Reading different threads & blogs, I want to see if I've processed correctly best practices to get as accurate a SFEMG reading as possible:

1. have heat running in the car while being driven to the appointment
2. dress warmly to compensate in case the testing room is not sufficiently warm
2. stay well hydrated
3. go off mestinon one week or so in advance
4. go off caffeine or chocolate or other stimulants
5. wear myself out with exercise the day before (unless already debilitated)

Is there a general consensus that these are good preparation methods? Any other suggestions on what to do or not do?

Thanks

Nightshade foods (potato, tomato, eggplant - yuck - tobacco and peppers) are cholinesterase inhibitors - to some unknown degree - just as caffeine and Mestinon are.

MG often has a worse 2-day rebound after doing things. Though, I wouldn't push the envelope if I were you with exercising. That could be dangerous for you.

Subcutaneous fat of 9 mm (millimeters) can reduce an EMG signal by 80%. Yeah, 80. A good test also relies on the experience of the technician/doctor too.

Just relax and focus on helping the doctor get the best results. If they're testing your forearm muscle, for example, the doctor will say to lift a finger a certain degree so that they can get the best signal.

I hope it goes really well. When is the test?

Annie

Great information, Annie! The appointment is Feb 4. I've been told he'll do thorough testing but haven't been told whether it's repetitive stimulation testing or SFEMG or even tensilon. I'm preparing for any event as best I can.

Anyone, any additional tweaks or recommendations? (See next post)

Best Practices in Preparing for SFEMG

In considering these guidelines, LISTEN TO YOUR BODY to avoid overly distressing your system. These guidelines are not meant to take the place of doctor's advice.

Find a technician/doctor experienced in SFEMG to increase chance of getting accurate test results.

Up to 14 days prior to testing...

1. Discontinue pyridostigmine/mestinon. (See Note re: cholinesterase inhibitors)
2. Avoid nightshades (e.g. potato, tomato, eggplant, tobacco, peppers, goji berries,...) (See Note re: cholinesterase inhibitors)
3. Avoid caffeine, chocolate, tobacco and other stimulants

Up to two days prior to testing...

4. Stay well hydrated
5. Wear yourself out with exercise (unless already debilitated). Use best judgment to avoid overly distressing your system

On Appointment Day...

6. have heat running in the car while being driven to the appointment
7. dress warmly to compensate in case the testing room is not sufficiently warm
8. Don't be too alarmed if the doctor doesn't test your weakest muscle since other factors may influence which muscles to test (e.g. Subcutaneous fat of 9 mm (millimeters) can reduce an EMG signal by 80%)
9. During test, relax & help the doctor get best results by following instructions carefully (e.g. If testing forearm muscle, the doctor may say "lift this finger a certain degree to get the best signal.")

*Note: A report indicates cholinesterase inhibitors remain in a person's system 2-14 days after discontinuation & may negatively affect SFEMG test results. See Link: http://www.ncbi.nlm.nih.gov/pubmed/2540433

Good, I'm glad you saw that article by Howard in the other post. Again, it's a very small study, so you might want to reference that or people might stay off of Mestinon for 2 weeks and harm themselves by doing so! It's not a good idea to follow a study. Patients should follow their disease and their doctor's advice. Plus their own instincts!

Plus, you should reference the actual studies via a URL. I don't have time right now to dig up the EMG info (SubQ fat, etc.).

Annie

Annie,
I'll adjust wording & links to reflect what you've told me, as well I'll search for the study referencing subq fat.

Anyone else with ideas or concerns or questions about the content?

Hmm, it's not really part of preparing, but I would like to say to people: the needle shouldn't be painful while it's in. If it is, tell the doctor and ask him to move it.

I can't decide if this is sad or funny.

People are preparing for a medical test, which is meant to diagnose their illness, or in other words give their physicians the tools required to give them what is likely to be effective treatment. (as why else should they care about the name of their illness?).

Some are even ready to risk themselves or get their illness out of control for that.

