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- Ensaio Clínico NCT02097407
Preoperative Dexmedetomidine & EC50 of Propofol (PreopDXM)
Preoperative Dexmedetomidine Reduces the EC50 of Propofol for Successful i-gelTM Insertion Without Muscle Relaxants
Visão geral do estudo
Status
Condições
Intervenção / Tratamento
Descrição detalhada
Propofol is a useful induction agent for LMA insertion without muscle relaxants because it profoundly inhibits pharyngeal and laryngeal reactivity. A previous report showed that the effect-site concentration of propofol for successful classic LMA insertion in 50% of adults (EC50) without muscle relaxants in healthy male patients was 8.72 (0.55) µg ml-1. The EC50 of propofol may be dependent on the type of LMA used. A previous study comparing the EC50 of the propofol concentration between classic and proseal LMA insertions demonstrated that the EC50 of propofol needed for proseal LMA insertion was 35% greater than that needed for classic LMA insertion. Unfortunately, no investigation has been performed to determine the EC50 of the propofol concentration required for i-gel insertion without muscle relaxants.
Dexmedetomidine (DEX), a selective alpha-2 agonist, has sympatholytic, sedative, and analgesic properties. Such beneficial characteristics make DEX a useful anaesthetic adjuvant for general anaesthesia. Many reports have revealed the beneficial effects of DEX in terms of reducing intraoperative anaesthetic requirements, postoperative analgesic demand, and increased haemodynamic responses to noxious stimuli such as endotracheal intubation. A previous investigation showed that preoperative clonidine, an alpha-2 agonist, decreased the EC50 required for LMA insertion.
We hypothesised that preoperative DEX administration can reduce the propofol concentration required for i-gel insertion. In this study, we compared the EC50 of propofol needed for successful i-gel insertion without muscle relaxants between DEX and placebo groups
Tipo de estudo
Inscrição (Real)
Estágio
- Fase 4
Contactos e Locais
Locais de estudo
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Seoul, Republica da Coréia, 110-799
- Seoul National University of Hospital
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Critérios de participação
Critérios de elegibilidade
Idades elegíveis para estudo
Aceita Voluntários Saudáveis
Gêneros Elegíveis para o Estudo
Descrição
Inclusion Criteria:
- ASA physical status I-II patients who were 20-65 years old and scheduled for general anaesthesia for urologic surgery
Exclusion Criteria:
- Patients with an allergy to alpha-2 adrenergic agonists or propofol
- Patients who anticipated difficult airway (cervical spinal disease, Mallampati score of III or IV, a mouth opening of <2.5 cm, and/or body mass index of >30 kg m-2), unstable teeth
- Patients with bradycardia of <50 beats/min, heart block greater than first degree, severe cardiorespiratory dysfunction
- Patients with symptoms of upper respiratory infection
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Finalidade Principal: Cuidados de suporte
- Alocação: Randomizado
- Modelo Intervencional: Atribuição de grupo único
- Mascaramento: Triplo
Armas e Intervenções
Grupo de Participantes / Braço |
Intervenção / Tratamento |
|---|---|
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Experimental: Group D : Dexmedetomidine + propofol group
In Group D, DEX (1 µg kg-1) was intravenously loaded for 10 min before induction of anaesthesia.
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All patients were pre-oxygenated with 100% oxygen with spontaneous breathing for 3 min before the end of loading of dexmedetomidine. Anaesthesia was induced with predetermined effect-site propofol concentrations using a target-controlled infusion device (Orchestra; Fresenius-Vial, Brezins, France). The first patient in Group D received an effect-site propofol concentration of 3 and 5 µg mL-1, respectively, over 5 min. After equilibration of the plasma and effect-site propofol concentrations, i-gel (size 4 for patients weighing 50-90 kg, size 3 for patients weighing 30-50 kg) was inserted using the standard technique by a single anaesthesiologist staff member with expertise in i-gel insertion and who entered the operating room immediately before i-gel insertion to blind him to the group assignment. |
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Comparador de Placebo: Group C : Saline + propofol group
In Group C, 0.9% of normal saline (1 µg kg-1) was loaded 10 min before induction of anaeshtesia.
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All patients were pre-oxygenated with 100% oxygen with spontaneous breathing for 3 min before the end of loading of normal saline. Anaesthesia was induced with predetermined effect-site propofol concentrations using a target-controlled infusion device (Orchestra; Fresenius-Vial, Brezins, France). The first patient in Group C received an effect-site propofol concentration of 3 and 5 µg mL-1, respectively, over 5 min. After equilibration of the plasma and effect-site propofol concentrations, i-gel (size 4 for patients weighing 50-90 kg, size 3 for patients weighing 30-50 kg) was inserted using the standard technique by a single anaesthesiologist staff member with expertise in i-gel insertion and who entered the operating room immediately before i-gel insertion to blind him to the group assignment |
O que o estudo está medindo?
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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EC50 of propofol required for successful i-gel insertion
Prazo: During i-gel insertion anticipated up to 1 min
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The EC50 of propofol for successful i-gel insertion was determined by a modification of Dixon's up-and-down method.
The response of each patient determined the effect-site propofol concentration for the next patient.
If the response was deemed 'successful', the next target concentration of propofol was decreased by 0.5 µg mL-1.
If the response was deemed a 'failure', the target concentration was increased by the same dose.
The process was repeated until the sixth crossover point (success/failure) was obtained.
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During i-gel insertion anticipated up to 1 min
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Medidas de resultados secundários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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the total dose of propofol infused before i-gel insertion
Prazo: During i-gel insertion time anticipated upto 1min
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The total amount of propofol infused before i-gel insertion was noted.
The insertion time, defined as the time from picking up the i-gel until the initiation of mechanical ventilation.
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During i-gel insertion time anticipated upto 1min
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the presence/severity of airway trauma after i-gel insertion
Prazo: At the time point of removing the i-gel from patient's mouth
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After removing the i-gel, airway trauma (defined as any blood staining on the device) was recorded.
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At the time point of removing the i-gel from patient's mouth
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Colaboradores e Investigadores
Patrocinador
Investigadores
- Diretor de estudo: Hee Pyung Park, MD PhD, Professor
- Investigador principal: Young Cheol Kim, Md PhD, Professor
Publicações e links úteis
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo
Conclusão Primária (Real)
Conclusão do estudo (Real)
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Estimativa)
Atualizações de registro de estudo
Última Atualização Postada (Estimativa)
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Mais Informações
Termos relacionados a este estudo
Termos MeSH relevantes adicionais
- Efeitos Fisiológicos das Drogas
- Agentes Adrenérgicos
- Agentes Neurotransmissores
- Mecanismos Moleculares de Ação Farmacológica
- Depressores do Sistema Nervoso Central
- Agentes do Sistema Nervoso Periférico
- Analgésicos
- Agentes do Sistema Sensorial
- Anestésicos Intravenosos
- Anestésicos Gerais
- Anestésicos
- Analgésicos, Não Narcóticos
- Agonistas de Receptores Alfa-2 Adrenérgicos
- Alfa-Agonistas Adrenérgicos
- Agonistas Adrenérgicos
- Hipnóticos e Sedativos
- Propofol
- Dexmedetomidina
Outros números de identificação do estudo
- PreopDXM_PPF
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