Vitamin Supplements and Cardiovascular DiseaseVitamin Supplements and Cardiovascular Disease Howard...
Transcript of Vitamin Supplements and Cardiovascular DiseaseVitamin Supplements and Cardiovascular Disease Howard...
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Vitamin Supplements and Cardiovascular Disease
Howard N. Hodis, M.D.Atherosclerosis Research Unit
University of Southern California
Funded by National Institute on AgingR01-AG13860 and R01-AG17160
andOffice of Dietary Supplements
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Reduction in Coronary Events in Major LDL-C Lowering Clinical Trials
Risk Reduction (N)Study Overall Men Women Baseline LDL
Secondary Prevention4S1 34% (4444) 34% (3617) 35% ( 827) 188 mg/dLCARE2 24% (4159) 20% (3577) 45% ( 582) 139 mg/dLLIPID3 24% (9014) 26% (7498) 11% (1516) 150 mg/dL
Primary PreventionWOS4 31% (6595) 31% (6595) n/a 192 mg/dLAfcaps5 36% (6605) 37% (5608) 46% ( 997) 150 mg/dL
1Lancet 1994;344:1383-1389. 2N Engl J Med 1996;335:1001-1009. 3N Engl J Med 1998;339:1349-1357.4N Engl J Med 1995;333:1301-1307. 5 JAMA 1998;279:1615-1622.
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Therapies Beyond LDL-C
Triglyceride-rich lipoprotein reduction
HDL-C elevation
Hormone replacement therapy
Antioxidant vitamin supplementationHomocysteine reduction
Infection/Inflammation
Lp(a) reduction
ApoC-III
Fibrinogen
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Epidemiological Studies – Antioxidant VitaminsVitamin E Vitamin C ß-carotene
NHS 0.54 (0.36-0.82) 0.80 (0.58-1.10) 0.78 (0.59-1.03)Nonfatal MI or coronary death
IWHS 0.38 (0.18-0.80)-diet 1.43 (0.75-2.70) 1.19 (0.67-2.12)CHD death
HPFS 0.70 (0.55-0.89) 1.25 (0.91-1.71) 0.71 (0.53-0.86)Nonfatal MI, coronary death or revascularization
FMC:men 0.68 (0.42-1.11) 1.00 (0.68-1.45) 1.02 (0.70-1.48)CHD death
FMC:women 0.35 (0.14-0.88) 0.49 (0.24-0.98) 0.62 (0.30-1.29)CHD death
Vitamin CBDHSSS 0.80 (0.60-1.30) CVD deathWES 0.75 (0.52-1.07) CHD deathACS 1.01 Circulatory disease deathNHANES 0.66 (0.53-0.82) CVD deathß-caroteneWES 0.84 CHD deathMHCPS 0.54 (0.34-0.86) CVD death
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Summary of Antioxidant Vitamin Supplementation Randomized Controlled
Event Trials of CVD
Relative Risk(95% CI)Relative Risk(95% CI)
TrialTrial NN Supplement Supplement FollowFollow--up Primary CVD up Primary CVD CVDCVD(daily)(daily) (years) Outcome (years) Outcome MortalityMortality
CHAOSCHAOS 2,0022,002 EE--800/400 IU800/400 IU 1.39 0.53(0.341.39 0.53(0.34--0.83)* 1.18(0.620.83)* 1.18(0.62--2.27)2.27)GISSIGISSI 11,32411,324 EE--300 IU300 IU 3.5 0.95(0.863.5 0.95(0.86--1.05)1.05) 1.00(0.881.00(0.88--1.14)1.14)HOPEHOPE 9,5419,541 EE--400 IU400 IU 4.5 1.05(0.954.5 1.05(0.95--1.15)1.15) 1.05(0.901.05(0.90--1.22)1.22)SPACESPACE 196196 EE--800 IU800 IU 1.42 0.54(0.331.42 0.54(0.33--0.89)* 0.61(0.280.89)* 0.61(0.28--1.30)1.30)PPPPPP 4,495 4,495 EE--300 IU300 IU 3.6 1.07(0.743.6 1.07(0.74--1.56)1.56) 0.86(0.490.86(0.49--1.52)1.52)HPSHPS 20,536 20,536 EE--600 IU+600 IU+ 5 1.02(0.945 1.02(0.94--1.11)1.11) 1.05(0.951.05(0.95--1.15)1.15)
CC--250 mg+250 mg+ßß--carotenecarotene--20 mg20 mg
**SignficantSignficant
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Summary of Antioxidant Vitamin Supplementation2x2 Randomized Controlled Trials of CVD
TrialTrial NN FollowFollow--upup TreatmentTreatment Relative Risk(95% CI)Relative Risk(95% CI)(years)(years) CVD OutcomeCVD Outcome
GISSIGISSI 11,32411,324 3.53.5 EE--300 IU300 IU 0.95(0.860.95(0.86--1.05)1.05)nn--3 PUFA3 PUFA 0.90(0.820.90(0.82--0.99)0.99)
HOPEHOPE 9,5419,541 4.54.5 EE--400 IU 400 IU 1.05(0.951.05(0.95--1.15)1.15)ACE inhibitorACE inhibitor 0.78(0.700.78(0.70--0.86)0.86)
PPPPPP 4,4954,495 3.63.6 EE--300 IU 300 IU 0.94(0.770.94(0.77--1.16)1.16)AspirinAspirin 0.77(0.620.77(0.62--0.95)0.95)
