What is an Optimal Dosage of Alfentanil for Minimizing the Hemodynamic Change to Endotracheal Intubation during Anesthesia Induction with Propofol Target-Controlled Infusion? |
Hyoung Ki Min, Woo Jae Jeon, Serk Young Jeong, Jae Hang Shim, Sang Yoon Cho, Jong Hoon Yeom, Woo Jong Shin, Kyoung Hun Kim |
Department of Anesthesiology and Pain Medicine, College of Medicine, Hanyang University, Seoul, Korea. goldnan@hanyang.ac.kr |
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Abstract |
BACKGROUND Laryngoscopy and tracheal intubation are associated with hemodynamic pressor responses, which can have adverse effects. During anesthesia induction with propofol target-controlled infusion (TCI), we aimed to determine the most appropriate dosage of alfentanil required for intubation, using a steady effect-site concentration of propofol and with the use of vecuronium.
METHODS Eighty ASA class 1 or 2 patients presenting for elective surgery were allocated at random to one of four groups. Anesthesia was induced in all patients with TCI of propofol target concentration 8 microgram /ml, followed by vecuronium (0.12 mg/kg). This was reduced to 5microgram/ml when the effect-site concentration had been 4microgram/ml.
After the effect-site concentrations had reached to 5microgram/ml, control group received normal saline, group 1 received alfentanil 10microgram/kg, group 2 received alfentanil 20microgram/kg, and group 3 received alfentanil 30microgram/kg. Laryngoscopy and intubation were performed 90 s later. Heart rate was monitored continuously. Systolic blood pressure, diastolic blood pressure and mean arterial pressure were measured at pre-induction, post-induction (pre-intubation) and post-intubation, respectively.
Complications such as hypotention and bradycardia were recorded until 5 minutes had elapsed after tracheal intubation.
RESULTS Control group showed significant increases associated with tracheal intubation in all hemodynamic variables (P < 0.05). Post-intubation values decreased significantly from pre-induction values in groups 1, 2 and 3 (P < 0.05). In groups 2 and 3, hypotension and bradycardia occurred (zero in group 1) but there were no significant differences in their incidences between the three groups.
CONCLUSIONS We suggest that alfentanil 10microgram/kg constitutes the optimal dosage to obtund the hemodynamic responses to tracheal intubation, using propofol TCI (5microgram/ml) and vecuronium for induction of anesthesia. |
Key Words:
alfentanil; propofol; target-controlled infusion (TCI); tracheal intubation |
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