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cardiology diagnosis differential ecg ekg electrocardiogram antiarrhythmics classes pathophysiology pharmacology summary atrioventricular blocks bradyarrhythmia bradycardia clinical degrees echocardiogram emergency heartblocks
Pacemaker Placement Indications Class I: • Third degree block • Advanced 2nd degree block • Symptomatic Mobitz
Pacemaker Placement ... with syncope • ... arrest, prolonged PR ... • Reversible causes ... BrighamMedRes #Pacemaker
Summary of Heart Blocks 1st Degree Heart Block: • Prolonged PR >200ms (5 small squares). • Narrow
• Prolonged PR ... • Prolonged PR ... • Treatment: Pacemaker ... • Treatment: Pacemaker ... HeartBlocks #Types #Classification
Shock - Differential Diagnosis by Classification Reflex Syncope - Vasovagal syncope • Prolonged standing
Differential Diagnosis by Classification ... bradycardia • Sinus pauses ... • AV block ... Differential #Diagnosis #Classification ... #Table #Causes
Syncope - Differential Diagnosis Algorithm Neurocardiogenic: • Vasovagal • Orthostatic Hypotension • Autonomic Neuropathy • Situational (micturition,
Syncope - Differential ... Diagnosis Algorithm ... /3rd degree AV Block ... • Pacemaker ... #causes
WOBBLER for ECG assessment in Syncope W - Wolff Parkinson White O - Obstructed AV
assessment in Syncope ... - Bifascicular block ... look for a short PR ... , can be caused ... characteristically cause
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
Approach to ECGs - Tachy/Bradyarrhythmias Tachyarrhythmias - HR > 100 Wide (1) VT - DANGER (2)
- w/ variable block ... 1º - long PR intervals ... 200ms from longer pause ... successively longer PR ... - ventricular pacemaker
Antiarrhythmics - Vaughan Williams Classification: CLASS 1 - Sodium Channel Blockers: • MOA: Block fast Na+ channels
Vaughan Williams Classification ... depolarization • ↑ PR ... velocity) - ↑ PR ... #Pharmacology #Classification ... #Classes #pathophysiology
Antiarrhythmics Pharmacology Summary Cardiac Conduction Phases: Phase 0 - Ventricular Depolarization: • Na+ channels open leading to a
Vaughan Williams Classification ... depolarization • ↑ PR ... velocity) - ↑ PR ... #Pharmacology #Classification ... #Classes #pathophysiology
Causes of Syncope - Differential Diagnosis Algorithm Cardiac - Arrhythmia: • Tachyarrhythmia • Bradyarrhythmia • Supraventricular Tachycardia
Causes of Syncope ... Differential Diagnosis Algorithm ... Atrioventricular Block ... Differential #Diagnosis #Algorithm ... #Causes
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