Mechanical Circulatory Support - OSU Center for Continuing ... · Left ventricular assist device...
Transcript of Mechanical Circulatory Support - OSU Center for Continuing ... · Left ventricular assist device...
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Orlando, Florida – October 7-9, 2011
Management of Advanced Congestive Heart Failure
Mechanical Circulatory Support
Robert S. D. Higgins, MD, MSHAProfessor and Chief, Cardiac Surgery
The Ohio State University Medical Center
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Mechanical Circulatory Support Program Mission
Patient Care
ResearchEducation
To enhance and extend the quality of life in patients with end stage heart
disease requiring advanced cardiopulmonary mechanical support through a commitment to research,
education, and above all clinical excellence.
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Congestive Heart Failure
Epidemiology5 million Americans,10 million worldwide500,000 to 1 million new cases diagnosed yearly70% of men, 79% of women with CHF have history of hypertensionHuge economic impact in diagnosis, treatment, including AICD ,Bi Ventricular pacing, transplant/LVADs
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Some Things Pills Cannot Fix
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Which device for what indication?
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Mechanical Circulatory Support
Types of support
Acute cardiogenic shock, heart failureCardiac arrestAMI post-cardiotomy shockcath lab cardiac arrest
Chronic heart failure
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Criteria for Mechanical Support
Failure to wean inotropesEnd-organ damage
NauseaDecreased mental statusProgressive renal or hepatic failureWorsening arrhythmias
J Thorac Cardiovasc Surg 1977; 74: 709-720
Cardiac Index < 2.0 L/min/m2PCWP > 20 mmHgSVR > 2,100 dynes/s/cm3Urine output < 20 ml/hrSBP < 80 mmHg
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Contraindications for VAD Support
Major irreversible neurologic deficitsHepatic fibrosis or cirrhosisNonreversible end-organ dysfunctionNon-correctable intra-cardiac shuntsActive infection?
Mechanical ventilation & FIO2 > 70%Morbid Obesity (BMI >40)PregnancyPrevious Heart TransplantPsychosocial dysfunction
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Types of Mechanical Circulatory Support
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ACUTE CIRCULATORY FAILURE IN CHRONIC CHF
IABPECMOABIOMED BVS/AB VentricleTHORATEC CentriMagImpella
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Hemodynamic Issues
Pre-load dependentIndependent of cardiac cycleLeft ventricular assist device requires adequate RV function
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Myocardial Recovery and Weaning
Allow time for ATP stores to return!Average minimum of 3 days of ventricular decompression and end organ perfusion before weaning.TEE recommended Q24 hours and to assess wall motion while weaning.Average recovery occurs in 3-6 days.
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Helicopter Transport
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Durable Mechanical Circulatory Support
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Durable mechanical circulatory support Left Ventricular Assist Device
Left ventricular assist device (LVAD) is a electric or battery-operated, mechanical pump-type device that's surgically implanted. It helps maintain the pumping ability of a heart that can't effectively work on its own. Right ventricular assist device (RVAD) can also support right side of heart (usually short-term, temporary)
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Difficult decisions of end stage heart failure: Mechanical Circulatory Support
A balance:The risks of multi-system
organ failure fromprogressive heart failure(> 50% death in 1 year)
The risks ofsurgical intervention
for MCSD andongoing MCSD support
versus
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Device Strategy
• Bridge to Recovery
• Bridge to Transplant
• Destination Therapy
INTERMACS: Patient Selection
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Bridge to transplant (BTT) Recipient selection criteria for ventricular assist device
Accepted as candidate for cardiac transplantationAbsence of coagulopathy or gastrointestinal hemorrhageVentricular failure (CI <1.8 L/min/m2, left atrial pressure >25 mmHg, systolic blood pressure <90 mmHg), despite:
Corrected metabolism (temperature, acid-base, electrolytes)Adequate preload, appropriate afterload reductionMaximal inotropic supportIntra-aortic balloon pump assistance
CARDIAC SURGERY in the ADULT. Cohn LH, Edmunds LH Jr., eds. New York: McGraw-Hill, 2003.
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Preoperative risk scale for left ventricular assist device placement
Criteria Points
Urine output <30 cc/h 3
Intubated 2
Prothrombin time >16 sec 2
Central venous pressure >16 mm Hg 2
Reoperation 1
* A combined score of >5 is associated with a 70% mortality risk.
CARDIAC SURGERY in the ADULT. Cohn LH, Edmunds LH Jr., eds. New York: McGraw-Hill, 2003.
