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Antiarrhythmic Medications - Vaughan Williams Classification - Summary Table
Class I agents - Sodium Channel Blockers⠀
Class II
- Summary Table ... Sodium Channel Blockers ... blockers.⠀ Class ... Calcium Channels Blockers ... #Summary #Table
Summary of Heart Blocks
1st Degree Heart Block:
 • Prolonged PR >200ms (5 small squares).
 • Narrow
Heart Block: ... Mobitz I Heart Block ... Complete Heart Block ... • Block in AV ... narrow QRS • Block
Bradycardia Diagnostic and Management Algorithm

CONSIDER ETIOLOGY (not inclusive): 
 - STRUCTURAL: sick sinus, AV block, ischemia,
sick sinus, AV block ... Hypothyroidism - TOX: beta-blockers ... calcium channel blockers ... TREATMENT - Drugs (beta-blockers ... calcium channel blockers
Atrioventricular Blocks (AV blocks) - ECG Diagnosis Summary
First Degree AV Block
 • The P wave is
Diagnosis Summary ... First Degree AV Block ... Type I aka Mobitz ... electrocardiogram #classification ... #summary
Antiarrhythmics - Vaughan Williams Classification:
CLASS 1 - Sodium Channel Blockers:
 • MOA: Block fast Na+ channels
Sodium Channel Blockers ... : • MOA: Block ... : • MOA: Block ... primarily) and block ... : • MOA: Block
Mobitz Type I (Wenckebach Phenomenon) 2nd Degree AV Block on EKG
 • P-R interval gradually increases
Mobitz Type I (Wenckebach ... 2nd Degree AV Block ... till a dropped beat ... Second #Degree #AV #Block ... #AVBlock #diagnosis
Antihypertensive Drugs - Summary
Diuretics:
 • Thiazide type: Chlorothiazide, Hydrochlorothiazide
 • Thiazide-like: Chlorthalidone, Indapamide, Metolazone
 • Loop
: • Thiazide type ... Drugs: • β1 Blockers ... • Nonselective blocker ... Ca2+ Channel Blockers ... #table
Bradycardias Comparison Table
 - SINUS BRADYCARDIA 
 - JUNCTIONAL BRADYCARDIA 
 - 1st DEGREE AV BLOCK
Bradycardias Comparison Table ... 1st DEGREE AV BLOCK ... 2nd DEGREE AV BLOCK ... Type 1 and 2 - ... COMPLETE HEART BLOCK
Compelling and Possible Contraindications to Antihypertensive Drugs
Diuretics (thiazides)
 - Gout
 - Metabolic syndrome, Glucose intolerance, Pregnancy,
diltiazem) - AV block ... statins, digoxin) Beta ... , AV block (grade ... Depression, AV block ... contraindications #table
Antiarrhythmics Pharmacology Summary
Cardiac Conduction Phases:
Phase 0 - Ventricular Depolarization:
 • Na+ channels open leading to a
Antiarrhythmics Pharmacology Summary ... : • MOA: Block ... : • MOA: Block ... primarily) and block ... : • MOA: Block