coronary artery calcification : w hat it means and how to use it
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A major teaching hospital of Harvard Medical School. Coronary Artery Calcification : W hat It Means and How to Use It. Melvin E. Clouse, M.D. Coronary Artery Calcification:. Wosika& Sosman-JAMA, 1934; 102:591-593 Snellan & Nauta-Fortschr Rontgenstahlen, 1937; 56:277-286 - PowerPoint PPT PresentationTRANSCRIPT
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Coronary Artery Calcification:What It Means and How to Use It
Melvin E. Clouse, M.D.
A major teaching hospital of Harvard Medical School
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Coronary Artery Calcification:• Wosika& Sosman-JAMA, 1934; 102:591-593• Snellan & Nauta-Fortschr Rontgenstahlen, 1937;
56:277-286• Habbe & Wright-Detection Coronary
Atherosclerosis. AJR, 1950; 63: 50-62• Blankenhorn & Stern-AJR, 1959; 81: 772-777• Electron Beam Computed Tomography: Imatron
(David King) • Agatston & Janowitz-Quantification of Coronary
Artery Calcium Using Ultrafast Computed Tomography. JACC 1990; 15: 827-32.
• Software Development Scoring/Reconstruction
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Do We Need A New Test?
• Is there a problem?
• Will it be effective?
• Evaluate Current Trends
• Evaluate New Test
• Time line for acceptance
A major teaching hospital of Harvard Medical School
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• 1.5 Million MIs per year and over 500,000 deaths per year.
• 40% of all deaths are in the US to CV disease. In 150,000 – 250,000 Americans the only symptom of CVD is a fatal heart attack
Conclusion: Desperate need for further early warning system
CORONARY ARTERY DISEASE
Magnitude of the Problem
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P.T.
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204 M<55, F <65 with MIs
• 60 % had LDL <131 mg/dl
• 41 % had LDL <100 mg/dl
• 38 % had LDL >130 mg/dl
• Only 25% would have qualified for Statins
using NCEP AATP III guidelines
Akosah et al, JACC 2003
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Examples of Coronary Artery Scans
NO
CALCIFICATION
“zero score”
MODERATE
CALCIFICATION
SIGNIFICANT
CALCIFICATION
“high score”
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Rx Recommendations/Ca++ ScoreSCORE 0
Risk Factor Modification onLo fat diet, Weight Reduction, No SmokingSerum LDL 100 mgm/dlFor Elevated LDL -- STATIN DrugsRe-exam 3 years
MODERATE SCORE – 25-50th %tileRisk Factor Modification – As AboveLDL 100 mgm/dlRe-exam 1 year
HI SCORE -- 75-90%tileTreadmill MIBI -- Same as above withStatins/LDL 100 mgm/dl
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EBCT & NCEPIn Asymptomatic Women
304 without SX NCEP Hi Risk NCEP Lo Risk
EBCT+, EBCT-42% EBCT+ (score 73% tile) 58% EBCT-NCEP Hi Risk- 53.5% EBCT+: 37.7% EBCT -NCEP Lo Risk -46.5% EBCT+: 62.3% EBCT -
Lo Risk NECP (47% EBCT +) would not receive Rx Hi Risk NECP (37% EBCT -) would receive Rx
Hecht and Superko JACC 37:1506-1515 ( 1)
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Using Ca++ as Reference Rx
58.6% Correctly Identified
<55 yrs. 65% correct>55 yrs. 52.2% correct
Hecht #2
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Predictive Value CAC inPts. presenting with Chest Pain in ER
192 Pts (Mean Age 53 9 yrs.) followed 50 10 mo
•Excluded Pts with MI Dx
•Annualized Event Rate/yr.
0.6%/yr. for Score 0
13.9%/yr. for Scores >400 (P<0.001)
(22 of 38 pts with Scores >400 had cardiac event)Georgiou JACC 2001;38:105-10
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NCEP ATP IIDietary Intervention
LDL-C >130 mg/dL > 2 Risk Factors
Drug RxLDL-C >160 mg/dL HDL-C < 35 mg/dL (also risk factor)
JAMA 269;3015-23, 1993
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Total Cholesterol Education Program
ATP II ATP IIITotal Cholesterol100-200 100-199LDL 62-130 62-99HDL 35-77 40-77Triglycerides 30-200 30-149Lp(a) 30-140 <30
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Framingham Heart StudyScore and Risk Prediction
Multivariable Statistical Model
Age Total Hypertension CholesterolSex HDLSmoking LDLDiabetes Triglycerides
Estimates coronary event risk in asymptomatic populations.
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Note: Risk estimates were derived from the experience of the Framingham Heart Study, a predominantly Caucasian population in Massachusetts, USA.
Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults. JAMA. 2001;285:2486-2497.