One can't wonder while reading this:

A. what does it say about this test?

B. what does it say about the physicians who are doing it?

C. what does it say about the physicians who are interpreting it and making medical decisions based on it?

Or as I have said many times in various forums (including discussions with neurologists)-The SFEMG is a test with a very low sensitivity and specificity, very inaccurate and very operator-dependent. It's accuracy and reliability have never been tested in patients with less typical forms of the disease. Using this test as the "gold standard" for the diagnosis of MG leads to nearly 50% of the patients with a clinical picture of myasthenia (and no alternative diagnosis) being left out with no diagnosis and no treatment (not even adequate supportive care).

This thread makes me even more convinced that its time to ban this test, or at the most realize its significant limitations and stop using it as the "gold standard" for the diagnosis of this illness.

There is no way to "prepare" for a medical test.
Some people who have a heart attack will have a completely normal EKG. They can't "make" their EKG be abnormal, no matter what they do.
Some people with leukemia will have a completely normal blood count.
Some tests require certain provocations, withholding of medications, but those are done by the physician doing them not by the patient.
You do not prepare for an exercise stress test, meant to see if you have coronary disease by stopping your medications and jogging prior to the test.
You do not prepare for a metacholine challenge test by inhaling fumes prior to reaching the clinic.

In the early days of my illness, I had a neurologist-an MG expert and also one of the best SFEMG performers. He had no doubt that I have MG, but had to find proof for that.
He told me that without a diagnostic SFEMG he can commit himself to this diagnosis, even though clinically he has no doubt and he has no other alternative diagnosis.

I agreed by his advise to stop all treatments and medications for a few weeks, as he promised me it will be safe and there will be no ill effects ( I still don't know today what effect it had on the course of my illness).
He told me to call him whenever I feel that I am having myasthenic weakness. He came in the late evening to do a SFEMG. He tried numerous times to get the "proof" he required, but as all my SFEMGs were repeatedly completely normal he started doubting himself. He no longer thought my clinical symptoms were myasthenic. He started thinking I have "emotional problems". Even when I crashed in front of eyes and my O2 sats dropped, he decided that I was just "anxious" and the Pulse Oxymeter was unreliable.

Trust me, he did everything possible to "make" my SFEMG positive. He strictly followed all your "best practice" guidelines.

Another SFEMG expert did a very elaborate test when I was (by all reasonable criteria) in myasthenic crisis due to withholding of a medication by the advise of my wonderful expert neurologist. He too got a completely normal SFEMG. It was therefore decided (by the same wonderful MG expert) that I was in "remission", yet not "aware" of it.

This actually fits the "alice in wonderland" logic. If patients can "prepare" for a test, and thus make it positive, why can't they be in "remission" without being "aware" of it?

Just like those cartoons in which bugs bunny walks in the air and doesn't start falling, until he realizes what has happened.

It's all up to us, the patients. If our SFEMG is not diagnostic then obviously we didn't prepare well for it. If we are nearly paralyzed and unable to breath on our own it's because we are not "aware" that we are actually healthy and strong.

If we dare criticize this "alice in wonderland" logic, it's obviously because of our mental problems which make us not only incapable of understanding that we do not have an insight into our own illness (as opposed to wonderful excellent MG experts), but also lack the ability to understand their complex way of thinking.

Since I have been home from my fall, I have been calling the SFEMG facility everyday for a cancellation since i have to wait on the list until June. Well, it must have been my lucky day. Someone cancelled and I got bumped up to Feb 26th. So I am going to use the above list to prepare. I am seronegative so this test is crucial for my diagnosis. I just started mestinon. I am afraid they will not progress with my treatment -- cellcept, thymus scan etc -- unless they get some positive results. Should I ask them to repeat the antibody test? They were last done in early November and were negative.

thanks, kathie

First I tested positive for modulating antibodies then neutral and then negative, so you might want to take the test again. When I tested negative I was drinking a lot of caffeinated sodas. The last test was positive for modulating antibodies and the test I took was the anti ach receptor antibody test.