Central Neuropathic Pain With Dr. Charles Argoff

In the patient populations treated by neurologists, central neuropathic pain develops most frequently following spinal cord injury, multiple sclerosis, or stroke. To optimize pain relief, neurologists should have a multimodal and individualized approach to manage central neuropathic pain.

In this episode, Lyell K. Jones Jr, MD, FAAN, speaks with Charles E. Argoff, MD, author of the article “Central Neuropathic Pain,” in the Continuum October 2024 Pain Management in Neurology issue.

Dr. Jones is the editor-in-chief of Continuum: Lifelong Learning in Neurology® and is a professor of neurology at Mayo Clinic in Rochester, Minnesota.

Dr. Argoff is a professor of neurology and vice chair of the department of neurology, director of the Comprehensive Pain Management Center, and director of the Pain Management Fellowship at Albany Medical College in Albany, New York.

Additional Resources

Read the article: Central Neuropathic Pain

Subscribe to Continuum: shop.lww.com/Continuum

Earn CME (available only to AAN members): continpub.com/AudioCME

Continuum® Aloud (verbatim audio-book style recordings of articles available only to Continuum® subscribers): continpub.com/Aloud

More about the Academy of Neurology: aan.com

Social Media

facebook.com/continuumcme

@ContinuumAAN

Host: @LyellJ

Full episode transcript available here

Dr Jones: This is Doctor Lyell Jones, Editor-in-Chief of Continuum, the premier topic-based neurology clinical review and CME journal from the American Academy of Neurology. Thank you for joining us on Continuum Audio, which features conversations with Continuum's guest editors and authors who are the leading experts in their fields. Subscribers to the Continuum Journal can read the full article or listen to verbatim recordings of the article and have access to exclusive interviews not featured on the podcast. Please visit the link in the episode notes for more information on the article, subscribing to the journal, and how to get CME.

Dr Jones: This is Doctor Lyell Jones, Editor-in-Chief of Continuum: Lifelong Learning in Neurology. Today I'm interviewing Dr Charles Argoff, who recently authored an article on central neuropathic pain in the latest issue of Continuum covering pain management. Dr Argoff is a neurologist at Albany Medical College where he's a professor of Neurology, and he serves as vice chair of the Department of Neurology and program director of the Pain Medicine Fellowship Program there. Dr Argoff, welcome. Thank you for joining us today. Why don't you introduce yourself to our listeners? 

Dr Argoff: I'm Charles Argoff. It's a pleasure to be here and thank you so much for that kind introduction.

Dr Jones: I've read your article. Many of our listeners are going to read your article. Wonderful article, extremely helpful. Closes a lot of gaps, I think, that exist in our field about understanding central neuropathic pain, treating central neuropathic pain. You now, Doctor Argoff, you have the attention of a huge audience of mostly neurologists. What's the biggest point you would like to make to them, or the most important practice-changing advice that you would give to them?

Dr Argoff: I think it's at least twofold. One is that central neuropathic pain is not as uncommon as you think it might be, and it occurs in a variety of settings that are near and dear to a neurologist's heart, so to speak. And secondly, although we live in an evidence-based world and we want to practice evidence-based medicine - and I'm proud to have formerly been a member of the Quality Standard subcommittee, which I think has changed its name over time. And so, I understand the importance of, you know, treatment based upon evidence - the true definition of evidence-based medicine is using the best available evidence in making decisions about individual patients. And so, I would urge those who are listening that, although there might not be as robust evidence currently as you’d like, please don't not take the time to try to treat the patient in front of you o r at least acknowledge the need for treatment and work with your colleagues to address the significant neuropathic pain associated with that central neurological disorder. Because it can be life-changing in a positive way to make even a dent and to really work with somebody, even though not clear-cut always what's going to work for an individual patient.

Dr Jones: Well said. I'm glad you brought that up. So, to put it a different way, absence of evidence is not an excuse for absence of treatment. Right?

Dr Argoff: Exactly. And I think that, I hope that we would agree that especially in neurology, what we do is about as far from, ‘Yep, you've got strep throat, here’s that antibiotic that's going to work for you and all you have to do is take the medicine.’ I mean, most of what we do is nowhere near that. 

Dr Jones: It's complicated stuff. And this is a complicated topic. And I'll tell you, I learned a lot reading your article. I think most of us in neurology and medicine, when we hear the term neuropathic pain, it feels roughly synonymous with peripheral generators of that pain, such as diabetic neuropathy or posttraumatic neuralgia. But as you mentioned, there's central mechanisms for pain generation. How is it defined? What is central neuropathic pain?

Dr Argoff: It's defined as pain caused by a lesion or disease of the central somatosensory system . Though neuropathic pain in general is pain associated with the lesion of the somatosensory system; and to your point, that can be peripheral, which of course is outside the spinal cord, or brain or central, which is within the spinal cord or brain. And central neuropathic pain is defined specifically as pain caused by a lesion or disease of the central somatosensory system. That's either brain or spinal cord. But there's an interesting follow-up, and I'm going to ask if you could remind me because I know we're talking about definitions now, but I'll just bring something up and we can come back to it. What's interesting about that is that my - whoever 's listening, that's not to say that they're not connected. And in fact, they are very much connected.

And there's very new work, which I included in the article, down at Washington University in Saint Louis, that suggests you can actually affect central neuropathic pain by addressing peripheral input to the central nervous system. If you remember Ken Casey at the University of Michigan at the World Pain Congress in Vancouver, British Columbia many years ago, he ended his talk on pain with a limerick, of which the last line was, Remember, there ain't no such thing as pain without a brain. And so that kind of summarizes that.

Dr Jones: Well, and it goes both ways too, right? We know that there's some central sensitization that can happen with peripheral generators, right? So we really have to think about the whole circuit.

Dr Argoff: Yes. And that's been sometimes the bane of my existence as a colleague of others and a sometimes debater. Is the pain central? Is it peripheral? Well, it's everything. And it's important to know as many of the mechanisms and many of the targets that you could use for treatment so that you can affect the best outcome for your patients.

Dr Jones: Yeah, so - and you mentioned in your article what some of the common causes of central neuropathic pain are. What are the big ones in your experience? 

Dr Argoff: So, the biggest ones are spinal cord injury-related pain, MS-related pain - and I'd like to come back to a point and just if I do the third one - and central poststroke pain. And what struck me, I think Tim Vollmer published a survey about the incidence, the prevalence of ongoing pain in patients with multiple sclerosis. And it blew my mind several years ago because it was incredibly high. Like in this survey of MS patients who, you never hear about pain, you hear about these modifying treatments, all the wonderful expanses that have been made. I mean, like seventy something percent of people say they have moderate to severe pain. And when you think about how sensory processing occurs, it makes perfect sense that a demyelinating disorder is going to interrupt the flow of information for a person to feel normal. 

Dr Jones: Yeah, I think it's a good example of, there are things that we tend to focus on as clinicians where we worry about deficit and function and capacity. But if we're patient-centered and we ask patients what they care about, pain usually moves up higher on the list. And so, I think that's why we, it's maybe underrecognized with some of those central disorders, right?

Dr Argoff: I think so, and I and I think you hit the nail on the head that - and we're also trained that way. I tell this to my patients very often so that they are reassured when I examine them and I say, and I tell them that everything looked pretty OK. It's not a medical term, I understand that. Because what we do in a typical neurological exam, even if it's detailed, doesn't really address all the intricacies of the nervous system. So it's really a big picture and sensory processing and especially picking up se