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Bewertung der Mikrodosierung von Buprenorphin/Naloxon im Vergleich zur Standarddosierung in Notaufnahmen

21. September 2026 aktualisiert von: Jessica Moe, University of British Columbia

Bewertung der Mikrodosierung in Notaufnahmen: Eine randomisierte kontrollierte Studie zum Vergleich der Wirksamkeit der Buprenorphin/Naloxon-Mikrodosierung mit der Standarddosierung (EMED-Studie)

This is a multi-centre, open-label RCT at four Emergency Departments (EDs) in British Columbia and Alberta. The purpose of the current study is to compare the effectiveness of buprenorphine/naloxone microdosing and standard dosing take-home induction regimens at enabling patients to successfully complete the induction regimen, and at retaining patients on opioid agonist therapy.

We will randomize our enrolled patients to receive take-home microdosing or standard dosing packages of buprenorphine/naloxone. For the microdosing arm, patients immediately start taking low doses that increase to effective levels without requiring them to go into withdrawal.

We hypothesize that ED patients provided buprenorphine/naloxone microdosing packages will be more likely to successfully complete the induction period compare to patients provided standard dosing packages. We furthermore hypothesize that those provided microdosing will be more likely to be retained in opioid agonist therapy, and will experience lower overdose, mortality, and healthcare utilization subsequent to their ED visit.

Studienübersicht

Status

Rekrutierung

Bedingungen

Intervention / Behandlung

Detaillierte Beschreibung

This multi-centered, open-label RCT will be carried out at four emergency departments (EDs) across Canada, two in British Columbia (Vancouver General Hospital and St. Paul's Hospital) and two in Alberta (Royal Alexandra Hospital and Northeast Health Centre). The investigators will randomize the selected patients to receive take-home microdosing or standard dosing packages. These will include a five-day regimen in a bubble package, along with over-the-counter adjunctive medication. The details of the different regimens are outlined in the "Study Arms" section of this page, and the adjunctive medication regimen is highlighted below.

The primary objective of the current study is to compare the effectiveness of ED-initiated buprenorphine/naloxone take-home standard dosing and microdosing interventions for patients with opioid use disorder identified at the four study ED's, with regard to a) successful completion of the induction period (primary outcome) and b) retention on opioid agonist therapy at 30, 90, and 365 days following ED visit, or decreasing overdose, mortality and healthcare utilization (secondary outcomes).

The primary outcome measure will be whether the patient filled a prescription for buprenorphine/naloxone within two weeks of their ED visit (binary variable). If this occurs, the investigators presume that the patient successfully completed the induction regimen provided, followed up with a healthcare provider able to prescribe buprenorphine/naloxone, and was subsequently prescribed ongoing buprenorphine/naloxone therapy. The investigators chose a two-week period, recognizing that patients receiving take-home packages from the ED may not start taking the induction regimen immediately after the ED visit, but instead may decide to delay the start of their regimen to a time that is more convenient to them. The investigators hypothesize that most patients would decide to start within two weeks of their ED visit. This hypothesis is supported by peer advisors on the study team.

Secondary outcomes will include retention on OAT, which will be assessed using provincial pharmacy records (PharmaNet and PIN) up to 30, 90 and 365 days.

The investigators will also examine fatal or non-fatal overdose, mortality, ED visits, physician visits, admissions, and days admitted within 30, 90 and 365 days (timeframes plausibly attributable to ED interventions). The investigators expect that successful OAT initiation would lead to decreased healthcare use, consistent with our previous work indicating high admissions among persons with recent OUD diagnoses and OAT discontinuation. The investigators will also assess patients' self-reported experiences with study regimens, withdrawal, precipitated withdrawal, and comfort via participant surveys.

The study will offer co-interventions to both the intervention and control groups that will be outlined in study-related pre-printed clinical ordersets. This will include symptomatic treatment of nausea/vomiting (dimenhydrinate: 50 mg PO q6h prn - 6 doses), and pain or myalgias (acetaminophen: 975 mg po q6h prn - 6 doses) (ibuprofen: 400 mg po q6h prn - 6 doses), to use in the first two days of inductions, when the investigators expect withdrawal symptoms to be most challenging, especially for standard dosing. Those receiving microdosing may experience breakthrough withdrawal if they do not take an adequate dose of overlapping opioid. Of note, enrolled patients will also be offered counselling with ED social workers to aid with social or other patient needs (e.g., housing, transportation).

This RCT builds on interventions, recruitment, and follow-up procedures successfully tested in a feasibility study. The study team has expertise in emergency and addictions medicine, peer engagement, community overdose prevention, biostatistics, health economics, and RCT implementation, including the high-profile SALOME trial comparing heroin and hydromorphone treatments in our target population. Knowledge users from provincial health ministry and regions will ensure scale-up. The study team are engaging people with lived experience throughout study design, implementation, and interpretation to ensure relevance.

