Publications by authors named "Korthuis P"

Background: There is great interest in intensive primary care interventions to address high utilization among medically and socially complex patients. How patients experience these interventions has received less attention.

Objective: To better understand patients' experience of intensive primary care, we interviewed patients receiving care from the Streamlined Unified Meaningfully Managed Interdisciplinary Team (SUMMIT), an ambulatory intensive care intervention at an urban federally qualified health center.

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Article Synopsis
  • The study is focused on the increasing issue of hospitalizations related to opioid use disorder (OUD), comparing standard addiction consultation services to a specific treatment involving a long-lasting buprenorphine injection to improve post-hospital care engagement.
  • Patients in six U.S. hospitals who were not on medication for OUD before admission will be randomly assigned either to continue usual care or receive a single dose of a 28-day extended-release buprenorphine upon discharge.
  • Outcomes will be assessed at multiple follow-up points, with the primary goal of seeing if the XR-BUP group shows higher engagement in ongoing treatment 34 days after leaving the hospital, while also monitoring for safety and various secondary effects.
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  • In recent rural U.S. studies, individuals who use drugs (PWUD) are increasingly combining opioids with stimulants like methamphetamine and cocaine.
  • Among 2,705 PWUD surveyed, 74% reported using both opioids and stimulants, with 76% having undergone hepatitis C virus (HCV) testing.
  • Those who used opioids alone had lower rates of HCV testing, and those using both opioids and stimulants were less likely to have received anti-HCV medication compared to those using other drugs.
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Background: Hepatitis C virus (HCV) elimination requires treating people who use drugs (PWUD), yet fewer than 10% of PWUD in the United States access HCV treatment and access is especially limited in rural communities.

Methods: We randomized PWUD with HCV viremia and past 90-day injection drug or non-prescribed opioid use in seven rural Oregon counties to peer-assisted telemedicine HCV treatment (TeleHCV) versus peer-assisted referral to local providers (enhanced usual care; EUC). Peers supported screening and pre-treatment laboratory evaluation for all participants and facilitated telemedicine visits, medication delivery, and adherence for TeleHCV participants.

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Background: Over the last two decades, houselessness and drug-related epidemics both have expanded from urban to rural regions across the United States (US). However, our understanding of the relationship between rural houselessness, drug use, and drug-related harms has not kept pace. The current study addresses this gap by describing houselessness among a large cohort of people who use drugs (PWUD) from rural communities across 10 states.

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  • Previous studies showed limited evidence on how buprenorphine versus methadone affects different groups of people using opioids, particularly with the rise of fentanyl use.
  • The study aimed to compare the risks of treatment discontinuation and mortality between individuals using buprenorphine/naloxone versus those using methadone for opioid use disorder in British Columbia from 2010 to 2020.
  • Findings revealed that users of buprenorphine/naloxone had a significantly higher likelihood of discontinuing treatment after 24 months compared to those on methadone, with 88.8% versus 81.5% discontinuing, indicating that methadone may be more effective in retaining users.
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Hepatitis C (HCV) treatment for people who use drugs (PWUD) decreases injection drug use and injection equipment sharing. We examined changes in injection drug use and injection equipment sharing following HCV treatment in a randomized trial comparing peer-assisted telemedicine for HCV treatment (TeleHCV) versus peer-assisted usual care in rural PWUD. We hypothesize that TeleHCV reduces risky behaviors and peers facilitate this change.

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Emerging legal frameworks in Oregon and Colorado license facilitators to support adults receiving psychedelic services. The current legal frameworks are silent regarding facilitators' personal experience with psychedelics. An e-Delphi process recruited 36 experts with at least 5 years' experience facilitating psilocybin experiences in ceremonial settings, indigenous practices, or clinical trials.

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Introduction: The opioid crisis and the hepatitis C virus epidemic perpetuate and potentiate each other in a syndemic with escalating morbidity. Policy-driven funding can help resolve the syndemic through collaborative solutions that rapidly translate evidence-based interventions into real-world applications.

Methods: We report development and programmatic evaluation of Peer-Assisted Telemedicine for Hepatitis C (PATHS), which utilizes State Opioid Response (SOR) funding to scale-up a positive randomized trial of peer-assisted telemedicine HCV treatment.

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Introduction: At the beginning of the COVID-19 pandemic, federal agencies permitted telehealth initiation of buprenorphine treatment for opioid use disorder (OUD) without in-person assessment. It remains unclear how telehealth-only buprenorphine treatment impacts time to discontinuation and patient reported treatment outcomes.

Methods: A longitudinal observational cohort study conducted September 2021 through March, 2023 enrolled participants with OUD initiating buprenorphine (≤ 45 days) with internet and phone access in Oregon and Washington.

