What percentage of ephedrine's mechanism is indirect?

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Study for the Vasopressors and Inotropes Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What percentage of ephedrine's mechanism is indirect?

Explanation:
Ephedrine is a mixed-acting sympathomimetic, with most of its effect coming from indirect action—releasing stored norepinephrine from sympathetic nerves—which drives the majority of its cardiovascular effects. This indirect component accounts for about 70% of its mechanism. It also has a direct action on alpha and beta receptors, contributing roughly 30% of its effects. That combination explains why ephedrine raises blood pressure and heart rate through NE release, while still producing some vasoconstriction and cardiac stimulation directly. So the best answer is that approximately 70% of its mechanism is indirect, with the remaining portion from direct receptor stimulation.

Ephedrine is a mixed-acting sympathomimetic, with most of its effect coming from indirect action—releasing stored norepinephrine from sympathetic nerves—which drives the majority of its cardiovascular effects. This indirect component accounts for about 70% of its mechanism. It also has a direct action on alpha and beta receptors, contributing roughly 30% of its effects. That combination explains why ephedrine raises blood pressure and heart rate through NE release, while still producing some vasoconstriction and cardiac stimulation directly. So the best answer is that approximately 70% of its mechanism is indirect, with the remaining portion from direct receptor stimulation.

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