Momentum-dependent scaling exponents of nodal self-energies measured in strange metal cuprates and modelled using semi-holography.

The anomalous strange metal phase found in high-Tc cuprates does not follow the conventional condensed-matter principles enshrined in the Fermi liquid and presents a great challenge for theory. Highly precise experimental determination of the electronic self-energy can provide a test bed for theoretical models of strange metals, and angle-resolved photoemission can provide this as a function of frequency, momentum, temperature and doping. Here we show that constant energy cuts through the nodal spectral function in (Pb,Bi)2Sr2-xLaxCuO6+δ have a non-Lorentzian lineshape, consistent with a self-energy that is k dependent. This provides a new test for aspiring theories. Here we show that the experimental data are captured remarkably well by a power law with a k-dependent scaling exponent smoothly evolving with doping, a description that emerges naturally from anti-de Sitter/conformal-field-theory based semi-holography. This puts a spotlight on holographic methods for the quantitative modelling of strongly interacting quantum materials like the cuprate strange metals.

Endoscopic outcomes using a novel through-the-scope tack and suture system for gastrointestinal defect closure: a systematic review and meta-analysis.

BACKGROUND: Closure of gastrointestinal defects can reduce postprocedural adverse events. Over-the-scope clips and an over-the-scope suturing system are widely available, yet their use may be limited by defect size, location, operator skill level, and need to reinsert the endoscope with the device attached. The introduction of a through-the-scope helix tack suture system (TTSS) allows for closure of large irregular defects using a gastroscope or colonoscope, without the need for endoscope withdrawal. Since its approval 3 years ago, only a handful of studies have explored outcomes using this novel device. METHODS: Multiple databases were searched for studies looking at TTSS closure from inception until August 2023. The primary outcomes were the success of TTSS alone and TTSS with clips for complete defect closure. Secondary outcomes included complete closure based on procedure type (endoscopic mucosal resection [EMR], endoscopic submucosal dissection [ESD]) and adverse events. RESULTS: Eight studies met the inclusion criteria (449 patients, mean defect size 34.3 mm). Complete defect closure rates for TTSS alone and TTSS with adjunctive clips were 77.2% (95%CI 66.4-85.3; I2=79%) and 95.2% (95%CI 90.3-97.7; I2=42.5%), respectively. Complete defect closure rates for EMR and ESD were 99.2% (95%CI 94.3-99.9; I2 = 0%) and 92.1% (95%CI 85-96; I2=0%), respectively. The adverse event rate was 5.4% (95%CI 2.7-10.3; I2=55%). CONCLUSION: TTSS is a novel device for closure of postprocedural defects, with relatively high technical and clinical success rates. Comparative studies of closure devices are needed.

Adverse Events of Endoscopic Clip Placement: A MAUDE Database Analysis.

BACKGROUND: Clips are endoscopic mechanical devices with tensile and closure strength that can approximate tissue and provide hemostasis through a tamponade effect. Clips are ubiquitously used in endoscopic practice, and numerous studies have validated the clinical efficacy of clips, with recent guidelines recommending them as a first-line intervention for recurrent and persistent nonvariceal gastrointestinal bleeding. However, the safety profile for these devices has yet to be delineated, thus, we aim to investigate this feature by examining the adverse events reported to the Food and Drug Administration. METHODS: Postmarketing surveillance data from the Food and Drug Administration Manufacturer And User Facility Device Experience database were analyzed from January 2012 to January 2021. The Manufacturer And User Facility Device Experience database is a reporting software and does not independently verify the details of complications. RESULTS: Two thousand five hundred forty reports were issued, of which 287 were patient adverse events and 2766 were device problems. Activation, separation, and positioning issues were most common. No consequences or clinically significant impact on patients were seen in 1968 reports. Foreign bodies were seen in 97 cases, hemorrhage in 57 cases, tissue damage in 42 cases, embedded clips in tissues/plaques in 16 cases, perforation in 15 cases, lacerations in 6 cases, and infection in 3 cases. CONCLUSIONS: While the most commonly reported device problems involved activation, separation, and positioning, most patients were clinically unaffected. Moreover, perforation and infection were exceedingly rare, further highlighting the safety profile of endoscopic clips.

