Tuesday, December 28, 2010

Q and A.

My focus on stroke recovery has been near myopic for the last decade. I do professional talks and seminars, write general and coauthor journal articles about the subject. And there is also this blog. As you can imagine, all this writing attracts questions. I get questions from stroke survivors, caregivers and therapists. Many of the questions are heartbreaking but all of them are thought provoking. And I put a lot of effort into the answers.

Here are some examples...

The following question was from a 70-year-old M.D.

Q: I read with interest your wonderful work about spasticity and stroke. I suffered a stroke with left hemiplegia and spasticity about two years ago. I can walk slowly with a crane but I’m not very stable. Most annoying, however, is the spasticity in my elbow, wrist and fingers which is constantly flexed. The flexion increases during walking. I have weak dorsiflexion and severe plantarflexion of the big toe causing a shuffling gait. I am two years post; do you think there can be any improvement in gait and spasticity?

A: Thank you for the kind words about my work. Spasticity can only be reduced by reestablishing cortical control over the spastic muscles. Cortical control is reestablished through repetitive movement of the limbs. So, as much as you can move the arm, the better. Also, be careful not to let contracture set in. Because the joints of the arm are postured in the same place for a long periods of time (because of the spasticity) the cortical representation of those joints shrinks. Meanwhile, the soft tissue can also shrink. If enough soft tissue shrinkage has taken place this contracture can mean that no further gains can be made without surgery. So have an occupational or physical therapist develop a good and safe stretching program. Follow the program daily.

Also, consider electrical stimulation (ES). ES will move the joint through its range of motion--giving a good stretch. ES will also activate weak muscles, and ES has been shown to drive neuroplastic changes in the brain. Usually, once trained, you can do this at home, without a therapist. Generally the muscles that get ES are the weaker of the muscle groups (i.e. the finger/wrist extensors on the back of the arm.)

From a wife whose husband is ~ 1 year post stroke.

Q: I am always encouraging and try to be positive all the time; I ALWAYS say "WHEN you recover," never "IF you recover." Lately I wonder if I am just fooling him and me. EVERYTHING I read lately says global aphasia and apraxia have a very poor prognosis. Your book and your blog are very encouraging, but they do not address these issues very much.

A: Yes. You're right. And it is a major deficit in my book and in the generalized discussion about stroke recovery. "How do I know when I'm there?" How do we know when recovery has ended? I would start by making the argument that it's never ending. Because even if there is no further gains in terms of movement and communication, survivors still have to work hard just to tread water against the general decline of aging.

As you well know, your husband has had brain injury. I hate saying this because it seems like a clichΓ© and a cop-out, but you have a new normal. And he has a new normal. Having said that, I wouldn't give up. I would keep going as much as you both can tolerate, but with plenty of vacations (from the struggle) and rest. You may find yourself settling into some sort of "maintenance program" as a hedge against natural effects of aging. But don't be afraid to pepper the maintenance program with new stuff as it comes into view.

And the truth be told, full recovery, as defined as fully the way the stroke survivor was prior to the stroke, almost never happens.

The following question was from a PT

Q: I just read your article “Using Gait Speed as a Marker for Progress” (advance for PT and rehab medicine, March 8, 2010). I was wondering if it is still a valid test if assistive devices are used. Thanks for sharing the information!

A: My understanding is that the validity is only without an assistive device. Look at it this way; let’s say somebody walks a given speed without an assistive device, and then walks faster with an assistive device. If you accept that gait speed is an overall health indicator, then the assistive device would somehow make them healthier. Probably not a valid assumption. Having said that, there may be some importance to increased gait velocity even with an assistive device. In other words, although a bit of an empirical leap, if, over time somebody is walking faster with a cane, that would be seen as a good thing. In clinical research the question of testing gait speed with or without the assistive device (or orthotic for that matter) always comes up. Generally, gait speed without any orthotic or assistive device as more indicative of a true baseline.


Tuesday, December 21, 2010

Game Yourself Bright

Over the years I've had a lot of questions about recovery of cognitive function. And it's difficult question because it's not my area. Or is it?

My Dad. Super smart.
(I was adopted.)

The word cognitive is quite broad. According to our smart uncle Wikipedia the word cognitive refers to the brain's ability to do any of the following:

Memory, association, concept formation, language, attention, perception, action, problem solving and mental imagery.

Whether you're learning how to move better or learning mathematics or French or whatever, the processes are similar. Both involve physical change within the brain. Both happen in the 1 to 3 mm cortex of the brain, and both involve repetitive challenging practice. There is no separation between "cognitive" and "motor learning." 

But Wikipedia has it wrong, or rather, incomplete. Movement and cognition are inexorably linked. There is a term for it: Motor cognition. People say, that's impossible. Movement is what dumb jocks do. But, again, motor learning is learning, and motor cognition is cognitive. Ironically, Wikipedia has a page on motor cognition.

I have another entry where I argue that great athletes have great minds. It involves the great Jim Thorpe, so you know its good.

I think what most people are talking about when they talk about cognitive function is the ability to think clearly. What is it that they say about intelligence? It's is the ability to keep two thoughts in your head at the same time-- something like that. I think a lot of stroke survivors lament the loss of part of their ability to think. Unfortunately, many people assume that stroke survivors necessarily have lost mental capacity. But, of course, many have not. I can't tell you how many people I know that have had a stroke and they're still smarter than me. "Unfair!" I might yelp if I was petty, which I'm not. (Unfair!)

So what can one do to develop an increase in, let's call it, "intellectual capacity"?
It may very well be video gaming. There are many in physical rehabilitation who love the idea of using the Wii for physical rehab. They call it Wiihabilitation, because, cute. There's actually some serious questions about whether these games actually help physical recovery. But can gaming help you remember where you put your keys? Can it help you "keep two thoughts in your head at the same time"? It turns out it can.In fact, there's a game that aims to do exactly that. It's call the N-Back. Find the actual game here

NOTE: Some games don't work at all. Find my take on Lumosity here. Gaming may not be the best way to boost cognition.


Monday, December 13, 2010

Speed is Good.

The ability to get from one place to another is essential to every animal. The speed at which travel takes place is an essential to determining the success or failure of everything from food acquisition to escaping danger. Gait requires input from the brain, spinal cord, peripheral nerves, muscular power, and joint and cardiovascular health.
Because of all these systems are required to coordinate gait, gait speed is an indicator of the health of many physiological systems. In all animals, gait speed decreases with age. In humans, the speed of our mobility is predictive of so much more than if we will eat, or are eaten.
What is remarkable about testing gait speed is how much it reveals about people. Here is a laundry list.
  • A decline in gait speed predicts a decline in attention
  • An increase in gait speed predicts a substantial decline in mortality while a decrease in gait speed predicts an increase chance of mortality
  • Gait speed correlates well with functional ability, future health status and the patient’s confidence in their balance
  • Gait speed predicts where discharge will take place (home, SNF, etc.), the chance of hospitalization, an increase in medical costs, disability and mortality
  • Gait speed predicts the need for rehabilitation
  • Gait speed can be used to determine the effectiveness of a particular rehabilitation treatment option.
  • Gait speed can be used as a surrogate for quality of gait; the faster the walking, generally speaking, the higher the quality of gait.
And much more!

Note: Walking speed is not only predictive of decline, it can also predict improvement. The faster the better.

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