an update of valvular heart disease, 2009 - … update of valvular heart disease, 2009 richard j....
TRANSCRIPT
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© 2007 PeaceHealth
An Update of
Valvular Heart Disease, 2009
Richard J. Leone, MD, PhD, FACS, FACCSt. Joseph
Cardiothoracic Surgery Associates
Bellingham, Washington
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Richard J. Leone, MD, PhD has no
commercial interest/conflicts
Images and video supplied by several
vendors will be included for
demonstration of new technology
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Overview
• History of Valve Development
• Applications of Current Valve Technology
• Current Recommendations for Valve
Replacement and Repair
• Future of Valvular Surgery
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HISTORY OF VALVE
DEVELOPMENT
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The Early 1900s: The Origins of Prosthetic Heart Valves
• A desire to alleviate valve stenosis and insufficiency was the primary impetus for heart valve technology development
• Stenosis was the primary pathology treated by cardiac surgeons
• Early efforts focused on alleviating symptoms of valve disease rather than valve replacement
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The 1920s:Mitral Valve Manipulation
• Once stenosis was realized to be a valvular disease, several physicians
performed mitral valve operations.
Dilating a Stenotic Valve with a Finger
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The 1920s: Mitral Valve Manipulation
• In 1929, J. H. Powers, M.D. demonstrated that mitral insufficiency was detrimental to hemodynamic flow.
• Research showed that patients treated with finger dilatation fared better than those who received valvotomy.
• Enthusiasm for valvular surgery diminished.
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The 1930s and 1940s:Improvement in Surgical Procedures
Advancements contributing to heart valve technology included:
– Hemodynamic data were obtained from patients with stenotic valves.
– Bernard Fantus, M.D. established the first blood bank in 1937.
– Heparin was refined so that it could be used as an anticoagulant.
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The 1950s: The First Prosthetic Heart Valves
Mechanical and tissue valves emerged
Mechanical valves:
– Were durable
– Required lifelong anticoagulant treatment
– Sometimes resulted in thrombosis
Tissue valves:
– Had limited durability
– Had relatively little thrombosis
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The 1950s: The Ball Valve
• Charles Hufnagel, M.D. implanted the first ball valve in 1952 to relieve a case of aortic insufficiency.
• He implanted the valve into the descending aorta to supplement the native valve.
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The 1950s: The Ball Valve
Blood Flow Through a Native Valve
Blood Flow Through a Ball Valve
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The 1950s: First Use of Cardiopulmonary Bypass
• John Gibbon, M.D. performed the first successful CPB procedure in 1953.
• Surgeons could see inside the heart clearly and operate for longer periods of time.
• Cardiac surgery was rejuvenated.
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The 1950s: Prosthetic Valve Development
Prosthetic valve development had to address three major issues:
– Hemodynamics—Determine the efficiency of a prosthetic valve
– Durability—Affected by the materials used for the prosthetic valve
– Thrombosis—Also affected by the materials used for the prosthetic valve
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The 1950s: First Successful Aortic Homograft
• Gordon Murray, M.D. completed the first successful aortic homograft implant
• He implanted the replacement valve into the descending thoracic aorta to supplement the native valve
• The patient enjoyed six years of satisfactory valve function
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The 1950s:Original Starr-Edwards Valve
The Starr-Edwards™
valve:
– Consisted of a rigid housing with a PTFE cloth sewing ring
– Had a poppet made of silicone rubber
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The 1950s: Current Starr-Edwards Valve
The current Starr-Edwards valve
A one-piece cage containing thin struts that meet at the apex.
A poppet made of silicone rubber with barium sulfate for visibility.
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The 1960s: Orthotopic Implants
• An orthotopic valve implant is placed at the same site as the valve it replaces
• The orthotopic implant was a milestone in heart valve technology because the patient depended on the prosthetic valve for survival
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The 1960s: Attempts to Refine the Ball Valve
Many physicians attempted to improve upon the ball valve, but they all ran into obstacles.
