ICU Primary PrepCast #036: Physics and Monitoring in ICU - Part 1
Oct 5, 2020
The podcast explores the physics of ultrasound and Doppler in ICU settings, highlighting the importance of understanding these principles. It also discusses pulse oximetry, EtCO2 measurements, and the impact of hemoglobin types on monitoring devices in critical care.
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Ultrasound Physics
- Ultrasound uses high-frequency sound waves to create images.
- Attenuation, caused by absorption, reflection, refraction, and scattering, reduces the wave's energy.
Doppler Effect in Ultrasound
- The Doppler effect describes the change in frequency due to relative movement between source and receiver.
- In ultrasound, it measures blood flow velocity based on frequency shifts.
Pulse Oximetry Principles
- Pulse oximetry uses light absorbance to measure oxygen saturation in hemoglobin.
- It compares pulsatile and non-pulsatile signals at different wavelengths.