- ICH GCP
- Реестр клинических исследований США
- Клиническое испытание 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.
Обзор исследования
Статус
Условия
Подробное описание
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.
Тип исследования
Регистрация (Оцененный)
Фаза
- Непригодный
Контакты и местонахождение
Контакты исследования
- Имя: Rodrigo L Alves, MD, PhD
- Номер телефона: 71 99961-9818
- Электронная почта: rlalves@ufba.br
Учебное резервное копирование контактов
- Имя: João Paulo A de Carvalho
- Номер телефона: 75 98295-3834
- Электронная почта: joaoaureliano@ufba.br
Места учебы
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Estado de Bahia
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Salvador, Estado de Bahia, Бразилия, 40170-110
- Рекрутинг
- Hospital Universitário Professor Edgard Santos, Federal University of Bahia (HUPES-UFBA)
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Контакт:
- João Paulo A Carvalho
- Номер телефона: 75982953834
- Электронная почта: joaoaureliano@ufba.br
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-
Критерии участия
Критерии приемлемости
Возраст, подходящий для обучения
- Взрослый
Принимает здоровых добровольцев
Описание
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.
Учебный план
Как устроено исследование?
Детали дизайна
- Основная цель: Уход
- Распределение: Рандомизированный
- Интервенционная модель: Параллельное назначение
- Маскировка: Тройной
Оружие и интервенции
Группа участников / Армия |
Вмешательство/лечение |
|---|---|
|
Экспериментальный: 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.
|
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.
|
|
Экспериментальный: 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.
|
|
Фальшивый компаратор: 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.
|
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.
|
Что измеряет исследование?
Первичные показатели результатов
Мера результата |
Мера Описание |
Временное ограничение |
|---|---|---|
|
Total postoperative opioid consumption during the first 24 hours after surgery
Временное ограничение: 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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Вторичные показатели результатов
Мера результата |
Мера Описание |
Временное ограничение |
|---|---|---|
|
Postoperative pain intensity (VAS)
Временное ограничение: 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
Временное ограничение: 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)
Временное ограничение: 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
Временное ограничение: 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)
Временное ограничение: 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
Временное ограничение: 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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Соавторы и исследователи
Спонсор
Следователи
- Главный следователь: Rodrigo M Vieira, MD, Botucatu Medical School, São Paulo State University (UNESP)
Даты записи исследования
Изучение основных дат
Начало исследования (Оцененный)
Первичное завершение (Оцененный)
Завершение исследования (Оцененный)
Даты регистрации исследования
Первый отправленный
Впервые представлено, что соответствует критериям контроля качества
Первый опубликованный (Действительный)
Обновления учебных записей
Последнее опубликованное обновление (Действительный)
Последнее отправленное обновление, отвечающее критериям контроля качества
Последняя проверка
Дополнительная информация
Термины, связанные с этим исследованием
Ключевые слова
Дополнительные соответствующие термины MeSH
- Боль
- Неврологические проявления
- Заболевания нервной системы
- Послеоперационные осложнения
- Патологические процессы
- Признаки и симптомы, пищеварительный тракт
- Нейроповеденческие проявления
- Расстройства восприятия
- Рвота
- Тошнота
- Патологические состояния, признаки и симптомы
- Признаки и симптомы
- Боль, Послеоперационный
- Послеоперационная тошнота и рвота
- Агнозия
Другие идентификационные номера исследования
- 96691226.0.0000.0049 (Идентификатор реестра: 8.416.413)
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Информация о лекарствах и устройствах, исследовательские документы
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