Count to 10 - Anaesthetic Primary Podcast EP29 – Measurement | Anaesthetic Primary Topic | Cardiac Physiology | CT10
Nov 18, 2024
Dive into the fascinating world of cardiac measurement techniques! Discover the ins and outs of non-invasive blood pressure methods, from manual auscultation to automated oscillometry. Learn about the intricacies of invasive arterial lines and the potential sources of error that can affect readings. Explore how transesophageal Doppler and the Fick principle help estimate cardiac output. Plus, wrap up with insights on exam questions tied to blood pressure and cardiac output measurement. Perfect for anyone wanting to enhance their knowledge in cardiac physiology!
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Interpret Full Blood Pressure Panel
- Use all BP outputs (systolic, diastolic, pulse pressure, MAP) to make clinical decisions rather than focusing on one value.
- Ensure cuff size follows the 40-80 rule to avoid large measurement errors.
How Oscillometric BP Derives MAP
- Oscillometry detects cuff pressure oscillations and uses amplitude patterns to derive systolic, mean and diastolic pressures.
- The MAP from oscillometry is most reliable while diastolic is least reliable.
Maintain Proper Arterial Line Setup
- Set up arterial lines with a short stiff cannula and non-compressible fluid-filled tubing to preserve hydraulic coupling.
- Keep the flush bag pressurised (≈300 mmHg) to prevent arterial blood entering the system.