Which maneuver would slow induction of inhalational anesthesia through a tracheostomy?

Which maneuver would slow induction of inhalational anesthesia through a tracheostomy?

• A. Using sevoflurane instead of isoflurane (MAC-equivalent)
• B. Increasing fresh gas flow from 2 to 6 L/min
• C. Esmolol 30 mg IV
• D. None of the above

Answer: (D)

The speed of inhaled anesthesia induction depends on how quickly the alveolar concentration of the agent can rise to effective brain levels. This is governed by two main factors: delivery to the alveoli (ventilation and fresh gas flow) and uptake into blood/tissues (cardiac output and the agent’s solubility in blood). Switching to a less soluble agent at the same potency tends to speed induction, because the agent equilibrates with blood more quickly and reaches the brain faster. Increasing fresh gas flow delivers more anesthetic to the alveoli per unit time, also speeding induction. Using a beta-blocker like esmolol can alter hemodynamics, but it does not provide a reliable, controlled way to slow the rate of induction; its effect on uptake is variable and not a standard method to slow induction. Therefore, none of these maneuvers reliably slow induction through a tracheostomy.

The speed of inhaled anesthesia induction depends on how quickly the alveolar concentration of the agent can rise to effective brain levels. This is governed by two main factors: delivery to the alveoli (ventilation and fresh gas flow) and uptake into blood/tissues (cardiac output and the agent’s solubility in blood).

Switching to a less soluble agent at the same potency tends to speed induction, because the agent equilibrates with blood more quickly and reaches the brain faster. Increasing fresh gas flow delivers more anesthetic to the alveoli per unit time, also speeding induction. Using a beta-blocker like esmolol can alter hemodynamics, but it does not provide a reliable, controlled way to slow the rate of induction; its effect on uptake is variable and not a standard method to slow induction.

Therefore, none of these maneuvers reliably slow induction through a tracheostomy.