Count to 10 - Anaesthetic Primary Podcast EP14 - Pacemaker AP vs Cardiac Myocyte AP | MiniPod | CT10
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Jun 19, 2023 Exploring the differences between pacemaker and cardiac myocyte action potentials, with a focus on ionic basis. Covering topics like SAQs, viva stems, and model answers. Discussing the role of potassium, calcium, and sodium channels in generating cardiac action potentials. Delving into the impact of anti-arrhythmic agents on heart action potential and their effects on ECG. Highlighting the importance of understanding drug effects on action potentials.
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Automaticity vs. Rhythmicity
- Automaticity is the heart's ability to generate its own beat.
- Rhythmicity is the regularity of pacemaker activity.
Potassium's Role in RMP
- Potassium is the most important ion for the resting membrane potential.
- This is due to its high permeability and the RMP's proximity to potassium's Nernst potential.
Cardiac Electrical Conduction
- Electrical activity in the heart originates in the SA node, travels through the atria, and then to the AV node.
- The AV node delays conduction, allowing atria to fill and empty before ventricular contraction.