UPDATED IMAGING GUIDELINES FOR NUCLEAR CARDIOLOGY PROCEDURES
The Current Role of Nuclear Cardiology In Modern Health Care · 2016-08-09 · The Current Role of...
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The Current Role of Nuclear CardiologyIn Modern Health Care
IAEA Consultants’ MeetingVienna, Austria
August 23-27, 2010
Fernando Mut, MDUruguay
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• Nuclear Cardiology: diagnosis vs. prognosis.• Evidence for cost-effectiveness in CAD management.• The need for quality studies.• The role in prevention: asymptomatic patients.• The power of combined (hybrid) imaging.• Technical improvements.• Functional imaging of atherosclerosis.
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Cardiovascular deaths in the U.S.1979 - 2004
Rosamond et al. Circulation 2008
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ATHEROSCLEROSIS QUANTITATIONISCHEMIA QUANTITATION
INTEGRATION
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Prognostic Value of MPI in Definite or Suspected CAD(n=28,920)
0123456789
10
1 99 41 9
9 51 9
9 61 9
9 71 9
9 81 9
9 92 0
0 02 0
0 12 0
0 3
1 99 41 9
9 51 9
9 61 9
9 71 9
9 81 9
9 92 0
0 02 0
0 1
Abnormal MPS Normal MPS
0.77% / yr 5.2% / yr
Underwood Eur J Nuc Med & Molecular Imaging 2004
Event rate %
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Relationship Between Extent of Ischemiaand Cardiac Events*
(n=1,689)
Adapted from Ladenheim ML, et al. J Am Coll Cardiol 1986
2020
4040
6060
0000 22 44 66
Number of Reversible Defects Number of Reversible Defects
Card
iac
Even
t Rat
e %
Card
iac
Even
t Rat
e %
*Imaging protocols included thallium.*Imaging protocols included thallium.
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0.0%1.0%2.0%3.0%4.0%5.0%6.0%7.0%8.0%9.0%
10.0%
Low Risk High Risk
0.85% / yr
5.9% / yr
Shaw & Iskandrian J Nuc Cardiol 2004
� Tl-201� Tc-99m Sestamibi� Tc-99m Tetrofosmin
Normal Perfusion or SSS 0-3 Large Defects, SSS>13
Prognostic Value of MPI (n=69,655)
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Current State of Health Care Systems
Source: CMS, Office of the Actuary, National Health Statistics Group 2004
High Cost of High Cost of ““SicknessSickness”” or or Symptom CareSymptom Care
~50% of health care costs for ~50% of health care costs for endend--stage or hospital care.stage or hospital care.
Reduced Cost for Reduced Cost for ““WellWell”” or or Subclinical Care Subclinical Care
Early Intervention Model: Early Intervention Model: Shift care to early, subclinical diagnosis Shift care to early, subclinical diagnosis potential to reduce endpotential to reduce end--stage costsstage costs
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Prognostic Value of Quantitative SPECT: Prediction of Cardiac Death & Nonfatal MI by Extent & Severity of
Stress Myocardial Perfusion Abnormalities
Hachamovitch et al. Circulation 1998 Summed Stress Score (SSS)
. . . .0
1
2
3
4
5
0.3 0.5 0.8
2.72.3
4.2
CDMI
n = 2946 884 455 898
2.9 2.9
Low Mild Moderate Severe(0-3) (4-8) (9-13) (>13)SSS
% An
nual
CD or
MI
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•• No No HxHx CADCAD•• Known CAD Known CAD •• PostPost--PTCAPTCA•• PostPost--CABG CABG •• Men and WomenMen and Women•• SxSx and and AsxAsx•• DMDM•• ElderlyElderly
Abnormal Stress SPECT: Risk Increases as Function of Perfusion Extent / Severity in All Populations
Extent/Severity of Perfusion Defects
Risk
Klocke et al. J Am Coll Cardiol 2003
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Prognostic Value of MPS in Definite or Suspected CAD(n=69,655)
Shaw LJ, Iskandrian AE. J Nucl Cardiol 2004
0
2
4
6
8
10
12Ca
rdiac
Dea
th or
MI R
ate
(% / Y
ear)
Wome
n
Men
Diab
etics
Non-
Diab
etics
Diab
etic
Wome
nDi
abeti
cMe
n
Low RiskHigh Risk
High Risk = High Cost!
Low riskHigh risk
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log Ha
zard R
atio
log Ha
zard R
atio
00112233445566
% Total Myocardium Ischemic% Total Myocardium Ischemic00 12.5%12.5% 25%25% 32.5%32.5% 50%50%
Medical therapyMedical therapy
Revascularization
**PP<0.001<0.001
Hachamovitch et al. Circulation 2003
10,627 patients10,627 patients146146 Cardiac deathCardiac death492 All cause mortality492 All cause mortality
Risk of Cardiac Death & Ischemic BurdenPost-SPECT Therapeutic Decisions
Reduced risk = Reduced Cost!
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Pre-Rx TPD: 28%
12 mPre-Rx
12m TPD: 2%
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RR = 0.47 (95% CI = 0.23-0.95) p = 0.037
Rates of Death or MI by Ischemia ReductionDe
ath or
MI Ra
te (%)
24.7%24.7%
13.4%13.4%
Shaw LJ et al. Circulation 2008
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Summary•• A growing body of Economic EvidenceA growing body of Economic Evidence supports stress MPI supports stress MPI
testing as CE tool for appropriately selected women & men with ktesting as CE tool for appropriately selected women & men with known nown or suspected CAD. or suspected CAD.
