Publications by authors named "George N Ioannou"

This guideline presents a comprehensive approach to perioperative risk assessment and management in patients with cirrhosis. Recognizing the unique surgical risks in this population, the guideline emphasizes a multidisciplinary approach to preoperative evaluation, perioperative care, and postoperative follow-up. Key considerations include the severity of liver disease, nonhepatic comorbidities, and surgery-specific factors, with an emphasis on the use of validated cirrhosis-specific risk calculators, such as the VOCAL-Penn Score, for individualized risk stratification.

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HCC surveillance is recommended by liver professional societies but lacks broad acceptance by several primary care and cancer societies due to limitations in the existing data. We convened a diverse multidisciplinary group of cancer screening experts to evaluate current and future paradigms of HCC prevention and early detection using a rigorous Delphi panel approach. The experts had high agreement on 21 statements about primary prevention, HCC surveillance benefits, HCC surveillance harms, and the evaluation of emerging surveillance modalities.

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Background: Climate change has led to an increase in wildfires, a major source of air pollution, which may be particularly harmful to individuals diagnosed with cancer. The objective of this study was to examine the relationships of air pollution and wildfires with mortality risk among cancer survivors.

Methods: Surveillance, Epidemiology, and End Results (SEER) cancer registries provided information on 7,051,014 patients diagnosed with cancer from 2000 to 2021 in the United States.

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Background And Aims: Modeling hepatocellular carcinoma (HCC) risk in Alaska Native (AN) peoples with chronic hepatitis B virus (HBV) infection is important for risk stratification and surveillance. Existing HCC risk prediction models use baseline characteristics ascertained at the time of HBV diagnosis, rather than predicting HCC risk within 5 years of a relevant time point (such as a clinic visit), and do not include the HBV genotype (GT). We aimed to develop an HCC risk prediction model that addresses these limitations.

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Objective: To evaluate whether Veterans infected with SARS-CoV-2 have an elevated risk for needing mental health emergency care (MHEC) relative to uninfected comparators, as measured by emergency department or urgent care clinic utilization for a mental health diagnosis.

Data Sources/extraction: Data from Veterans Health Administration (VHA), VHA-paid, and Centers for Medicare & Medicaid-paid services were used to identify incident MHEC use within 1 year of infection for Veterans with a SARS-CoV-2 infection and matched comparators.

Study Design: This was a national, retrospective cohort study that leveraged a target trial emulation framework to examine long-term outcomes of SARS-CoV-2 infection among Veterans enrolled in VHA care.

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Background: Surveillance for HCC remains important after hepatitis C cure. Improved sensitivity of screening with alpha-fetoprotein (AFP) by using a parametric empirical Bayes (PEB) algorithm, which incorporates an individual patient's longitudinal AFP measurements, was previously demonstrated in a retrospective analysis of clinical trial data prior to widespread hepatitis C cure.

Methods: We analyzed de-identified data extracted from the medical records of participants in the Alaska Hepatitis C Study, which aims to enroll all Alaska Native persons living in Alaska with a history of hepatitis C.

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Long COVID is a serious chronic illness that can present in many forms and impact daily functioning and quality of life. Without curative treatments, management of long COVID requires coordination and ongoing access to multidisciplinary care. Starting in 2020, the Veterans Health Administration (VHA), established a national network of Long COVID Clinics (LCCs).

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Background: Coronavirus disease 2019 (COVID-19) has been linked to the development of post-COVID-19 conditions (PCCs). We investigated whether severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection increases the risk of selected PCCs or death up to 1 year after infection, separately in the wild-type (WT), Alpha-transition, Delta, and Omicron eras and by vaccination status.

Methods: We used health records of the Veterans Health Administration to emulate a hypothetical target trial of SARS-CoV-2 infection versus no infection.

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Background: Triggering receptor expressed on myeloid cells 2 (TREM2), a transmembrane, lipid-sensing protein expressed by Kupffer cells, is thought to play a role in metabolic dysfunction-associated steatotic liver disease (MASLD) and metabolic dysfunction-associated steatohepatitis (MASH). Plasma levels of the TREM2 cleavage product, soluble TREM2 (sTREM2), are strongly associated with MASLD severity. We investigated the role of TREM2 in MASH pathogenesis and whether sTREM2 acts both as biomarker and mediator of MASH.

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Importance: SARS-CoV-2, influenza, and respiratory syncytial virus (RSV) contribute to many hospitalizations and deaths each year. Understanding relative disease severity can help to inform vaccination guidance.

