But new finding needs additional research to confirm the link, experts caution
WebMD News from HealthDay
By Steven Reinberg
HealthDay Reporter
MONDAY, Nov. 10, 2014 (HealthDay News) -- Medications commonly used to lower blood pressure might also lower the risk of developing amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, researchers suggest.
In fact, those who took particular doses of the medications known as angiotensin-converting enzyme inhibitors (ACE inhibitors) for more than four years appeared to reduce their risk of ALS by 57 percent, the researchers found.
"ALS is the most common form of motor neuron disease," said lead researcher Charles Tzu-Chi Lee, an associate professor in the department of public health at Kaohsiung Medical University in Taiwan. Neurons are nerve cells, and motor neurons are the nerve cells that control voluntary muscle movements, according to the National Institute of Neurological Disorders and Stroke (NINDS).
"Most patients with ALS die within three to five years after the onset of symptoms. However, the causes of ALS are still unclear and only 5 to 10 percent of cases are directly inherited from a person's parents," Lee said. "There is still no cure or prevention for ALS."
Lee said that this study only shows an association between ACE inhibitors and the reduced risk of ALS. It wasn't designed to prove that taking ACE inhibitors caused the decreased risk of ALS. "Clinical studies are required to assess the possibility of using ACE inhibitors for preventing and treating ALS," he said.
The report was published Nov. 10 online in JAMA Neurology.
ALS causes progressive atrophy of muscle, leading to difficulty speaking, swallowing and breathing, according to Lee.
For the study, Lee's team compared over 700 people with ALS to nearly 15,000 people without the condition to see if ACE inhibitor use had any effect on the development of ALS. The people with ALS had been diagnosed between January 2002 and December 2008, the study noted.
Among those with ALS, 15 percent reported using ACE inhibitors in the two to five years before their ALS diagnosis. Among those without ALS, about 18 percent said they took ACE inhibitors, according to the study.
The researchers found that people who took ACE inhibitors at a lower dose had a 17 percent reduced risk of developing ALS compared to those who didn't take the drugs. Those who took a higher dose for more than four years had a 57 percent reduced risk, according to the study. The dose amount varied depending on the drug used, although the researchers found the results were dose-dependent. That means the association was stronger when higher doses of ACE inhibitors were given, according to the study.
The authors don't know exactly how ACE inhibitors might protect against ALS, though they have several theories. For example, they pointed out that ACE inhibitors have been linked to a protective effect in other diseases that damage nerve cells, such as Alzheimer's and Parkinson's disease. So, perhaps ACE inhibitors are somehow shielding nerve cells from damage, they suggested in the study.
source : Common Blood Pressure Drug May Lower Risk For Lou Gehrig's Disease: Study
