Anaesthetic machines Flashcards
If gauge registers 6,850 kPa how many litres of O2 remain?
Vused = Pused/Pfull x Vfull
Vused = 6850/13700 x 680 = 340 L
How many literes does a full E sized cylinder contain
680l
Should APL valve be open or close when not giving IPPV
FULLY OPEN
Name non rebreathing systems
Lack (incl. MiniLack)
T-piece (various versions)
Bain
Equation for calculating FGF using circuit factor
MRV = resp rate x tidal volume (10-20 ml/kg)
FGF = MRV x “circuit factor”
Circuit factor of lack
0.8-1
Circuit factor of Tpiece
2.5-3.5
Circuit factor of bain
1-3.5
Calculate FGF required for 10 kg dog taking 20 breaths/min & using a Lack
20 breaths/min x 15 ml/kg x 10 kg x 1 = 3L/min
Calculating FGF using ml/kg/min
Lack 150-200ml/kg/min
T-piece 400-600ml/kg/min
Bain 200-600ml/kg/min
Calculate FGF required for a 10 kg dog using a Lack
200 ml/kg/min x 10 kg= 2 L/min
When should I use a parallel lack
Patients 10 kg & over
Not suitable for prolonged IPPV
When should I use a MiniLack system
Patients 10 kg & less
Not suitable for prolonged IPPV
Jackson Rees modification of a T piece has what benefits?
Allows observation of respiration
Allows more control during IPPV
Do T pieces have an APL valve
No
What is a mapleson D tpiece
Adaptation to facilitate scavenging
Includes closed reservoir bag & APL valve
When should I use a T-piece (Modified/basic/Mapleson D)
Patients up to 10 kg
Suitable for IPPV
Difference between coaxial bane and lack
COAXIAL BAIN -fresh gas passes up INner tube and expired gas out via outer tube
COAXIAL LACK -fresh gas passes up outer tube and expired gas out via inner tube
When should I use a T-piece (Modified/basic/Mapleson D)
Patients 10 kg & above
Suitable for IPPV
T/F Rebreathing systems are suitable for small patients
False! They are unsuitable as there is a greater resistance
