Case-Based Practical ECG Interpretation for the Generalist
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1 Case-Based Practical ECG Interpretation for the Generalist Paul D. Varosy, MD, FACC, FAHA, FHRS Director of Cardiac Electrophysiology VA Eastern Colorado Health Care System Associate Professor of Medicine University of Colorado, Denver
2 Disclosures None
3 Overview ECG Basics Methodological Approach to Reading ECGs Differentiation of Supraventricular Arrhythmias SVT classification Atrial Fibrillation vs. Atrial Flutter WPW Syndrome Recognition and management of a long QT interval Review
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7 RA LA LL
8 RA I LA LL
9 RA I LA II LL
10 RA I LA II III LL
11 RA I LA avr II III LL
12 RA I LA avr avl II III LL
13 RA I LA avr avl II avf III LL
14 RA I LA avr avl II avf III Einthoven s Triangle LL
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18 The Modern 12-Lead ECG
19 The Modern 12-Lead ECG One of the quintessential tools of Cardiology
20 Approach to the 12-Lead ECG Rate Rhythm Intervals Axis QRS Morphology (Infarction, Hypertrophy) ST Segment and T Waves
21 Measuring ECG Intervals At 25 mm/sec paper speed: Large boxes are 0.2 sec (200 msec) Small boxes are 0.04 sec (40 msec)
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27 Supraventricular Tachycardia (SVT) SVT is common Prevalence of ~1/500 Incidence of ~90,000 new cases per year AVNRT accounts for 50-60% of all SVT Dual AV Node Physiology Present in as many as 30-40% Only a small percentage have clinical SVT
28 SVT: Differential Diagnosis Sinus tachycardia Atrial tachycardia Atrial flutter Atrioventricular nodal reentrant tachycardia (AVNRT) Orthodromic atrioventricular reentrant tachycardia (AVRT) Junctional tachycardia Paroxysmal form of junctional reciprocating tachycardia (PJRT)
29 Subcategorizing SVT: P wave No P or P-in-QRS Short RP Long RP
30 Subcategorizing SVT: P wave No P or P-in-QRS Short RP Long RP Helps to focus the differential diagnosis!!
31 No P or P in QRS R R
32 No P or P in QRS Differential diagnosis: AVNRT Atrial flutter AT with 1 st degree AV block JT Much less likely AVRT
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35 AVNRT: Atrioventricular Nodal Reentrant Tachycardia
36 Short RP R P R RP interval
37 Short RP Differential diagnosis: AVRT AVNRT AT with 1 st degree AV conduction delay JT
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40 AVRT: Atrioventricular Reentrant Tachycardia.
41 Long RP R P R RP interval
42 Long RP Differential diagnosis: Sinus tachycardia Atrial tachycardia AVNRT (atypical form) Junctional tachycardia AVRT
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44 Atrial Tachycardia Focal arrhythmia arising in either right or left atrium Several arrhythmia mechanisms are possible Automatic Triggered Micro-reentrant Most common site is the right atrial crista terminalis near the sinus node
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46 Differentiating Atrial Fibrillation from Flutter Atrial Fibrillation Disorganized atrial activity Irregularly-irregular ventricular response Atrial Flutter Organized atrial activity intraatrial macro-reentry Often regular rapid ventricular response (2:1 conduction ~150 bpm)
47 Differentiating Atrial Fibrillation from Flutter Atrial Fibrillation Rate control generally possible Ablation is sometimes successful (improves symptoms in 50-60%) Moderate risk of complications (5-10%) Atrial Flutter Rate is difficult to control Ablation is highly successful (>95% cure) Ablation is low risk (<2%)
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53 Case 1 30 yo man awoke on a Saturday morning with sudden onset palpitations, dyspnea, and presyncope. This episode followed an evening of drinking substantially more than usual with friends. No known medical problems. Came to the ED for medical attention.
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56 Case 1 30 yo man awakened with palpitations, dyspnea, and presyncope Tachycardic, irregular, but otherwise normal exam Abnormal ECG Normal Echocardiogram
57 Case 1 30 yo man awakened with palpitations, dyspnea, and presyncope Wolff-Parkinson-White Syndrome with preexcited atrial fibrillation
58 Accessory Pathway
59 Wolff-Parkinson-White Syndrome Sinus ECG shows evidence of pre-excitation Typical episodes of tachycardia Orthodromic AVRT Antidromic AVRT SVT with pre-excitation (most commonly atrial fibrillation with pre-excitation)
60 Tachycardias with Accessory Pathways Atrioventricular Reentrant Tachycardia (AVRT) A reentrant arrhythmia involving Atrium AV Node/His-Purkinje system Ventricle Accessory Pathway Orthodromic: down the conduction system (Narrow complex) Antidromic: (Wide complex) SVT with pre-excitation up the conduction system
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63 Treatment of Accessory Pathway- Mediated Tachycardias Medical: AVRT: AV nodal blockers (adenosine, etc) Atrial fibrillation with pre-excitation: NO AV BLOCKERS: Risk of V Fib!!! Procainamide slows conduction in pathway Electrical: cardioversion if unstable Radiofrequency ablation Almost always curative!
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66 Case 1 30 yo man awakened with palpitations, dyspnea, and presyncope Underwent successful RF catheter ablation of a posteroseptal accessory pathway
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68 Case 2 60 yo man with multiple episodes of syncope, all occurring in the setting of urination. Katz JAMA Internal Med 2013;173:
69 Case 2 60 yo man with multiple episodes of syncope, all occurring in the setting of urination. He has a history of IV drug use currently in remission on methadone therapy. Katz JAMA Internal Med 2013;173:
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71 ECG Recognition of a prolonged QT Interval All 12 leads can be used, V2 and V3 may be best to exclude U waves Rule of thumb: If the QT interval is more than half the RR, it s probably too long QT correction several approaches to account for changes with HR Bazett QTc = QT RR Fridericia Nomogram
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73 Acquired Long QT Prolonged QTc found in up to 1% of hospitalized patients Risk Factors: Electrolyte disturbances (K, Mg, Ca) Hypothyroidism Anorexia Bradycardia Structural heart issues (LVH, reduced LVEF) Medications (antiarrhythmics, psychotropic drugs, antibiotics, etc.)
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75 Case 3 19 yo woman with palpitations and lightheadedness. Her mother died suddenly at age 25.
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78 Congenital Long QT Syndrome Much less common than acquired QT prolongation 1/2000 Clinical syndromes: Romano-Ward (Autosomal dominant, cardiac only) Jervell and Lange-Nielsen (Autosomal recessive, sensorineural deafness) 300+ mutations in ~20 genes identified Phenotypes LQT1 events with exercise (especially swimming) (35%) LQT2 events with auditory stimuli (25%) LQT2 and LQT3 events during sleep (10%)
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83 Congenital Long QT Syndrome - Management Avoid exacerbating factors (medications, etc.) Beta Blockers (especially LQT1) propranolol, nadolol preferred Pacing and/or ICD if symptoms/events on beta blocker Sports debate about restriction
84 Review ECG Basics Methodological Approach to Reading ECGs Differentiation of Supraventricular Arrhythmias SVT classification Atrial Fibrillation vs. Atrial Flutter WPW Syndrome Recognition and management of a long QT interval Review
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