https://www.selleckchem.com/pr....oducts/bay-k-8644.ht
eatment approaches. To compare the effect of inhaled nitrous oxide (INO) on pain control during in-office hysteroscopy with 1% lidocaine paracervical infiltration and no analgesic. Single-blind stratified randomised clinical trial with masked assessment by a third party. Department of Obstetrics and Gynaecology in a Spanish hospital. Women who underwent hysteroscopy. Patients were stratified into three groups according to the purpose of the hysteroscopy (biopsy, polypectomy or tubal sterilisation) and then assigned to different treat