Experimental valves included:
– Polypropylene disc valve
– Helical spring valve
– Trileaflet synthetic valve
– Bicuspid cloth valve
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The 1960s: The Caged-Disc Valve
• The caged-disc valve was developed to improve on caged-ball valves.
• The poppet was replaced with a flat disc to reduce valve profile, but the cage continued to be an obstacle.
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The 1960s: The Tilting-Disc Valve
Blood Flow Through a Native Valve
Blood Flow Through a Tilting-Disc Valve
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The 1960s: Porcine and Bovine Pericardial Valves
Blood Flow Through a Bovine Pericardial Valve
Blood Flow Through a Native Valve
Blood Flow Through a Porcine Valve
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The 1960s: Porcine and Bovine Pericardial Valves
Advantages of porcine and bovine pericardial valves include:
– Obvious similarities to human heart valves
– Easily harvested
– Low rate of thrombosis and hemorrhage related to anticoagulants
The disadvantage of porcine and bovine pericardial
heart valves is limited durability
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The 1960s: Porcine and Bovine Pericardial Valves
Porcine and bovine pericardial valves:
– Cannot be transplanted in a fresh state
– Have to be preserved and treated with fixing agents to increase the stability of the tissues and decrease antigenicity
Formaldehyde was originally used to preserve tissue, but was later replaced with glutaraldehyde, with better performance
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The 1970s: The Hancock Standard Valve
• The Hancock® Standard valve was the first commercial porcine tissue valve.
• Concerns over high-pressure fixation and development of calcification emerged.
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The 1970s: First Bovine Pericardial Valve Replacement
Marian Ionescu, M.D. implanted the first bovine pericardial valve in 1971.
The valves were:
– Constructed from calf pericardium
– Fixed with glutaraldehyde
– Attached to a stent with sutures
Carpentier-Edwards
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The 1970s: Bovine Pericardial Valves
• Bovine pericardial valves gained in popularity in the late 1970s and early 1980s because they exhibited excellent hemodynamic properties and low rates of thromboembolism and endocarditis
• The use of pericardial valves declined when the higher likelihood of structural valve deterioration became apparent
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1970s: Improvements in Tilting-Disc Valves
• In the late 1970s, the Björk-Shiley valve was converted to a convex-concave shape.
• The valve was removed from the market after 400 cases of a broken outflow strut.
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1970s: Improvements in Tilting-Disc Valves
Medtronic Hall valve:
– Was introduced in 1977
– Was made from a single block of titanium
– Featured a pyrolytic carbon disc that rotated freely to wear evenly and create two blood flow channels
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Medtronic-Hall Mechanical Valve
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The 1970s: Bileaflet Valves
– Was introduced in 1977
– Was the first commercially successful bileaflet valve
– Features an occluder mechanism formed by two semicircular leaflets that cause three separate flow areas
The St. Jude Medical bileaflet valve:
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St. Jude Regent Valve
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The 1980s: Second-Generation Porcine Valves
Characteristics of 2nd-generation porcine valves include:
– Flexible stents—Improve blood flow
– Low-pressure fixation—Attempt to maintain more natural leaflet structure
– Anticalcification treatments—Prevent calcification
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The 1980s: Refinements to Prosthetic Heart Valves
• Mechanical and tissue valves developed on parallel tracks
• Most advances were a response to previous shortcomings
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Comparison of Cadaveric Homograft
and Porcine Valve Implants
The reduction in homograft implantation are due to:
– Little competition from porcine valves before 1965
– Reduced use of homografts once porcine valves became readily available
– CryoLife, Inc., with its inception in 1985, began to provide significant numbers of high-quality homografts and reawakened U.S. surgeons to the successful use of homografts
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The 1990s: Third-Generation Porcine Valves
The three major developments in third-generation porcine valves were:
– Physiologic pressure fixation
– Alpha amino-oleic acid, a new anticalcification agent
– Removal of the stent
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Evolution of Tissue Technologies:
Impact on Valve Performance
ThirdThirdSecondSecondFirstFirst
Mosaic®
Intact®
• High pressure fixation
• No anti-calcification
treatment
• Low/zero pressure fixation
• Toluidine Blue, T6
• Physiologic Fixation™
• AOA® treatment
Hancock® IIHancock® M.O.
