Tag Archive for: concussion

Post-Concussion POTS

A recent study published in 𝘊𝘩𝘪𝘭𝘥 𝘕𝘦𝘶𝘳𝘰𝘭𝘰𝘨𝘺 𝘖𝘱𝘦𝘯 sought to understand autonomic dysfunction in kids after concussion.⁣

In recent years, more clinicians have become aware of autonomic dysfunction in patients after concussion, with many showing positive diagnostic findings resembling orthostatic hypotension and Postural orthostatic tachycardia syndrome.⁣

While some of the symptoms of concussion and POTS overlap, there are likely important differences that make treatment for each unique.⁣



Post concussion autonomic dysfunction tends to be very responsive to neurologic rehabilitation techniques, and can often be self-resolving as the brain heals.⁣

More traditional POTS tends to have elements of autoimmune and/or neurometabolic causes that may make treatment more complicated and less likely to self-resolve.⁣



Knowing the background behind these cases can dictate effective treatments for these challenging conditions. ⁣

Concussions and Helmets

Concussions and Helmets

A lot of time and resources have gone into methods to reduce concussion in sports. There’s a lot of speculative stuff out there, but most of it has yet to be proven in a meaningful way.⁣

The biggest myth is that newer generation helmets can protect against concussion in football. The evidence on this is really poor. ⁣



The problem is that a helmet was never really intended to prevent a concussion. It was meant to protect against skull fractures!⁣

Our helmets do a great job protecting our bones from breaking, but they can’t really stop the transmission of forces that travel into the brain and shear some of those delicate axons.⁣

Some have even made the case that because helmets protect our skulls so well, that new helmets have been increasingly weaponized in tackling forms that may increase concussive injury. For better or worse, rules against targeting have started to reduce this problem.⁣

So what can protect us from concussion in sports?⁣



So far the best evidence is to avoid head and neck contact, especially in earlier age groups.⁣

There are studies going on looking at therapeutic tools like vision training, neck muscle training, specialized mouth guards, and specialized neck collars.⁣

The truth is that the evidence for these things are still early and flawed, so we can’t say anything with confidence yet.⁣

In the meantime, the best things we can do is to make ourselves maximally prepared in strength, awareness, and reaction time so we can avoid the hits that may cause our brains harm.⁣

Gait Testing Can Predict Future Post Concussion Syndrome

A recent study in the journal Gait and Posture looked at various biomarkers in posture and walking in athletes who suffered a #concussion.⁣

⁣Prognosis for Persistent Post Concussion Symptoms using a Multifaceted Objective Gait and Balance Assessment Approach


They wanted to see if any specific findings on balance or gait testing could predict which patients would have a worse recovery.⁣

The study found that out of all of the balance and walking parameters, 2 metrics were associated with the development of persistent symptoms or #postconcussionsyndrome


𝗗𝘂𝗮𝗹 𝗧𝗮𝘀𝗸 𝗮𝗻𝗱 𝗚𝗮𝗶𝘁⁣
The study found that when concussion patients had to perform a cognitive task while walking, there were changes in their walk that predicted future symptoms.⁣

Patients that were more likely to have future symptoms showed 𝙞𝙣𝙘𝙧𝙚𝙖𝙨𝙚𝙙 𝙢𝙤𝙫𝙚𝙢𝙚𝙣𝙩 𝙤𝙛 𝙩𝙝𝙚𝙞𝙧 𝙡𝙤𝙬𝙚𝙧 𝙗𝙖𝙘𝙠 when walking, and also 𝘀𝗵𝗼𝘄𝗲𝗱 𝗺𝗼𝗿𝗲 𝗿𝗮𝗻𝗱𝗼𝗺 𝗳𝗼𝗼𝘁 𝗽𝗹𝗮𝗰𝗲𝗺𝗲𝗻𝘁 when landing when they were engaged in a cognitive task.⁣

This might not seem like a big deal, but this may be a subtle sign that the brain is struggling to compartmentalize basic movement patterns, so it is using important resources from the frontal lobe to do something as simple as walking straight.⁣

This is why we have all of our patients perform a walking test with and without a cognitive challenge.⁣

The dual task paradigm gives us insight into brain function, and it also lets us know if we can use dual task exercises like the Fitlight to enhance our rehab.⁣

#neuroscience#neuroplasticity#tbi

The Nocebo Effect: When Our Words and Beliefs Make Us Sick

Most everyone knows about or has heard of the placebo effect; the seemingly magical ability for our bodies to feel better or overcome illness from a belief in a treatment that has no effect.

It’s one of the things in medicine that we are always wary of, especially when selecting treatments associated with alternative medicine. After all, no one wants to waste time, energy, or money on something that isn’t supposed to work. It feels like you’re getting scammed, even if the end result is positive.

