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Affektive virkninger af opioider før kirurgi: et randomiseret, dobbeltblindt placebokontrolleret forsøg (AFFECT2)

21. september 2026 opdateret af: Harald Lenz, Oslo University Hospital

Forståelse af opioidbrug før og efter operation i Norge: En prospektiv multicenterundersøgelse og randomiseret dobbeltblind kontrolleret undersøgelse

  1. To investigate and compare the affective short-term effects of opioid drugs: morphine, oxycodone and fentanyl, administered to the patients before the induction of general anesthesia.
  2. Charting opioid use after surgery in patients treated at hospitals in Norway
  3. Identify predictors for postoperative opioid use and persistent pain

Studieoversigt

Detaljeret beskrivelse

The aim of the present study is to assess and compare, with a randomized, double-blind placebo-controlled trial, the affective effects of three commonly used opioid analgesics (Morphine, oxycodone and fentanyl) administered in three different doses before surgery in a clinical setting associated with physiological and psychological stress.

As a starting point, we have conducted an observational quality control study on peri-operative opioid pain management in day surgery patients.

Quality control study - a pilot study In this observational quality control study, we measured acute effects of the opioid agonist Remifentanil (effect site concentration 5ng/ml, Minto model) in day surgery patients on the operating table at Kongsberg hospital. Patients rated their levels of "feeling good" and "anxious" on a 0-10 numerical rating scale (NRS) immediately before and 1 minute after receiving remifentanil infusion. They also rated drug-specific effects such as "feeling high", "liking the drug effects" and their "level of drug-related discomfort". Moreover, we collected data on postoperative opioid use and pain during recovery through a telephone interview on the day following the surgery. The study was conducted with the usual standard hospital treatment and as such, did not interfere with the patients' medical procedures. All the procedures were approved by the data protection officer at Kongsberg Hospital, and all included patients signed informed consent on the day of surgery.

In the weeks prior to surgery participants received a questionnaire to assess their pain levels, nervousness and demographics as part of the hospital's standard procedure. On the day of surgery, approximately 30 min before surgery (T2) patients were asked to fill in questionnaires to assess mood, pain and prior opioid use. One minute before and one minute after opioid ( administration (T3), the patient was asked to rate mood, anxiety, drug liking and drug related discomfort. On the day following surgery patients were contacted by phone to assess their mood, pain and pain interference, as well as their pain relief strategies in the last 24h (e.g. use of provided analgesics).

160 patients were included in the pilot quality control study. The results of the pilot study show that patients report a clear feeling of 'drug high' after remifentanil infusion. Surprisingly, however, the opioid analgesic induced only a weak reduction of anxiety, and the majority of patients reported feeling worse or equally good, but not better, after the infusion. In the postoperative phone interview, many patients tell us they have not used any of the opioid drugs prescribed for at-home pain relief during the first 24 hours are recovering at home. Stated reasons include a fear of addiction, as well as a wish to keep the analgesics in case of breakthrough/peak pain at a later stage. These preliminary results do not support the opioid pre-induction procedure as an effective manner to produce pre-surgery stress relief. It might be possible that the subjective perception of stress relief does not match the physiological relief reaction to stress.

On the basis of these intriguing, preliminary findings, we will now conduct a more comprehensive randomized double-blind controlled study comparing different classes of pre-surgical opioid analgesics on the subjective and physiological affective reactions in an acute stress clinical situation in Norway.

Possible participants of the AFFECT2 RCT (randomized controlled trial) will also be asked if they wish to join a parallel longitudinal study conducted in collaboration with the University of Oslo (UiO) in which we will collect and analyse data on relevant pre-surgery risk factors for problematic opioid use, and to quantify opioid-induced analgesia before and after surgery using prescription registry data.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

1014

Fase

  • Fase 4

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Oslo
      • Oslo, Oslo, Norge
        • Harald Lenz

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

- Health status ASA1 (American Society of Anesthesiologists physical status) or ASA2 as categorised by a medical doctor at the hospital based on medical history, physical examination, laboratory test etc. unrelated to the current study.