Successful Treatment of Intractable Rectal Varices with Gelfoam Slurry Embolisation and Coiling.

A 57-year-old male with heart failure and decompensated alcoholic liver cirrhosis presented with recurrent haematochesia due to rectal varices. After multiple failed therapy with endoscopic band ligation and surgical sclerotherapy, a discussion with an interventional radiologist was arranged. A transjugular intrahepatic portosystemic shunt (TIPS) was deferred due to a history of heart failure. A shared decision to proceed with transhepatic Gelfoam® slurry embolisation with coiling was made. During the procedure, a variant anatomy of the superior rectal vein was identified. The superior rectal vein was found to drain directly into the left portal vein with no connectivity between the inferior mesenteric vein and the rectal varices. As planned, Gelfoam slurry embolisation and coiling was done to the left and right superior rectal vein along with the common trunk it drains. The patient did not develop any further episodes of gastrointestinal bleeding or worsening ascites on follow-up after 6 months. This case represents a successful treatment of bleeding rectal varices when TIPS is contraindicated. LEARNING POINTS: Rectal varices are an infrequent outcome of portal hypertension formed by portocaval anastomosis between the superior rectal vein with the inferior mesenteric vein of the portal system upstream, and the middle and inferior rectal vein draining into the internal iliac and internal pudendal vein of the systemic circulation, respectively. Portal system variations are extremely rare.Most common modality of recurrent rectal varices bleed is a transhepatic intrajugular portosystemic shunt. The absolute contraindications to this include congestive heart failure among others.In the presence of multiple co-morbidities and contraindication for TIPS, various interventional radiological modalities on a case-by-case basis are available including percutaneous transhepatic rectal varices obliteration.

Hemostatic spray (TC-325) vs. standard endoscopic therapy for non-variceal gastrointestinal bleeding: A meta-analysis of randomized controlled trials.

Background and study aims Hemospray (TC-325) is a mineral powder with adsorptive properties designed for use in various gastrointestinal bleeding (GIB) scenarios. We conducted a systematic review & meta-analysis of randomized controlled trials (RCTs) comparing TC-325 to standard endoscopic therapy (SET) for non-variceal GIB (NVGIB). Methods Multiple databases were searched through October 2022. Meta-analysis was performed using a random-effects model to determine pooled relative risk (RR) and proportions with 95 % confidence intervals (CI) for primary hemostasis, hemostasis failure, 30-day rebleeding, length of stay (LOS), and need for rescue interventions. Heterogeneity was assessed using I 2 %. Results Five RCTs with 362 patients (TC-325 178, SET 184) - 123 females and 239 males with a mean age 65 ±â€Š16 years). The most common etiologies were peptic ulcer disease (48 %), malignancies (35 %), and others (17 %). Bleeding was characterized as Forrest IA (7 %), IB (73 %), IIA (3 %), and IIB (1 %). SET included epinephrine injection, electrocautery, hemoclips, or a combination. No statistical difference in primary hemostasis between TC-325 compared to SET, RR 1.09 (CI 0.95-1.25; I 2 43), P =  0.2, including patients with oozing/spurting hemorrhage, RR 1.13 (CI 0.98-1.3; I 2 35), P =  0.08. Failure to achieve hemostasis was higher in SET compared to TC-325, RR 0.30 (CI 0.12-0.77, I 2 0), P =  0.01, including patients with oozing/spurting hemorrhage, RR 0.24 (CI 0.09 - 0.63, I 2 0), P =  0.004. We found no difference between the two interventions in terms of rebleeding, RR 1.13 (CI 0.62-2.07, I 2 26), P =  0.8 and LOS, standardized mean difference (SMD) 0.27 (CI, -0.20-0.74; I 2 62), P =  0.3. Finally, pooled rate of rescue interventions (angiography) was statistically higher in SET compared to TC-325, RR 0.68 (CI 0.5-0.94; I 2 0), P =  0.02. Conclusions Our analysis shows that for acute NV GIB, including oozing/spurting hemorrhage, TC-325 does not result in higher rates of primary hemostasis compared to SET. However, lower rates of failures were seen with TC-325 than SET. In addition, there was no difference in the two modalities when comparing rates of rebleeding and LOS.

