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What is composed of:
94% Ca(OH)2 (ca hydroxide)
5% NaOH (activator)
1% KOH(activator)
Water 14-19% (critical for absorption)
Soda lime
(Sodasorb, sodalime)
What is composed of:
80% Ca(OH)2
20% Ba(OH)2-8H20
Barium lime
(Baralime)
What is the main active ingredient in soda lime?
Ca(OH)2
What is the main final product of the absorption of CO2?
CaCO3, with the net production of water and heat
Name the 3 reactions in soda lime?
1. CO2 + H2O --> H2CO3 (carbonic acid)
2. H2CO3 + 2NaOH --> Na2CO3 (Na carbonate) +2 H2O + heat
3. Na2CO3 + Ca(OH)2 (ca hydroxide) --> CaCO3 + 2 NaOH + heat
What is the end product of soda lime?
calcium carbonate, heat and water
What is the catalyst for the soda lime reaction?
Na Hydroxide
What is the absorbtive capacity of soda lime?
15L/100gms
If canister is warm on top what does that indicate?

on bottom?
top=fresh canister
bottom=old
What lasts longer? soda lime or baralyme?
soda lime
What is the temp in the center of the soda lime canister?
45-50 C
What is the critical pH that turns the soda lime violet?
10.3
Other than compound A what can form from the breakdown of sevo?
Formaldehyde (lung irritant, PONV)
What can form from the incomplete oxidation of nearly all the anesthetic gases (mostly desflorane D>E>I)
CO
What are s/s exposure to CO?
HA, PONV, delayed wakening, hypoxia, dizziness
Conditions that favor breakdown of absorber
dryness (water in absorbent is most impt factor)
high temp
barium containing absorbent
How can soda lime cause bronchospasm?
the granules can fragment and produce an alkaline dust
What is added to the granules to provide hardiness and minimize dust formation?
silica
If you come into the OR monday AM and gas flow is on machine...what should you do?
toss out the CO2 cannister
How is compound A formed?
The absorbent pulls an H and an F off the sevo molecule = C4H2F6
keep flows > 2L/min for what?
sevo to avoid compound A formation
What binds to Hb 225 times better than O2?
CO
What is toxicity of CO related to?

2 things
concentration and duration
What is the answer to the soda lime problem?
Amsorb plus!
only calcium hydroxide (CaOH)2
No compound A, No CO, no bad stuff
when dye changes it doesn't go back to white, like with soda lime