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Objective
To compare the effect of inhaled nitrous oxide (INO) on pain control during in‐office hysteroscopy with 1% lidocaine paracervical infiltration and no analgesic.
Design
Single‐blind stratified randomised clinical trial with masked assessment by a third party.
Setting
Department of Obstetrics and Gynaecology in a Spanish hospital.
Population
Women who underwent hysteroscopy.
Methods...