To send content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about sending content to .
To send content items to your Kindle, first ensure email@example.com
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about sending to your Kindle.
Note you can select to send to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Nitrous oxide in modern anesthetic practice is used as a carrier gas for more potent volatile anesthetics during general anesthesia and as an analgesic during labor and childbirth. Nitrous oxide is easily administered to parturients using a facemask or mouthpiece and a tank or wall supply of N2O/O2 mixture. The primary controversies surrounding the use of nitrous oxide in labor analgesia consider efficacy, side effects, and safety. Possible side effects of nitrous oxide range from the unpleasant (nausea) to the potentially catastrophic (uterine atony). Most studies that have examined the efficacy of nitrous oxide in obstetric anesthesia practice have also documented side effects. There are several controversial safety issues surrounding the use of nitrous oxide in the labor and delivery suite. The potential exists for environmental contamination with resultant occupational exposure by healthcare workers and others.