transcatheter mitral valve for fmr: the era of too many ......transcatheter mitral valve for fmr:...
TRANSCRIPT
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Transcatheter Mitral Valve for fMR: The Era of Too Many Options…
Isaac George, M.D.
Surgical Director, Structural Heart & Valve CenterAssistant Professor of SurgeryColumbia University Medical Center
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Within the past 12 months, I or my spouse/partner have had a financial interest/arrangement or affiliation with the organization(s) listed below.
• Honoraria/Consulting
• Steering Committee
• SAB
• Edwards, Medtronic, Gore Associates, Bolton
Affiliation/Financial Relationship Company
Disclosure Statement of Financial InterestIsaac George, MD
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Mitral Regurgitation (MR) occurs as a result Leaflet Malcoaptation
Primary Disorder of the Valve• Degenerative MR
- Flail, Prolapse• Rare disease
- endocarditis, rheumatic
Functional MR• Leaflets are normal• MR occurs due to LV
enlargement, annulardilatation etc
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Secondary MR (fMR)• Occurs when imbalance of the closing and the tethering forces of
the MV, annulus and LV wall• Due papillary muscle displacement from increased LV sphericity
or remodeling of LV wall (inferior, posterior), as well as annular dilatation (in SL dimension)
• MR occurs half the time after AMI
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Secondary mitral regurgitation:…a marker of a sicker LV
- or -…a contributor to a sicker LV?
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Secondary mitral regurgitation:…a marker of a sicker LV
- or -…a target for therapy?
Therapies that produce beneficial reverse remodeling also reduce severity of functional MR
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Surgery for secondary MR • Annuloplasty ring undersizing was mainstay of
repair (the Bolling effect)• Replacement• Edge-to-edge
• ?Ring: is it effective for primary disease process
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Repair vs Replacement for fMR
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Repair vs Replacement for fMR
• 58.8% recurrent moderate or greater MR with repair vs. 3.8% with replacement
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Should we replace all fMR valves?
• CTSN trial data suggests an unacceptably high rate of recurrent MR with MV repair
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Secondary mitral regurgitation can be repaired.But should it be repaired?
0
20
40
60
80
100
1 2 3 4 5 6 7 8
100
80
Surv
ival
(per
cent
)
60
40
20
0
p=NS
n=419
Medical
Surgical
5000 1000 1500 2000
Wu et al. J Am Coll Cardiol 2005;45:381-3872 DrSalvo et al. J Am Coll Cardiol 2010:55:272-82
Time (days)
There is no surgical data that shows a mortality benefit for MVR or MVr in secondary MR!2
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Secondary mitral regurgitation
class I
Guideline-directed medical therapy for heart failure, including CRT
class II
Mitral valve surgery is reasonable for patients with severe secondary MR (stage C and D) undergoing CABG or AVR
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Transcatheter Mitral Valve Replacement (TMVR)
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Basic Premise of Transcatheter Valve Therapy Development
Transcatheter devices mimic established surgical therapiesTherapies should demonstrate benefit (i.e.
lower or equivalent mortality and/or improved quality of life) when compared with “gold-standard” established therapies (presumably surgery)
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Transcatheter MV Implantation: Challenges• Fixation
– More complex structure– Asymmetric annulus– MAC– Coronaries
• Delivery– Catheter size– Approach (TA, TF, atrial)
• Seal– Paravalvular leak likely less well tolerated than with TAVR
(hemolysis)• Function
– LVOT obstruction risk– Need to preserve the subvalvular apparatus
• Valve– Thrombosis– durability
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Anchoring/Fixation
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Understand LVOT Risk
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TMVR – Early Pioneers
Edwards Fortis TMVR (TA) Neovasc Tiara TMVR (TA)
Edwards CardiAQ TMVR (TA/TS)
• ~20 patients treated• Trial stopped May 2015 due to
concerns about leaflet thrombosis
• 47 patients treated as of Dec ’17 (9.5% 30 day mortality)
• US trial paused• Tiara II trial ongoing (CE Mark
study with goal of 115 patients)
• US Feasibility trial initiated 2016• US trial paused and initiation of CE
mark trial delayed in Feb ‘17 for further design validation and testing
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Pitfalls in early feasibility trials
1. Very high screen failure rate - >50-90%1. Only 1 valve size 2. LVOT obstruction
2. Valve thrombosis3. Early and late death – non valve related4. Transapical access5. Hemodynamic instability immediately prior
to deployment
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Current Human Experience – Mid 2018
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Differentiated, dual stent design• Separates fixation & sealing from
valve function• Isolates valve from the dynamic
anatomy• Preserves native mitral apparatus• US Feasibility Trial Ongoing
Medtronic Intrepid TMVR
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Abbott Tendyne TMVR
Images Courtesy of Dr. Neil Moat
• Transapical deployment• Apical anchor ensures
stable deployment• US feasibility trial ongoing
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Caisson TMVR
• Transvenous, Transeptalapproach
• 2 step implant (anchor, valve)• Fully reversible• D-shaped Nitinol self-expanding
frame with porcine pericardial valve
PRELUDE: US Early Feasibility Study
Percutaneous Mitral Valve Replacement EvaLuationUtilizing IDE Early Feasibility Study (Initiated June 2016)
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Other TMVR Systems
• Low profile design• FIH case (Nov ‘15)
via transatrialapproach
Navigate TMVR• 2 component
system– Combined TF and TA
delivery
• FIH performed (Jan ‘16)
Highlife TMVR• Docking station • FIH performed with
Lotus (Oct ’15)
MValve System
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Other TMVR Systems
• Trileaflet pericardial• TA and TS approach• Leaflet capture
CardiaQ TMVR• D-shaped
monoleaflet• Asymmetric
ventricular profile
Epygon TMVR• Posterior valve• Keeps native AML
intact
Sutra Hemi-Valve
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TMVR Devices
Is there an EF cutoff?Will large bulky devices
adversely impact LV mechanics?LVOT obstruction – It’s not an all
or none phenomenonIs Transapical approach viable?Anticoagulation strategies?
