ICU Primary PrepCast # Epi 69 - ICU Primary Snippet 12 - Physiological Control of SVR
Mar 24, 2023
Delving into the complex world of systemic vascular resistance, this podcast covers the impact of vascular radius, chemoreceptors, hormones, and local factors on regulating vascular resistance.
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SVR Control
- SVR is primarily controlled by changing the radius of arterioles.
- Systemic and local factors influence this radius, impacting overall SVR.
Vessel Size and Resistance
- Smaller arteries and arterioles contribute significantly to total resistance, around 70%.
- Larger arteries contribute minimally, only needing a small radius decrease for a substantial resistance change.
Systemic SVR Control
- Systemic factors like chemoreceptors and baroreceptors influence SVR.
- These respond to stimuli like hypoxia and volume changes, affecting sympathetic activity and SVR.