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Optimal effect-site concentration of remifentanil for preventing cough during removal of the double-lumen endotracheal tube from sevoflurane-remifentanil anesthesia

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ABSTRACT

Opioids are used as a treatment for coughing. Recent studies have reported an antitussive effect of remifentanil during recovery from general anesthesia by suppressed coughing. The coughing reflex may differ throughout the respiratory tract from the larynx to the bronchi. But the proper dose of remifentanil to prevent cough during double-lumen tube (DLT) extubation is unknown.

Twenty-five ASA physical status 1 and 2 patients, 20 to 65 years of age who were undergoing video-assisted thoracoscopic lung surgery requiring 1-lung ventilation were enrolled. The effective effect-site concentration (Ce) of remifentanil for 50% and 95% of patients (EC50 and EC95) for preventing cough was determined using the isotonic regression method with a bootstrapping approach, following the Dixon up-and-down method. Recovery profiles and hemodynamic values after anesthesia were compared between patients with cough and patients without cough.

EC50 and EC95 of remifentanil was 1.670 ng/mL [95% confidence interval (95% CI) 1.393–1.806] and 2.275 ng/mL (95% CI 1.950–2.263), respectively. There were no differences in recovery profiles and hemodynamic values after anesthesia between patients with/without cough. No patients suffered respiratory complications during the emergence period.

Remifentanil can be a safe and reliable method of cough prevention during emergence from sevoflurane anesthesia after thoracic surgery requiring DLT. EC50 and EC95 of remifentanil that suppresses coughing is 1.670 and 2.275 ng/mL, respectively.

No MeSH data available.


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Pooled adjacent violators algorithm response rate. The EC50 of remifentanil was 1.670 ng/mL (95% CI 1.393–1.806). The EC95 of remifentanil was 2.275 ng/mL (95% CI 1.950–2.463). CI = confidence interval, EC50 = effective Ce of remifentanil for suppression of emergence cough in 50% of patients, EC95 = effective Ce of remifentanil for suppression of emergence cough in 95% of patients.
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Figure 2: Pooled adjacent violators algorithm response rate. The EC50 of remifentanil was 1.670 ng/mL (95% CI 1.393–1.806). The EC95 of remifentanil was 2.275 ng/mL (95% CI 1.950–2.463). CI = confidence interval, EC50 = effective Ce of remifentanil for suppression of emergence cough in 50% of patients, EC95 = effective Ce of remifentanil for suppression of emergence cough in 95% of patients.

Mentions: The up-and-down results in consecutive patients and PAVA response rate are shown in Figs. 1 and 2. The EC50 of remifentanil needed to prevent cough during emergence, estimated by the Dixon method, was 1.75 ng/mL ± 0.27. EC50 and EC95 of remifentanil as estimated by the isotonic regression model with a bootstrapping approach was 1.670 ng/mL (95% CI 1.393–1.806) and 2.275 ng/mL (95% CI 1.950–2.263), respectively.


Optimal effect-site concentration of remifentanil for preventing cough during removal of the double-lumen endotracheal tube from sevoflurane-remifentanil anesthesia
Pooled adjacent violators algorithm response rate. The EC50 of remifentanil was 1.670 ng/mL (95% CI 1.393–1.806). The EC95 of remifentanil was 2.275 ng/mL (95% CI 1.950–2.463). CI = confidence interval, EC50 = effective Ce of remifentanil for suppression of emergence cough in 50% of patients, EC95 = effective Ce of remifentanil for suppression of emergence cough in 95% of patients.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4998462&req=5

Figure 2: Pooled adjacent violators algorithm response rate. The EC50 of remifentanil was 1.670 ng/mL (95% CI 1.393–1.806). The EC95 of remifentanil was 2.275 ng/mL (95% CI 1.950–2.463). CI = confidence interval, EC50 = effective Ce of remifentanil for suppression of emergence cough in 50% of patients, EC95 = effective Ce of remifentanil for suppression of emergence cough in 95% of patients.
Mentions: The up-and-down results in consecutive patients and PAVA response rate are shown in Figs. 1 and 2. The EC50 of remifentanil needed to prevent cough during emergence, estimated by the Dixon method, was 1.75 ng/mL ± 0.27. EC50 and EC95 of remifentanil as estimated by the isotonic regression model with a bootstrapping approach was 1.670 ng/mL (95% CI 1.393–1.806) and 2.275 ng/mL (95% CI 1.950–2.263), respectively.

View Article: PubMed Central - PubMed

ABSTRACT

Opioids are used as a treatment for coughing. Recent studies have reported an antitussive effect of remifentanil during recovery from general anesthesia by suppressed coughing. The coughing reflex may differ throughout the respiratory tract from the larynx to the bronchi. But the proper dose of remifentanil to prevent cough during double-lumen tube (DLT) extubation is unknown.

Twenty-five ASA physical status 1 and 2 patients, 20 to 65 years of age who were undergoing video-assisted thoracoscopic lung surgery requiring 1-lung ventilation were enrolled. The effective effect-site concentration (Ce) of remifentanil for 50% and 95% of patients (EC50 and EC95) for preventing cough was determined using the isotonic regression method with a bootstrapping approach, following the Dixon up-and-down method. Recovery profiles and hemodynamic values after anesthesia were compared between patients with cough and patients without cough.

EC50 and EC95 of remifentanil was 1.670 ng/mL [95% confidence interval (95% CI) 1.393–1.806] and 2.275 ng/mL (95% CI 1.950–2.263), respectively. There were no differences in recovery profiles and hemodynamic values after anesthesia between patients with/without cough. No patients suffered respiratory complications during the emergence period.

Remifentanil can be a safe and reliable method of cough prevention during emergence from sevoflurane anesthesia after thoracic surgery requiring DLT. EC50 and EC95 of remifentanil that suppresses coughing is 1.670 and 2.275 ng/mL, respectively.

No MeSH data available.


Related in: MedlinePlus