Reply to Lissing et al. Comment on "Ramai et al. Risk of Hepatocellular Carcinoma in Patients with Porphyria: A Systematic Review. Cancers 2022, 14, 2947".

We thank Dr. Lissing and colleagues for providing us with these helpful comments [...].

Efficacy & safety of EUS-directed transgastric endoscopic retrograde cholangiopancreatography (EDGE) in Roux-en-Y gastric bypass anatomy: a systematic review & meta-analysis.

BACKGROUND: In patients with Roux-en-Y gastric bypass (RYGB) anatomy, laparoscopic endoscopic retrograde cholangiopancreatography (LA-ERCP) and enteroscopy-assisted ERCP (E-ERCP) have been utilized to achieve pancreaticobiliary access. Endoscopic ultrasound-directed transgastric endoscopic retrograde cholangiopancreatography (EDGE) has recently emerged as an alternate and efficient approach. As data regarding EDGE continues to evolve, concerns about safety and efficacy remain, limiting wide adoptability. We performed a systematic review and meta-analysis to assess the safety and efficacy of EDGE and compare it to the current standard of care. METHODS: A comprehensive search of major databases (inception to Nov 2022) identified published studies on EDGE. A random-effects model was used to calculate the pooled rates and heterogeneity (I2). Risk ratio (RR) and standardized difference in means (SMD) were utilized for head-to-head comparison analysis between EDGE vs. LA-ERCP and EDGE vs. E-ERCP. Primary outcomes assessed pooled EDGE safety (adverse events) and efficacy (technical/clinical success). Secondary outcomes assessed efficacy and safety profiles via a comparative analysis of EDGE vs. LA-ERCP and EDGE vs. E-ERCP. RESULTS: A total of 16 studies (470 patients) were included. EDGE pooled technical success (TS) rate was 96% (95% CI 92-97.6, I2 = 0), and clinical success was 91% (85-95, I2 = 0). Pooled rate of all adverse events with EDGE was 17% (14-24.6, I2 = 32%). On sub-group analysis, these included failure of fistula closure 17% (10-25.5, I2 = 48%), stent migration 7% (4-12, I2 = 51%), bleeding 5% (3.2-7.9, I2 = 0), post-EDGE weight gain 4% (2-9, I2 = 0), perforation 4% (2.1-5.8, I2 = 0), and post-ERCP pancreatitis 2% (1-5, I2 = 0). EDGE TS was comparable to LA-ERCP (97% vs. 98%; RR, 1.00; CI, 0.85-1.17, p = 0.95) and E-ERCP (100% vs. 66%; RR, 1.26; CI, 0.99-1.6, p = 0.06). No statistical difference was noted in adverse events between EDGE and LA-ERCP (13% vs. 17.6%; RR, 0.61; CI, 0.28-1.35, p = 0.52) and E-ERCP (9.6% vs. 16%; RR, 0.61; CI, 0.28-1.35, p = 0.22). EDGE procedure time and hospital stay were shorter than LA-ERCP and E-ERCP (p < 0.001). CONCLUSION: Our analysis shows that EDGE is safe and efficacious to the current standard of care. Further head-to-head comparative trials are needed to validate our findings.

Early (<4 weeks) versus standard (≥4 weeks) endoscopic drainage of pancreatic walled-off fluid collections: a systematic review and meta-analysis.