Hancock Std.Freestyle®
Performance
GenerationGeneration
No clinical data are available which evaluate the long-term impact of AOA treatment and Physiologic Fixation in patients.
The Intact valve is not FDA approved and not available for sale in the U.S.
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The 1990s: Stentless Valves
• Removing the stent can result in improved hemodynamics
Medtronic Freestyle®
Stentless Valve
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The 1990s: Stentless Valves
Advantages of stentless valves include:
– Reduction in transvalvular pressure gradients with the removal of the stent and sewing ring
– Better distribution of mechanical stress
Disadvantages of stentless valves include:
– More difficult to implant than stented valves
– Additional physician training required
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Stentless Aortic Valve
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Stentless Aortic Valve
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APPLICATION OF CURRENT
VALVE TECHNOLOGY
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Normal Aortic Valve
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Aortic Stenosis
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Aortic Stenosis: Surgery vs No Surgery
Carabello BA: Clinical practice. Aortic stenosis. N Engl J Med 2002; 346:677
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Choice of Prosthesis
• Patient factors
• Patient age
• Comorbid conditions
• Technical aspects
– Calcified root
– Small aortic root
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Mechanical vs. Biologic
• Mechanical Valves
– Rare structural deterioration
– Patient compliance with Warfarin
– Anticoagulation risk of Warfarin
• 1-2% cumulative risk/year
• Biological Valves
– No long term warfarin required
– Risk of structural deterioration
– Risk of reoperation
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Median Life Expectancy After
Prosthetic Valve ReplacementIn Years by Age Group and Pathology
(Jones et al. Interaction of Age and Coronary Disease After Valve Replacement:
Implications for Valve Selection; Ann Thorac Surg; 1994: 58: 378-858)
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Risk Factors for Thromboembolism
• Atrial fibrillation
• Increased left ventricular cavity size
• Regional wall motion abnormality
• Depressed ejection fraction
• Hypercoagulability
• Increased age
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Additional Risk factors for
Thromboembolism
• Cancer
• Systemic infection
• Diabetes
• Prior event
• IgA against Chlamydia pneumoniae (CP)
• Eosinophilia
• Hypertension
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Risk Factors vs. Thromboembolic
Events
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* Effective below 2.5
Relationship Between INR and
Efficacy/Safety
• Low-intensity treatment:
– Efficacy rapidly diminishes below INR 2.0*
– No efficacy below INR 1.5
• High-intensity treatment:
– Safety compromised above INR 4
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Hylek, et al, studied the risk of intracranial hemorrhage in outpatients treated with
warfarin. They determined that an intensity of anticoagulation expressed as a
prothrombin time ratio (PTR) above 2.0 (roughly corresponding to an INR of 3.7 to
4.3) resulted in an increase in the risk of bleeding.
