Comparison of Intensive and Conservative NOL®-Guided Analgesia Strategies During Opioid-free Anesthesia (OFANOL)
Comparison of Intensive and Conservative NOL®-Guided Analgesia Strategies During Opioid-free Anesthesia for Bariatric Surgery: A Prospective Randomized Controlled Trial
Participants will be randomized to one of two predefined NOL®-guided analgesia strategies during bariatric surgery performed under OFA. In both groups the NOL® index will be continuously monitored intraoperatively and dexmedetomidine will be administered according to the assigned study algorithm based on the NOL® index using lean body weight (LBW) for dosing.
Aperçu de l'étude
Statut
Statut
Les conditions
Les conditions
Intervention / Traitement
Intervention / Traitement
Description détaillée
The study aims to evaluate whether different intraoperative target ranges of the NOL® index during bariatric surgery performed under OFA are associated with differences in postoperative analgesic consumption and postoperative pain control without significant differences in intraoperative hemodynamics. Based on the physiological mechanisms outlined above, we hypothesize that during OFA with alpha-2 agonists such as dexmedetomidine, intensified NOL® target ranges (potentially 0-10) may be appropriate compared to the established range of 10-25 for opioid based TIVA. If this hypothesis is confirmed, clinical implications would include the need to establish OFA-specific NOL® target ranges to avoid under-treatment of nociception when applying TIVA-derived thresholds to OFA patients. Conversely, using inappropriately high NOL® targets derived from opioid-based anesthesia might lead to inadequate pain control and to excessive administration of analgesics postoperatively.
Type d'étude
Type d'étude
Inscription (Estimé)
Inscription
Phase
Phase
- N'est pas applicable
Contacts et emplacements
Coordonnées de l'étude
Coordonnées de l'étude
- Nom: Isabel Marcolino, Dr. med.
- Numéro de téléphone: +41 44 733 2891
- E-mail: isabel.marcolino@spital-limmattal.ch
Sauvegarde des contacts de l'étude
- Nom: Cornelia Stress, MSc
- Numéro de téléphone: +41 44 736 85 76
- E-mail: Cornelia.stress@spital-limmattal.ch
Critères de participation
Critère d'éligibilité
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
La description
Inclusion Criteria:
- Signed informed consent
- Age ≥ 18 years
- bariatric surgery (sleeve/bypass/Re-Do)
Exclusion Criteria:
- Patients with contraindications for dexmedetomidine or lidocaine
- Lack of ability to follow the study procedure, e.g. due to severe language barriers, mental disorders, dementia - Patients requiring preoperative or postoperative treatment in the intensive care unit (ICU) (excluding Obstructive sleep apnea syndrome (OSAS))
- Patients with conditions precluding the use of the NOL® sensor, such as neuromuscular deficits affecting hand function
- BMI <25 kg/m2
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: Science basique
- Répartition: Randomisé
- Modèle interventionnel: Affectation parallèle
- Masquage: Aucun (étiquette ouverte)
Nombre de bras
Armes et Interventions
Groupe de participants / BrasGroupe de participants / Bras |
Intervention / TraitementIntervention / Traitement |
|---|---|
|
Comparateur actif: Intensive NOL®-guided strategy
Induction: An initial dexmedetomidine bolus of 0.3ug/kg LBW will be administered, followed by a continuous infusion of 0.3 ug/kg LBW/h. |
Induction: An initial dexmedetomidine bolus of 0.3ug/kg LBW will be administered, followed by a continuous infusion of 0.3 ug/kg LBW/h. |
|
Expérimental: Conservative NOL®-guided strategy
Induction: An initial dexmedetomidine bolus of 0.3ug/kg LBW will be administered, followed by a continuous infusion of 0.1 ug/kg LBW/h. |
Induction: An initial dexmedetomidine bolus of 0.3ug/kg LBW will be administered, followed by a continuous infusion of 0.1 ug/kg LBW/h. |
Que mesure l'étude ?
Principaux critères de jugement
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Postoperative pain intensity Measured by the numeric rating scale (NRS) in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
To evaluate whether an intensive NOL®-guided analgesia strategy reduces postoperative pain intensity in the post-anesthesia care unit (PACU) compared to a conservative NOL®-guided analgesia strategy in patients undergoing bariatric surgery under OFA. |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
Postoperative pain intensity Measured by the Behavioral Pain Scale (BPS) in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
To evaluate whether an intensive NOL®-guided analgesia strategy reduces postoperative pain intensity in the post-anesthesia care unit (PACU) compared to a conservative NOL®-guided analgesia strategy in patients undergoing bariatric surgery under OFA. |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Mesures de résultats secondaires
Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Difference between postoperative pain intensity measurement using the Behavioral Pain Scale (BPS) (outcome 1) and numeric rating scale (NRS) (outcome 2) in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Difference between the outcome 1 and outcome 2 |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
Total opioid consumption in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Morphin (mg), Oxynorm (mg), Oxycodon/Naloxon (mg) |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
- Total non-opioid analgesic consumption in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Paracetamol (mg), Metamizol (mg), Ketamin (mg) |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
- Total non-opioid analgesic consumption in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Lidocain-P (mg/kgLBW/h) |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
- Total non-opioid analgesic consumption in the Post-anesthesia care unit (PACU)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Ketamin-Perfusor (mg/h) |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
- Incidence of Postoperative nausea and vomiting (PONV)
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
The proportion of patients who experience at least one episode of postoperative nausea, retching, or vomiting, or who require the administration of any antiemetic rescue medication (such as Ondansetron, Metoclopramide, Domperidone, or Itinerol). |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
- Richmond Agitation-Sedation Scale (RASS) scores during Post-anesthesia care unit (PACU) stay
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
|
|
- Quality of Recovery-15 (QoR-15) score on postoperative day 1
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Autres mesures de résultats
Autres mesures de résultats
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Safety endpoints
Délai: At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
- measures of intraoperative hemodynamic stability, including the incidence of hypotension, bradycardia, hypertension, tachycardia, and vasoactive medication use - occurrence of AEs and SAEs during the study period |
At the Date of Surgery + 1 day after at Post-anesthesia care unit (PACU): two assessments within 2 consequent days
|
Collaborateurs et enquêteurs
Parrainer
Parrainer
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Estimé)
Début de l'étude
Achèvement primaire (Estimé)
Achèvement primaire
Achèvement de l'étude (Estimé)
Achèvement de l'étude
Dates d'inscription aux études
Première soumission
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Première publication
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour publiée
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Dernière vérification
Plus d'information
Termes liés à cette étude
Mots clés
Autres numéros d'identification d'étude
Autres numéros d'identification d'étude
- 2026-01332
Informations sur les médicaments et les dispositifs, documents d'étude
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