CanadiEM Podcasts: CRACKCast, ClerkCast, CarmsCast, First Year Diaries CRACKCast E079 - Dysryhthmia
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May 23, 2017 Dive into the world of cardiac rhythms as the discussion unpacks ECG mysteries and the blood supply of the conduction system. Learn about the three mechanisms behind dysrhythmias and how conditions like AV nodal reentry tachycardia arise. The episode further breaks down antidysrhythmic drugs, their actions, and when to use digoxin. Explore various types of heart blocks, sick sinus syndrome, and intriguing concepts like Wolff-Parkinson-White syndrome, alongside essential management strategies for atrial fibrillation and tachycardias.
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Conduction System Blood Supply
- The SA node, located in the atria, typically sets the heart rate at 60-90 bpm.
- The AV node, usually supplied by the RCA, sets a heart rate of 45-60 bpm.
Dysrhythmia Mechanisms
- Dysrhythmias arise from enhanced automaticity, triggered activity, or re-entry.
- These mechanisms involve ectopic foci, delayed afterdepolarizations, or abnormal conduction circuits.
AVNRT Mechanism
- AV nodal re-entry tachycardia (AVNRT) requires two conduction pathways with different refractory periods.
- A unidirectional block in the slower pathway creates a self-sustaining electrical circuit.
