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Antioxidant Alpha Lipoic Acid Provides Relief for Diabetic Polyneuropathy: Presented at ADA
By Jerry Ingram
NEW ORLEANS, LA -- June 20, 2003 -- The antioxidant alpha-lipoic acid administered over 3 weeks at a dose of 600 mg/day reduces symptomatic polyneuropathy in patients with diabetes, researchers reported here on June 15th at the 63rd Scientific Sessions of the American Diabetes Association.
"We saw significant improvements in subjects and feel quite optimistic about the potential therapeutic use of this agent," said Dan Zeigler, MD, a clinical researcher at Heinrich Heine University in Dusseldorf, Germany.
Dr. Zeigler and colleagues conducted a meta-analysis of research from the database of VIATRIS GmbH, a pharmaceutical company based in Frankfurt, Germany, to determine the efficacy and safety of alpha-lipoic acid in diabetic patients with symptomatic polyneuropathy. All of the data came from randomized, double-masked, placebo-controlled, parallel-group trials using alpha-lipoic acid infusion.
Four trials (ALADINI, ALADIN III, SYDNEY, NATHAN II) involved 716 patients treated with alpha lipoic acid and 542 treated with placebo. The researchers analyzed the data for comparative differences in Total Symptom Score (TSS) and in its individual components, as well as for comparative differences in Neuropathy Impairment Score of the lower limbs (NIS-LL).
After 3 weeks, alpha lipoic acid had a 24.1% improvement over placebo (geometric mean with 95% confidence interval) for TSS and 16.0% for NIS (both P<0.05).
Response rates were 52.7% in patients treated with alpha lipoic acid and 36.9% in those on placebo (P<0.05).
Among individual components of the TSS, pain, burning, and numbness decreased to a greater extent with [alpha]-lipoic acid compared with placebo. On the NIS-LL, alpha lipoic acid had a better results pinprick and touch-pressure sensation and ankle reflex scores than placebo (all P<0.05).
The rates of adverse events did not differ between the groups.
The investigators concluded that treatment with alpha lipoic acid is safe and "significantly improves both neuropathic symptoms and deficits to a clinically meaningful degree in diabetic patients with symptomatic polyneuropathy."
[Study title: Treatment of Symptomatic Diabetic Polyneuropathy with the Antioxidant [Alpha]-Lipoic Acid: A Meta-Analysis. Abstract 850-P]
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