CanadiEM Podcasts: CRACKCast, ClerkCast, CarmsCast, First Year Diaries CRACKCast E079 - Dysryhthmia
23 snips
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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Second-Degree AV Block
- Second-degree AV block Type 1 (Wenckebach) shows progressive PR lengthening until a dropped beat.
- Type 2 involves a block below the AV node with a normal PR interval but prolonged QRS.
High-Grade and Third-Degree AV Block
- High-grade AV block prevents appropriate ventricular rates and requires pacing, not atropine.
- Third-degree AV block shows complete AV dissociation, unlike less severe AV dissociation.
PACs vs. PVCs
- Premature atrial contractions (PACs) have a preceding P wave and a narrow QRS.
- Premature ventricular contractions (PVCs) lack a P wave and exhibit a wide, often bizarre QRS.