HPS HPS 20,53620,536 55 EE--600 IU+C600 IU+C--250 mg 250 mg 1.02(0.941.02(0.94--1.11)1.11)+B+B--carotenecarotene--20 mg20 mgStatinStatin 0.83(0.750.83(0.75--0.91)0.91)
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Summary of Antioxidant Vitamin Supplementation Randomized Controlled
Atherosclerosis Imaging Trials
4 RCT’s with atherosclerosis progression as the primary outcome
Carotid intima-media thickness by B-mode ultrasonography
Antioxidant Supplementation in Atherosclerosis Prevention Study (ASAP)J Int Med 2000;248:377-386
Study to Evaluate Carotid Ultrasound Changes in Patients Treated with Ramipril and Vitamin E (SECURE)Circulation 2001;103:919-925
Coronary artery disease by quantitative coronary angiography
HDL Atherosclerosis Treatment Study (HATS)N Engl J Med 2001;345;1583-1595
Women’s Angiographic Vitamin and Estrogen Trial (WAVE)JAMA 2002;288;2432-2440
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Antioxidant Supplementation in Atherosclerosis Prevention Study (ASAP)
0
0.005
0.01
0.015
0.02
0.025
Men Women
P lac e boVitamin EVitamin CB o th vitamins
mm
/yea
r
p = 0.008
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Summary of Randomized Controlled Trials - Vitamin E
Whether vitamin E supplementation reduces the progression of subclinical atherosclerosis in a healthy cohort of men and women at low-risk for CVD remains untested
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Vitamin E Atherosclerosis Prevention Study (VEAPS)
Study Design: randomized, double-blind,placebo-controlled trial
Subjects: 353 healthy men and women >40years old without preexisting CVD
Intervention: 400 IU/day of synthetic DL-α-tocopherolplacebo
Follow-up: 3 years
1o outcome: rate of change of the right distal far wall CCA IMT in computer image processed B-mode ultrasonograms obtained every 6 months
Hodis, et al. Circulation 2002;106:1453-1459.
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Plasma Vitmain E Levels (µmol/L)
Placebo Vitamin E p-value(n = 170) (n = 162)
Baseline 23.2+6.3 22.1+6.3 0.16On-trial 30.9+6.2 53.3+12.7 <0.0001
p-value <0.0001 <0.0001
Hodis, et al. Circulation 2002;106:1453-1459.
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Effect of Vitamin Eon LDL Oxidation in VEAPS
LDL Lag Time
0
10
20
30
40
50
60
70
Min
utes
Placebo Vitamin E
LDL-
0
0.5
1
1.5
2
% E
lect
rone
gativ
e LD
L
Placebo Vitamin E
p=0.03 p=0.01
Hodis, et al. Circulation 2002;106:1453-1459.
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VEAPS Primary Trial Results
0
0.001
0.002
0.003
0.004
0.005PlaceboVitamin E
Females MalesAll Subjects
p = 0.13 p = 0.40 p = 0.11
IMT
Prog
ress
ion
Rat
e, m
m/y
n= 170 162 n= 87 85 n= 83 77
Hodis, et al. Circulation 2002;106:1453-1459.
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Summary
Supplementation with DL-α-tocopherol significantly raised plasma vitamin E levels and reduced LDL- and LDL oxidative susceptibility relative to placebo.
However, vitamin E supplementation did not reduce the progression of CCA IMT over a 3-year period, overall and stratified by sex.
Clinically significant side-effects were not observed.
Hodis, et al. Circulation 2002;106:1453-1459.
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Conclusion
Use of vitamin E in primary or secondary prevention of CVD for the general population at large is not currently supported by RCT’s.
VEAPS indicates that in well-nourished healthy vitamin E replete individuals at low risk for CVD, vitamin E supplementation has no perceptible effect on the progression of atherosclerosis.
However, the data indicate that special populations, perhaps those with low serum antioxidant vitamin levels may derive CVD benefit from antioxidant vitamin supplementation.
Hodis, et al. Circulation 2002;106:1453-1459.