•• CE Diagnostic Strategies in CAD:CE Diagnostic Strategies in CAD:–– MPI as gatekeeper to MPI as gatekeeper to AngioAngio–– IntermediateIntermediate--High Risk pts.High Risk pts.–– Early D/C of ACS pts.Early D/C of ACS pts.–– Asymptomatic pts.?Asymptomatic pts.?
•• Stress MPI is a mature technology with wellStress MPI is a mature technology with well--established established body of evidence!body of evidence!–– Highly accurate at guiding therapeutic decision making (functionHighly accurate at guiding therapeutic decision making (functional al
data)data)–– Anatomic data influence utilization of revascularization and incAnatomic data influence utilization of revascularization and increase rease
costs; without a direct link to improved outcome.costs; without a direct link to improved outcome.
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Simplistic View of Cost Effectiveness PlaneNew TestMore Costly
New TestMore Effective
New TestLess Costly
New TestLess Effective
New TestMore Effective But More Costly
New TestDominates
New TestLess Costly ButLess Effective
Old TestDominates
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Road Map and Tools for Achieving Quality Nuclear Studies
Patient Testselection
Image acquisition
Imageinterpretation
Resultscommunication
Better patient care
ACC-Duke Think Tank, JACC 2006
RegistriesResearchOutcomes, ValueKey data elements
Uniform structured reportsTimeliness standards
Appropriateness criteriaBenchmarkingProvider education
Lab accreditationTechnologist cert.
Lab accreditationPhysician trainingPhysician competency
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Life tables for WHO member states, Geneva, WHO 2006http://www.who.int/whosis/database/life_tables.cfm
Country Men WomenRussia 59 72India 62 64Brazil 68 75China 71 74Argentina 72 78Cuba 75 79USA 75 80Canada 78 83Italy 78 84Australia 79 84Japan 79 86
Population is aging
BRIC Emerging Economies Developing Countries
Population is Aging
Implications to NC
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Primary Prevention Disease Detection Risk StratificationSecondary Prevention Clinical TreatmentRevascularization
Atherosclerosis progression
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• Man, 49 yo• Stressful lifestyle• High cholesterol, Hypertension• Asymptomatic
Case from Brazil (Dr. Vitola)
• TMT• Bruce 14 min• ST negative• No chest pain• Duke Score 14
• Calcium score CT: 408
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Shaw LS et al. Radiology 2003Shaw LS et al. Radiology 2003
CCS: Cohort > 10,000 asymptomatic patients
15 - 46% SPECT abnormalHe ZX et al. Circulation 2000He ZX et al. Circulation 2000Berman DS et al. JACC 2004Berman DS et al. JACC 2004
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Sep Lat
Ap
Ant
Inf
Ap
Repouso
Repouso
Estresse
Estresse
Estresse
Repouso
AntLat
Inf
Sep
Stress – Rest MPI (pre treatment)
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Sep Lat
Ap
Ant
Inf
Ap
Repouso
Repouso
Estresse
Estresse
Estresse
Repouso
AntLat
Inf
Sep
Stress – Rest MPI (post PCI ADA)
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Annual hard event rates as a function of % myocardium ischemic in asymptomatic pts.
Zellweger et al. J Nucl Cardiol 2009
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Event-free survival vs. low or high risk myocardial ischemia in asymptomatic pts.
Zellweger et al. J Nucl Cardiol 2009
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Incremental prognostic value of MPI in asymptomatic pts.
Zellweger et al. J Nucl Cardiol 2009
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Incremental sensitivity for CAD detection of not-fused vs. fused MPI + CTA over MPI alone
Santana et al. J Nucl Cardiol 2009
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MPI + CTA Fusion: single-vessel CAD
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MPI + CTA Fusion: multi-vessel CAD
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Incremental prognostic value of post-exercise gated SPECT
Candell-Riera et al. J Nucl Cardiol 2009
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Digirad Cardius 3 XPO
Advances in technical aspects of MPI
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CardiArc
Advances in technical aspects of MPI
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D-SPECT
Advances in technical aspects of MPI
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Higher System Sensitivity
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Advances in technical aspects of MPI
MP-SPECT (Eagle Heart Imaging)
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Advances in technical aspects of MPI
GE – Ultra Fast Cardiac
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UFC images Standard images
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Advances in technical aspects of MPI
SIEMENS IQ SPECT
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SIEMENS IQ SPECT
Stress and rest, 4 min each
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Advances in technical aspects of MPI
Slomka et al. J Nucl Med 2004
Motion frozen (MF) reconstruction
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Human thrombus imaging with 99mTc-Annexin V
Sarda-Mantel et al. Arterioscler Thromb Vasc Biol 2006
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Human thrombus imaging with 99mTc-Annexin V
Endocarditis foci in rabbit
Rouzet et al. Circulation 2008
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Potential for research:• Clinical – asymptomatic target groups
Pre-clinical evaluationSelective preventionIndicated prevention
• Technical – new parameters• Mixed – CTA gold standard?
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• Diabetes >5 years• Diabetes with poorly controlled glycemia• Peripheral artery disease• Cerebrovascular disease• Atrial fibrillation• Left ventricular hypertrophy• Autoimmune diseases• Non-cardiac major surgery• Polycystic ovarian syndrome• Early menopause (<40 years)• Chronic renal disease
Candidates for SELECTIVE PREVENTION
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ThankThank youyou