12 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 #SA node ... #AV node #Bundle
Supraventricular Tachycardias - Pathophysiology
Conduction pathways through SA Node, Atrium, AV Node, Bundle of His, and Ventricle
Pathophysiology Conduction pathways ... through SA Node ... , Atrium, AV Node ... Tachycardia • AV ... cardiology #conduction #pathways
Approach to ECGs - Tachy/Bradyarrhythmias
Tachyarrhythmias - HR > 100
Wide
  (1) VT - DANGER
  (2)
tachy not from SA ... /brady) (3) SA ... running through QRS ... DANGER Narrow QRS ... function) Wide QRS
Cardiac conducting system 
 - Sinoatrial (SA) node normally generates the action potential, i.e. the electrical
- Sinoatrial (SA ... - The SA node ... through internodal pathways ... atrioventricular (AV ... - From the AV
Visual Guide to AV Nodal Reentrant Tachycardia (AVNRT) - Pathophysiology
 - Dual AV nodal physiology is
Visual Guide to AV ... Pathophysiology - Dual AV ... stays inside the AV ... hidden in the QRS ... seen after the QRS
Causes of Tachycardia - Differential Diagnosis Algorithm
Narrow Complex - Regular:
 • Sinus tachycardia
 • Atrial flutter
Differential Diagnosis Algorithm ... Atrial flutter • AV ... tachycardia • AV ... SVT with wide QRS ... SVT with wide QRS
VT versus SVT with Aberration - Interpretation Cheat Sheet

Features favouring VT
● Absence of typical RBBB or
morphology ● AV ... dissociation (P and QRS ... entirely negative (QS ... Brugada algorithm ... AV dissociation
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
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
Algorithm for the Evaluation of Regular, Wide-Complex Tachycardia
1. aVR: Is the initial deflection in aVR positive?
Algorithm for the ... AV Dissociation: ... there evidence of AV ... morphology: Is the QRS