Clinical trial NCT05639712: Affective Effects of Pre-surgery Opioids: a Randomized, Doubleblind Placebo-controlled Trial
Official title: Understanding Opioid Use Before and After Surgery in Norway: A Prospective Multicenter Study and Randomized Double-blind Controlled Study
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE4
Conditions: Opioid Use
Affective Symptoms
Lead sponsor: Oslo University Hospital
Sponsor class: OTHER
Collaborators: name: Vestre VikenHF Kongsberg Sykehus
First posted: 2022-12-06
Enrollment: 1000
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: The patient will be randomized to 1 of 10 arms: Placebo (saline 0.9%), morphine 2.5 - 5 - 10 mg, oxycodone 2.5 - 5 -10 mg, or fentanyl 0.025 - 0.05 - 0.1 mg iv.
Primary purpose: OTHER

Brief summary: 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

Detailed description: 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.

Eligibility criteria: 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

Primary outcomes:
measure: Anxious
timeFrame: 8-10 minutes
measure: Relaxed
timeFrame: 8-10 minutes
measure: Pain level
timeFrame: 8-10 minutes
measure: Good
timeFrame: 8-10 minutes
measure: Dizzy
timeFrame: 2-4 minutes
measure: Sedated
timeFrame: 2-4 minutes
measure: Feeling high, Numeric rating scale 0 -10
timeFrame: 2-4 minutes
measure: Euphoric
timeFrame: 2-4 minutes
measure: Drug liking
timeFrame: 2-4 minutes
measure: Drug disliking
timeFrame: 2-4 minutes
Secondary outcomes:
Other outcomes:
measure: Heart rate
timeFrame: 10 min
measure: Heart rate variability
timeFrame: 10 min
Locations:
city: Oslo
country: Norway
facility: Harald Lenz
Study officials:
affiliation: Kongsberg Hospital, Vestre Viken Health Trust Norway
name: Gernot Ernst, MD,PhD
role: PRINCIPAL_INVESTIGATOR
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