- ICH GCP
- Registr klinických studií v USA
- Klinická studie NCT07633444
Transauricular Vagus Nerve Stimulation Frequencies for Postoperative Pain (TVNS-PAIN)
Effects of Different Frequencies of Transauricular Vagus Nerve Stimulation on Postoperative Pain: A Randomized, Double-Blind, Sham-Controlled Trial With Preoperative and Postoperative Sessions
The goal of this clinical trial is to learn whether different frequencies of transauricular vagus nerve stimulation (tVNS) can reduce postoperative pain and opioid consumption in adults undergoing abdominal or urologic surgery. It will also evaluate the effects of tVNS on recovery quality, autonomic function, and treatment safety. The main questions it aims to answer are:
Does transauricular vagus nerve stimulation reduce postoperative opioid consumption during the first 24 hours after surgery? Do different stimulation frequencies (high-frequency and low-frequency tVNS) produce different effects on postoperative pain and autonomic responses? Is transauricular vagus nerve stimulation safe and well tolerated in surgical patients?
Researchers will compare high-frequency tVNS, low-frequency tVNS, and sham stimulation (inactive stimulation) to determine their effects on postoperative pain and opioid requirements.
Participants will:
Be randomly assigned to receive high-frequency tVNS, low-frequency tVNS, or sham stimulation.
Receive two 30-minute stimulation sessions, one before anesthesia and one after surgery in the post-anesthesia care unit.
Undergo assessments of postoperative pain, opioid consumption, need for rescue analgesics, postoperative nausea and vomiting, heart rate changes, and quality of recovery.
Be monitored for adverse events related to the intervention during the study period.
A total of 174 participants will be enrolled in this single-center, randomized, double-blind, sham-controlled clinical trial.
Přehled studie
Postavení
Detailní popis
Postoperative pain remains a major challenge in perioperative care and is associated with delayed recovery, increased healthcare utilization, and greater opioid consumption. Despite advances in multimodal analgesia, opioid medications continue to play a central role in postoperative pain management and may be associated with adverse effects such as nausea, vomiting, respiratory depression, and prolonged recovery. Therefore, the development of effective non-pharmacological adjunctive strategies is of considerable clinical interest.
Transauricular vagus nerve stimulation (tVNS) is a non-invasive neuromodulation technique that stimulates the auricular branch of the vagus nerve through the external ear. Experimental and clinical studies suggest that vagal stimulation may modulate pain perception through activation of central autonomic pathways, enhancement of descending inhibitory pain mechanisms, and regulation of inflammatory responses. Previous clinical trials have demonstrated promising effects of tVNS on acute and chronic pain conditions, including reductions in postoperative pain scores.
However, the optimal stimulation parameters for perioperative analgesia remain uncertain. In particular, the influence of stimulation frequency on clinical outcomes and autonomic responses has not been adequately investigated. Different stimulation frequencies may activate distinct neural pathways and produce different effects on pain modulation and autonomic regulation.
This study is designed to evaluate the effects of different frequencies of transauricular vagus nerve stimulation applied before and after surgery in adult patients undergoing elective surgical procedures. In addition to assessing postoperative opioid requirements, the study will explore the relationship between autonomic responses and postoperative recovery. The findings may contribute to the optimization of non-pharmacological analgesic strategies and support the incorporation of transauricular vagus nerve stimulation into multimodal perioperative pain management protocols.
Typ studie
Zápis (Odhadovaný)
Fáze
- Nelze použít
Kontakty a umístění
Studijní kontakt
- Jméno: Rodrigo L Alves, MD, PhD
- Telefonní číslo: 71 99961-9818
- E-mail: rlalves@ufba.br
Studijní záloha kontaktů
- Jméno: João Paulo A de Carvalho
- Telefonní číslo: 75 98295-3834
- E-mail: joaoaureliano@ufba.br
Studijní místa
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Estado de Bahia
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Salvador, Estado de Bahia, Brazílie, 40170-110
- Nábor
- Hospital Universitário Professor Edgard Santos, Federal University of Bahia (HUPES-UFBA)
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Kontakt:
- João Paulo A Carvalho
- Telefonní číslo: 75982953834
- E-mail: joaoaureliano@ufba.br
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-
Kritéria účasti
Kritéria způsobilosti
Věk způsobilý ke studiu
- Dospělý
Přijímá zdravé dobrovolníky
Popis
Inclusion Criteria:
- Adults aged 18 to 59 years.
- Undergoing elective abdominal or urologic surgery.
- American Society of Anesthesiologists (ASA) physical status I-III.
- Able and willing to provide written informed consent.
Exclusion Criteria:
- History of neurological disorders.
- History of psychiatric disorders.
- Inability to understand study procedures.
- Pregnancy.
- Cognitive impairment.
- Communication difficulties that interfere with study assessments.
- Auricular dermatitis or skin lesions at the stimulation site.
- Pre-existing cardiac arrhythmia.
- Chronic opioid use.
- Implanted electronic medical devices, including pacemakers.
Studijní plán
Jak je studie koncipována?
Detaily designu
- Primární účel: Léčba
- Přidělení: Randomizované
- Intervenční model: Paralelní přiřazení
- Maskování: Trojnásobný
Zbraně a zásahy
Skupina účastníků / Arm |
Intervence / Léčba |
|---|---|
|
Experimentální: High-Frequency tVNS
Participants will receive active transauricular vagus nerve stimulation (tVNS) at a frequency of 60-120 Hz.
