hocm: alcohol ablation or lvot surgery: when and what?...usually, asa... asa 1: „blind“ approach...
TRANSCRIPT
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HOCM: Alcohol ablation orLVOT Surgery: When and what?
Paul R Vogt/
Pascal A. BerdatCardiovascular Center Zurich
Clinic Im Park
Zurich
SKG/SGHC Annual Meeting,Zurich, 10.-12.6.15
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ASA/Myectomy: Common clinical indications
Marked LVOTO usually caused by SAM with a
gradient >50mmHg at rest or with physiological
exercise...
...responsible for progressive heart failure
symptoms...
...and functional limitation that affects quality of
life…
...in patients refractory to a variety of largely
negative inotropic drugs.
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ASA versus Myectomy
ASA better than the older, established and time-
proven Myectomy operation?
What does „better“ really mean?
Should ASA become the primary treatment
strategy with Myectomy as back-up if ASA fails?
Or does Myectomy remain the standard for most
patients with ASA serving as selective alternative?
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Usually, ASA... ASA 1:
„Blind“ approach without anatomical visualization
Restricted to the size and distribution of the septalperforator artery (10% of muscle mass; 30% of septum)
Fixed anatomic relationship to the target site of SAM-septal contact
Ineffective in substantial LV hypertrophy of more than 25mm wall thickness
Presence of intramyocardial scarring being potentially arrhythmogenic: CAVE in patients with pre-existing HCM-related sudden death risk markers! 2,3
Repeat intervention in up to 12% of patients associated with an increase in all-cause mortality 4,5
1. Maron BJ, Nishimura RA. Circ 2014;130:1617-24.2. Van der Lee C et al. Circ 2005;112:482-8.3. Cuoco FA et al. JACC 200852:17181-23.4. Agarwal S et al. JACC 2010: 55:823-34.5. Sorajja P et al. Circ 2012;126:2374-80.
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...whereas Myectomy...
More complete relief of LVOT gradient…1-3
...particularly in patients <65years of age 4
Appropriate for any degree of hypertrophy
Less residual gradients than after ASA
Reoperation extraordinarily rare after
Myectomy 2
However, it needs more than classical Morrow!
1. Van der Lee C et al. Circ 2005;112:482-8..2. Maron BJ et al. Circ 2007;116:196-206.3. Smedira NG et al. Ann Thorac Surg 2008;85:127-33.4. Sorajja P et al. Circ 2008;118:131-139.
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Goal of Surgery
Durable relief of obstruction
Restoration of Normal Mitral Valve function
Symptoms relief to NYHA I-II
Reduction of the Risk for Sudden Cardiac Death
Reduction of the Risk for Congestive Heart Failure
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The Surgeon’s Task
Recognize and Correct all morphologic abnormalities leading to obstruction...
… leading to SAM and Mitral Regurgitation...
Septal hypertrophy LVOT Midventricular (PM hypertrophy, muscle bundle) Fixed subaortic obstruction
Papillary muscle anomalies Accessory PM Anterior Displacement of APM
Pathologic chordae Attached to LV free wall, septum
Mitral valve anomalies Leaflet elongation
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To be resected 1: Echo guidance
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Morrow versus extended resection
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Surgery - Subvalvar Mobilisation
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Transaortic approach
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Jet lesions, fibrous endocardial tissue
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Volume of muscle resected
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HOCM and mitral valve
Usually Myectomy alone works
Concomitant mitral valve surgery rare:
Selective mitral valve plication
Anterior leaflet extension
Mitral valve replacement:
Not standard
Usually not indicated
Some say never to touch the mitral valve unless
there is associated organic mitral disease
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Operative Risks - Mortality
Current Operative Mortality is low!
Maron BJ et al. Circ 2007;116:196-206.
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Operative Risks - Complications
Woo et al. Circ 2005;111:2033-41.
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Long-term Effects - Survival
Survival after isolated Myectomy
Survival after Myectomy and Mitral Valve Surgery
Smedira NG et al. Ann Thorac Surg 2008;85:127-33.Kaple RK et al. Ann Thorac Surg 2008;85:1527-35.
1
2
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Survival Benefit for Myectomy
Myectomyfavorably alters the Natural Course of HOCM!
Provides for Normal or near Normal Life Expectancy!
Ommen et al. JACC 2005;46:470-6.Nagueh et al. Multicenter North America Registry. JACC 2011;58:2322-8.
ASA
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Long-term Effects - Hemodynamics
Long-term relief of
Septal Hypertrophy LVOT GradientSAM
Smedira NG et al. Ann Thorac Surg 2008;85:127-33.
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Qin et al. JACC 2001;38:1994-2000.
Long-term Effects - Symptoms relief
1. Minakata K et al. JTCVS 2004;127:481-9. 2. Van der Lee C et al. Circ 2003;108:2088-92.
2
1
98%
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Long-term Effects - Arrhythmias
Low need for PM
Decreases ICD discharge
Decreased Risk for SCD(?)
1. Smedira NG et al. Ann Thorac Surg 2008;85:127-33.2. Ommen SR et al. JACC 2005;46:470-6.3. McLeod CJ et al. Eur Heart J 2007;28:2583-8.
1 2
3
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3
Ommen SR et al. JACC 2005;46:470-6.
Heart Failure Benefit?
1. Maron MS et al. NEJM 2003;348:295-303.2. Woo A et al. Circ 2005;111:2033-41.
1
2
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Summary
Surgical treatment of HOCM offers
Consistent and Complete Hemodynamic Benefit
Consistent Restoration of functional capacity and QoL
Low operative risk: 0-2% mortality
Low rate of complications
Low rate of re-interventions
Myectomy appropriate for severe,
diffuse, mid-ventricular and even
apical types of HOCM
Surgical resection possible even
after unsuccessful ASA
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Does this presentation clarify „ASA versus Myectomy?“
NO!!
Adequately powered randomized study necessary to address relevant questions, requiring...
...35‘000 HCM patients being screened, including...
...500 patients in ASA and Myectomy arms...
...to compare primary clinical endpoints…
…additionally requiring years of follow-up…
Impractical even for major institutions dedicated to HOCM
interdisciplinary decision making…
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