Anaesthesia Coffee Break Ultrasound theory, technique and useful tips and tricks!
Oct 3, 2021
Discover the powerful role of ultrasound in anaesthesia, from regional techniques to vascular access. Learn about the mechanics behind image creation and tricks for better needle visualization. The hosts delve into the nuances of frequency and acoustic impedance, tackling challenges with deep blocks and discussing Doppler effects for blood flow measurement. Get practical tips for successful ultrasound adoption in your practice and enhance your skills with insightful tricks and techniques!
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Optimize Probe Angle For Needle Visibility
- Turn the probe so the ultrasound beam is closer to 90° to the needle to improve needle visibility.
- Reorienting the probe often beats changing needle angle when the needle is steep and invisible.
How Ultrasound Builds An Image
- Ultrasound images form from piezoelectric crystals sending and receiving timed sound waves to calculate depth.
- The device uses wavelength, frequency and travel time to compute distance and build the image.
Why Bone Produces Bright Lines And Shadow
- Reflection, refraction and absorption determine ultrasound appearance and artifacts.
- Bone causes strong specular reflection and acoustic shadowing because of large impedance mismatch.