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Comparison of Intensive and Conservative NOL®-Guided Analgesia Strategies During Opioid-free Anesthesia (OFANOL)

3 novembre 2026 mis à jour par: Prof Urs Zingg

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

Pas encore de recrutement

Les conditions

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

Interventionnel

Inscription (Estimé)

400

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

18 ans et plus (Adulte, Adulte plus âgé)

Accepte les volontaires sains

Non

Sexes éligibles pour l'étude

Tout

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

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Science basique
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / 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

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

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

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

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 novembre 2026

Achèvement primaire (Estimé)

1 octobre 2027

Achèvement de l'étude (Estimé)

1 octobre 2027

Dates d'inscription aux études

Première soumission

5 octobre 2026

Première soumission répondant aux critères de contrôle qualité

3 novembre 2026

Première publication (Réel)

4 novembre 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

4 novembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

3 novembre 2026

Dernière vérification

1 novembre 2026

Plus d'information

Termes liés à cette étude

Autres numéros d'identification d'étude

  • 2026-01332

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .