Publications by authors named "Ascher N"

Article Synopsis
  • * It identifies four key challenges to promoting innovation in SoHO treatments and suggests concrete solutions, emphasizing the need for collaboration, sustainability, and transparency among stakeholders.
  • * The document calls for improved regulatory frameworks that ensure global quality and safety standards for SoHO while encouraging a regulatory environment that respects altruistic donation and enhances accessibility for patients.
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Small-for-size syndrome (SFSS) following living donor liver transplantation is a complication that can lead to devastating outcomes such as prolonged poor graft function and possibly graft loss. Because of the concern about the syndrome, some transplants of mismatched grafts may not be performed. Portal hyperperfusion of a small graft and hyperdynamic splanchnic circulation are recognized as main pathogenic factors for the syndrome.

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Article Synopsis
  • * A Consensus Scientific committee, comprised of 106 members from 21 countries, conducted an in-depth literature review and reached recommendations regarding ideal graft-to-recipient weight ratios, monitoring portal pressure and flow, and diagnosing SFSS around postoperative day 7.
  • * The committee proposed a new 3-grade severity stratification system to help clinicians identify patients at risk for SFSS early on, suggesting that further studies are necessary to validate this system.
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Background: During the perioperative period of living donor liver transplantation, anesthesiologists and intensivists may encounter patients in receipt of small grafts that puts them at risk of developing small for size syndrome (SFSS).

Methods: A scientific committee (106 members from 21 countries) performed an extensive literature review on aspects of SFSS with proposed recommendations. Recommendations underwent a blinded review by an independent expert panel and discussion/voting on the recommendations occurred at a consensus conference organized by the International Liver Transplantation Society, International Living Donor Liver Transplantation Group, and Liver Transplantation Society of India.

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Article Synopsis
  • Donation after circulatory death (DCD) liver transplantation (LT) has a low occurrence in the U.S. but may provide reasonable outcomes for patients with high liver disease severity (MELD≥35).
  • Analysis from UCSF and UNOS cohorts showed similar five-year survival rates between DCD and brain death donor (DBD) liver transplants, though DCD recipients experienced more complications like biliary issues and longer hospital stays.
  • Factors such as younger donor age and recent transplant years improved survival rates; however, DCD grafts were identified as a risk factor in one cohort, indicating the need for careful candidate selection.
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Article Synopsis
  • - Small-for-size syndrome (SFSS) is a significant complication that can occur in up to 20% of patients after living donor liver transplantation (LDLT), requiring careful planning and surgical considerations to prevent it.
  • - A conference held in January 2023 led by international experts focused on developing evidence-based recommendations for predicting and managing SFSS in LDLT, utilizing a structured evaluation system.
  • - The final recommendations from one of the conference's working groups emphasize best practices in donor and recipient selection, surgical techniques, and critical care strategies to reduce the risk of SFSS in patients undergoing LDLT.
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Objective: To determine the association of sex with access to liver transplantation among candidates with the highest possible model for end-stage liver disease score (MELD 40).

Background: Women with end-stage liver disease are less likely than men to receive liver transplantation due in part to MELD's underestimation of renal dysfunction in women. The extent of the sex-based disparity among patients with high disease severity and equally high MELD scores is unclear.

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Solid organ transplantation provides the best treatment for end-stage organ failure, but significant sex-based disparities in transplant access exist. On June 25, 2021, a virtual multidisciplinary conference was convened to address sex-based disparities in transplantation. Common themes contributing to sex-based disparities were noted across kidney, liver, heart, and lung transplantation, specifically the existence of barriers to referral and wait listing for women, the pitfalls of using serum creatinine, the issue of donor/recipient size mismatch, approaches to frailty and a higher prevalence of allosensitization among women.

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Donation-after-circulatory-death (DCD), donation-after-brain-death (DBD), and living-donation (LD) are the three possible options for liver transplantation (LT), each with unique benefits and complication rates. We aimed to compare DCD-, DBD-, and LD-LT-specific graft survival and biliary complications (BC). We collected data on 138 DCD-, 3,027 DBD- and 318 LD-LTs adult recipients from a single center and analyzed patient/graft survival.

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Dr John S Najarian (1927-2020), chairman of the Department of Surgery at the University of Minnesota from 1967 to 1993, was a pioneer in surgery, clinical immunology and transplantation. A Covid-delayed Festschrift was held in his honor on May 20, 2022. The speakers reflected on his myriad contributions to surgery, transplantation, and resident/fellow training, as well as current areas of ongoing research to improve clinical outcomes.

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Background: Transplant therapy is considered the best and often the only available treatment for thousands of patients with organ failure that results from communicable and noncommunicable diseases. The number of annual organ transplants is insufficient for the worldwide need.

Methods: We elaborate the proceedings of the workshop entitled "The Role of Science in the Development of International Standards of Organ Donation and Transplantation," organized by the Pontifical Academy of Sciences and cosponsored by the World Health Organization in June 2021.

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Article Synopsis
  • Researchers wanted to find out how to tell if a redo liver transplant (redo-LT) is successful or not, especially since there aren't many organs available to transplant.
  • They looked at data from 22 hospitals from 2010 to 2018, focusing on certain patients who had a better chance of having a good outcome after the surgery.
  • They found that while most patients had a high survival rate after 1 year, those who had redo-LT for specific complications did not do as well, showing that some cases are riskier than others.
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In living donor liver transplantation, hepatic artery intimal dissection is a rare but devastating complication often resulting in the inability to utilize the graft. We detail the salvage of a dissected donor right hepatic artery utilizing the recipient hepatic artery. After removal of the right lobe, the donor artery was found to have an intimal dissection extending to multiple branches.

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Background: While preoperative physiologic evaluation of live liver donors is routinely performed to ensure donor safety and minimize complications, the optimal approach to this evaluation is unknown.

Objectives: We aim to identify predonation physiologic evaluation strategies to improve postoperative short-term outcomes, enhance donor's recovery, and reduce length of stay. We also aim to provide multidisciplinary expert panel recommendations.

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Scoring systems have been proposed to select donation after circulatory death (DCD) donors and recipients for liver transplantation (LT). We hypothesized that complex scoring systems derived in large datasets might not predict outcomes locally. Based on 1-year DCD-LT graft survival predictors in multivariate logistic regression models, we designed, validated, and compared a simple index using the University of California, San Francisco (UCSF) cohort ( = 136) and a universal-comprehensive (UC)-DCD score using the United Network for Organ Sharing (UNOS) cohort ( = 5,792) to previously published DCD scoring systems.

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Importance: Kidney transplant (KT) and liver transplant (LT) in HIV-positive patients have become more widely adopted. Data looking at long-term outcomes of patient and graft survival are lacking.

Objective: To compare the long-term outcomes of KT and LT in HIV-positive recipients with matched HIV-negative recipients.

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Background: Most patients are listed for liver transplant (LT) following extensive workup as outpatients ("conventional evaluation"). Some patients undergo urgent evaluation as inpatients after being transferred to a transplant center ("expedited evaluation"). We hypothesized that expedited patients would have inferior survival due to disease severity at the time of transplant and shorter workup time.

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Background: International travel for transplantation remains a global issue as countries continue to struggle in establishing self-sufficiency. In the United States, the United Network for Organ Sharing (UNOS) requires citizenship classification at time of waitlisting to remain transparent and understand to whom our organs are allocated. This study provides an assessment of patients who travel internationally for liver transplantation and their outcomes using the current citizenship classification used by UNOS.

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