Count to 10 - Anaesthetic Primary Podcast EP26 – Applied Cardiac Physiology Part 1 | Anaesthetic Primary Topic | Cardiac Physiology | CT10
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Sep 24, 2024 Dive into the fascinating world of applied cardiac physiology! Discover how pneumoperitoneum affects the cardiovascular system, especially during laparoscopic surgeries. Learn about the body's responses to changes in patient position, exercise, and the Valsalva maneuver. Explore the impact of aging and obesity on heart function, and gain insights into the complexities of shock. This engaging discussion promises to deepen your understanding of cardiovascular dynamics in anesthetic management.
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How Exercise Boosts Cardiac Output
- Exercise raises cardiac output mainly by increasing heart rate rather than stroke volume at maximal effort.
- Anaerobic threshold occurs at ~40–60% VO2max and marks exponential lactate rise.
Four Phases Of Valsalva Explained
- Valsalva creates four phases from initial BP rise to phase 4 overshoot with reflex bradycardia.
- The manoeuvre mainly works via raised intrathoracic pressure altering venous return and baroreceptor firing.
Use Valsalva Clinically
- Use the Valsalva ratio (max HR in phase 2 ÷ min HR in phase 4) to screen autonomic dysfunction; normal >1.5.
- Use a Valsalva to terminate SVT and to reveal murmurs altered by decreased preload.