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Transcatheter Mitral Valve Repair (TMVr)
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Advantages of TMV repair
1. More physiologic hemodynamics2. ? Easier for TS approach3. Less invasive4. Less risky5. Allows for future risk re-intervention
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Challenges of TMV repair
1. Significantly more complex2. Unknown benefit in secondary MR3. MR reduction less predictable4. Unknown durability5. Likely leaves residual MR
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Maisano. Zurich Valve, 2016
Coronary Sinus Remodeling
External compression
Direct Annuloplasty
SL dimension cinching
The many flavors of Repair
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Challenges with MitraClip
Anatomic limitations of the device MR reduction not completeFMR is a dynamic diseaseMedical optimization is hard
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TMVr: Annuloplasty
• Stand alone treatment for functional MR– Reduction annuloplasty
• Improve durability of mitral valve repair in primary MR– Annular stabilization
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Edwards Cardioband
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Nickenig.JACC Intv 2016
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Millipede IRIS System
Jason Rogers, TVT 2017
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Place Anchor Adjust
Millipede Implant
Jason Rogers, TVT 2017
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Transfemoral TransseptalComplete Ring
Jason Rogers, TVT 2017
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The ARTO System
• Immediate and Direct A-P Diameter Shortening to Treat FMR
• Venous Based Delivery Under choand Fluoroscopic Imaging
• Acutely Reversible or Removable• 12 Fr Delivery System• No residual ASD• Little Impact to Potential Future
Therapy
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MR Grade Reduction Maintained to 3 years (Phase I)
David Hildick-Smith TVT 2017
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Carillon Coronary Sinus AnnuloplastyPivotal CARILLON Trial Planned
Carillon + GDMT vs. GDMT in FMR
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The Ancora Heart Concept (Accucinch)
• Directly targets LV dysfunction and dilatation– Treat underlying cause of FMR
• Percutaneous trans-femoral arterial-retrograde technique– Not trans-septal or trans-apical
• Preserves the natural mitral structures
• Preserves all future treatment options
Sievert TCT 2017
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Edwards Pascal
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Has this gone too far?Atrial docking…
• AltaValve 4C
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AValve
• Conformational atrial cage for securing and anchoring• TA approach• ? Improve diastolic function
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Variety of Repair techniques
CARILLON Mitral Contour System
Mitral
Tricuspid
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Combination of Techniques
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Remaining Questions
• Is annuloplasty enough as a standalone therapy?
• How much reduction in MR needs to occur?• When should patients be treated (ERO 20, 40
or 60)?• Which therapy should be implemented first?• Can you leave moderate MR when the EF is
low?
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Where does this leave us?
Primary MR Secondary MR
Low Risk • Open Surgery • ? Surgery• Mitraclip?• TMVR?• TMV repair?
High Risk • Mitraclip• ?TMV repair
• OMT• Mitraclip?• TMVR?• TMV repair?
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TAVR Devices Approved in the US
TMVR ≠ TAVR
Indications for TreatmentComparator PopulationAnatomic Challenges
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Transcatheter Mitral Valve Treatment
• The field is in it’s infancy and many technical challenges remain
• Treatment paradigms for functional MR remain uncertain
• Trial designs for transcatheter devices unclear– MR etiology – Functional vs Degenerative– Control arm – Surgical vs Medical Therapy– Primary endpoint ?