparotomy was performed on juvenile female mini-Yucatan pigs and a gelatin-encapsulated compressed nitinol spring was inserted into the ileal lumen and affixed proximally and distally. A control segment distal to the spring segment was marked with sutures. Postoperatively, pigs were placed on a liquid diet and euthanized on postoperative day 7. Spring and control segments were measured and processed for immunohistochemistry to evaluate for the presence of vitamin B12-intrinsic factor cotransporter, chromogranin A-producing cells, and 5-HT producing cells. RESULTS: All seven pigs survived to postoperative day 7 with no adverse effects. On average, pigs gained 84.3 ± 66.4 g/d. Spring segments lengthened 1.5 ± 0.7 cm with a relative lengthening by 128% ± 56%, which was statistically significant when compared to control (P < 0.01). The average density of chromogranin-A cells in control compared to spring segments was not significantly changed (2.9 ± 1.1 cells/mm versus 3.2 ± 1.2 cells/mm, P = 0.17). Both vitamin B12-intrinsic factor cotransporter and 5-HT producing cells were present in both control and lengthened ileum. CONCLUSIONS: Intraluminal nitinol springs significantly lengthened porcine ileum. The increase in density of enteroendocrine cells may indicate enhanced endocrine function of the lengthened ileum.

Inertial Sensor Estimation of Initial and Terminal Contact during In-Field Running.

Given the popularity of running-based sports and the rapid development of Micro-electromechanical systems (MEMS), portable wireless sensors can provide in-field monitoring and analysis of running gait parameters during exercise. This paper proposed an intelligent analysis system from wireless micro-Inertial Measurement Unit (IMU) data to estimate contact time (CT) and flight time (FT) during running based on gyroscope and accelerometer sensors in a single location (ankle). Furthermore, a pre-processing system that detected the running period was introduced to analyse and enhance CT and FT detection accuracy and reduce noise. Results showed pre-processing successfully detected the designated running periods to remove noise of non-running periods. Furthermore, accelerometer and gyroscope algorithms showed good consistency within 95% confidence interval, and average absolute error of 31.53 ms and 24.77 ms, respectively. In turn, the combined system obtained a consistency of 84-100% agreement within tolerance values of 50 ms and 30 ms, respectively. Interestingly, both accuracy and consistency showed a decreasing trend as speed increased (36% at high-speed fore-foot strike). Successful CT and FT detection and output validation with consistency checking algorithms make in-field measurement of running gait possible using ankle-worn IMU sensors. Accordingly, accurate IMU-based gait analysis from gyroscope and accelerometer information can inform future research on in-field gait analysis.