Publications by authors named "Allison Ammann"

Introduction: Previous literature suggests that sphingolipids may impact systemic coagulation and platelet aggregation, thus modulating the risks of thrombotic events. The goal of this investigation was to evaluate the role of serum sphingolipids on intrinsic platelet function to assess whether pharmacologic manipulation of sphingolipid metabolites would impact platelet aggregability.

Methods: C57BL/6J mice were injected with either normal saline, 1 mg/kg FTY720 (synthetic sphingosine-1-phosphate [S1P] receptor analog), or 5 mg/kg SLM6031434 (sphingosine kinase two inhibitor).

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Article Synopsis
  • In April 2023, the National Comprehensive Cancer Network recommended neoadjuvant immunotherapy for certain patients with nonmetastatic mismatch repair deficient colon cancer, a subtype that comprises about 15% of colon cancers and responds well to immune treatments.
  • A review of the literature identified 8 relevant studies out of 7691, focusing on safety and efficacy of this treatment, which included diverse agents and treatment durations.
  • Results showed high rates of complete surgical resection (98%-100%) and significant pathological response rates (50%-91% achieving ypT0N0), with manageable safety profiles as most adverse events were mild to moderate.
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Introduction: Grade-C postoperative pancreatic fistulas (POPFs) are dreaded complications following pancreaticoduodenectomy. The aim of this study was to quantify the incidence and risk factors associated with grade C POPF in a national database.

Methods: The National Surgical Quality Improvement Program targeted user files were queried for patients who underwent elective pancreaticoduodenectomy (2014-2020).

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Background: The aim of this study was to examine sex differences in academic rank and productivity among members of the American Society of Transplant Surgeons in the United States.

Methods: Cross-sectional, focusing on current board-certified abdominal transplant surgeons in the United States. Demographic factors such as sex, region, and faculty rank were collected from institutional websites.

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Breast infections are common, affect women of all ages, and are associated with significant morbidity. Despite overall prevalence, treatment varies significantly based on provider or institution and no central treatment guidelines exist to direct the management of breast infections. This article provides a summary of the current trends in management of breast infections.

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Introduction: Despite therapeutic advances in hemorrhagic shock, mortality from multiple organ failure remains high. We previously showed that the α1 subunit of AMP-activated protein kinase (AMPK), a crucial regulator of mitochondrial function, exerts a protective role in hemorrhagic shock. Humanin is a mitochondrial peptide with cytoprotective properties against cellular stress.

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Background: Resuscitation with plasma components has been shown to improve endotheliopathy induced by hemorrhagic shock, but the optimal resuscitation strategy to preserve the endothelial glycocalyx has yet to be defined. The aim of this study was to determine if resuscitation with lactated Ringer's (LR), whole blood (WB), packed red blood cells (RBCs), platelet-rich plasma (PRP), platelet poor plasma, balanced RBC:PRP (1:1), or day 14 (d14) RBC would best minimize endothelial damage following shock.

Methods: Male C57BL/6 mice were hemorrhaged to a goal mean arterial pressure of 25 mm Hg for 1 hour.

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Background: Transplant surgery fellowship is physically and emotionally demanding. The objective of this study was to characterize biophysiological stress and sleep patterns among transplant surgery fellows.

Methods: Participating fellows wore a biophysical monitor over a 28-day period and completed biweekly surveys.

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Introduction: The COVID-19 pandemic forced a sudden change from in-person to virtual interviews for the general surgery residency match. General surgery programs and applicants adopted multiple strategies to best mimic in-person recruitment. The purpose of this study was to evaluate applicant opinions of the virtual recruitment format.

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Background: The Bethesda System for Reporting Thyroid Cytopathology was formalized in 2007 to stratify cytologic specimens based on their risk of malignancy. Several studies have reported significant variations between their institutional rate of malignancy compared to the Bethesda System for Reporting Thyroid Cytopathology. The objective of this study was to determine the national rate of malignancy for Bethesda III, Bethesda IV, and Bethesda V thyroid nodules.

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Background: The prevalence of burnout and depression among abdominal transplant surgeons has been well described. However, the incidence of early-career transplant surgeons leaving the field is unknown. The objective of this study was to quantify the incidence of attrition among early-career abdominal transplant surgeons.