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Stratum C Case – Preoperative MRI
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VADs that Deliver a Pulse
Abiomed BVS 5000 (short-term)
Abiomed Ventricles (short-term)
Heartmate XVE (long term)
Thoratec IVAD (long-term)
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VADs that deliver Continuous Flow (No-Pulse)
Heartmate II (long-term) Heartware (long-term) *investigational
Ventrassist (long-term) *investigational
Centrimag (short-term)
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Heartmate XVE
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HeartMate® VE
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REMATCHRandomized Evaluation of Mechanical Assistance for the
Treatment of Congestive Heart FailureProspective Randomized evaluation of LVAD’s vs. medical therapy in patients with CHF who are not transplant candidatesStudy period – May 1998 – July 2001, 20 transplant centers129 patients enrolled
68 received (avg. age 68 yrs) VE LVAD (Heartmate)61 patients (avg. age 66 yrs) received optimal medical Rx
End points included survival, quality of life, complications, device malfunctions
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REMATCH 100
80
60
40
20
0
Sur
viva
l (%
)
0 6 12 18 24 30
Months
LV Assist Device
Medical Therapy
Rose E NEJM 2001
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“In the Future We Need a LV Assist Device that Lasts Longer than Two Years”
Dr Bruce LytleCleveland Clinic 2006
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Next Generation LVADs
Smaller, easier implantBridge to recovery possibility, destination applicationStill requires aggressive anticoagulationPump (Blood) flow estimation based upon pump speed/powerPre-load dependent, after-load sensitiveVariable adaptability to changes in patients physical demands
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Mechanical Circulatory Support
“The Future is Now”
2nd Generation-Axial flow LVAD’s
3rd Generation- Rotary flow pumps
Total Artificial Heart
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Thoratec Heartmate II
Continuous, axial flow LVAD approved as BTT 2005 (CE Mark)FDA approval as BTT/DT 2008Clinical experience >700 implants worldwide79% patients survive to transplant, recovery or ongoing support as DT mean support 169 daysRequires aggressive anticoagulation
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Third Generation VADs
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Heartware
Miniature Implantable LVADBlood lubricatedIn US feasability trials
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Hemodynamic Targets
Adequate systemic perfusionEstimated LVAD flow 4.5–6 L/minDoppler MAP 70–95 mmHgCVP 10–15 mmHg
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What Happens?(Outcomes after Implant)
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OSU Durable LVAD case VolumeJanuary 2008 – December 2010
125 Total devices implanted into 112 unique patients2008
38 Implants
200940 Implants
201047 Implants
Source: PATS Axis Software VAD Database
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Mechanical Circulatory Support
Major Perioperative Challenges
Post-operative bleeding
Right ventricular dysfunction
Infections
Anti-thrombotic therapy/bleeding complications
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TOP SIX LVAD ISSUES THAT YOU MAY ENCOUNTER with VAD Patients after discharge
6. Arrhythmia5. Hemolysis4. Renal Failure3. Infection2. Volume overload: CHF, Right Heart Failure
1. GI Bleeding
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HeartMate XVE Driveline Exit site
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Dressing Change Policy
Every other daySterile techniqueChloraprep/Alcohol cleaning solutionNO BETADINEPatients should wear binder to protect and secure the driveline
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INTERMACS Database
Data Submission Requirement of VAD Programs
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PROFILE-LEVEL # PtsYr 1
Official Shorthand General time frame for support
INTERMACSLEVEL 1
82 “Crash and burn” Hours
INTERMACSLEVEL 2
81 “Sliding fast” Days to week
INTERMACSLEVEL 3
18 Stable but Dependent Weeks
INTERMACSLEVEL 4
9 “Frequent flyer” Weeks to few months, if baseline restored
INTERMACSLEVEL 5
4 “Housebound” Weeks to months
INTERMACSLEVEL 6
3 “Walking wounded” Months, if nutrition and activity maintained
INTERMACSLEVEL 7
4 Advanced Class III
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Implant Dates: Jun 23, 2006 – Dec 31, 2007
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
Level 1 Level 2 Level 3 Level 4 Level 5,6,7
Patient Profile Levels
% B
i-VA
D o
r TA
HDevice Support by Patient Profile
P(comparing distribution) = 0.004
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0.00.10.20.30.40.50.60.70.80.91.0
0 1 2 3 4 5 6 7 8 9 10 11 12Months after Device Implant
Prop
ortio
n of
pat
ient
s
Recovery 5%
Alive 26%
Dead 29%
Transplanted 40%
5%
16%
32%
47%
Implant Dates: Jun 23, 2006 – Dec 31, 2007
Competing Outcomes – Level 1: Critical Cardiogenic Shock (n=186)
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INTERMACS Profiles2007
0102030405060708090
100
1 2 3 4 5 6 7
Inotrope Dependent
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Cardiowest Total Artificial Heart
First and only Artificial Heart to receive FDA, Health Canada and CE ApprovalHighest bridge-to-transplant rate* 79% of all approved BTT devicesHighest cardiac output of all mechanical circulatory support devices (up to 9.5L/min)Indicated for use as a bridge-to-transplant –complete circulatory support system for patients with irreversible biventricular heart failure
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TAH-t Advantages
11
22
44
33
1) Decreased CVP
2) Overcome PAP
3) Cardiac output
4) Organ Recovery
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Freedom Portable Driver: Stable Patients Transition from Implant/ICU Driver
• Portable – 12.5 lbs• Backpack or Shoulder Bag • Simple User Interface
– Charge batteries – Change driver– CO, Rate, Left Fill Volume
• Charge from Many Sources• Optional Extended Battery• Service by Replacement• Available at centers
participating in IDE study
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New VAD Technology Summary
Key to success is matching recipient physiology/needs with VAD capabilitiesNewer generation VADS have many advantages-smaller size, efficient power utilization, effective end–organ perfusion Preload-dependent and afterload-sensitiveLimitations include RV function, anticoagulation, durabilityBiventricular failure requires full hemodynamic support using TAH
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