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Antiarrhythmics Pharmacology Summary
Cardiac Conduction Phases:
Phase 0 - Ventricular Depolarization:
 • Na+ channels open leading to a
Blockers: • MOA: Block ... Blockers: • MOA: Block ... primarily) and block ... interval (delays time repolarization ... Blockers: • MOA: Block
Major electrocardiogram findings induced by left ventricular hypertrophy (LVH)
An increase in left ventricular mass augments the
Major electrocardiogram ... alteration in repolarization ... in left atrial depolarization ... Diagnosis #Cardiology #Electrocardiogram
Antiarrhythmics - Vaughan Williams Classification:
CLASS 1 - Sodium Channel Blockers:
 • MOA: Block fast Na+ channels
Blockers: • MOA: Block ... prolong AV node repolarization ... primarily) and block ... interval (delays time repolarization ... prolong AV node repolarization
Differences between Mobitz Type I and Type II Second-Degree AV Block

#Mobitz #Wenckebach #TypeI #TypeII #Type1 #Type2
Second-Degree AV Block ... #Type1 #Type2 #AVBlock ... Cardiology #Comparison #Electrocardiogram
Differential Diagnosis for ST Segment Elevations
 - ACUTE STEMI 
 - PULMONARY EMBOLISM 
 - LBBB
EMBOLISM - LBBB (PACEMAKER ... - BENIGN EARLY REPOLARIZATION
Comparison between Wandering atrial pacemaker (A) vs multifocal atrial arrhythmia (B)

#WAP #MAR #wandering #atrial #pacemaker #comparison
Wandering atrial pacemaker ... wandering #atrial #pacemaker ... diagnosis #ekg #ecg #electrocardiogram
Summary of Heart Blocks
1st Degree Heart Block:
 • Prolonged PR >200ms (5 small squares).
 • Narrow
1st Degree Heart Block ... Mobitz I Heart Block ... • Treatment: Pacemaker ... • Treatment: Pacemaker ... Diagnosis #EKG #electrocardiogram
Class I Antiarrhythmics and their Key Pharmacologic Properties

Class IA = Quinidine, Procainamide, Disopyramide ("Quarter PounDer")
Class IB
Fries Please") Block ... for the rapid depolarization ... • Slows depolarization ... involved in phase 3 repolarization ... • Prolongs repolarization
T Waves: Benign Early Repolarization vs Hyperacute T Waves vs Peaked T Waves 

BER = Notching
: Benign Early Repolarization ... EKG #cardiology #Electrocardiogram
Temporary / External Pacing
 • Transvenous & epicardial pacing are temporary methods of supporting brady- &
permanent implanted pacemaker ... required to trigger depolarization ... to identify a depolarization ... MD @nickmmark #pacemaker