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Background: Surgical stabilization of rib fractures (SSRF) is an accepted efficacious treatment modality for patients with severe chest wall injuries. Despite increased adoption of SSRF, surgical learning curves are unknown. We hypothesized intraoperative duration could define individual SSRF learning curves.

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Background: The benefit of a balanced resuscitation in low volume transfusions remains unclear This study is aimed at characterizing blood product ratios in this cohort.

Methods: A retrospective analysis (2017-2019) of the ACS TQIP was performed to identify adult trauma patients who received ≥1 unit of packed red blood cells (pRBCs) 4 and 24 h after admission. Blood products received were used to calculate plasma and platelet ratios.

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Introduction: The utilization of minimally invasive surgery (MIS) for adrenocortical carcinoma (ACC) remains controversial due to concerns regarding the quality of surgical resection and subsequent oncologic risks. Current guidelines recommend open resections for all cases of suspected ACC independent of size; however, there has been increased adoption of MIS for ACC over time. We sought to determine whether the rise in the utilization of MIS is associated with worse survival outcomes for ACC.

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Introduction: Academic rank and metrics such as total publications (pubs) and H-index are indicators to measure academic achievement. This study aims to determine whether there are gender differences in academic productivity or faculty appointments among endocrine surgeons in the United States.

Methods: A database was generated from the American Association of Endocrine Surgeons (AAES) website.

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Background: Donation after circulatory death (DCD) liver transplantation (LT) has become an effective mechanism for expanding the donor pool and decreasing waitlist mortality. However, it is unclear if low-volume DCD centers can achieve comparable outcomes to high-volume centers.

Methods: From 2011 to 2019 utilizing the United Network for Organ Sharing (UNOS) database, liver transplant centers were categorized into tertiles based on their annual volume of DCD LTs.

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Background: The role of systemic therapy for Stage IA pancreatic ductal adenocarcinoma (PDAC) is unclear. The aim of our study was to evaluate the impact of adjuvant chemotherapy (AC) on survival in patients with early stage disease.

Methods: The National Cancer Database was queried from 2006 to 2017 for resected pT1N0M0 (Stage 1A) PDAC.

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Article Synopsis
  • Advances in surgical education research are important but often underrepresented in surgical journals, prompting this study to analyze publication trends in general surgery and subspecialty journals from 2015 to 2019.
  • A total of 10 general surgery and 16 surgical subspecialty journals were reviewed, with publications categorized into seven topics related to surgical education; statistical analysis revealed that general surgery journals had a significantly higher rate of education-related publications compared to subspecialty journals.
  • The overall median proportion of surgical education publications was low at 1.2%, with the highest being 13.9%; however, publication rates did not significantly differ across journals with various impact factors.
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Background: Pretransplant malignancy is associated with decreased patient and graft survival. Current US guidelines recommend a 2- to 5-year, tumor-free waiting period before transplantation. No large studies have examined the specific, modern day risk of pretransplant thyroid malignancy on patient and graft survival after renal transplant.

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The persistent challenges of disparities in healthcare have led to significantly distinct outcomes among patients from different racial, ethnic, and underserved populations. Esophageal Cancer, not unlike other surgical diseases, has seen significant disparities in care. Esophageal cancer is currently the 6th leading cause of death from cancer and the 8th most common cancer in the world.

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Background: In March 2020, the COVID-19 virus global pandemic forced healthcare systems to institute regulations including the cancellation of elective surgical cases, which likely decreased resident operative experience. The objective of this study was to determine whether the COVID-19 pandemic affected operative experiences of US general surgery residents.

Methods: The operative experience of general surgery residents was examined nationally and locally.

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Purpose Of Review: The last 2 years have seen significant developments in virus-positive liver transplantation. This review provides an updated account of the transplantation of hepatitis C virus (HCV), hepatitis B virus (HBV) and HIV-positive livers, with a specific focus on studies published in the last 18 months.

Recent Findings: The advent of highly efficacious direct acting antiviral agents, nucleos(t)ide analogues and a continued organ shortage have led to the well tolerated utilization of HCV, HBV and HIV-positive organs.

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This is a case report of foreign body ingestion in a 55-year-old intellectually disabled man with a history of pica and previous removal of ten plastic gloves from his rectum four months prior to this presentation. The patient presented after ingesting plastic gloves which formed large, rigid esophageal and gastric bezoars that were not amenable to endoscopic removal. An exploratory laparotomy and gastrostomy was performed, and a 10 × 4.

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