13 results
Stimulated
SA node
AV node -
Un-stimulated
#PQ
(mV) 0
ECG (lead II)
QRS
#QRS
#SA node
#AV node
#Bundle of His
Bundle branches
#Purkinje fibers
#QRS
#ST
Stimulated SA node ... AV node - Un-stimulated ... #PQ (mV) 0 ECG ... ) QRS #QRS #SA ... node #AV node
Supraventricular Tachycardias - Pathophysiology
Conduction pathways through SA Node, Atrium, AV Node, Bundle of His, and Ventricle
Pathophysiology Conduction ... pathways through ... SA Node, Atrium ... diagnosis #cardiology #conduction ... #pathways #avnrt
Cardiac conducting system 
 - Sinoatrial (SA) node normally generates the action potential, i.e. the electrical
Cardiac conducting ... - Sinoatrial (SA ... - The SA node ... - From the AV ... #Pathways
Anatomical Differential Diagnosis for Arrhythmias
 • SA node: Sinus bradycardia, Sick Sinus Syndrome (SSS)
 • AV
Arrhythmias • SA ... Syndrome (SSS) • AV ... escape rhythm, Conduction ... His-purkinje system: Conduction ... > 100 bpm) • SA
Arrhythmias - Differential Diagnosis Algorithm

Bradyarrhythmia (<60 bpm)
 • Sinus Bradycardia
 • Sick Sinus Syndrome
 • SA
Differential Diagnosis Algorithm ... Sinus Syndrome • SA ... Block • AV Block ... with Variable AV ... Differential #Diagnosis #Algorithm
Visual Guide to AV Nodal Reentrant Tachycardia (AVNRT) - Pathophysiology
 - Dual AV nodal physiology is
Visual Guide to AV ... Pathophysiology - Dual AV ... - Normal conduction ... stays inside the AV ... Visualmedapp #AV
Antiarrhythmics - Vaughan Williams Classification:
CLASS 1 - Sodium Channel Blockers:
 • MOA: Block fast Na+ channels
reduce speed of ion conduction ... current) causing ↓SA ... node and AV node ... interval to prolong AV ... to ↑ ERP (slow conduction
Causes of Tachycardia - Differential Diagnosis Algorithm
Narrow Complex - Regular:
 • Sinus tachycardia
 • Atrial flutter
Differential Diagnosis Algorithm ... Atrial flutter • AV ... tachycardia • AV ... with variable conduction ... Differential #Diagnosis #Algorithm
Antiarrhythmics Pharmacology Summary
Cardiac Conduction Phases:
Phase 0 - Ventricular Depolarization:
 • Na+ channels open leading to a
Summary Cardiac Conduction ... current) causing ↓SA ... node and AV node ... interval to prolong AV ... interval to prolong AV
Syncope - Differential Diagnosis Algorithm
Neurocardiogenic:
 • Vasovagal
 • Orthostatic Hypotension
 • Autonomic Neuropathy
 • Situational (micturition,
Differential Diagnosis Algorithm ... Sinus Syndrome (SA ... 2nd/3rd degree AV ... Differential #Diagnosis #Algorithm