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Valley CO2 Absorbers
| Question | Answer |
|---|---|
| Why are soda lime granules of a certain size? | The size provides an appropriate balance between absorptive efficiency (surface area) and resistance to airflow (channeling) |
| What is channeling? What causes channeling? | Channeling is the preferential passage of gases through the soda lime canister through low resistance pathways. Channeling is most frequently caused by loose packing of absorbent granules. |
| What problem will develop if there is channeling through a CO2 absorber? | Rebreathing CO2 would occur if channeling is present. |
| What is recommended mesh size for soda granules? This recommended size represents a compromise between what two factors? | Optimal size of 4-8 mesh represents a compromise between absorptive capacity and resistance to air flow through the canister. |
| What is the advantae and what is the disadvantage of small soda lime granules? | The advantage is increased absorptive capacity due to increased surface area. The disadvantage is that smaller granules also lead to increased resistance to gas flow due to smaller interspaces. |
| What happens to the circle system if the plastic packing wrapper inadvertently left on the CO2 absorption canister? | A total obstruction of the circle system occurs if the clear plastic shipping wrapper is not removed from the CO2 canister before use. |
| When the soda lime becomes exhausted, what is seen and how is the problem corrected? | The soda lime in the CO2 canister changes to a violet color when exhausted. High fresh gas flows are used to blow CO2 out of the system. The canister should be changed after the case. |
| The soda lime canister turns blue during the case, and it is not possible to change it. What should be done to compensate for this? | Increase the fresh gas flow rate. |
| List three indicators for exhaustion of soda lime. | 1)The absorbent turns color, 2)the inspired CO2 concentration increases (because of re-breathing), and 3)the patient shows signs of CO2 retention including flushed dry skin, tachycardia, dysrhythmias and hypertension. |
| List four initial signs and symptoms exhibited by the patient when soda lime becomes exhaused. | Hypercapnia causes 1)increased blood pressure, 2)increased pulse, 3)dry flushed skin, 4)cardiac arrhythmias |
| When filled, what % of the space in a soda lime canister is air? | About 50%. The air space occupies 48-55% of the volume of the canister |
| How many liters of CO2 can be absorbed for each 100 g of soda lime? | The maximum volume of CO2 that can be absorbed is about 26 liters of CO2/100 g of commonly used absorbants |
| What are the five final products when CO2 reacts with soda lime? | Calcium carbonate (a precipitate), sodium hydroxide, potassium, hydroxide, water and heat |
| What are four final products when CO2 reacts with baralyme? | Calcium carbonate (a precipitate), barium hydroxide, water and heat |
| What is the most abundant constituent in soda lime? In baralyme? | Calcium hydroxide [Ca(OH)2] is the most abundant component of both soda lime and baralyme. Soda lime has 62% Ca(OH)2 and baralyme has 80% Ca(OH)2 |
| What is the general name for the type of chemical reaction occurring in the carbon dioxide absorber? | Neutralization. An acid is neutralized by a base. |
Created by:
SRNA84