This is the protocol for a review and there is no abstract. The objectives are as follows:
The main objective will be to explore the efficacy and safety of inhaled analgesia as pain relief for women in labour planning a vaginal delivery. Although important to look at, the effects of occupational exposure and toxic effects on reproduction for maternity health care workers will only be found in large-scale epidemiological studies. Since we will only include intervention studies (see Types of studies), we will not include this objective in this review.