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Background: The United States' (US) opioid overdose epidemic has evolved into a combined stimulant/opioid epidemic, a pattern driven in part by mitigating opioid overdose risk, variable substance availability, and personal preferences. This study aimed to investigate the association between self-reported substance preference (heroin or methamphetamine) and behavioral/health outcomes among individuals who used both heroin and methamphetamine in the rural US.

Methods: The Rural Opioid Initiative is a consortium of 8 research cohorts from 10 states and 65 rural counties that recruited individuals reporting past 30-day injection of any substance or opioid substance use by any route from 1/2018 to 3/2020.

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Background: Medications for opioid use disorder (MOUD) including buprenorphine are effective, but underutilized. Rural patients experience pronounced disparities in access. To reach rural patients, the US Department of Veterans Affairs (VA) has sought to expand buprenorphine prescribing beyond specialty settings and into primary care.

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Objective: To describe a learning health care system research process designed to increase buprenorphine prescribing for the treatment of opioid use disorder (OUD) in rural primary care settings within U.S. Department of Veterans Affairs (VA) treatment facilities.

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Background: Patients with opioid use disorder (OUD) experience various forms of stigma at the individual, public, and structural levels that can affect how they access and engage with healthcare, particularly with medications for OUD treatment. Telehealth is a relatively new form of care delivery for OUD treatment. As reducing stigma surrounding OUD treatment is critical to address ongoing gaps in care, the aim of this study was to explore how telehealth impacts patient experiences of stigma.

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Article Synopsis
  • Voter initiatives in Oregon and Colorado allow for psilocybin services but lack safety and outcome monitoring systems.
  • A study aimed to create best practice measures for these services, involving 36 experts in the psilocybin field through a multi-phase e-Delphi process.
  • The experts identified and prioritized 11 process measures, 11 outcome measures, and 17 structure measures that could help ensure safety, quality, and effectiveness in psilocybin service delivery.
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  • Efforts to distribute naloxone are improving overdose reversal abilities, yet individuals using drugs in rural areas are often hesitant to call 911 due to fears of legal repercussions and stigma.
  • The Rural Opioid Initiative involves eight studies in various rural US communities, analyzing how contextual factors impact drug use and health behaviors through qualitative interviews with drug users.
  • Findings reveal that many respondents prefer non-evidence-based methods for reversing overdoses, emphasizing the need for better education on effective strategies and addressing concerns about law enforcement to encourage seeking emergency help.
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The American Society of Addiction Medicine (ASAM) has published clinical practice guidelines (CPGs) since 2015. As ASAM's CPG work continues to develop, it maintains an organizational priority to establish rigorous standards for the trustworthy production of these important documents. In keeping with ASAM's mission to define and promote evidence-based best practices in addiction prevention, treatment, and recovery, ASAM has rigorously updated its CPG methodology to be in line with evolving international standards.

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Introduction: Opioid agonist treatment (OAT) tapering involves a gradual reduction in daily medication dose to ultimately reach a state of opioid abstinence. Due to the high risk of relapse and overdose after tapering, this practice is not recommended by clinical guidelines, however, clients may still request to taper off medication. The ideal time to initiate an OAT taper is not known.

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  • Accurate estimates of drug use and related health issues among marginalized populations, especially persons who use drugs (PWUD) in rural areas, are essential for effective intervention and understanding health disparities.* -
  • The study used respondent-driven sampling (RDS) to recruit PWUD and evaluated the assumptions behind RDS to ensure the reliability of its prevalence estimates, analyzing various drug usage variables and health indicators among participants.* -
  • Findings indicated a median participant age of 34, with opioids being the most commonly used drug; however, recruitment chains often lacked sufficient length for reliable sample representation, and different weighting methods showed minimal differences in prevalence estimates.*
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Introduction: Despite Medicaid's outsized role in delivering and financing medications for opioid use disorder (MOUD), little is known about the extent to which buprenorphine prescriber networks vary across Medicaid health plans, and whether network characteristics affect quality of treatment received. In this observational cross-sectional study, we used 2018-2019 Medicaid claims in Oregon to assess network variation in the numbers and types of buprenorphine prescribers, as well as the association of prescriber and network characteristics with quality of care.

Methods: We describe prescribers (MD/DOs and advanced practice providers) of OUD-approved buprenorphine formulations to patients with an OUD diagnosis, across networks.

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Background: Hospitalizations involving opioid use disorder (OUD) are increasing. Medications for opioid use disorder (MOUD) reduce mortality and acute care utilization. Hospitalization is a reachable moment for initiating MOUD and arranging for ongoing MOUD engagement following hospital discharge.

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