A number of disorders may mimic ALS; examples include:

• Myasthenia gravis.
• Lambert-Eaton myasthenic syndrome.
• Lyme disease.
• Poliomyelitis and post-poliomyelitis.
• Heavy metal intoxication.
• Kennedy syndrome.
• Adult-onset Tay-Sachs disease.
• Hereditary spastic paraplegia.

Can ALS be mistaken for something else?

ALS is commonly misdiagnosed as cerebrovascular disease, cervical myelopathy, vertebral disc herniation, radiculopathy, neuropathy, and myasthenia gravis. Misdiagnosed patients may endure surgery or treatment for the wrong diagnosis that can lead to unnecessary harm.

How many times is ALS misdiagnosed?

How often the first diagnosis of ALS wrong and the problem turns out to be something else? In up to about 10 to 15% of the cases, patients get what we call a false-positive. That means they are told they have ALS, but, in the end, another disease or condition is discovered to be the real problem.

What can mimic ALS on EMG?

Multifocal motor neuropathy with conduction block is another mimic of ALS. It presents by onset of focal motor weakness, usually in a distal upper extremity, accompanied commonly by fasciculations and cramps.

Can you have ALS and not know it?

The initial symptoms of ALS can vary from person to person. For many, the onset of the disease is so subtle that the symptoms are often overlooked. However, as symptoms begin to develop into more obvious muscle weaknesses and/or atrophy, physicians are more likely to suspect ALS in their patients.

How to Give Less Bad News: A Guide to ALS Mimics - David Ivanick, MD

How do you rule out ALS?

How is ALS diagnosed?

1. Electromyography (EMG) is a recording technique that detects electrical activity of muscle fibers and can help diagnose ALS.
2. A nerve conduction study (NCS) measures the electrical activity of the nerves and muscles by assessing the nerve's ability to send a signal along the nerve or to the muscle.

Does ALS start abruptly?

As I have mentioned before, ALS does not start abruptly. Consider Lou Gehrig. At first he never dreamed he had a disease. That's the same problem all of our patients face.

Can an EMG rule out ALS?

Nerve conduction studies and needle electromyography (EMG) are useful for confirming the diagnosis of ALS and for excluding peripheral conditions that resemble ALS. Laboratory tests are performed primarily to rule out other disease processes; results generally are normal in ALS.

How accurate are EMG for ALS?

The technique appears to identify people with ALS at about 96% accuracy. And, rule out ALS, 84%. Now, a growing number of neurophysiologists are using combined methods to identify people with ALS. The strategy reduces the number of muscles that need to be checked using electrophysiological methods – including EMG.

Does abnormal EMG always mean ALS?

A normal EMG result will often result in a diagnosis of primary lateral sclerosis (PLS), but does not rule out the possibility of ALS developing later.

What disease has the same symptoms as ALS?

Primary Lateral Sclerosis (PLS)

PLS is similar to ALS, but it affects only upper motor neurons. It causes weakness and stiffness in the arms and legs, a slowed walk, and poor coordination and balance. Speech also becomes slow and slurred. Like ALS, it usually starts in people 40 to 60 years old.

What comes first in ALS muscle weakness or twitching?

What are the symptoms? The onset of ALS may be so subtle that the symptoms are overlooked. The earliest symptoms may include fasciculations (muscle twitches), cramps, tight and stiff muscles (spasticity), muscle weakness affecting a hand, arm, leg, or foot, slurred and nasal speech, or difficulty chewing or swallowing.

Can a brain MRI rule out ALS?

Preliminary studies suggest that MRI may help identify signs of amyotrophic lateral sclerosis (ALS) earlier, but larger studies conducted over a longer time are needed. ALS is a rapidly progressing neurodegenerative disease that causes muscle wasting and eventual death.

Where do ALS muscle twitches start?

The effects of ALS vary. Some people may have more advanced symptoms depending on the motor neurons affected. One common symptom is twitching and cramping within your muscles, including places like your legs and shoulders.

What is the most common misdiagnosis?

Cancer. Cancer misdiagnosis is the most common misdiagnosed disease of all. Different types of cancers are misdiagnosed as well which is why it's important to have a complete medical history of the patient, adequate time to evaluate the patient, and complete information of symptoms and medications.

Does ALS show up on blood work?

Blood test: Blood tests can look for early signs of ALS and rule out other conditions.

Can Spinal Tap show ALS?

Genetic testing for ALS is usually only done when someone else in the family has ALS. Occasionally, a lumbar puncture (also called a spinal tap) may be required. For this test, a small needle is inserted into the lowest part of the spine (below the spinal cord) to remove fluid which will be examined for abnormal cells.

Can MRI detect ALS?

Scans such as magnetic resonance imaging, or MRI, can't directly diagnose ALS. That's because people with the condition have normal MRI scans. But they are often used to rule out other diseases.

What does ALS feel like at first?

ALS often begins with muscle twitching and weakness in a limb, or slurred speech. Eventually, ALS affects control of the muscles needed to move, speak, eat and breathe. There is no cure for this fatal disease.

How frequent are Fasciculations in ALS?

The distribution of fasciculation in ALS and non-ALS muscle groups is shown in Fig. 1B. Fasciculation was detected in 72.8% (1217/1672) muscle groups in ALS patients, which was significantly higher than that in muscle groups from non-ALS patients (18% [185/1026]) (P

Does a muscle biopsy show ALS?

A muscle biopsy can be used to diagnose ALS, but is more likely to be used to eliminate other possible diagnoses and to monitor the progression of the disease by comparing muscle biopsies taken over the lifetime of the patient.

Is CPK elevated in ALS?

Creatine kinase, a marker of muscle damage, is significantly elevated in people with amyotrophic lateral sclerosis (ALS), and higher levels of this protein correlate with better survival rates in patients, a recent study found.

Can ALS progress in a week?

With ALS, you may first have weakness in a limb that occurs over a few days or, more often, a few weeks. Then a few weeks or months later, weakness develops in another limb. For other people, the first sign of a problem may be slurred speech or trouble swallowing. As ALS progresses, more and more symptoms are noticed.

How long can you have ALS before diagnosis?

Total diagnostic time, defined as the time from symptom onset to confirmed diagnosis, has been reported to range from eight to 15 months in ALS (1–8).

When do you usually get ALS?

Most people who develop ALS are between the ages of 40 and 70, with an average age of 55 at the time of diagnosis. However, cases of the disease do occur in people in their twenties and thirties. ALS is 20% more common in men than women.