Adapted from: Hylek EM, Singer DE, Ann Int Med
1994;120:897-902
Risk of Intracranial Hemorrhage in
Outpatients
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INR below 2.0 results in a higher risk of
stroke
Lowest Effective Intensity for Warfarin
Therapy for Stroke Prevention in Atrial
Fibrillation
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Indication INRRange Target
Prophylaxis of venous thrombosis (high-risk surgery) 2.0–3.0 2.5
Treatment of venous thrombosis
Treatment of PE
Prevention of systemic embolism
Tissue heart valves
AMI (to prevent systemic embolism)
Valvular heart disease
Atrial fibrillation
Mechanical prosthetic valves (high risk) 2.5–3.5 3.0
Certain patients with thrombosis and the antiphospholipid syndrome
AMI (to prevent recurrent AMI)
Bileaflet mechanical valve in aortic position, NSR 2.0–3.0 2.5
Warfarin: Current Indications/Intensity
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ACC/AHA Guidelines for Postoperative
Anticoagulation
• Mechanical Valves
– Aortic - Warfarin INR 2.0-3.0 (Class I data)
– Mitral - Warfarin INR 2.5-3.5 (Class I data)
• Biological Valves
– Aortic - Aspirin (Class I)
– Mitral – Aspirin (Class I)
• High-risk pts benefit from Warfarin INR 2.0-3.0 (Class I)
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CURRENT
RECOMMENDATIONS FOR
VALVE REPLACEMENT AND
REPAIR
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American College of Cardiology/
American Heart Association
Guidelines for Patients with Valvular
Heart Disease
• Class I – Evidence for and/or general
agreement that treatment is beneficial,
useful and effective
• Class II – Conflicting Evidence
– IIa Weight of evidence is in favor
– IIb Efficacy is less well established
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ACC/AHA Guidelines Surgery for
Aortic Stenosis Class I
• Symptomatic patients with severe AS
(AVA <1.0cm, mean gradient >40 mmHg)
• Patients with severe AS undergoing other
heart surgery
• Patients with severe AS and LV
dysfunction (EF < 50)
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ACC/AHA Guidelines for Surgery for
Aortic Stenosis- Class IIb
• Severe AS w/ abnormal response to
exercise
• Severe asymptomatic AS w/ likelihood of
progressions or if surgery may be delayed
at symptom onset (eg. advanced age)
• Asymptomatic pts with very severe AS
(AVA <.6, gradient >60 mmHg)
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ACC/AHA Guidelines Surgery for
Aortic Regurgitation - Class I
• Symptomatic pts
• Asymptomatic pts with Severe AR and EF
<50
• Severe AR undergoing other heart surgery
• If undergoing Ascending Aorta
replacement
• Pts with severe AR and LV dilatation
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ACC/AHA Guidelines for Surgery for
Mitral Regurgitation
• Mitral Repair is indicated for most patients
with Severe MR and Any Symptoms
• Controversy exists with Asymptomatic
patients with Severe MR
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ACC/AHA Guidelines for Surgery for
Mitral Regurgitation – Class I
• Symptomatic pts with Severe MR
• Chronic Severe MR and NYHA Functional
Class II, III or IV symptoms
• Asymptomatic pts with Severe MR and EF
30-60%
• Mitral Repair is now recommended over
Replacement in majority of pts
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ACC/AHA Guidelines for Surgery for
Mitral Regurgitation – Class IIa
• MV Repair recommended in Experienced
Centers for Asymptomatic pts with
Chronic Severe MR and Normal (<60%) EF
• MV Repair for Chronic Severe MR and new
onset AF or Pulmonary Hypertension
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Mitral Valve Repair
• Mitral Valve was
traditionally
replaced
• Improved Survival
with Repair
• No need for
long-term
Anticoagulation
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Mitral Valve Repair
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© 2007 PeaceHealth Copyright ©2001 American Heart Association
Mohty, D. et al. Circulation 2001;104:I-1-I-7
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FUTURE OF VALVULAR
SURGERY
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Thoracic
Aortic
Aneurysms
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Thoracic Aortic Stent Graft
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Transcatheter Valves
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Transcatheter Valves
• Tremendous interest in transcatheter
valve therapy
• No current FDA Approval for transcatheter
valves in US
• Several platforms
• Reserved for highest-risk (nonsurgical)
patients
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Medtronic CoreValve
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Medtronic CoreValve Transcatheter
Valve
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Edwards Sapien Transcatheter Valve
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Transfemoral Insertion
• For patients without obstructive peripheral
vascular disease
• Need to negotiate the aortic arch
• Risks and benefits of valve surgery
without cardiopulmonary bypass
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Transfemoral
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Transapical Insertion
• Requires thoracotomy
• Very limited access to the heart but less
invasive
• Offers more accurate deployment of valve
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Transapical Valve
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Transcatheter Valvular Surgery
• Small series show promise
• Technical obstructions remain
– Proper sizing, valve durability
• FDA approval is currently pending in USA
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Transcatheter Mitral Surgery
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Transcatheter Mitral Clip
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Transcatheter Valvular Therapies
• May further less-invasive valvular repair in
the highest-risk patients
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