Jeff, I say this with all due respect.
I feel it's important to address two points:
Bulbar symptoms can show-up on EMG's because those are from bulbar neurons . . . that is . . . neurons from the brainstem and those neurons are still considered lower motor neurons. Upper motor neurons are those neurons from the cerebral cortex . . . and again . . . damage to those neurons will not show-up on an EMG. Bulbar symptoms can originate from upper motor neurons as well (just like limb-onset symptoms can), and if they do, will not show-up on an EMG. That is when you are diagnosed with pseudobulbar palsy (upper motor neuron death causing the bulbar symptoms). I assure you that I am correct.
The other point I want to address deals with an early EMG being clean with ALS. In the early stages of ALS, it is very focal (there are many studies that show this and I would be more than happy to share those with anyone who wishes to see them). Therefore, not all limbs may be affected in the very early stages of ALS, when it would not meet the diagnostic criteria of ALS. If an unaffected limb is needled, then the EMG will be clean. This would happen especially if the EMG is not thoroughly done. Eventually that unaffected limb will assuredly be affected and a later EMG would then be dirty. Again, however, if symptoms are due to upper motor neurons, the EMG will be clean . . . and if clinical signs warrant it, the person will be diagnosed with PLS or at the very least, upper motor neuron dominant ALS.
I respect you a great deal, Jeff (along with everyone else on this forum) and certainly hope that we never have another exchange like that again. I really feel bad about it and I hope there are no hard feelings.
Al, Cindy and David: I must apologize to you too.