Anaesthesia Coffee Break Miller's Anesthesia proven WRONG by Dr Stan! What REALLY happens to volatile washout with changes in cardiac output
Feb 19, 2021
Dive into the intriguing dynamics of volatile washout and cardiac output. Discover how traditional teachings, like those in a popular anesthesia textbook, may not hold up under scrutiny. Listen as the hosts unveil the surprising outcomes of simulations that challenge conventional beliefs. High cardiac output can actually speed up washout, unless muscle compartments are saturated. The discussion also touches on study strategies for anesthesia exams and the nuances of clinical practice versus textbook knowledge.
AI Snips
Chapters
Transcript
Episode notes
Millers' Claim On Cardiac Output Challenged
- Miller's textbook claims increased cardiac output slows anesthetic lung clearance by requiring more gas exchange volumes.
- The hosts questioned this claim and sought to test it with transparent simulations.
Clinical Washout Feels Diffusion-Limited
- Lahiru emphasises washout depends on diffusion into alveoli and ventilation rather than being ventilation-limited in practice.
- Clinically, high fresh gas flows and ventilation often reduce end-tidal volatile quickly to near zero.
Gas Man Used For Transparent Simulations
- The hosts used the Gas Man simulator to model volatile kinetics and compartments transparently.
- Gas Man implements compartmental kinetics and has been used historically to study volatile uptake and redistribution.