ASA1 and ASA2 (ASA1 is defined as "Healthy, non-smoking, no or minimal alcohol use" and ASA2 is defined as "Mild diseases only without substantive functional limitations). Being eligible for day surgery means participants are overtly healthy as determined by clinical staff.

  • The participant is considered as eligible for the use of fentanyl, morphine and oxycodone by a medical doctor at the hospital, based on an overall assessment of the psychiatric and somatic condition, used medical drugs, regarding possible interactions and contraindications for the use of the study medicaments.
  • Body weight and body mass index (BMI) within the range 18-35 kg/m2 (inclusive).
  • Capable of giving signed informed consent as which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol.
  • Having good verbal communication skills in Norwegian.
  • Patients undergoing planned day surgery with general anesthesia (outpatient sample).
  • Orthopedic, rectal, gynecological, hand and foot surgery, and minor vascular procedures.
  • Inpatients undergoing planned gynecological and orthopedic surgery.
  • Hysterectomy, laparoscopic ovariectomy, lumbal herniotomy and other related procedures.
  • Minor gastrointestinal surgery

Exclusion Criteria:

  1. Known allergic reactions to morphine, oxycodone,or fentanyl. Known allergic reactions to any of the incredients described in the SPC, pt 6.1.
  2. Severe chronic obstructive lung disease,
  3. Cor pulmonale,
  4. Severe bronchial asthma,
  5. Severe respiratory failure with hypoxemia and hypercapnia
  6. Moderate to severe hepatic impairment,
  7. Moderate to severe kidney failure
  8. Acute abdomen
  9. Increased brain pressure
  10. Head trauma
  11. Use of MAO blockers in the last two weeks
  12. Hypovolemia
  13. Hypotension
  14. Myasthenia gravis
  15. Any other health status not corresponding to ASA1 or ASA2. This includes patients with severe disease burden, major psychiatric disorders that could interfere with the procedures and communication.
  16. Pregnancy. Women of childbearing potential defined as all premenopausal female (a postmenopausal state is defined as no menses for 12 months without an alternative medical cause) will be asked if they are pregnant.
  17. Breastfeeding women.
  18. Illegal drugs use like opioids, cocaine and amphetamine

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Andet
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Dobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Placebo komparator: Placebo

The patient is given standardized questions about their well-being and affective state before and after the administration of placebo (0.9% NaCl intravenously). This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of placebo intravenously. This is carried out on the operating table right before anesthesia

Andre navne:
  • 0,9% NaCl , Natriumklorid 9 mg/ml, Hameln (ATC-kode: B05B B01)
Aktiv komparator: Morphine 2.5 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of morphine 2.5 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of 2.5 mg morphine intravenously. This is carried out on the operating table right before anesthesia

Andre navne:
  • Morfin, Orion (ATC-kode: N02A A01)
Aktiv komparator: Morphine 5 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of morphine 5 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of morphine 5 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Morfin, Orion (ATC-kode: N02A A01)
Aktiv komparator: Morphine 10 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of morphine 10 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of morphine 10 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Morfin, Orion (ATC-kode: N02A A01)
Aktiv komparator: Oxycodone 2.5 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of oxycodone 2.5 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of oxycodone 2.5 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Oxycodon, Hameln (ATC-kode: N02A A05)
Aktiv komparator: Oxycodone 5 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of oxycodone 5 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of oxycodone 5 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Oxycodon, Hameln (ATC-kode: N02A A05)
Aktiv komparator: Oxycodone 10 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of oxycodone 10 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of oxycodone 10 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Oxycodon, Hameln (ATC-kode: N02A A05)
Aktiv komparator: Fentanyl 0.025 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of fentanyl 0.025 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of fentanyl 0.025 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Fentanyl, Hameln (ATC-kode: N01A H01)
Aktiv komparator: Fentanyl 0.05 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of fentanyl 0.05 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of fentanyl 0.05 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Fentanyl, Hameln (ATC-kode: N01A H01)
Aktiv komparator: Fentanyl 0.1 mg

