Inhalational Induction

Question 1

8 factors for Faster Inhalational Induction

Answer 1

1. Rapid buildup of agent in the alveoli
2. low blood solubility of the agent
3. higher percentage on the vaporizer dial
4. higher fresh gas flows
5. smaller anesthesia circuit volume
6. low cardiac output
7. higher minute ventilation
8. low functional residual capacity (FRC)

Question 2

8 factors for Slower Inhalational Induction

Answer 2

1. slower build up of agent in the alveoli
2. higher blood solubility of the agent
3. lower percentage on the vaporizer dial
4. lower fresh gas flows
5. larger circuit volume
6. high cardiac output
7. lower minute ventilation
8. high functional residual capacity (FRC)

Question 3

Factors that delay emergence from inhalational anesthetics (13)

Answer 3

1. older pts (geriatric pts)
2. obese pts
3. long operation times
4. operations where higher concentrations of agent were used
5. low fresh gas flows during emergence
6. high blood solubility of the volatile agent
7. lower minute ventilation
8. higher doses of narcotics
9. closed APL valve
10. higher functional residual capacity (FRC)
11. lung disease (decreased alveolar capillary diffusion)
12. low cardiac output
13. hypothermia

Question 4

3 things that happen from low cardiac output

Answer 4

1. faster build up of agent concentration in the blood
2. faster buildup of agent concentration in the lungs
3. faster inhalational induction

Question 5

Advantages of low fresh gas flow

Answer 5

1. cost effective
2. preserves tracheal heat and moisture
3. slows the drying process of soda lime CO2 granules
4. better preserves the pt’s body temperature

Question 6

disadvantages of low fresh gas flow

Answer 6

1. slower inhalational induction

2. slower emergence from anesthesia

Question 7

Disadvantages of high fresh gas flow

Answer 7

1. expensive
2. dries out the pt’s airway
3. accelerates the drying out of the soda lime CO2 granules

Question 8

Advantages of high fresh gas flow

Answer 8

1. faster inhalational induction

2. faster emergence from anesthesia