The investigators will ascertain our primary and secondary outcome measures relating to completion of induction and retention on OAT, on records of prescriptions filled in provincial pharmacy databases: PharmaNet in BC, and the Pharmaceutical Information Network in Alberta. The investigators specifically selected partner sites in BC and Alberta to allow our team to access these provincial administrative databases for outcome ascertainment, which will minimize losses to follow-up and strengthen the reliability of our results. The investigators will assess secondary outcomes of overdose and mortality by linking our study cohort to the BC Centre for Disease Control Overdose Cohort (for patients enrolled in BC), and to provincial Vital Statistics data (Alberta and BC). The investigators will assess secondary outcomes related to healthcare utilization by linking our study cohort to provincial databases on emergency department visits (National Ambulatory Care Reporting System) and hospitalizations (Discharge Abstract Data) in Alberta and BC. We will access all administrative databases through Population Data BC (PopData BC) and Alberta Health Services.

This trial will inform urgent development of effective ED buprenorphine/naloxone programs to improve OAT access for people at high risk of overdose. The investigators will leverage our networks of policy makers, public health leaders, and health providers to enable rapid dissemination of findings in guidelines and policies across Canada.

Studientyp

Interventionell

Einschreibung (Geschätzt)

658

Phase

  • Phase 2
  • Phase 3

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studieren Sie die Kontaktsicherung

Studienorte

    • Alberta
      • Calgary, Alberta, Kanada, T2N2T9
      • Edmonton, Alberta, Kanada, T5H 3V9
        • Noch keine Rekrutierung
        • Royal Alexandra Hospital
        • Kontakt:
      • Edmonton, Alberta, Kanada, T5A 5E4
    • British Columbia
      • Vancouver, British Columbia, Kanada, V6Z 1Y6
      • Vancouver, British Columbia, Kanada, V5Z 1M9
        • Rekrutierung
        • Vancouver General Hospital
        • Kontakt:
        • Hauptermittler:
          • Jessica Moe, MD
      • Vancouver, British Columbia, Kanada, V6T2B5
        • Rekrutierung
        • University of British Columbia Hospital
        • Hauptermittler:
          • Jessica Moe, MD
        • Kontakt:

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

18 Jahre und älter (Erwachsene, Älterer Erwachsener)

Akzeptiert gesunde Freiwillige

Nein

Studienberechtigte Geschlechter

Alle

Beschreibung

Inclusion Criteria:

We will include ED patients ≥18 years of age with opioid use disorder who are being discharged from the ED. We will define opioid use disorder as non-medical opioid use in the previous 30 days and a positive score for opioid dependency based on the validated Rapid Opioid Dependence Screen (RODS).

All patients will also be assessed by the treating physician or degree of clinical opioid withdrawal, based on the clinical opiate withdrawal scale (COWS) score. Patients will be eligible for the take-home study interventions if they have a COWS score <=12, as a score greater than 12 would mean the patient is a candidate for standard buprenorphine induction in the ED at that moment in time, and would therefore not be eligible for outpatient study interventions.

Exclusion Criteria:

  • Active withdrawal at time of ED assessment (Clinical Opiate Withdrawal Score [COWS] >12)
  • Admitted to hospital
  • Severe communication barriers that inhibit patients' understanding of study procedures and interventions
  • Are taking opioids for cancer or palliative-care related indications
  • Are deemed unsafe to approach by ED providers
  • Incarceration
  • Not a resident of the province in which they are seeking care (BC or Alberta)
  • Actively receiving OAT, defined as having filled a prescription for one of the following medications in the 5 days prior to ED presentation: buprenorphine/naloxone, methadone, sustained release morphine, injectable hydromorphone, injectable diacetylmorphine
  • Prior enrollment in the study
  • Known or suspected mechanical gastrointestinal obstruction (e.g., bowel obstruction or strictures) or any diseases/conditions that affect bowel transit (e.g., ileus of any type).
  • Suspected surgical abdomen (e.g., acute appendicitis or pancreatitis).
  • Severe respiratory insufficiency.
  • Severe CNS depression, increased cerebrospinal or intracranial pressure, and head injury.
  • Complicating patient factors that make home inductions from the ED unsafe and/or that require expert consultation for consideration of induction in an observed setting.