BACKGROUND AND AIMS: Previous studies have demonstrated that the ideal time for drainage of walled-off pancreatic fluid collections is 4 to 6 weeks after their development. However, some pancreatic collections, notably infected pancreatic fluid collections, require earlier drainage. Nevertheless, the optimal timing of the first intervention is unclear, and consensus data are sparse. The aim of this study was to evaluate the clinical efficacy and safety of EUS-guided drainage of pancreatic fluid collections <4 weeks after development compared with ≥4 weeks after development. METHODS: Search strategies were developed for PubMed, Embase, and Cochrane Library databases from inception. Outcomes of interest were technical success, defined as successful endoscopic placement of a lumen-apposing metal stent; clinical success, defined as a reduction in cystic collection size; and procedure-related adverse events. A random-effects model was used for analysis, and results are expressed as odds ratio (OR) with 95% confidence interval (CI). RESULTS: Six studies (630 patients) were included in our final analysis, in which 182 patients (28.9%) were enrolled in the early drainage cohort and 448 patients (71.1%) in the standard drainage cohort. The mean fluid collection size was 143.4 ± 18.8 mm for the early cohort versus 128 ± 19.7 mm for the standard cohort. Overall, technical success was equal in both cohorts. Clinical success did not favor either standard drainage or early drainage (OR, .39; 95% CI, .13-1.22; P = .11). No statistically significant differences were found in overall adverse events (OR, 1.67; 95% CI, .63-4.45; P = .31) or mortality (OR, 1.14; 95% CI, .29-4.48; P = .85). Hospital stay was longer for patients undergoing early drainage compared with standard drainage (23.7 vs 16.0 days, respectively). CONCLUSIONS: Both early (<4 weeks) and standard (≥4 weeks) drainage of walled-off pancreatic fluid collections offer similar technical and clinical outcomes. Patients requiring endoscopic drainage should not be delayed for 4 weeks.

The diagnostic performance of probe-based confocal laser endomicroscopy in the detection of gastric cancer: a systematic review and meta-analysis.

Background: Gastric cancer (GC) represents a significant global health burden with high morbidity and mortality, especially when diagnosed at advanced stages. Therefore, early detection of GC is critical. Probe-based confocal laser endomicroscopy (pCLE) is a new evolving technology that uses real-time, high-resolution imaging to inspect the mucosa at the cellular and microvascular level, using a confocal probe. Widespread studies using pCLE are limited at the current time. We aimed to investigate the diagnostic efficacy of this modality for the detection of GC. Methods: Multiple databases were searched from inception until November 2021. The diagnostic performance of pCLE was assessed by calculating its sensitivity, specificity and accuracy for the detection of GC, using pooled proportions and 95% confidence intervals (CI) with a random-effects model. Heterogeneity was assessed using I2. Results: Seven studies were included, with a total of 567 patients (mean age 61.7 years, 364 males). Pooled performance metrics of pCLE included a sensitivity of 87.9% (95%CI 81.4-92.4; P<0.001; I2=0%), specificity 96.5% (95%CI 91.5-98.6; P<0.001; I2=51.84%), and an accuracy of 94.7% (95%CI 89.5-97.4; P<0.001; I2=65.44%). Conclusions: pCLE is a highly effective diagnostic modality for detecting GC. Larger, randomized controlled studies are needed to determine its role in daily practice compared to conventional endoscopic practices.

Risk of Hepatocellular Carcinoma in Patients with Porphyria: A Systematic Review.

