SVP doesn't vary with Ambient pressure. It is because of the relative increase in percentage of the SVP when compared with the decreasing Ambient pressure, the vapor output increases. Not because of the Ambient pressure per se!
@connorbrown2364 Жыл бұрын
Re. 4:24 - SVP doesn't vary with ambient pressure;SVP only varies with temperature
@akyiaaantwi55042 жыл бұрын
Wow! where has your channel been! you make concepts easy to understand! pls make more videos
@nanoukituandamakombele59433 жыл бұрын
I decided to do anaesthesia ,,thanks your videos/ lessons help me to understand ,THANKS A LOT please be my second mentor
@adams3032 жыл бұрын
I’m not sure I follow your explanation here. The variable bypass vaporiser works via a splitting ratio. The percent on the dial relates to % of Patm, but that’s just so it’s easier to work out instead of having it expressed as mmHg or kPa. Since SVP does not change with ambient pressure then it doesn’t change the output, assuming the pressure of input gas remains constant. After all it’s the partial pressure and not the concentration that exerts the anaesthetic effect right? If the des vapouriser is heated to 2x SVP and dial is kept at 6% - it’s output would be constant. It might output a larger fraction of PB at altitude, but that doesn’t alter it’s effect. The only effect I’d expect with altitude is a decrease in ambient temperature which could reduce SVP.
@RuhulAmin-ti5pg2 жыл бұрын
Thanks for the easy explanation
@jessicaleung83122 жыл бұрын
Fantastic explanation
@johnolive94773 жыл бұрын
Great explanation. Thanks!
@freecopt40032 жыл бұрын
You are my physics teacher Thanks
@nevilleslightlylargerbotto17262 жыл бұрын
I get why you have to pressurize desflurane so as to make it more likely to remain a liquid and not just all evaporate. But why additionally heat it? Doesn’t the tendency of heating liquids and causing them to turn into vapors defeat the purpose of so highly pressurizing desflurane in the first place? It seems you put in one mechanism to make it a liquid (2 x atm) and another to offset that and keep it a gas (heating it to 39 Celsius). That confuses me
@vlk092 Жыл бұрын
you keep it at a constant temperature so that the saturated vapour pressure is maintained constant. since the desflurane vaporizer is not a variable bypass vaporizer and delivers the gas directly, if you dont keep the pressure and temperature always the same, you would be delivering variable amounts of the gas