Antioxidants in the treatment and Prevention of Coronary Artery Disease

Two recent medical studies in the use of antioxidants in the treatment of coronary artery disease have been "sensationalized" in the newspapers --

August 2001: Arteriosclerosis, Thrombosis and Vascular Biology, "Antioxidant Supplements Block the Response of HDL to Simvastatin-Niacin Therapy in Patients with Coronary Artery Disease and Low HDL"

November 29, 2001: New England Journal of Medicine, "Simvastatin and Niacin, Antioxidant Vitamins, or the Combination for the Prevention of Coronary Disease"

These reports were the same study, same authors and the same 160 subjects and the same data -- the first published from a treatment perspective and the other from the prevention perspective. The studies provide excellent information in the treatment of patients who have clinical coronary disease with low HDL.

The 160 subjects were put into 1 of 4 treatment groups of 40 each:

  1. Zocor (simvastatin) + Niacin
  2. Zocor + Niacin + Antioxidants
  3. Niacin + Antioxidants
  4. Placebo

The results were as predicted, Zocor + Niacin, lowered LDL and increased HDL (especially in pattern B patients will have an increase in HDL2).

The antioxidant groups received the following:

Vitamin E 800 IU
Vitamin C 1000 mg
Beta Carotene 25 mg
Selenium 100 mcg

The results of these groups could also be predicted because of the pro-oxidant dosages. None of the patients in the vitamin group were measured for oxidative potential. Based on a similar patient population as well as preventive patients without disease we see pro-oxidant effect in significantly lower doses.

It would be beneficial for the authors to repeat the study in larger number of patients and use substantially lower doses of vitamins and confirm antioxidant levels with individual testing.

The following were the outcomes based on coronary artery stenosis -- did the coronary artery disease continue to progress at its present rate:

1. Zocor (simvastatin) + Niacin -0.4 %
2. Zocor + Niacin + Antioxidants 0.7 %
3. Niacin + Antioxidants 1.8 %
4. Placebo 3.9 %

Over the 12 months all 3 treatment groups improved significantly over the placebo group. It would be interesting to see what the effect of individualized dosing of the antioxidants would have had on the results.

It is important not to extrapolate this data from a matched group of patients with predominately low HDL type to your individual type of lipid profile, as treatment and prevention programs will differ.

Blood tests for LDL, HDL and triglycerides is essential but homocysteine, Lipoprotein a, Apoprotein B, Fibrinogen, insulin levels, LDL subsets I, IIa, IIb, IIIa, IIIb, IVa, IVb, and HDL subsets HDL 2b, 2a, 3 a, 3b, 3c; C-reactive protein, Apo E isoforms, chlamydia pneumoniae titer, spectrox for oxidative potential etc, etc. These should be drawn before therapy so the proper therapy or prevention program can be designed. Periodic evaluation of the abnormal levels is necessary to confirm the appropriate doses.

EBCT scan in asymptomatic patients is still the best way to non-invasively measure and quantify the amount of coronary artery disease you have and to repeat it periodically to determine effectiveness of your treatment or prevention program.

The following is a prevention program recommended by the Genesis Center:

Non-invasive quantification of disease. The program uses serial EBCT to assess the segmental extent of disease and effectiveness of supplements in the treatment CAD. Symptomatic patients on cardiovascular or lipid medication are placed on supplements as an adjunct therapy. Because of the low variability of EBCT (< 10% CAS & < 8% CA) and the high predicted relative progression of CAD (mean 51%; 32% median in symptomatic pts), EBCT is used as an accurate assessment of outcome.

In identifying the cause of CAD, eg hyperhomocysteinemia, ALP’s and treating the cause with nutritional supplements, many patients have documented regression and reversal of CAD.

The premise of the nutritional treatment is two fold; first to improve cardiovascular and endothelial function by providing therapeutic amounts of vitamins, minerals, trace elements, EFA’s that are known to be essential to cardiovascular cellular function. Second, is to treat identified genetic or probable cause of CAD with specific add-on supplements in therapeutic amounts, ie-individualized therapy.

The following are examples of science based treatment of certain aspects of coronary artery disease:

Hyperhomocysteinemia: vitamins B6, folic acid, B12 and Betaine reduce homocysteine in a dose-related response to improvement in the methylation cycle. A few patients require N-acetylcysteine to reduce the homocysteine level below the therapeutic goal of 8.5 Umol/L. Below 8.5 minimal damage occurs to the endothelium. Some patients with a normal fasting homocysteine may have a decreased clearing of Hcy and are identified with a methionine-loading test.

C-Reactive Protein: aspirin in amounts of 81 to 325 mg a day are used to reduce CRP.

Oxidation of LDL: antioxidants vitamin A, C, E, & Beta-carotene are provided initially in empirical therapeutic amounts and subsequent dosing is based on intracellular oxidation studies by a lymphocyte proliferation test. Dosing is increased until the oxidative potential is above the 75th percentile. Obtaining optimal oxidation status is a critical aspect of the therapy, as patients currently taking other supplements should stop these products to avoid the pro-oxidant effects of excess antioxidants.

Platelet function: in addition to aspirin, 300 mg of omega-3 oil a day provides as 120 mg docosahexaenoic acid and 180 mg as eicosapentaenoic acid. There are many positive functional reasons but in cardiac patients the main purpose is to decrease the platelet synthesis of thromboxane A2, ie decrease platelet aggregation.

Endothelial function: can be grossly assessed with brachial artery studies but is initially treated with calcium, magnesium and occasionally with arginine HCL.

Hyperfibrinogenemia: is treated with NAC and all of the above to reduce fibrinogen levels and blood viscosity.

ALP’s: Atherogenic Lipid Profile (pattern, B, type B hyperlipidemia) is treated with 1.2 - 1.6 gm/day of no-flush niacin (inositol hexa-niacinate) or Niaspan by prescription at 2 to 3.5 gm/day. Berkeley LDL-GGE blood test is used to monitor therapeutic effectiveness.

Lp (a): hyperlipoproteinemia with Lp(a) is treated initially primarily with NAC but generally resolves as dyslipidemia is corrected.

Hyperinsulinemia: (syndrome X) is treated best with omega-3, weight loss and although provided in the supplements only a few patients will respond to 400 mcg of chromium or the addition of 10 mg of vanadium sulfate and 200 mg alpha-lipoic acid per day.

Occasionally patients with syndrome X will require insulin sensitizers’, ie prescription drugs such as thiazolidinediones (Avandia and Actos) and possibly a sulfonylurea or biquanide type drug. These patients need diet instruction and diabetic teaching.

Although there numerous other concomitant metabolic disorders, eg hypertriglyceridemia and selected intracellular deficiencies, therapy should be individualized.

David Martin, Pharm.D., FACN CNS

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