Objective: To compare disease severity of COVID-19, influenza, and RSV among US veterans.

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Background: New respiratory syncytial virus (RSV) vaccines have been approved in the USA for the prevention of RSV-associated lower respiratory tract disease in adults aged 60 years and older. Information on the real-world effectiveness of these vaccines is needed.

Methods: We used electronic health records in the Veterans Health Administration to emulate a target trial comparing a single dose of a recombinant stabilised prefusion F protein RSV vaccine versus no vaccination among veterans aged 60 years and older.

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During 2023, the Centers for Disease Control and Prevention (CDC) recommended the first respiratory syncytial virus (RSV) immunizations intended for widespread use in the United States to prevent severe RSV illness in infants and older adults. CDC, in collaboration with federal, public health, and academic partners, is conducting evaluations of real-world effectiveness of recommended RSV immunization products in the United States. Similar frameworks for evaluation are being applied to RSV vaccines and nirsevimab, a long-acting preventative monoclonal antibody, to estimate product effectiveness.

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Background And Aims: Recently proposed "Rule-of-Five" criteria define compensated advanced chronic liver disease (cACLD) and clinically significant portal hypertension (CSPH) using liver stiffness (LS) and platelet count. We aimed to validate these criteria by determining whether they are associated with risk of adverse outcomes.

Approach And Results: Patients without prior hepatic decompensation or HCC who underwent LS and platelet measurements (n = 17,076) were categorized as follows: no cACLD (LS: 2.

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Article Synopsis
  • COVID-19 survivors, particularly older adults, experience increased frailty, which can lead to new medical conditions and functional impairments.
  • A study involving over 91,000 older Veterans showed that those who had COVID-19 developed significantly more health deficits in the year following infection compared to uninfected controls.
  • The most common new health issues identified were fatigue, anemia, muscle atrophy, gait abnormalities, and arthritis, indicating long-term health risks associated with COVID-19.
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Introduction: The controlled attenuated parameter (CAP) score derived from vibration-controlled transient elastography (VCTE, i.e., FibroScan) is a well-validated marker of hepatic steatosis.

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Objective: The epidemiology of COVID-19 has substantially changed since its emergence given the availability of effective vaccines, circulation of different viral variants, and re-infections. We aimed to develop models to predict 30-day COVID-19 hospitalization and death in the Omicron era for contemporary clinical and research applications.

Methods: We used comprehensive electronic health records from a national cohort of patients in the Veterans Health Administration (VHA) who tested positive for SARS-CoV-2 between March 1, 2022, and March 31, 2023.

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Introduction: COVID-19 triggers prothrombotic and proinflammatory changes, with thrombotic disease prevalent in up to 30% SARS-CoV-2 infected patients. Early work suggests that aspirin could prevent COVID-19 related thromboembolic disorders in some studies but not others. This study leverages data from the largest integrated healthcare system in the United States to better understand this association.

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Article Synopsis
  • A study investigates whether COVID-19 is linked to long-term financial hardships among Veterans, particularly those enrolled in the Veterans Health Administration, finding that many face challenges even 18 months post-infection.
  • The research involved a survey of 194 Veterans with a history of COVID-19 and 194 Veterans without, measuring various financial strains and hardships related to health costs and material needs.
  • Results show that 67% of participants experienced financial hardship, with COVID-19 infected Veterans being at significantly higher risk for severe financial strain compared to their uninfected counterparts.
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Background: Although the burden of alcohol-associated hepatocellular carcinoma (HCC) is increasing with rising alcohol consumption, clinical presentation and outcomes of alcohol-associated HCC have not been systematically assessed. We aimed to determine the prevalence, clinical characteristics, surveillance rates, treatment allocation, and outcomes of alcohol-associated HCC.

Methods: Medline and Embase were searched from inception to January 2023.

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Importance: The risk of hepatocellular carcinoma (HCC) declines over time after hepatitis C virus (HCV) cure by direct-acting antiviral (DAA) therapies. Liver society guidelines recommend continuing HCC screening for these patients, but data on screening outcomes are lacking.

Objective: To evaluate the association of HCC screening after HCV cure with overall survival.

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Background: To overcome the limitations of the term "non-alcoholic fatty liver disease" (NAFLD), the term metabolic-associated steatotic liver disease (MASLD) was introduced. While epidemiologic studies have been conducted on MASLD, there is limited evidence on its associated sex and ethnic variations.

Aims: This study assesses the differences across sex and race-ethnicity on the prevalence, associated risk factors and adverse outcomes in individuals with MASLD.

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