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Supraventricular Tachycardias - Pathophysiology Conduction pathways through SA Node, Atrium, AV Node, Bundle of His, and Ventricle
Pathophysiology Conduction ... pathways through SA ... diagnosis #cardiology #conduction
Cardiac conducting system - Sinoatrial (SA) node normally generates the action potential, i.e. the electrical
Cardiac conducting ... - Sinoatrial (SA ... - The SA node ... Cardiac #Heart #Conduction
Anatomical Differential Diagnosis for Arrhythmias • SA node: Sinus bradycardia, Sick Sinus Syndrome (SSS) • AV
Arrhythmias • SA ... escape rhythm, Conduction ... His-purkinje system: Conduction ... > 100 bpm) • SA
Arrhythmias - Differential Diagnosis Algorithm Bradyarrhythmia (<60 bpm) • Sinus Bradycardia • Sick Sinus Syndrome • SA
Sinus Syndrome • SA ... with Variable AV Conduction ... rhythm SVT with conduction ... rhythm SVT with conduction
Antiarrhythmics - Vaughan Williams Classification: CLASS 1 - Sodium Channel Blockers: • MOA: Block fast Na+ channels
reduce speed of ion conduction ... current) causing ↓SA ... to ↑ ERP (slow conduction
Antiarrhythmics Pharmacology Summary Cardiac Conduction Phases: Phase 0 - Ventricular Depolarization: • Na+ channels open leading to a
Summary Cardiac Conduction ... reduce speed of ion conduction ... current) causing ↓SA ... to ↑ ERP (slow conduction
Conductive vs Sensorineural Hearing Loss on Physical Exam Weber Test: • Normal: Sound is equal bilaterally •
Conductive vs Sensorineural ... bilaterally • Conductive ... • Normal: Air conduction ... • Conductive: ... Bone conduction
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 ... ) QRS #QRS #SA
Atrioventricular (AV) Blocks First Degree AV Block - "If your R is far from your P than
degree" • 1:1 conduction ... Block: Delayed conduction ... Less than 1:1 AV conduction ... Block: Slowed conduction ... Block: Slowed conduction
Approach to ECGs - Tachy/Bradyarrhythmias Tachyarrhythmias - HR > 100 Wide (1) VT - DANGER (2)
tachy not from SA ... /brady) (3) SA ... escaped beats (4) SA
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