Assessing CHD Risk in MenStep 1: Age
YearsPoints
20-34 -935-39 -440-44 045-49 350-54 655-59 860-64 1065-69 1170-74 1275-79 13
Step 2: Total Cholesterol
TC Points at Points at Points at Points at Points at (mg/dL) Age 20-39 Age 40-49 Age 50-59 Age 60-69 Age 70-79
<160 0 0 0 0 0 160-199 4 3 2 1 0 200-239 7 5 3 1 0 240-279 9 6 4 2 1 280 11 8 5 3 1
HDL-C(mg/dL) Points
60 -1
50-59 0
40-49 1
<40 2
Step 3: HDL-Cholesterol
Systolic BP PointsPoints
(mm Hg) if Untreated if Treated
<120 0 0120-129 0 1130-139 1 2140-159 1 2160 2 3
Step 4: Systolic Blood Pressure
Step 5: Smoking Status
Points at Points at Points at Points at Points at
Age 20-39 Age 40-49 Age 50-59 Age 60-69 Age 70-79 Nonsmoker 0 0 0 0 0Smoker 8 5 3 1 1
Age
Total cholesterol
HDL-cholesterol
Systolic blood pressure
Smoking status
Point total
Step 6: Adding Up the Points
Point Total 10-Year Risk Point Total 10-Year Risk
<0 <1% 11 8%0 1% 12 10%1 1% 13 12%2 1% 14 16%3 1% 15 20%4 1% 16 25%5 2% 17 30%6 2%7 3%8 4%9 5%
10 6%
Step 7: CHD Risk
ATP III Framingham Risk Scoring
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Non-Invasive Testing Coronary Ca++
Risk-NCEP ATP III Population Recommend
Low 35% LifestyleHCE<10%
Intermediate 40% Noninvasive test Ca++,diet, statin
HCE<20%
High 25% IntensiveCHD, HTN, Diabetes intervention
(statins)FHS-Risk HCE/10yr >20%
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Risk Assesment of Asymptomatic Patients
Coronary Ca++ studies must be able to predict the risk of future coronary events.
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CAC/Predictor HCEPhysician/self referral
Arad et al 1996 Circulation 1173 pts
Arad et al 2000 JACC 1172 pts
Raggi & Callister 2000 Circulation 172/632 pts
Raggi & Callister 2001 AHJ 676/10,122 pts
Kondos 2003 Circulation 5635 pts
Shaw & Raggi 2003 Radiology 10,377pts
Wong et al 2000 AJC 926 pts
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Predictive Value EBCT Coronary Arteries
19 mo follow-up 1173 pts.Mean age 53 +/- 11 yrs.18 subjects had 26 cv eventsCa++ thresholds
Score Sen % Spec % 100 89 77160 89 82600 50 95
Odds ratio range 20-34.4 (P<0.0009-0.00001) ARAD Circulation 1996
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CAC Predictor HCEProspective Studies
Gerci, et al 2003 SFHS 5585 pts
South Bay Heart Watch:
Secci, et al 1997 Circulation 326 (462/461)Detrano, et al 1999 Circulation 1196 pts/2-3yr*Park, et al 2002 Circulation 967 pts / 6yrsGreenland 2004 JAMA 1312 pts /7yrs
(risk factor nor CAC event predictor, CAC no sig. incremental value,use not justified)
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CAC/FRS
Non heterogeneous multi ethnic population 1029, 65+/- 7.8 years
CAC score >300 associated with higher risk coronary event than FRS alone.
Sig. Use when FRS is in 10-19% range for HCE in 10 years
Greenland et al. JAMA 2004;291:210-15
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Predicting Coronary Death or Nonfatal Myocardial Infarction for Framingham Risk Scores (FRS)
The receiver operating characteristics curves illustrate FRS alone or plus coronary artery calcium score (CACS). Area under the curves are 0.63 for FRS alone, 0.68 for FRS plus CACS. P<.001 for the comparison between the 2 areas. Greenland et al, JAMA 2004; 291:210-215
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17 y/o male
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32 y/o female
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0
20
40
60
80
100
0.5 mm threshold
0.3 mm threshold
13-19 20-29 30-39 40-49 >50
17% 21%
37%
66%
60%
75%
71%
85% 85%
91%
Pre
vale
nc
e o
f C
oro
na
ry
Ath
ero
scle
rosi
s (
%)
Tuzcu et al. Circulation 2001; 103:2705-2710
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Atherosclerosis/CVD
• Long term, indolent, preventable disease• Accounts for 40 % of all deaths
– >2nd thru 7th leading causes of adult death combined
• 84.7 % who die are older than 65 years• 80% CHD mortality in individuals < 65 years of
age occurs during 1st attack • 57% men and 64% women who die suddenly
had no previous symptoms (150,000)• Cost – 386.4 billion (greater than 1/3 of our $1
trillion dollar health care economy)
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CAC Summary• Follow CAC over time (RFM)
• Stable/Progression/Regression• Combine with FRS/NCEP ATP III• Before statin treatment• Cost benefit analysis algorithm initial
exam for cardiac work up• Chest pain patients-screen EW pts.
Rumberger et al, JACC 1999;33:453-62Raggi et al, Am J Cardiol 2000;85:283-28
Hect & Superko, JACC 2001;37:1 506-1 511Laudon et al, J Emergency Med 1999
Waters et al, Clin Investigation 1993
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HOMELAND SECURITY
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CAC Summary• Scanning technology validated
– Reproducible, variability – EBCT/MDCT
• Independent predictive value CAC for HCE• Only non-invasive method to demonstrate
total plaque burden• Plaque burden: most important predictor of
– hard coronary events / mortality
• Only non-invasive test to detect early CAD • Quantify disease• Institute measures to stop progression• Monitor disease progress
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Development of Coronary Artery Plaque
Consistent with the “diffuse” nature of coronary artery disease, plaque development can be seen in various stages
in multiple areas of the coronary artery system.
EBT “positive” for coronary calcium
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Atherosclerosis Timeline
FoamFoamCellsCells
FattyFattyStreakStreak
IntermediateIntermediateLesionLesion AtheromaAtheroma
FibrousFibrousPlaquePlaque
ComplicatedComplicatedLesion/RuptureLesion/Rupture
Endothelial Dysfunction
From first decade From third decade From fourth decade
Growth mainly by lipid accumulation Smooth muscleand collagen
Thrombosis,hematoma
Stary HC, et al. Circulation. 1995;92:1355-74. Artery wall often gets larger with increasing plaque-Glagov NEJM 1987