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Therapies Beyond LDL-C
Triglyceride-rich lipoprotein reduction
HDL-C elevation
Hormone replacement therapy
Antioxidant vitamin supplementationHomocysteine reduction
Infection/Inflammation
Lp(a) reduction
ApoC-III
Fibrinogen
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CBS: cystathionine β synthaseMTHFR: methylenetetrahydrofolate reductaseBHMT: betaine homocysteine methyltransferaseMS: methionine synthaseCL: cystathionine lyase
CysteineCL
CpG
mCpG
`
CBS
BHMT
MTHFR
Tetrahydrofolate(THF)
Methionine
S-adenosylmethionine
S-adenosylhomocysteine
Homocysteinethiolactone
Homocysteine
Homocystine
Homocysteinecysteine disulfide
Cystathionine
Homoserine
Dimethylglycine
Betaine
5-methyl THF
5,10-methylene THF MS
B12
B6
Protein
SerineFolic acid
B6
B12
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Homocysteine and CHD
[log] Odds Ratio (95% CI)50
Graham, 1994Wicken, 1983
Murphy-Chutorian, 1985Wilcken, 1976
Clarke, 1991Kang, 1986
Alfthan, 1994Pancharuniti, 1994
Malinow, 1990Von Eckardstein, 1994
Stampfer, 1992Ubbink, 1991Genest, 1990
Wu, 1994Israelsson, 1988
Summary
0.4 1 104 4020532 300.5
Boushey, et al. JAMA 1995;274:1049-1057.
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Boushey, et al. JAMA 1995;274:1049-1057.
Homocysteine andCerebrovascular Disease
[log] Odds Ratio (95% CI)0.4 1 104 504020532 300.5
Graham, 1994Brattstrom, 1984
Clarke, 1991Verhoef, 1994Alfthan, 1994
Araki, 1989Coull, 1990
Brattstrom, 1990Brattstrom, 1992
Summary
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Homocysteine andPeripheral Vascular Disease
Boushey, et al. JAMA 1995;274:1049-1057.
[log] Odds Ratio (95% CI)0.4 1 104 504020532 300.5
Graham, 1994Clarke, 1991
Molgaard, 1992Bergmark, 1993
Brattstrom, 1990
Summary
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Summary
Plasma homocysteine is a strong, independent, continuous risk factor for atherosclerotic vascular disease.
Each 5 µmol/L increase in plasma homocysteine, equal to about 1 SD in the normal population is associated with a 60% increase in risk for CHD in men and an 80% increase in women, and a 90% increase risk for cerebrovascular disease in men and women.
The CHD risk for each 5 µmol/L increase in homocysteine is equivalent to the effect of a 20 mg/dL rise in plasma cholesterol.
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Plasma homocysteine levels rise approximately 25% after 50 years of age and after 60 years of age there is a progressive rise in homocysteine levels with advancing age in men and women that may partially account for the age-related risk for CVD in the elderly.
The rise in plasma homocysteine levels parallels the age-related decrease in serum levels of folate, vitamin B6 and vitamin B12.
Several biologic mechanisms associated with aging such as malabsorption can result in reduced serum vitamin levels. However, insufficient dietary intake plays a major role.
Homocysteine in the Elderly
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Data from the Third NHANES indicate the following in individuals >50 years old:
Recommended DV* % Consumed % Consumedby women by men
Folate 400 µg 51-58% 62-74% Vitamin B6 2 mg 63-70% 84-92% Vitamin B12 6 µg 43-49% 62-75%
*Daily Value
Homocysteine in the Elderly
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1015202530354045505560
4 6 8 10 12 14 16 18 20Plasma Homocysteine (umol/L)
Perc
enta
ge o
f sub
ject
sw
ith >
25%
Ste
nosi
s
WomenMen
Selhub, et al. NEJM 1995;332:286-291.
Association between Plasma Homocysteine Concentrations and Carotid Artery Stenosis
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PLASMA HOMOCYSTEINE LEVELS,
MULTIVITAMINS USE, AND
SUBCLINICAL ATHEROSCLEROSIS
Funded by National Institute on Aging R01-AG13860
Vitamin E Atherosclerosis Prevention Study (VEAPS)
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0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
CC
A IM
T (m
m)
CCA IMT by Quartiles of Fasting TotalPlasma Homocysteine Levels in VEAPS
Mean + SE
< 5.99 5.99- 6.99- > 8.486.98 8.47
(n = 88) (n = 88) (n = 88) (n = 87)
0.74 + 0.140.74 + 0.12
0.74 + 0.13
0.80 + 0.14
p = 0.005
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5.5
6
6.5
7
7.5
8
8.5
9
tHcy
(nm
ol/m
l)
Fasting Total Plasma Homocysteine (tHcy) Levels in Current Multivitamin
Users vs Non-Users
Users Non-users(n = 190) (n = 160)
p = 0.01Mean + SE
7.2 + 0.15
7.8 + 0.19
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0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
CC
A IM
T (m
m)
CCA IMT in Current MultivitaminUsers vs Non-Users
Users Non-users(n = 190) (n = 160)
p = 0.06Mean + SE
0.74 + 0.010.77 + 0.01
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0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Before Treatment After Treatment2.7+1.7 y 1.6+0.9 y
(range 0.9 to 6.0 y) (range 0.8 to 4.2 y)
Plaq
ue A
rea
(cm
2 )
Hackam, et al. AJH 2000;13:105-110.
