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Predicted EC50 and EC95 of Remifentanil for Smooth Removal of a Laryngeal Mask Airway Under Propofol Anesthesia
Yonsei Medical Journal ; : 1128-1133, 2015.
Article in English | WPRIM | ID: wpr-150469
Responsible library: WPRO
ABSTRACT

PURPOSE:

The purpose of this study was to determine the effect-site concentration (Ce) of remifentanil in 50% of patients (EC50) and 95% of patients (EC95) for smooth laryngeal mask airway (LMA) removal in adults under propofol and remifentanil anesthesia. MATERIALS AND

METHODS:

Twenty-five patients of ASA physical status I-II and ages 18-60 years who were to undergo minor gynecological or orthopedic surgery were assessed in this study. Anesthesia was induced and maintained with propofol and remifentanil target-controlled infusion (TCI). Remifentanil was maintained at a predetermined Ce during the emergence period. The modified Dixon's up-and-down method was used to determine the remifentanil concentration, starting from 1.0 ng/mL (step size of 0.2 ng/mL). Successful removal of the LMA was regarded as absence of coughing/gagging, clenched teeth, gross purposeful movements, breath holding, laryngospasm, or desaturation to SpO2<90%.

RESULTS:

The mean+/-SD Ce of remifentanil for smooth LMA removal after propofol anesthesia was 0.83+/-0.16 ng/mL. Using isotonic regression with a bootstrapping approach, the estimated EC50 and EC95 of remifentanil Ce were 0.91 ng/mL [95% confidence interval (CI), 0.77-1.07 ng/mL] and 1.35 ng/mL (95% CI, 1.16-1.38 ng/mL), respectively.

CONCLUSION:

Our results showed that remifentanil TCI at an established Ce is a reliable technique for achieving safe and smooth emergence without coughing, laryngospasm, or other airway reflexes.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Piperidines / Gynecologic Surgical Procedures / Female / Humans / Male / Propofol / Adolescent / Treatment Outcome / Laryngeal Masks / Anesthetics, Inhalation Language: English Journal: Yonsei Medical Journal Year: 2015 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Piperidines / Gynecologic Surgical Procedures / Female / Humans / Male / Propofol / Adolescent / Treatment Outcome / Laryngeal Masks / Anesthetics, Inhalation Language: English Journal: Yonsei Medical Journal Year: 2015 Type: Article