Mapping and Ablation of Challenging Outflow Tract VTs: Pulmonary Artery, LVOT, Epicardial

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1 Mapping and Ablation of Challenging Outflow Tract VTs: Pulmonary Artery, LVOT, Epicardial Samuel J. Asirvatham, MD Mayo Clinic Rochester California Heart Rhythm Symposium San Francisco, CA September 8, :45 PM Disclosure I receive royalties for work licensed through Mayo Clinic to a privately held company for contributions related to the use of nerve signal modulation to treat central, autonomic, and peripheral nervous system disorders, including pain. Mayo Clinic receives royalties and owns equity in this company. The company does not currently license or manufacture any drug or device in the medical field. Co-patent holder for technique to minimize coagulum formation during radiofrequency ablation Products or techniques related to the above disclosures are not being discussed in this presentation. Pertains to inventions/startup companies that include Nevro, Aegis, and the Phoenix Corp. Honoraria/Speakers: Consulting: Abiomed Sanofi Biotronik Stereotaxis Blackwell Futura Boston Scientific Medtronic Sanofi-aventis Spectranetics St. Jude Less difficult VT Ablation More difficult Right Ventricular Outflow Tract VT Outflow tract Fascicular Anatomic target Have to map LV ARVD Purkinje Mitral valve Scars System Valvar Reentry Sarcoid, etc Entrainment Imaging Lesion creation Electrophysiology Anatomy CP

2 Right Ventricular Outflow Tract VT (RVOT VT) Left bundle branch block, inferior axis Typically exercise provoked May be sustained or in salvos Prognosis generally excellent Some are sensitive to beta blockers or Ca channel blockers Mapping based on earliest activation 26 yrs female, 25,000 PVCs on Holter 3 failed ablations 3 Steps to Non Contact Map 1. Define Geometry 2. Record Map 3. Guide catheter to critical map site 2

3 3

4 RVOT LAD LCX Cardiac Vein LVOT retrograde approach LAO Normal Heart Direction of Great Arteries Pulmonary artery Ao RV PA LV Anterior View Anterior to aorta To left shoulder Ascending aorta Posterior to PA To right shoulder Aorta-PA angle 60 to 90 degrees Normal Heart Ventricles RVOT Ao LV LA Long-Axis View 4

5 Normal Heart Valves & Coronary Arteries RCC LCX LAD PV AV Conus RCA MV TV CS Cardiac Base PV Anteroseptal RVOT 5

6 6

7 Inlet-outlet ring around Right AV junction and Outflow tracts Left AV junction Dead-end tract Trabecular component of right ventricle Left ventricle Primary septum Compact node Penetrating bundle Dead-end tract Ventricular bundle branches on apical trabecular septum AV grove AV Right grove ventricle Branching bundle and bundle branches CP lead ECG 7

8 RVOT Anatomy LPO Lasso at aortic Sinus of Valsava Lasso in aortic-root I V1 V2 Normal Heart External Topography LAA RAA Superior View CP

9 Srivathsan K, AS G, Ackerman M, Asirvatham S: Treatment of ventricular fibrillation in a patient with prior diagnosis of long QT syndrome: importance of precise electrophysiologic diagnosis to successfully ablate the trigger.. Heart Rhythm 2007; 4: Srivathsan K, AS G, Ackerman M, Asirvatham S: Treatment of ventricular fibrillation in a patient with prior diagnosis of long QT syndrome: importance of precise electrophysiologic diagnosis to successfully ablate the trigger. Heart Rhythm 2007; 4: Liu XK, Barrett R, Packer DL, Asirvatham SJ: Successful management of recurrent ventricular tachycardia by electrical isolation of anterolateral papillary muscle. Heart Rhythm 2008; 5:

10 Imaging and Epicardial Procedures T2 T3 T4 Courtesy of Dr. Michael Ackerman Figure 1A Left Ventricle, Epicardium, Acetone, LabVision (Kit) 10

11 External Cardiac Anatomy Pericardium Illustration (CIBA) Heart Removed VT in the Normal Heart 1. Right ventricular dysplasia 2. Sarcoidosis 3. Cardiomyopathy, not tachycardia related 4. Coronary vascular malformation 5. Mitral valve prolapse 6. False tendon/moderator band 7. Non-compact myocardium 8. Atypical ventricular dysplasia pattern 11

12 Perfusion Delayed Enhancement Ventricular Tachycardia Ablation in the Normal Heart Outflow tract VT Appreciating the relative anatomy Clinical arrhythmia syndromes Causes of difficulty with ablation Cuspal tachycardias VT Atrial arrhythmias Accessories pathways Investigating potential structural causes Dysplasia Coronary malformations Remnant fascicles Mapping and Ablation of Challenging Outflow Tract VTs: Pulmonary Artery, LVOT, Epicardial Samuel J. Asirvatham, MD Mayo Clinic Rochester California Heart Rhythm Symposium San Francisco, CA September 8, :45 PM 12

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