However, there is a lesser known effect that I believe is more harmful phenomenon that isn’t being discussed enough. It’s more pervasive in the entirety of healthcare, and it’s societal ramifications can have massive implications on outcomes related to your own health.

We’re talking about the Nocebo Effect

Nocebo, No Bueno

Where positive beliefs about a treatment lead to positive health outcomes in placebo, nocebos occur when negative beliefs about a treatment or condition lead to negative health outcomes.

We don’t really think about nocebos because in the context of healthcare, we are not really encountering clinicians or practitioners who are intentionally trying to to make us feel worse. It’s just a poor business model.

Nocebos affect us in much more subtle ways. They happen when patients have false or exaggerated beliefs about a treatment, condition, or situation, and these beliefs can often come from well-intentioned providers or social media influencers.

Here are some of the examples of known nocebic responses in society:

  • People who think they are sensitive to MSG and feel sick after eating Chinese food with suspected MSG, but feel perfectly fine eating MSG-rich snack foods. David Chang tackles this in his series Ugly Delicious on Netflix. You can watch the clip here (Warning: uses the F-word a few times). I’m not saying that people can’t be sensitive to MSG (probably really uncommon), but if you are sensitive to MSG in Chinese food, but not Doritos, then you’re not sensitive to MSG, you’re likely expressing a nocebo.
  • Patients who take a placebo pill in a drug trial and hear a list of potential side effects are much more likely to experience those side effects compared to patients without hearing the side effects. [Source]
  • In 1998, a teacher in a Tennessee school reported a “gas-like” smell inside of a school. The school was evacuated, and the ensuing panic from a suspected gas-leak led to over 100 students/staff going to the emergency room with 38 of them being hospitalized over-night. It turns out that it was a false-alarm and no leaks or chemicals were detected so the illness was attributed to a mass psychogenic illness. [Source]

But remember this because it’s super important:

People experiencing nocebos are NOT faking their illness. Their symptoms and experiences are very real, but the cause of their pain or illness is not what they think it is.


Our minds exert extraordinary influence on our bodies, but our minds are easily fooled for the better with a placebo, or for the worse with a nocebo.

Are Doctors Creating Nocebos?

One example we see often in chiropractic are beliefs about X-ray or MRI findings. Many patients after getting X-rays and MRI show signs of disc degeneration or disc herniation. Disc herniations in particular are known to cause radiating arm and leg pain, especially in the acute phase of injury.

Doctors frequently talk about disc herniations and tell people that they can’t play sports anymore or lift heavy things because they have disc herniations.

But the evidence is overwhelming in showing disc herniations don’t necessarily cause chronic back pain. In fact, most disc herniations are completely asymptomatic!

By the time we are 50, we will all have disc degeneration, and most of us will have bulging discs and we will walk, run, and exercise fine without any pain!

A large study using MRI on patients without pain showed that common MRI findings associated with pain are present in PAIN-FREE people as we age.

But if we have taken the patient with a disc herniation and convinced them that their back is weak from herniation and to avoid exercise, we are predisposing this patient to nocebo to one of the best things for the chronic back pain patient….EXERCISE.

As clinicians and healthcare providers, we have to be extremely judicious with our words when interacting with patients. We are responsible for knowing when something has life altering consequences and making the appropriate recommendation for care. On the flip side, we have to be informed and know when a diagnosis is probably self-limiting and allow the patient to feel empowered that they’re going to get better; with or without our help.

Combating Nocebos

None of us are immune to the effects placebo or nocebo because of the powerful influence that beliefs have on human physiology. Our brains love to create patterns out of noise in order to make sense of the world, and the easiest way to make sense of the world is when our perception matches our beliefs.

It is important that we have strategies that reduce the impact of nocebo because nocebos can decrease your ability to recover from chronic pain and illness.

I’ve seen so many patients come into the office that have become so scared of normal human behavior that they may as well wrap themselves in bubble wrap.

This isn’t a way for a human being to live.

So how do we counter the effects of nocebo? Here are some major factors I’ve seen in practice:

  • Never Make Your Diagnosis Your Identity: You would never willingly allow someone to steal your credit card and social security card, but you should be even more protective about what you allow to identify as yourself. When people make their diagnosis their identity, they become resigned to accept all of the possible negative consequences of their diagnosis as an inevitable part of their life.
  • Embrace the Idea That Your Body Is Resilient: One of the first things we teach patients in our office is that their body is capable of healing itself. Having a belief system that your body is capable of facing challenge and enduring allows people to have a condition or illness and not allow the condition to hold them back.
  • Don’t Trust Health Providers That Scare You Into Treatment: It’s one of my biggest pet peeves in the world when I hear other providers using a patient’s condition to scare and coerce people into procedures. I having patients coming in each week that have doctors telling them that a small herniation is a risk for paralysis if they get into another accident and that the only solution is surgery. I’ve also had patients whose chiropractor told them that they had the worst spine they’ve ever seen because they had some signs of age related disc degeneration on their X-ray. This. Is. MADNESS

As healthcare providers, we have to ensure that our words don’t compromise the ability for a patient to get better. When we use fear and scare tactics to coerce people into taking treatment plans, we not only abusing patient trust for financial gain, you are also compromising the outcomes of patients who simply want to get better.

