DESFLURANE & ITS VAPORIZER

🎈#Desflurane has a saturated vapour pressure of 664 mm of Hg @ 20 degree C and a boiling point of 22.6 degree C

🎈This is less than other agents; thus it requires a specific vaporizer

🎈The Tec Mk 6 vaporizer is a plenum vaporizer and is designed for desflurane.

🎈It operates at 39 °C and 2 atmospheres (All other vaporizers operate at atmospheric pressure and temperature). 

🎈It takes 5–10 minutes to warm up to the correct temperature.

🎈It will not operate until the vaporisation chamber has reached 39 °C.

🎈It needs an external power supply, and it has a 9 V battery as a backup in case of mains failure.

🎈Unlike other plenum vaporisers, the Tec Mk 6 vaporizer is designed so that the fresh gas flow does not enter the chamber. The desflurane vapour is added to the fresh gas flow as it leaves the vaporiser.

#anesthesia , #anaesthesia , #anesthetist

Reference: Al-Shaikh B, Stacey S. Essentials of Anaesthetic Equipment, 2nd edn. Edinburgh: Churchill Livingstone, 2002

#Hyponatremia CORRECTION ; a template for #Anesthesiologists and #CriticalCare #Physicians

FLOWMETER : PRINCIPLES BEHIND

🔸The flowmeter / rotameter is a variable-orifice device used to measure the flow of oxygen, air and nitrous oxide in the anesthesia machine

🔸It usually contains a bobbin

🔸The pressure of gas beneath the bobbin pushes it up the flowmeter until the force beneath it is balanced by the force of gravity pulling it back to its resting position. 

🔸The variable orifice of the flowmeter means that the flow of gas past the bobbin at low flows is laminar, but at high flows it is turbulent. 

🔸The flutes on the bobbin are to ensure continuous movement of the bobbin as gas passes it, showing that it is not stuck. 

🔸The variable orifice of the flowmeter is responsible for the turbulent flow.