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cardiology diagnosis ekg ecg electrocardiogram clinical differential antiarrhythmics arrhythmia classes pathophysiology pharmacology sinus summary syncope tachycardia variants 3rd approach atrial
Summary of Heart Blocks 1st Degree Heart Block: • Prolonged PR >200ms (5 small squares). • Narrow
1st Degree Heart Block ... Mobitz I Heart Block ... Complete Heart Block ... • Block in AV ... HeartBlocks #Types #Classification
Atrioventricular Blocks (AV blocks) - ECG Diagnosis Summary First Degree AV Block • The P wave is
• PR interval ... There is constant PR ... by a junctional pacemaker ... an infra-Hisian pacemaker ... electrocardiogram #classification
Pacemaker Placement Indications Class I: • Third degree block • Advanced 2nd degree block • Symptomatic Mobitz
Pacemaker Placement ... • Third degree block ... or 3rd degree block ... Tri-fascicular block ... arrest, prolonged PR
Antiarrhythmics - Vaughan Williams Classification: CLASS 1 - Sodium Channel Blockers: • MOA: Block fast Na+ channels
Vaughan Williams Classification ... : • MOA: Block ... : • MOA: Block ... primarily) and block ... : • MOA: Block
Approach to ECGs - Tachy/Bradyarrhythmias Tachyarrhythmias - HR > 100 Wide (1) VT - DANGER (2)
- w/ variable block ... (3) SA node block ... rhythms (5) AV block ... - Proximal AV block ... QRS - Distal AV block
Antiarrhythmics Pharmacology Summary Cardiac Conduction Phases: Phase 0 - Ventricular Depolarization: • Na+ channels open leading to a
: • MOA: Block ... : • MOA: Block ... primarily) and block ... : • MOA: Block ... velocity) - ↑ PR
The 4 Variants of Sinus Arrhythmia Phasic Sinus Arrhythmia: • The rate increases with respiration and decreases
The P wave and PR ... presence of AV block ... Wandering Atrial Pacemaker ... several cycle the pacemaker ... variants #clinical #comparison
Third Degree AV Block aka Complete Heart Block • In sinus rhythm with complete AV block,
Third Degree AV Block ... Complete Heart Block ... with complete AV block ... • The PR interval ... by a junctional pacemaker
Approach to ECGs Check - Age, gender, name - 25mm/s; 10mm/mV - 1mm = 40ms; 0.1 mV Rate
Intervals - PR ... ) - HiPR: AV block ... ectopic atrial pacemaker ... leads rsr'), V-pacemaker
Syncope - Differential Diagnosis Algorithm Neurocardiogenic: • Vasovagal • Orthostatic Hypotension • Autonomic Neuropathy • Situational (micturition,
Differential Diagnosis Algorithm ... /3rd degree AV Block ... • Pacemaker ... Differential #Diagnosis #Algorithm
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