Hypnosis may reduce patient anxiety. The main goal of this study is to determine in what extent, hypnosis decreases propofol requirement to induce induction of general anesthesia. Two particular aspects of this study are * the inclusion of women undergoing one day gynecological surgical procedures * the use of a closed-loop system which delivers propofol according to bispectral index to provide induction of anesthesia.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
80
Dept of Anesthesia, Hôpital Foch
Suresnes, France
Administered dose of propofol
Administered dose of propofol required to obtain the induction of anesthesia (bispectral index \<60 for at least 30 seconds)
Time frame: one hour
Target plasma concentration of propofol
Target plasma concentration of propofol corresponding to induction of anesthesia (bispectral index \<60 for at least 30 seconds)
Time frame: one hour
Pain of insertion of peripheral vein catheter
Pain is assessed by two criteria: * withdrawal of the arm perfused (no = 0; withdrawal = 1; violent withdrawal = 2), * spontaneous expression (no = 0; frown = 1; grin or verbal complaint = 2)
Time frame: one hour
Pain due to injection of propofol
Pain is assessed by two criteria: * withdrawal of the arm perfused (no = 0; withdrawal = 1; violent withdrawal = 2), * spontaneous expression (no = 0; frown = 1; grin or verbal complaint = 2)
Time frame: one hour
Effect of hypnosis on bispectral index
Effect of hypnosis on bispectral index before the induction of anesthesia
Time frame: one hour
Time to loss of consciousness
Time between the beginning of injection of propofol and the loss of eyelash reflex
Time frame: one hour
Hemodynamic consequences of induction of anesthesia
Heart rate and blood pressure are measured just before induction of anesthesia and once it is realized.
Time frame: one hour
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Administration of a cardio-vascular agent
Administration of ephedrine, atropine or of an hypotensive agent
Time frame: one hour
Manipulation of the airway
Necessity of a jaw thrust maneuver or of another manipulation of the airway during the induction of anesthesia
Time frame: one hour
Characteristics of the hypnotic procedure evaluated by the clinician in the group "hypnosis"
The hypnotic procedure is assessed by three criteria: * receptivity of the patient (yes/no), * rapidity of focalization procedure (very fast, fast, medium, delayed, impossible to obtain), * quality of the hypnotic trance (very deep, deep, medium, superficial, not obtained).
Time frame: one hour
Characteristics of the hypnotic procedure evaluated by the patient in the group "hypnosis"
The hypnotic procedure is assessed by a question : "Did you visualize the memory we talked about before the session ? (yes, no )
Time frame: six hours
Characteristics of the preanesthetic management evaluated by the patient (all the patients)
The preanesthetic management is assessed by one criteria:"How do you rate the quality of the preanesthetic period (from the entrance in the operating room to the induction of the general anesthesia ?" (excellent, good, average, not good)
Time frame: Six hours