Source / episode info
- **Episode:**104
- **Title:**Divine Intervention Episode 104 – ACLS, Arrhythmias, and HY Cardiac Pharm
- **Published:**2019-05-23
- Source:Episode page
One-liner
This episode provides a comprehensive review of Advanced Cardiac Life Support (ACLS) protocols for various rhythms and details high-yield cardiac pharmacology, including antiarrhythmic drug classes, ACE inhibitor renal protection mechanisms, and the complex mechanism of digoxin toxicity.
High-yield summary
- V-fib/Pulseless VTach: This is a shockable rhythm requiring immediate defibrillation (unsynchronized cardioversion) every 2 minutes. The protocol involves CPR, rhythm check, shocking, and administering drugs (Epinephrine 1mg, then Amiodarone).
- PEA/Asystole: These are non-shockable rhythms managed by high-quality CPR and repeated administration of Epinephrine (1mg), with no need for defibrillation or antiarrhythmics like Amiodarone.
- Stable VTach: Managed primarily with IV medications (e.g., beta-blockers, non-dihydropyridine CCBs) to control rate/rhythm; synchronized cardioversion is reserved if the patient becomes unstable.
- ACE Inhibitors (ACEi): Used in heart failure and renal protection because they decrease Angiotensin II formation, thereby preventing excessive constriction of the efferent arteriole and reducing intraglomerular hypertension.
- Digoxin Toxicity: The mechanism involves Digoxin blocking the Na+/K+ ATPase pump; this leads to intracellular accumulation of sodium, which secondarily impairs the Na+/Ca exchanger, causing elevated cardiac calcium and increased contractility (and toxicity). Hypocalcemia increases susceptibility to digoxin toxicity.
Learning objectives
- Describe the systematic approach to ACLS management, differentiating between shockable (V-fib/VTach) and non-shockable rhythms (PEA/Asystole).
- Identify appropriate antiarrhythmic drugs based on rhythm stability and type of tachycardia (e.g., rate control vs. rhythm control).
- Explain the pathophysiology of ACE inhibitors in preventing renal damage by modulating efferent arteriolar tone.
- Detail the mechanism of digoxin toxicity, recognizing that hypocalcemia increases susceptibility to poisoning.
- Differentiate between synchronized cardioversion (for stable/unstable tachyarrhythmias) and unsynchronized defibrillation (for V-fib).
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