Which induction agent is dosed at 0.3 mg/kg IV for RSI?

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Multiple Choice

Which induction agent is dosed at 0.3 mg/kg IV for RSI?

Explanation:
In RSI you want a rapid loss of consciousness with as little disruption to blood pressure as possible, so perfusion to the brain and airway structures remains adequate. Etomidate at 0.3 mg/kg IV fits this need because it induces hypnosis quickly—typically within 30 to 60 seconds—while preserving cardiovascular stability. That stability is especially valuable in patients who may be hypotensive or intravascularly depleted, where other agents could drop blood pressure further. Propofol, by contrast, tends to cause vasodilation and myocardial depression, so the induction dose is higher (usually 1–2 mg/kg) and can lead to significant hypotension. Fentanyl is an opioid and provides analgesia rather than reliable unconsciousness on its own; it’s not used as the sole induction agent for RSI. Midazolam can be used for sedation, but it has slower onset and more potential for respiratory depression and hypotension at higher doses, making it less ideal as the sole induction agent for RSI. So the induction dose of 0.3 mg/kg IV corresponds to etomidate, chosen for rapid onset with minimal hemodynamic impact.

In RSI you want a rapid loss of consciousness with as little disruption to blood pressure as possible, so perfusion to the brain and airway structures remains adequate. Etomidate at 0.3 mg/kg IV fits this need because it induces hypnosis quickly—typically within 30 to 60 seconds—while preserving cardiovascular stability. That stability is especially valuable in patients who may be hypotensive or intravascularly depleted, where other agents could drop blood pressure further.

Propofol, by contrast, tends to cause vasodilation and myocardial depression, so the induction dose is higher (usually 1–2 mg/kg) and can lead to significant hypotension. Fentanyl is an opioid and provides analgesia rather than reliable unconsciousness on its own; it’s not used as the sole induction agent for RSI. Midazolam can be used for sedation, but it has slower onset and more potential for respiratory depression and hypotension at higher doses, making it less ideal as the sole induction agent for RSI.

So the induction dose of 0.3 mg/kg IV corresponds to etomidate, chosen for rapid onset with minimal hemodynamic impact.

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