Amyotrophic Lateral Sclerosis (ALS)
Amyotrophic lateral sclerosis (ALS) is a progressive neurological disease that causes the degeneration of motor neurons.
Motor neurons are nerve cells in the brain and spinal cord that are responsible for controlling voluntary muscle movements. When motor neurons deteriorate and die, the brain can no longer initiate and control muscle movements. This causes muscles to gradually weaken and waste away (atrophy).
People with ALS can lose their ability to move, speak, eat, and breathe. Most people with the disease will die from respiratory failure, usually within three to five years of symptom onset. However, 10 percent of people survive 10 years or more. While progressive weakness and muscle atrophy are the hallmarks of ALS, people with this disease also may experience mild to moderate abnormalities of thinking, with a small number of patients experiencing dementia.
How common is ALS?
It is estimated that more than 20,000 Americans may be living with amyotrophic lateral sclerosis at any given time. Based on U.S. population studies, approximately 5,600 people are diagnosed with ALS each year, which is equivalent to about 15 new cases per day.
Who gets ALS?
ALS is most often a disease of middle to later life, with 55 being the average age of diagnosis. However, age of onset is quite broad, with some people experiencing initial symptoms in their 20s, while others have disease onset in their 90s. ALS affects all racial and ethnic groups. Men are more affected than women.
In about 10 percent of ALS cases there is a family history of the disease. A growing number of genes have been shown to cause ALS; in most cases, inheritance is autosomal dominant. This means that a person carrying the genetic mutation has a 50 percent chance of passing it on to their children. The specific gene causing inherited ALS can be identified in slightly more than 50 percent of cases. However, in about 90 percent of cases in the U.S., ALS is sporadic, meaning it occurs apparently at random in people. Military service and smoking are two of a very small number of risk factors for ALS.
How is ALS diagnosed?
Amyotrophic lateral sclerosis can be difficult to diagnose because there is no single test that can identify the disease. Diagnosis is done through a clinical examination and a series of tests, which rule out other diseases with similar symptoms. The best way to diagnose ALS is to be examined by an experienced physician who specializes in neuromuscular diseases.
Diagnostic tests may include:
- Neurological examination
- Electrodiagnostic tests, such as electromyography and nerve conduction velocity
- Lumbar puncture (spinal tap)
- Imaging tests, such as MRI
- Blood tests
Early symptoms of ALS can vary depending on the muscles affected and may be so subtle that they are overlooked. Progressive muscle weakness and paralysis are experienced by everyone with ALS, but with varied rates and patterns of progression.
Symptoms of ALS include:
- Muscle weakness and fatigue in your arms, hands, legs, or feet
- Muscle twitches (fasciculations)
- Tight and stiff muscles (spasticity)
- Muscle cramps
- Slurred speech
- Change in vocal pitch
- Difficulty chewing or swallowing
- Difficulty breathing
- Dropping objects
- Difficulty performing simple tasks requiring manual dexterity, such as buttoning a shirt
- Exaggerated reflexes
- Uncontrollable periods of laughing or crying
ALS does not affect your ability to see, smell, taste, hear, or recognize touch. People usually maintain control of their eye muscles and bowel and bladder functions. Occasionally, memory problems or changes in one’s behavior or personality can affect people with ALS and may even begin before symptoms of weakness.
Riluzole is currently the only FDA-approved drug used to treat ALS. It is believed to reduce damage to motor neurons and slow progression of the disease by decreasing the release of the neurotransmitter glutamate. Riluzole does not stop or reverse motor neuron damage, but clinical trials have shown that it extends survival and may delay the need for breathing support.
In addition, Nuedexta has been recently approved to treat a rare but uncomfortable symptom of ALS called pseudo bulbar affect. Patients with this symptom experience uncontrolled episodes of laughing or crying; this is very well treated by Nuedexta.
Other medications may be prescribed to relieve fatigue, cramps, pain, spasticity, excessive saliva, depression, and sleep disturbances.
Quality of life, independence and functional capacity can all be treated with a variety of equipment and therapies. The Gregory W. Fulton ALS Center at Barrow Neurological Institute at Dignity Health St. Joseph’s Hospital and Medical Center employs many different specialists with this goal in mind, including:
- Physical therapists
- Speech therapists
- Occupational therapists
- Respiratory therapists
- Social workers
- Mobility specialists
The goal of the Fulton ALS Center is provide ALS patients with the highest possible quality of life throughout their disease course, and to perform cutting edge research to improve ALS patient care.
Request an Appointment with an ALS Specialist
Call (602) 406-6262