WEDNESDAY, Aug. 11 (HealthDay News) -- A new study appears to dash hopes that the psychiatric drug lithium can benefit patients with amyotrophic lateral sclerosis (ALS).
The investigation involving 171 people with ALS was stopped early, in November 2009, because of high dropout rates from death, side effects or because patients thought the drug was ineffective.
ALS -- sometimes called Lou Gehrig's disease after the N.Y. Yankee who died of the condition -- is a progressive nervous system disorder that causes weakness in muscles, including those controlling breathing and swallowing. Median survival is three years, and only one drug -- riluzole -- is approved for ALS treatment in the United States.
Interest in lithium, which is often used to treat bipolar disorder, increased after a small Italian study was published two years ago, suggesting a beneficial effect for ALS patients, said Dr. Adriano Chio, an associate professor of neurology at the University of Torino, Italy. In that study, lithium was thought to have prolonged survival of 16 ALS patients, Chio said.
How might lithium have helped?
"Lithium could have an effect on one of the mechanisms supposedly related to the motor neuron degeneration in ALS, the accumulation of pathological proteins in the neuron," said Chio, who led the new study, noting subsequent research has not confirmed this effect.
In the new study, published in the Aug. 17 issue of Neurology, the drop-out rate, at 68 percent, was two times higher than the drop-out rate reported by previous trials, Chio said.
All participants received lithium, but in two different doses, and the drug was not well-tolerated by either group. Patients died or lost their autonomy at the same rate in both groups.
In an editorial accompanying the study, Dr. Carmel Armon of Tufts University said one limitation of the Chio study, which Chio a
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