https://www.vetnurse.co.uk/f/clinical-discussions/20740/calculation-for-anaesthetic-circuit-bagI know the calculations for the gas flow rates but is there a calculation to determine which size bag to attach to the anaesthetic circuits? Thank you :)en-USTelligent Community 10https://www.vetnurse.co.uk/thread/140421?ContentTypeID=1Sun, 03 Mar 2013 21:12:20 GMT1a0763ec-3885-442c-853e-6cef656dfec5:a0823ad7-4631-4309-9095-7f678e3f7375BTCC Fan RVN<p>Interesting!</p><div style="clear:both;"></div>https://www.vetnurse.co.uk/thread/140411?ContentTypeID=1Sun, 03 Mar 2013 18:53:36 GMT1a0763ec-3885-442c-853e-6cef656dfec5:f2c7e938-c69f-460a-90ad-b026bb0280d1bunnyshouse<p>Sounds great. Thank you :)</p><div style="clear:both;"></div>https://www.vetnurse.co.uk/thread/140410?ContentTypeID=1Sun, 03 Mar 2013 18:46:38 GMT1a0763ec-3885-442c-853e-6cef656dfec5:7c8eedf5-c378-4210-9354-2e726183dc43Helen Tottey<p>What a great answer!</p><div style="clear:both;"></div>https://www.vetnurse.co.uk/thread/140407?ContentTypeID=1Sun, 03 Mar 2013 16:57:36 GMT1a0763ec-3885-442c-853e-6cef656dfec5:1ea071cc-a18d-45a1-bcac-935c8831275fF1chick<p><span>&#39;The general rule is that the bag should be able to accommodate 6 x the normal tidal volume of the patient, so for a 40kg animal that would be 40 (kg) x 10ml/kg (tidal volume) x 6 = 2.4L. This means that the standard 2L bag is suitable for patients up to about 40kg, but you then need to think about changing to a bigger one after that. In practice, however, I don&rsquo;t always do that, and all you are really looking for is that the bag doesn&rsquo;t become over-distended when the animal breathes out, and doesn&rsquo;t collapse completely when they breathe in.&#39;</span></p> <p>&nbsp;</p> <p><span>That was an e-mail I got having asked Derek Flacherty, the GUVS anaesthetist</span></p><div style="clear:both;"></div>