Phenylephrine tightens blood vessels, albuterol opens the airway, and Precedex turns down the sympathetic nervous system. All three drugs send their message through G protein-coupled receptors. Sachi, a practicing CRNA and founder of The CRNA Club, starts with what a receptor is, compares the four major receptor families, and follows the Gq, Gs, and Gi pathways step by step, from the receptor to the second messenger to the effect you see at the bedside.
FREE GPCR SIGNALING CHEAT SHEET: Download the GPCR Signaling Cheat Sheet - Gq, Gs, and Gi routes, second messengers, and the hook-drug chains on one page
FREE RESOURCES TO HELP YOU ON YOUR CRNA JOURNEY:
Transcript Analyzer - See your cumulative, science, and last-60-credit GPAs
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IN THIS EPISODE:
- What a receptor is and how the four major receptor families compare
- How the G protein relay works, and what Gq-coupled, Gs-coupled, and Gi-coupled mean
- How the Gq pathway releases stored calcium, and why calcium doesn't always mean contraction
- Why beta-1 and beta-2 both use Gs and still act differently in heart muscle and airway smooth muscle
- How milrinone raises cyclic AMP by blocking phosphodiesterase 3 instead of activating a receptor
- How the Gi pathway lowers cyclic AMP and opens potassium channels, with a Precedex bedside case
- How to walk through a drug's mechanism in a CRNA school interview
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