Amyotrophic lateral sclerosis (ALS) – commonly known as Lou Gehrig’s disease or motor neuron disease – is a neuromuscular disorder. It’s caused when the motor neurons that send electric "messages" from the brain to the spinal cord (upper motor neurons) or from the spinal cord (lower motor neurons) to the muscles are slowly being destroyed. These neurons are responsible for muscle movement.
When the messages don’t get through from the spinal cord, the muscles eventually lose strength and waste away. This process is called atrophy or amyotrophy. When signals from the brain to the spinal cord are blocked, the muscles become stiff and slow. This is called spasticity.
It is the most common form of neuron disease, and approximately 2 out of 100,000 people each year are newly diagnosed with ALS. It’s more common in men than women, with symptoms usually appearing between the ages of 50 and 75. About 10% of people with ALS have a family history of the disease. The average life expectancy is 2 to 5 years after diagnosis.
The causes of ALS are starting to be understood. Multiple factors are at play, both genetic and environmental. At least 16 different genes are involved in ALS. No single environmental factor has been proven to cause it. ALS does not appear to result from exposure to heavy metal or viral infection alone. Even blocking the neurotransmitter glutamate does not stop the disease.
Genetic counselling and then possible genetic testing should be offered to all people diagnosed with ALS.
Because the exact causes of the disease haven’t been pinpointed, ALS cannot be prevented or cured. The treatment is focused on managing the symptoms and allowing the patient to have a good quality of life. Many health care specialists will be involved, including the family doctor, home nurses, a neurologist, respiratory therapist, physical therapists, occupational therapists, nutritionists, and social workers.
Medications are available, however, that may slow the progress of the disease and that deal with some of the symptoms.
Riluzole* is a medication that appears to prolong the life of some people with ALS by at least a few months. Riluzole seems to do 2 things: block sodium and calcium channels to decrease the effects of glutamate and increase its clearance.
Another medication, edaravone, has shown benefits in slowing the progression of ALS. This medication is an antioxidant and is believed to decrease oxidative stress, which is thought to be part of the process that kills neurons in people with ALS.
Muscle spasms – and sometimes cramps – can be controlled with the medications baclofen or diazepam. Medications can also be used to lower the amount of saliva that’s made to help people who’ve lost the ability to swallow it.
To avoid choking or inhaling food and saliva into the lungs, a feeding tube might need to be placed into the stomach. People with difficulty breathing will eventually have to go on a respirator. Physical therapy can help people maintain strength in their muscles and control muscle contractions. Speech therapy can help people with speech and swallowing difficulties. Many will benefit from a motorized wheelchair and devices that allow communication through eye movements.
Although a person’s physical state worsens, their mental capacity does not. To cope with the progression of the disease, good emotional support from family and friends is important. Support groups can also be helpful: the ALS Society of Canada can be contacted by phone (1-800-267-4257) or email (alscanada@als.ca), or accessed online at www.als.ca.
End-of-life care is an essential component of the care for someone with ALS. The person should choose how they wish to be treated in the late phase of the disease. This is usually done by filling advance directives.
*All medications have both common (generic) and brand names. The brand name is what a specific manufacturer calls the product (e.g., Tylenol®). The common name is the medical name for the medication (e.g., acetaminophen). A medication may have many brand names, but only one common name. This article lists medications by their common names. For information on a given medication, check our Drug Information database. For more information on brand names, speak with your doctor or pharmacist.
All material copyright MediResource Inc. 1996 – 2025. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Source: www.medbroadcast.com/condition/getcondition/Amyotrophic-Lateral-Sclerosis
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