circle circuit and Nitrous?

Re: circle circuit and Nitrous?

Susan Jackson — Wed, 20 Apr 2011 20:18:31 GMT

[quote user="Juliet Drummond DAVN (med) RVN D32/33"]

according to veterinary anaesthesia (hall and clark ed. 10 page 415)

nitrous can be used with both non-rebreathing and circle systems. the proportion of oxygen in the mixture must be a minimum of 30%, nitrous should not be used in low-flow systems (e.g. circle or humphrey ade), unless an oxygen analyser is incorporated into the brathing system. failure of the oxygensupply is disasterous, most modern machines incorporate an alarm or nitrous cut-off in case this happens. the safest delivery of o2/n2o is through a mixer system e.g. quantiflex.

i would not use nitrous in a closed circle system without a method of monitoring O2 levels.

hope this helps.

[/quote]

I think I read that and that's why I had in my head not to use it. Wish I had capnography but haven't used it since referral practice.

Re: circle circuit and Nitrous?

Juliet Drummond DAVN (med) RVN D32/33 — Wed, 20 Apr 2011 17:39:13 GMT

according to veterinary anaesthesia (hall and clark ed. 10 page 415)

i would not use nitrous in a closed circle system without a method of monitoring O2 levels.

hope this helps.

Re: circle circuit and Nitrous?

mrsspider — Wed, 20 Apr 2011 16:03:21 GMT

There does seem to be varying answers on this, I am trying to find something about it elsewhere but not having much luck. I guess if I am using a catnograph then as long as the O2 levels are good then it should be fine. Thanks for all answers so far X

Re: circle circuit and Nitrous?

Nick Shackleton — Tue, 19 Apr 2011 22:19:46 GMT

[quote user="Susan Jackson"]

Now I'm confused. As a circle circuit I would still say no. You can decide on the nitrous going in but it may circulate and concentrations may increase. Therefore as you won't know what percentage is circulating you shouldn't.

Any one else?

[/quote]

this is why it's advisable to use capnography so that you can alter your flow rates as required. I have always been taught 50/50 mix when using nitrous with a circle.

Re: circle circuit and Nitrous?

Susan Jackson — Tue, 19 Apr 2011 22:05:07 GMT

Any one else?

Re: circle circuit and Nitrous?

Nick Shackleton — Tue, 19 Apr 2011 21:01:57 GMT

[quote user="dinkyd"]

Nitrous is fine to be used as long as the concentration does not exceed 50% ie you would use 1L 02 : 1L NO2.

[/quote]

What Dinky said plus if you got it available use capnography so you can monitor CO2/O2 levels in inspired and expired gases

Re: circle circuit and Nitrous?

dinkyd — Tue, 19 Apr 2011 20:52:52 GMT

Nitrous is fine to be used as long as the concentration does not exceed 50% ie you would use 1L 02 : 1L NO2.