Entonox is 50/50 Oxygen and Nitrous Oxide combination - in a premixed form - in one gas cylinder. This is not FDA approved in the US. It is not over safety concerns of using nitrous oxide and oxygen. It has been shown at varying temperatures that the premixed gas can separate in the cylinder - resulting in potential higher percentages of Nitrous Oxide being administered - and no way to regulate or control it.
Nitrous Oxide and Oxygen (N20 and 02) for pain management, is used everyday in the US in dental offices and many hospitals (in areas like Emergency Departments). The reason it has not been used more widely for Labor and Delivery is that a special "device" is needed for this application. This device "blends" Oxygen and Nitrous Oxide (at a 50/50 ratio) - and is administered by the patient through a special demand valve that they control themselves. Our company is about to re-launch such a device and you will start seeing nitrous oxide and oxygen used more often in hospitals and birth centers in the US. This is going to start happening in January!
Regarding some of the previous posts:
Workplace safety - yes this is a concern - but is dealt with by always making sure the device is connected to a "Vacuum" source to scavenge (remove)away the exhaled gas - out of the building. This virtually eliminates any exposure risks. Some other countries do not have guidlines for scavenging - which is where you see issues with workplace safety. Chronic exposure to many things is often not good - so N20 is no different than many other drugs and chemicals used in the healthcare environment.
Patient Safety - Nitrous Oxide and Oxygen has been proven (over 100 years of use) to be safe for patients. As with any medication - there are some health conditions that you would not want to use nitrous oxide with. Your medical professional would be able to advise you on this.
Environmental Issues - Yes N20 is a greenhouse gas - and is used widely for medical applications (often used by anesthesiologists). That said - medical use of N20 accounts for about 1% of greenhouse gas exposure. The majority of exposure is created by farming and agriculture related industries.
N20/02 and Epidurals - N20 and 02 are used for pain management. It will not eliminate pain - but it will help you cope with pain (which is why some will say - "it didn't work". It will not replace epidurals - and if the expectations are not realistic - it will be a negative experience by the patient. There are a few hospitals in the US that use N20/02 for labor and delivery. In most cases women that use N20/02 in the US - about 50% convert to epidurals. It is a good option compared to not having anything at all!
Benefit of using N20/02 - it is a good option for pain management - and it is patient self administered. The patient administers the N20/02 when they need it. N20/02 is a mild analgesic - and allows the patient to be conscious and in the labor and delivery setting - participate in the birth of their baby. N20/02 is very short acting (minutes) - which will allow the mother to get up and move around during her labor - and after delivery. Epidurals will potentially last for hours - confining the mother to her bed.
Again - N20/02 is not a replacement of other options - it is just a good addition - and in the labor and delivery area - an option that doesn't currently exist here in the US.
I'm not familiar with all of the rules for the forum - but if allowed I can post some links to videos and other websites.
Thanks,
Mike