We have to do better and help all of our patients combat this insidious plague on our patients by empowering people to have faith and confidence in their ability to heal.

Cervical Degeneration and Cervical Vertigo

Cervical vertigo is a controversial entity in the world of balance and vestibular disorders. It has generally been a diagnosis of exclusion when a patient is feeling dizzy but has no diagnosable pathology in the inner ear or brain.

The reality is that problems in the cervical spine are commonly linked to feelings of imbalance and disequilibrium. Cervical spine problems are rarely tied to the spinning rotational vertigo of someone having inner ear pathology. Most people with cervical “vertigo” really have which can include feelings of being really off balance, shaky, or a tilt like feeling of motion.

A 2018 study looked at how a degenerative problem in the neck can be associated with a diagnosis of cervical vertigo:

Mechanoreceptors in Diseased Cervical Intervertebral Disc and Vertigo

The study looked at patients with neck and arm pain related to cervical disc problems presenting for surgery. The patients were divided into patients with and without a complaint of vertigo. The patients with vertigo were examined to rule out other causes of vertigo like vestibular neuritis, benign positional vertigo, or stroke.

The research team examined the discs from patients with vertigo, without vertigo, and a control group of cadavers with no disc degeneration. The findings were really interesting.

In patients with vertigo, there are large increases in mechanical receptors in the degenerated discs compared to the patients without vertigo, and to the control group. These Ruffini Corpuscles help detect movement and position from your joints and muscles to help tell your brain what your joint is doing in space. Free nerve fibers are responsible for transmission of stimuli usually associated with pain. You can see the distribution below:

Patients with vertigo had significantly more Ruffini Corpuscles in their degenerated discs than the non-vertigo and control group. What does this mean for dizzy patients?
Patients with vertigo had significantly more Ruffini Corpuscles in their degenerated discs than the non-vertigo and control group. What does this mean for dizzy patients?
The data from the above chart in bar graph form showing increased receptors in the vertigo patients.

As expected, the patients with neck pain only, and neck pain with vertigo have a similar increases of free nerve fibers compared to controls. That’s probably why their neck is hurting.

However, a big reason why this study is interesting is because many people in the world of rehab and manual medicine would usually associate dizziness with a decrease in mechanical receptors in their spine, not an increase.

So what gives?

We don’t know exactly what this means, but it’s possible that increased density of these receptors may be transmitting excessive or erroneous information to the brain about the joint position.

The same group did a follow up study after they had performed disc surgeries on these patients. You can see the link to the study below:

Cervical Intervertebral Disc Degeneration Contributes to Dizziness: A Clinical and Immunohistochemical Study

During the study, they performed surgery on 50+ patients and 25 patients refused the surgery and received basic physical therapy and cervical collar recommendations. You can see the results below:

Comparison of patients with cervical dizziness and neck pain getting surgery vs routine physical therapy and neck bracing.

You can see that the patients who had the neck surgery showed clear and long lasting improvements in both neck pain and dizziness compared to the conservative group which implied that the degenerated disc was the probable source of bad sensory information to the brain.

So Is Surgery the Right Answer for Cervical Dizziness?

Maybe for some cases. If you have radiating arm pain with weakness tied to a badly herniated disc, then surgery might be able to help resolve both complaints, but there’s still a lot of research that needs to be done. Surgery is a BIG deal, and generally reserve that for really bad herniation cases with clear signs of neurological deficit like weakness, loss of reflexes, and atrophy of muscle.

The good news is there are a lot of ways to address cervical dizziness beyond routine physical therapy, and they have really great outcomes. One method is by improving the curve in the neck. A randomized trial of curve based rehab compared to routine physical therapy showed significant improvements in neck pain and dizziness at 1 year.

You can read some more about cervical curves and dizziness at this link:

Working on your curves: Long term outcomes from fixing military necks

A randomized clinical trial of cervical curve rehab on cervical dizziness

There’s also numerous cases of cervical dizziness that have no signs of degeneration in their spine. This is especially prevalent in patients with dizziness after whiplash and head injury in young athletes. These patients seem to do well when we focus on the upper neck where the injury is likely to affect the ligaments of the craniocervical junction.

Comparison of mulligan sustained natural apophyseal glides and maitland mobilizations for treatment of cervicogenic dizziness: a randomized controlled trial.

Long story short, degeneration of the cervical spine doesn’t have to be a sentencing for dizziness. It’s a risk factor, but it can be modified with the application of effective conservative interventions for the neck.

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