Acute porphyrias are a group of metabolic disorders resulting in defective porphyrin synthesis and reduced heme production, which carries a risk of malignancy. Porphyrias are inborn defects in the heme biosynthesis pathway resulting in neurovisceral manifestations and cutaneous photosensitivity attacks with multi-systemic involvement. Its estimated prevalence nears 5 per 100,000 patients worldwide. Subclinical liver disease is common, which can progress into transaminitis, fibrosis, cirrhosis, and malignancy. However, data on the incidence of primary liver cancer are lacking. We aim to determine the risk of hepatocellular carcinoma (HCC) in patients with porphyria. A systematic review and pooled analysis were conducted through 2021 on studies assessing blood tests, imaging, cancer development, liver transplant, surgical resection, and outcomes in porphyria. In total, 19 studies, which included 7381 patients with porphyria (3476 females), were considered for the final review. In eight studies, alpha-fetoprotein levels were elevated between 200 and 1000 IU/mL. Of the total cohort of patients with porphyria, primary liver cancer was diagnosed in 351 patients (4.8%), of whom 243 (3.3% of the total) were found to have HCC. A subset of patients was found to have cholangiocarcinoma (n = 18; 0.3% of the total). Interestingly, advanced liver disease or cirrhosis was not a prerequisite for the formation of HCC in a small group of patients. Of the total cohort, 30 patients underwent liver resection, 48 patients underwent liver transplantation, and 327 patients died. Patients with porphyria are at risk of developing primary liver malignancy. Further studies should aim to develop diagnostic and prognostic models aimed at the early detection of HCC in porphyria.

Acute organoaxial gastric volvulus-A dangerous twist.

Acute gastric volvulus is a rare yet life-threatening condition with mortality ranging from 30% to 50% if not treated promptly. The stomach rotates on itself causing strangulation precipitating necrosis, cameron lesions, and perforation. Long-standing paraesophageal hernia is a common cause of organoaxial gastric volvulus.

Direct percutaneous endoscopic jejunostomy (DPEJ) and percutaneous endoscopic gastrostomy with jejunal extension (PEG-J) technical success and outcomes: Systematic review and meta-analysis.

Background and study aims Endoscopic methods of delivering uninterrupted feeding to the jejunum include direct percutaneous endoscopic jejunostomy (DPEJ) or PEG with jejunal extension (PEG-J), validated from small individual studies. We aim to perform a meta-analysis to assess their effectiveness and safety in a variety of clinical scenarios. Methods Major databases were searched until June 2021. Efficacy outcomes included technical and clinical success, while safety outcomes included adverse events (AEs) and malfunction rates. We assessed heterogeneity using I 2 and classic fail-safe to assess bias. Results 29 studies included 1874 patients (983 males and 809 females); mean age of 60 ±â€Š19 years. Pooled technical and clinical success rates with DPEJ were 86.6 % (CI, 82.1-90.1, I 2 73.1) and 96.9 % (CI, 95.0-98.0, I 2 12.7). The pooled incidence of malfunction, major and minor AEs with DPEJ were 11 %, 5 %, and 15 %. Pooled technical and clinical success for PEG-J were 94.4 % (CI, 85.5-97.9, I 2 33) and 98.7 % (CI, 95.5-99.6, I 2  < 0.001). The pooled incidence of malfunction, major and minor AEs with DPEJ were 24 %, 1 %, and 25 %. Device-assisted DPEJ performed better in altered gastrointestinal anatomy. First and second attempts were 87.6 % and 90.2 %. Conclusions DPEJ and PEG-J are safe and effective procedures placed with high fidelity with comparable outcomes. DPEJ was associated with fewer tube malfunction and failure rates; however, it is technically more complex and not standardized, while PEG-J had higher placement rates. The use of balloon enteroscopy was found to enhance DPEJ performance.

Proton Pump Inhibitors Versus Histamine-2-Receptor Antagonists for Stress Ulcer Prophylaxis in Critically Ill Patients: A Meta-analysis and Trial Sequential Analysis.