Effect of Homocysteine Lowering on Carotid Plaque (n=100)
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Effect of Homocysteine Lowering on Coronary Artery Restenosis (6 month follow-up)
Variable Folate+B6+B12 Placebo p-value(n=121) (n=110)
Male/Female 80/25 79/21 0.76Age (yr) 61+11.3 61.1+11.5 0.91Plasma homocysteine (µmol/L)
Baseline 11.0+3.9 10.8+ 3.9 0.71Follow-up 7.3+2.4 9.3+3.6 <0.001
Minimum luminal diameter (mm)Before PTCA 0.95+0.49 0.86+0.47 0.16After PTCA 2.33+0.64 2.27+0.57 0.45At follow-up 1.72+0.76 1.45+0.88 0.02
Degree of stenosis (%)Before PTCA 66.8+15.1 69.2+15.6 0.24After PTCA 23.6+10.1 23.4+10.1 0.85At follow-up 39.9+20.3 48.2+28.3 0.01
Schnyder, et al. NEJM 2001;345:1593-1600.
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No.(%)
Event Folate +B6+B12 Placebo Hazard Ratio p-value(n=272) (n=281) (95% CI)
Target lesion 27(9.9) 45(16) 0.61(0.41-0.95) 0.02revascularizationAny revascular 38(14) 56(19.9) 0.69(0.51-0.98) 0.04Nonfatal MI 7(2.6) 12(4.3) 0.57(0.27-1.42) 0.17Cardiac death 3(1.1) 6(2.1) 0.51(0.15-2.00) 0.23Any death 4(1.5) 8(2.8) 0.52(0.21-1.56) 0.17Any event 42(15.4) 64(22.8) 0.66(0.47-0.94) 0.01
Effect of Homocysteine Lowering on Clinical Outcome after PTCA (12 month follow-up)
Schnyder, et al. JAMA 2002;288:973-979.
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Clinical Trials to Assess the Effect ofHomocysteine Lowering on CVD
Trial Population n Intervention
Norwegian Study of MI 3000 FA(0.8mg)+B6(40mg) Homocysteine Lowering +B12(0.4mg) with B-vitamins in MyocardialInfarction (NORVIT)
Western Norway B Vitamin CHD 2000 FA(0.8mg)+B6(40mg) and Trial (WENBIT) +B12(0.4mg)
Prevention with a Combined CAD or 10000 FA(0.2 or 2mg) Inhibitor and Folate in high riskCoronary Heart Disease(PACIFIC)
Heart Outcomes Prevention MI or 5000 FA(5mg)+B6(50mg) Evaluation-2 (HOPE-2) high risk +B12(1mg)
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Clinical Trials to Assess the Effect ofHomocysteine Lowering on CVD
Trial Population n Intervention
Vitamin Intervention Stroke 3600 FA(2.5mg)+B6(25mg) for Stroke Prevention +B12(0.4mg) vs. (VISP) FA(0.02mg)+B6(0.2mg)
+B12(0.06mg)
Women’s Antioxidant CAD or 5449 FA(2.5mg)+B6(50mg) and Cardiovascular high risk +B12(1mg) Disease Study (WACS)
Study of the Effectiveness MI 12000 FA(2mg)+B12(1mg) of Additional Reductions in Cholesterol and Homocysteine(SEARCH)
Cambridge Heart MI or UA 4000 FA(5mg)Antioxidant Study(CHAOS 2)
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B-Vitamin Atherosclerosis Intervention Trial (BVAIT)
Study Design: randomized, double-blind,placebo-controlled trial
Subjects: 490 healthy men and women >40years old without preexisting CVD
Intervention: FA(5mg)+B6(50mg)+B12(0.4mg) daily placebo
Follow-up: 3 years1o outcome: rate of change of the right distal far
wall CCA IMT in computer image processed B-mode ultrasonograms obtained every 6 months
2o outcome: rate of change of coronary and aortic calcification by multirow CT detection
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Conclusions
More than 40 epidemiological studies consistently indicate that an elevated level of plasma homocysteine is associated with cardiovascular disease.
Arterial imaging data indicate that the risk for atherosclerosis appears to increase at a plasma homocysteine level of 8.5-9 µmol/L.
Accumulating data indicate causality between plasma homocysteine levels and cardiovascular disease, but solid evidence will have to await completion of ongoing randomized controlled trials.