Stimulation will be applied bilaterally to the auricular branch of the vagus nerve for 30 minutes before anesthesia and for 30 minutes after surgery.
Current intensity will be adjusted between 2 and 6 mA according to participant tolerance.
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Non-invasive electrical stimulation of the auricular branch of the vagus nerve applied bilaterally through ear electrodes.
Stimulation is delivered before anesthesia and after surgery using predefined frequency settings.
|
|
Experimentální: Low-Frequency tVNS
Participants will receive active transauricular vagus nerve stimulation (tVNS) at a frequency of 10-20 Hz.
Stimulation will be applied bilaterally to the auricular branch of the vagus nerve for 30 minutes before anesthesia and for 30 minutes after surgery.
Current intensity will be adjusted between 2 and 6 mA according to participant tolerance.
|
Non-invasive electrical stimulation of the auricular branch of the vagus nerve applied bilaterally through ear electrodes.
Stimulation is delivered before anesthesia and after surgery using predefined frequency settings.
|
|
Falešný srovnávač: Sham tVNS
Participants will receive sham transauricular vagus nerve stimulation.
The device will be positioned and activated to mimic active treatment, but stimulation will be discontinued shortly after initiation.
Participants will undergo two 30-minute sessions, one before anesthesia and one after surgery, while maintaining blinding to treatment allocation.
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Sham stimulation delivered using the same device and electrode placement as active stimulation.
The device is activated to mimic treatment but does not deliver therapeutic electrical stimulation.
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Co je měření studie?
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
|---|---|---|
|
Total postoperative opioid consumption during the first 24 hours after surgery
Časové okno: 24 hours after surgery
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Total opioid consumption during the first 24 postoperative hours, recorded according to the institutional postoperative analgesia protocol.
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24 hours after surgery
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Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
|---|---|---|
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Postoperative pain intensity (VAS)
Časové okno: Before stimulation in the post-anesthesia care unit, immediately after stimulation, 2 hours after surgery, and 24 hours after surgery
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Pain intensity measured using a 100-mm Visual Analog Scale (VAS).
Pain scores will be assessed at predefined postoperative time points and compared among study groups.
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Before stimulation in the post-anesthesia care unit, immediately after stimulation, 2 hours after surgery, and 24 hours after surgery
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Rescue analgesic use
Časové okno: Within 24 hours after surgery
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Number of participants requiring rescue analgesics and total rescue analgesic administration during the first 24 postoperative hours.
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Within 24 hours after surgery
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Postoperative nausea and vomiting (PONV)
Časové okno: Within 24 hours after surgery
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Incidence of postoperative nausea and/or vomiting and use of rescue antiemetic medication during the postoperative period.
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Within 24 hours after surgery
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Heart rate changes
Časové okno: Immediately before and immediately after each stimulation session (preoperative and postoperative).
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Changes in heart rate measured immediately before and immediately after transauricular vagus nerve stimulation sessions as an indicator of autonomic nervous system activity.
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Immediately before and immediately after each stimulation session (preoperative and postoperative).
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Quality of Recovery (QoR-15 Score)
Časové okno: Baseline (preoperative) and 24 hours after surgery.
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Quality of postoperative recovery assessed using the 15-item Quality of Recovery questionnaire (QoR-15).
Higher scores indicate better recovery.
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Baseline (preoperative) and 24 hours after surgery.
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Adverse events related to transauricular Vagus Nerve Stimulation
Časové okno: From the first stimulation session until 24 hours after surgery.
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Incidence of adverse events potentially related to the intervention, including auricular discomfort, skin irritation, headache, bradycardia, hypotension, bronchospasm, or other treatment-related events.
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From the first stimulation session until 24 hours after surgery.
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Spolupracovníci a vyšetřovatelé
Sponzor
Spolupracovníci
Vyšetřovatelé
- Vrchní vyšetřovatel: Rodrigo M Vieira, MD, Botucatu Medical School, São Paulo State University (UNESP)
Termíny studijních záznamů
Hlavní termíny studia
Začátek studia (Odhadovaný)
Primární dokončení (Odhadovaný)
Dokončení studie (Odhadovaný)
Termíny zápisu do studia
První předloženo
První předloženo, které splnilo kritéria kontroly kvality
První zveřejněno (Aktuální)
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Naposledy ověřeno
Více informací
Termíny související s touto studií
Klíčová slova
Další relevantní podmínky MeSH
- Bolest
- Neurologické projevy
- Nemoci nervového systému
- Pooperační komplikace
- Patologické procesy
- Příznaky a symptomy, zažívací
- Neurobehaviorální projevy
- Poruchy vnímání
- Zvracení
- Nevolnost
- Patologické stavy, příznaky a symptomy
- Příznaky a symptomy
- Bolest, pooperační
- Pooperační nevolnost a zvracení
- Agnosia
Další identifikační čísla studie
- 96691226.0.0000.0049 (Identifikátor registru: 8.416.413)
Plán pro data jednotlivých účastníků (IPD)
Plánujete sdílet data jednotlivých účastníků (IPD)?
Popis plánu IPD
Časový rámec sdílení IPD
Kritéria přístupu pro sdílení IPD
Informace o lécích a zařízeních, studijní dokumenty
Studuje lékový produkt regulovaný americkým FDA
Studuje produkt zařízení regulovaný americkým úřadem FDA
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