These factors include:

  • Allergy to buprenorphine/naloxone
  • Severe respiratory or liver dysfunction
  • Concurrent withdrawal or intoxication from sedatives (e.g., alcohol, benzodiazepines)
  • Active prescription for sedative medications (e.g., benzodiazepines, opioids)
  • Use of monoamine oxidase inhibitors within the past 14 days
  • Concerns that the patient is unable to safely store medications
  • Pregnancy (we will obtain a point-of-care urine pregnancy test on all women of child-bearing age prior to enrollment)

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Hauptzweck: Behandlung
  • Zuteilung: Zufällig
  • Interventionsmodell: Parallele Zuordnung
  • Maskierung: Single

Waffen und Interventionen

Teilnehmergruppe / Arm
Intervention / Behandlung
Aktiver Komparator: Buprenorphine/naloxone Microdosing

Participants with Opioid use disorder will receive a Buprenorphine/naloxone microdosing package from the ED. This will consist of a five-day take-home packages with gradually increasing doses of 2mg/0.5mg buprenorphine/naloxone tablet employing a four times daily dosing schedule over five days.

Day 1: Buprenorphine 0.5 mg-naloxone 0.125 mg SL* QID** (One quarter tablet),

Day 2: Buprenorphine 1 mg-naloxone 0.25 mg SL QID (One half tablet),

Day 3: Buprenorphine 2 mg-naloxone 0.5 mg SL QID (1 tablet),

Day 4: Buprenorphine 3 mg-naloxone 0.75 mg SL QID (1.5 tablets)

Day 5: Buprenorphine 16 mg-naloxone 4 mg SL once daily (8 tablets).

*SL: Sublingual

** QID: four times daily

Buprenorphine/naloxone is a first line, evidence-based opioid agonist therapy that improves mortality for people with opioid use disorder, and that has been demonstrated to be effective at retaining people in addictions care and decreasing illicit opioid use when initiated from EDs.

Andere Namen:
  • Suboxone
Aktiver Komparator: Buprenorphine/naloxone Standard Dosing

The control intervention will be provision of a buprenorphine/naloxone standard dosing package from the ED. This will consist of a five day package with a commonly accepted standard dosing regimen aiming to achieve a therapeutic buprenorphine/naloxone dose within 24 hours of initiation. Standard dosing packages are currently available in EDs in BC and Alberta as standard of care.

Day 1: Buprenorphine 2 mg-naloxone 0.5 mg SL q1h prn to a maximum of 6 tablets in the first 24 hours (1 tablet),

Day 2: Buprenorphine 12 mg-naloxone 3 mg SL once daily (6 tablets),

Day 3: Buprenorphine 16 mg-naloxone 3 mg SL once daily (8 tablets),

Day 4:Buprenorphine 16 mg-naloxone 3 mg SL once daily (8 tablets).

Day 5:Buprenorphine 16 mg-naloxone 3 mg SL once daily (8 tablets).

Buprenorphine/naloxone is a first line, evidence-based opioid agonist therapy that improves mortality for people with opioid use disorder, and that has been demonstrated to be effective at retaining people in addictions care and decreasing illicit opioid use when initiated from EDs.

Andere Namen:
  • Suboxone

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Number of patients who have filled a prescription for buprenorphine/naloxone within two weeks of their ED visit.
Zeitfenster: 14 days

Number of patients who have filled a prescription for buprenorphine/naloxone within two weeks of their ED visit.

14 days

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Number of patients retained in Opioid agonist therapy (OAT) following the ED visit
Zeitfenster: 30, 90, and 365 days

Number of patients retained in Opioid agonist therapy (OAT) following the ED visit

30, 90, and 365 days
Number of fatal or non-fatal overdose events, mortality, ED visits, physician visits, admissions, and days admitted to hospital for patients following ED visit.
Zeitfenster: 30, 90, and 365 days.

Number of fatal or non-fatal overdose events, mortality, ED visits, physician visits, admissions, and days admitted to hospital for patients following ED visit.

30, 90, and 365 days.

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Ermittler

  • Hauptermittler: Jessica Moe, MD, University of British Columbia

Publikationen und hilfreiche Links

Die Bereitstellung dieser Publikationen erfolgt freiwillig durch die für die Eingabe von Informationen über die Studie verantwortliche Person. Diese können sich auf alles beziehen, was mit dem Studium zu tun hat.

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

23. Juli 2021

Primärer Abschluss (Geschätzt)

1. Dezember 2027

Studienabschluss (Geschätzt)

1. Juni 2028

Studienanmeldedaten

Zuerst eingereicht

14. Mai 2021

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

14. Mai 2021

Zuerst gepostet (Tatsächlich)

19. Mai 2021

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

24. September 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

21. September 2026

Zuletzt verifiziert

1. September 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • H20-03698

Plan für individuelle Teilnehmerdaten (IPD)

Planen Sie, individuelle Teilnehmerdaten (IPD) zu teilen?

NEIN

Beschreibung des IPD-Plans

There is no plan to make individual participant data available to other researchers

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

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