The patient is given standardized questions about their well-being and affective state before and after the administration of fentanyl 0.1 mg intravenously. This is carried out on the operating table right before anesthesia

The patient is given standardized questions about their well-being and affective state before and after the administration of fentanyl 0.1 mg intravenously . This is carried out on the operating table right before anesthesia

Andre navne:
  • Fentanyl, Hameln (ATC-kode: N01A H01)

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Anxious
Tidsramme: 8-10 minutes

Asking the patient of feeling anxious; Numeric rating scale 0 -10 prior opioid and post opioid intravenously (or placebo). 0=not anxious and 10=feeling extremely anxious

8-10 minutes
Relaxed
Tidsramme: 8-10 minutes

Asking the patient of feeling relaxed. Numeric rating scale 0 -10 prior opioid and post opioid intravenously (or placebo). 0=not relaxed and 10=very relaxed.

8-10 minutes
Pain level
Tidsramme: 8-10 minutes

Asking the patient of pain level. Numeric rating scale 0 -10 prior opioid and post opioid intravenously (or placebo). 0=no pain and 10= worst pain imaginable

8-10 minutes
Good
Tidsramme: 8-10 minutes

Asking the patient of feeling good. Numeric rating scale 0 -10 prior opioid and post opioid intravenously (or placebo). 0=feeling no good and 10= feeling very good.

8-10 minutes
Dizzy
Tidsramme: 2-4 minutes

Asking the patient of feeling dizzy. Numeric rating scale 0-10 post opioid intravenously (or placebo). 0=feeling not dizzy and 10=feeling very dizzy.

2-4 minutes
Sedated
Tidsramme: 2-4 minutes

Asking the patient of feeling sedated. Numeric rating scale 0-10 post opioid intravenously (or placebo). 0=feeling not sedated and 10=feeling very sedated.

2-4 minutes
Feeling high, Numeric rating scale 0 -10
Tidsramme: 2-4 minutes

Asking the patient of feeling high. Numeric rating scale 0-10 post opioid intravenously (or placebo). 0=feeling not high and 10=feeling very high.

2-4 minutes
Euphoric
Tidsramme: 2-4 minutes

Asking the patient of feeling high. Numeric rating scale 0-10 post opioid intravenously (or placebo). 0=feeling not euphoric and 10=feeling very euphoric.

2-4 minutes
Drug liking
Tidsramme: 2-4 minutes

Asking the patient of drug liking. Numeric rating scale 0-10 post opioid intravenously (or placebo). 0=feeling not drug liking and 10=feeling very drug liking.

2-4 minutes
Drug disliking
Tidsramme: 2-4 minutes

Asking the patient of drug disliking. Numeric rating scale 0-10 post opioid intravenously (or placebo). 0=feeling not drug disliking and 10=feeling very drug disliking.

2-4 minutes

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Onset time
Tidsramme: Subjective onset time of the three opioids during the 2 minutes observation time before anaesthesia induction

Determine onset time of subjective drug effect of the three opioids (each at three different doses) and proportion of participants that report feeling a drug effect within 0-2 minutes

Subjective onset time of the three opioids during the 2 minutes observation time before anaesthesia induction

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Heart rate
Tidsramme: 10 min

beats/min prior opioid and post opioid intravenously

10 min
Heart rate variability
Tidsramme: 10 min

Heart rate variability (HRV) prior opioid and post opioid intravenously

10 min

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Efterforskere

  • Ledende efterforsker: Gernot Ernst, MD,PhD, Kongsberg Hospital, Vestre Viken Health Trust Norway

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

13. december 2022

Primær færdiggørelse (Faktiske)

27. maj 2025

Studieafslutning (Faktiske)

27. juni 2025

Datoer for studieregistrering

Først indsendt

17. november 2022

Først indsendt, der opfyldte QC-kriterier

28. november 2022

Først opslået (Faktiske)

6. december 2022

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

24. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

21. september 2026

Sidst verificeret

1. september 2026

Mere information

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