Percutaneous Transvenous Atrial Fibrillation Ablation and Stroke
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1 Percutaneous Transvenous Atrial Fibrillation Ablation and Stroke Vivek Y. Reddy, MD Helmsley Trust Professor of Medicine Director, Cardiac Arrhythmia Service The Mount Sinai Hospital
2 Disclosures Grant support and/or Consultant: ACT, Acutus Medical, Apama Medical, Biosense-Webster, Boston Scientific, Cardiofocus, Coherex, Endosense, Magnetecs, Medtronic, Philips, St Jude Medical, VytronUS I will be discussing off-label use of catheter ablation devices.
3 Paroxysmal AF: Catheter Ablation
4 Treatment success (%) Success of Catheter Ablation: Comparison to Medications Thermocool IDE Study STOP-AF Study days 63% CRYO 69.9% 114/163 17% P<0.001) Blanked DRUG Rx 7.3% 6/82 Wilber et al, JAMA, Days Packer et al, JACC, 2013
5 Role of Catheter Ablation: 2012 ESC/EHRA Guideline Update Camm et al Eur Heart J 2012; 33:2719.
6 Paroxysmal AF: Why does ablation fail?
7 3 mos 24 hrs Baseline Paroxysmal AF: Why does ablation fail? Red = DE-T1/scar Blue = T2/edema Arujuna A, et al: Circ Arry, 5:691 (2012)
8 How often does PV reconnection occur? The GAP-AF Trial PVI Group PV Isolation Paroxysmal AF EP Study (3 mo) Were PV isolated? Gap Group Allow PV Reconnection Outcome AF Recurrence at 90 days: PVI Group: 61.2%, p<0.001 Gap Group: 79.2% Patients with any PV reconnections at 3 months Gap Group: 89% PVI Group: 70% Breithardt G et al. Herz 33: , 2008 KHKuck et al. Presented at the German Cardiac Society, March 2013
9 Rate of Durable PVI in the Modern Era Methodological Changes we Instituted Catheter Stability: GA / JET Ventilation (Natale, Schwartzman, Marchlinski) Deflectable sheath to maximize tissue contact (Hindricks) Good Lesions : ICE Imaging of tissue contact (Marchlinski, Natale, Mangrum) How do these changes affect the durability of PVI?: Attention to impedance drop during ablation Examined our rate of PV reconnection in patients undergoing redo procedures after a first-ever ablation procedure Outcome: 93% of PV pairs remain isolated 86% of patients had all PVs isolated Circumferential tissue necrosis: PV isolation as ipsilateral vein pairs No Visual Gaps: Full encircling ablation despite PVI prior to encircling Contiguous lesions (Visually-Guided Laser, EFFICAS 1 & 2) Miller MA, Dukkipati S, Koruth J, d Avila A, Reddy VY AHA 2011 Minimize chance of dormant conduction: Longitudinal redundancy of the lesion set After PVI, additional ablation at sites of pace-capture (Michaud, Hindricks) Use Adenosine to identify dormant conduction (Arentz, Nattel) Use Isuprel to identify non-pv Triggers (Marchlinski, Natale)
10 How to improve AF ablation outcome? New Technology S.Dukkipati / P.Neuzil / A.d Avila / V.Reddy, Circulation Arrhy 3; (2010)
11 Persistent AF: Catheter Ablation
12 Persistent AF: Catheter Ablation Normal AF EGM: CFAE:
13 Persistent AF: Why does ablation fail?
14 Atypical Flutter: Multielectrode Mapping Patel & Reddy, Circ-Arry, 2008;1:14-22.
15 Ablation in Persistent AF: What is the future? Old Approach: CFAE Ablation Normal AF EGM: CFAE: New Approach: Identifying AF Rotors/Sources 1. FIRM: Focal Impulse and Rotor Modulation 2. Panoramic Body Surface Mapping
16 Case Example: 54y Pers AF despite prior extensive LA ablation RAA Courtesy: M.Haissagurre
17 So Ablation improves symptoms. Does ablation decrease stroke risk?
18 Stroke Risk After Catheter Ablation? 4,212 consecutive AF ablation pts 16,848 age/gender matched pts w/ AF 16,848 age/gender matched pts w/o AF AF + Ablation No AF AF Themistoclakis et al, JACC, 2010 Bunch et al, J Cardiovasc Electrophysiol 2011
19 Stroke Incidence After MAZE Buber,et al J Am Coll Cardiol 2011; 58:
20 Catheter Ablation as Stroke Prophylaxis? Guidelines 2006 ACC/AHA/ACC Guidelines 1. Warfarin is recommended for all patients for at least 2 months after an AF ablation procedure. 2. Decisions regarding the use of Warfarin more than 2 months after ablation should be based on the patient s risk factors for stroke and not on the presence or type of AF. 3. Discontinuation of Warfarin therapy post-ablation is generally not recommended in patients who have a CHADS 2 score /2012 ESC/EHRA Guidelines 2012 HRS/EHRA/ECAS Consensus Statement
21 Final Thoughts: Catheter Ablation Catheter Ablation of Paroxysmal AF Goal is permanent PV Isolation Catheter Ablation of Persistent AF Ideally, ablate while still paroxysmal Good outcome but with multiple procedures Catheter ablation of AF may be sufficient for stroke prevention in lower risk patients Long-term freedom from recurrent AF is not low enough in high-risk patients Need prospective randomized data!!!
22
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