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Bradycardia - Differential Diagnosis Framework and Management
Narrow Complex Bradycardia:
 • Regular: Sinus Bradycardia, AFib w/ AV
w/ AV Block, Atrial ... Tachy w/ AV Block ... AV Block, Mobitz ... II AV Block Wide ... SVT WI Wide QRS, Ventricular
Approach to ECGs - Tachy/Bradyarrhythmias
Tachyarrhythmias - HR > 100
Wide
  (1) VT - DANGER
  (2)
rhythms (5) AV ... QRS - Proximal AV ... block (lower AV ... block - ventricular ... #cardiology #differential
Arrhythmias - Differential Diagnosis Algorithm

Bradyarrhythmia (<60 bpm)
 • Sinus Bradycardia
 • Sick Sinus Syndrome
 • SA
AV Block (ISt ... /2nd /3rd degree ... interval) • AFib ... with Variable AV ... tachyarrhythmias #Cardiology
Syncope - Differential Diagnosis Algorithm
Neurocardiogenic:
 • Vasovagal
 • Orthostatic Hypotension
 • Autonomic Neuropathy
 • Situational (micturition,
Syncope - Differential ... • AFib/AFlutter ... Node) • 2nd/3rd ... degree AV Block ... Syndrome #Syncope #Cardiology
Tachyarrhythmia Framework - Differential Diagnosis
 • Narrow QRS - Regular Rhythm: Sinus tachycardia, AVNRT, Orthodromic AVRT,
AVNRT, Orthodromic AVRT ... flutter w/ variable AV ... , Antidromic AVRT ... with variable AV ... #Diagnosis #cardiology
Anatomical Differential Diagnosis for Arrhythmias
 • SA node: Sinus bradycardia, Sick Sinus Syndrome (SSS)
 • AV
Syndrome (SSS) • AV ... Tachycardia (MAT) • AV ... node: AV re-entrant ... tachycardia (AVRT ... ), AV nodal re-entrant
Hallmark ECG features of Ventricular Tachycardia (VT)
AV indicates atrioventricular; LAD, left axis deviation; LBBB, left bundle
ECG features of Ventricular ... Tachycardia (VT) AV ... #Ventricular #Tachycardia ... VTach #ECG #EKG #Electrocardiogram ... #Diagnosis #Cardiology
Classic Digoxin-Associated Arrhythmias
 • Atrial fibrillation with an unusually slow ventricular response
 • Atrial Fibrillation with
unusually slow ventricular ... Tachycardia with 2:1 AV ... Ventricular Tachycardia ... Arrhythmias #diagnosis #cardiology ... #ecg #ekg #electrocardiogram
Summary of Heart Blocks
1st Degree Heart Block:
 • Prolonged PR >200ms (5 small squares).
 • Narrow
Treatment: Pacemaker 3rd ... • Block in AV ... beyond AV node) ... Diagnosis #EKG #electrocardiogram ... #ecg #cardiology
Third Degree AV Block aka Complete Heart Block
 • In sinus rhythm with complete AV block,
Third Degree AV ... with complete AV ... junctional pacemaker (AV ... #ThirdDegree #3rd ... #cardiology #ekg