GOALS AND BACKGROUND: Stress ulcer prophylaxis has been shown to lower gastrointestinal bleeding (GIB) rates. Various agents have been studied, and the optimal strategy continues to be contested. This study evaluates the efficacy between proton pump inhibitors (PPIs) and histamine-2-receptor antagonists. Small sample sizes and methodology flaws limited prior studies. STUDY: A systematic search of MEDLINE, EMBASE, CENTRAL, Web of Science, and ClinicalTrials.gov for randomized controlled trials reporting the use of PPI and histamine-2-receptor antagonist reporting rates of GIB and standardized intensive care outcomes. Risk ratios (RR) and standardized mean difference (SMD) with 95% confidence intervals (CIs). A trial sequential analysis was performed to guard against errors. RESULTS: A total of 14 randomized controlled trials of 28,526 patients with a mean age of 57.83±17.35 years and 30.82% females. In our pooled analysis, PPI outperformed its comparator (RR: 0.68; 95% CI: 0.57-0.82) in clinically significant GIB. PPI re-demonstrated significant reduction in overt GIB (RR: 0.61; 95% CI: 0.39-0.97). No differences between groups was noted toward all-cause mortality (RR: 1.05; 95% CI: 1.00-1.10) or incidence of pneumonia (RR: 1.11; 95% CI: 0.82-1.51). Duration of stay (SMD: 0.07; 95% CI: -0.04-0.17) and ventilator days (SMD: 0.01; 95% CI: -0.01-0.04) were indifferent between the groups. CONCLUSIONS: Among critically ill patients, PPI was associated with reduced clinically significant or overt GIB. No differences in pneumonia were seen with the use of either agent. Trial sequential analysis for clinically significant GIB ruled out the risk for false-positive results, and thereby it is unlikely that future trials will affect our conclusions.

Co-creation as an innovative setting to improve the uptake of scientific knowledge: overcoming obstacles, understanding considerations and applying enablers to improve scientific impact in society.

Impact-driven research is a EU priority and, increasingly, for universities around Europe. Still, there is need for specific strategies to improve the societal impact of scientific knowledge and therewith improve the uptake of scientific results. Co-creation deeply evolves the role of scientific knowledge and increases its impact. Albeit there is much research on the conceptualization and contextualization of co-creation, research on the microlevel dynamics of co-creation is less common. This article aims to understand the dynamics of and clarify the role of co-creation within and between quadruple helix actors (academia, government, industry and societal partners). Here, co-creation refers to the collaboration, where such actors actively join forces to address challenges. This paper revolves around insights from the European Commission Horizon 2020-project-Accomplissh (www.accomplissh.eu) which stands for "Accelerate co-creation by setting up a multi-actor platform for impact from Social Sciences and Humanities". The results lay bare a set of obstacles, areas of consideration and enablers in co-creation. This said, it is argued that scientific knowledge is optimally utilized when a set of guidelines or recommendations are followed and carried out by all involved actors.

When Variants Collide: An Unusual Presentation of Metastatic Gastric Mixed Neuroendocrine-Non-Neuroendocrine Neoplasm.

Gastrointestinal neuroendocrine neoplasms were recently reclassified into the 2019 World Health Organization schema into well-differentiated neuroendocrine tumors, poorly differentiated neuroendocrine carcinomas, and mixed neuroendocrine-non-neuroendocrine neoplasms (MiNENs). Among these, gastric MiNENs are exceedingly rare and often metastasize quickly without diagnostic clues. We present a refractory gastric MiNEN with unique presenting features. This case highlights the clinical spectrum of these tumors, the importance of accurate histochemical interpretation, and clinical management in the absence of formalized guidelines. Future therapies looking at novel targets and palliative symptom relief are needed.

Line it up-Inadvertent placement of nasogastric tube in pleural space resulting in iatrogenic empyema.

Dobhoff tubes, used for post-pyloric feedings, have a weighted metal end with a small diameter that enhances their flexibility to traverse the gastrointestinal tract. Unfortunately, the metal stylet can iatrogenically perforate surrounding structures in patients with diminished cough and gag (1), and extreme caution should be considered before its utilization.