Premedication with intravenous low-dose ketamine suppresses fentanyl-induced cough.

Full Abstract

STUDY

OBJECTIVE:
To evaluate the effect of low-dose ketamine on fentanyl-induced cough.

DESIGN:
Prospective, randomized, double-blind, placebo-controlled clinical trial.

SETTING:
Medical center hospital.

PATIENTS:
360 ASA physical status I-II patients aged 18 to 65 years, weighing between 40 and 80 kg, and scheduled for elective surgery during general anesthesia.

INTERVENTIONS AND MEASUREMENTS:
Patients were randomly assigned to receive either ketamine 0.15 mg/kg or placebo (equal volume of 0.9% saline) given intravenously over 10 seconds, one minute before administration of fentanyl (1.5 microg/kg IV, injected within 5 seconds), during induction of general anesthesia. Any episode of cough was classified as coughing and the onset time of cough (the time of the first episode of cough) was observed for one minute after fentanyl administration by a blinded observer. Severity of coughing was graded based on the number of episodes of coughing (mild, 1-2; moderate, 3-5; and severe, >5). Blood pressure, heart rate, and pulse oximetry oxygen saturation (Spo2) were recorded before giving ketamine or 0.9% saline and 1 minute after fentanyl injections.

MAIN RESULTS:
After the intravenous injection of fentanyl bolus, patients in the placebo group showed significantly higher frequency cough than those in the ketamine pretreatment group (21.6% vs 7.2%, P<0.05), and onset time of the ketamine group was significantly longer than that of the control group (20+/-8 vs 15+/-10 seconds, P<0.01). However, no difference in cough severity was observed between the two groups.

CONCLUSION:
Low-dose ketamine (0.15 mg/kg IV) effectively reduces fentanyl-induced cough and delays the onset time of cough.

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Author information

Author/s: Yeh, Chun-Chang (CC); Wu, Ching-Tang (CT); Huh, Billy K (BK); Lee, Meei-Shyuan (MS); Lin, Shinn-Long (SL); J Sheen, Michael (M); Wong, Chih-Shung (CS);

Affiliation: Department of Anesthesiology, Tri-Service General Hospital and National Defense Medical Center, Neihu 114, Taipei, Taiwan, Republic of China.

Journal and publication information

Publication Type: Evaluation Studies; Journal Article; Randomized Controlled Trial

Journal: Journal of clinical anesthesia (J Clin Anesth), published in United States. (Language: eng)

Reference: 2007-Feb; vol 19 (issue 1) : pp 53-6

Dates: Created 2007/02/26; Completed 2007/04/19;

PMID: 17321928, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Anesthesia, General
Anesthetics, Dissociative - therapeutic use
Anesthetics, Intravenous - adverse effects
Cough - chemically induced; prevention & control
Double-Blind Method
Female
Fentanyl - adverse effects

Fentanyl - adverse effects
Humans
Injections, Intravenous
Ketamine - therapeutic use
Male
Middle Aged
Premedication
Prospective Studies

Associated Chemicals: Anesthetics, Dissociative (0) ; Anesthetics, Intravenous (0) ; Fentanyl (437-38-7) ; Ketamine (6740-88-1)

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