MEOPA (Equimolar Mix of Oxygen and Nitrogen Monoxide) Versus Local Anesthesia for Analgesia During Chorionic Villus Sampling.
MEOPA (Equimolar Mix of Oxygen and Nitrogen Monoxide) Versus Local Anesthesia for Analgesia During Chorionic Villus Sampling.
determine if efficiency of MEOPA anesthesia is at least equivalent to local anesthetics into the chorionic villus sampling in the first trimester of pregnancy
Compare anxiety discomfort and side effects
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Exclusion Criteria: