Folate May Be Risky After Heart Bypass
May Want to Hold Off On Starting Some Vitamin Supplements After Angioplasty
April 3, 2003 (Chicago) -- After undergoing procedures to open blocked arteries many people commit to healthy lifestyles: exercise, a balanced diet and -- many times - vitamin supplements. But not all vitamins are heart healthy and results of a new study suggest that one combination -- folate plus vitamins B6 and B1 -- might do more harm than good.
This new study actually flies in the face of previous research which suggested that folate supplements might actually benefit some heart patients after surgery.
This study of over 600 patients who had blocked arteries propped open with tiny, flexible mesh tubes, a procedure called stenting, found that those who took a high dose folate supplements for six months after the procedure were more likely to have stent failure than those who took a placebo. Making the matter worse, the patients that took the vitamin supplements actually had an increase in complications.
Helmut Lange, MD, of Kardiologische Praxis, in Bremen, Germany said that patients who took the vitamin supplement mix had clear evidence of new narrowing in the stented arteries: the arterial opening had shrunk compared to stented patients who didn't take the folate. Outright stent failure, which is called restenosis, occurred in 35% of the patients put on the vitamin supplements, while the stent failure rate in patients who didn't take the supplements was 27%.
Moreover, 16% of folate-treated patients needed subsequent procedures to re-open the artery compared to 11% of the patients in the group that didn't take the folate supplements.
The research was reported at the American College of Cardiology 52nd Annual Scientific Session held here this past week.
Lange tells WebMD he was actually surprised by the study results since an earlier study suggested that taking vitamin supplements could "reduce the rate of restenosis by half."
After those earlier results were reported some cardiologists began recommending folate supplementation for stent patients. But Lange says results of this new study suggest that patients should be advised against starting folate supplementation after undergoing stenting.
Folate supplements decrease blood levels of homocysteine, which is considered a risk factor for cardiovascular disease. "So the hypothesis was that administration of a homocysteine-lowering vitamin combination would be protective," says Lange.