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. A particular aspect of this study is that induction is provided by a closed-loop system which delivers propofol according to bispectral index.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
97
A short preanesthetic hypnosis before induction of anesthesia
Standard care before induction of anesthesia
Hopital Foch
Suresnes, France
Administered dose of propofol required to obtain the induction of anesthesia (bispectral index <60 for at least 30 seconds)
Time frame: one hour
calculated target plasma concentration corresponding to induction of anesthesia (bispectral index <60 for at least 30 seconds)
Time frame: one hour
pain of injection
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 = 2)
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 realized.
Time frame: one hour
characteristics of the hypnotic procedure
* For speed: focus obtained in a very fast (1), fast (2), medium (3), delayed (4), impossible to obtain (5). * For quality: very deep (1), deep (2), medium (3), superficial (4), not obtained (5)
Time frame: one hour
Patient assessment of the induction of anesthesia
4-point scale.
Time frame: one hour
Time to loss of consciousness
loss of eyelash reflex
Time frame: one hour
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