Tag: Intracranial Hypertension

  • The Michelle Cole Story – A Chiari Warrior’s Journey [UPDATED]

    The Michelle Cole Story – A Chiari Warrior’s Journey [UPDATED]

    As I sit down to update my journey, I am crushed that we’re still figuring things out (and nothing really was as I was initially told it would be), yet at the same time, I’m so thankful that we’re continuing to figure things out. Nobody should have to fight a fight like this (every symptom, every diagnosis), but all of this just increases my resolve to change it before anyone else in my family (or yours) is having to fight it! What we fail to change in our generation, our children and their children will face in theirs!


    Looking back, I have always had symptoms of Ehlers-Danlos Syndrome (EDS). As a child, I was in the school nurse’s office for stomach problems at least once a week. I was “double-jointed” and my friends always asked me to do maneuvers that I thought everyone should really be able to do if they tried. I was athletic early on, a tom-boy. I particularly loved playing softball (or baseball with tennis balls was the absolute best), but my ankles rolled when I started to run. Despite the fact that I was the only player that twisted their ankle multiple times in every game, I didn’t think there was really anything abnormal about me. Later, as an adult, I had repeated miscarriages and complications in all of my pregnancies, but the doctors conveniently came up with different explanations for each “rare occurrence.” It couldn’t possibly be all those rare mishaps, but EDS explained it all.

    My mother passed away from a brain aneurysm the day after my 18th birthday. She was just 37 years old when she died. As a child she had a lazy eye and scoliosis of the spine, so an eye patch and back brace were a normal part of her childhood attire. She suffered from migraines throughout her adulthood, but nothing was more tale-telling than reading her journal after she passed, with multiple entries about repeated headaches and neck pain. Decades after her death, my maternal grandmother (my mother’s mother) developed multiple brain aneurysms over the course of a decade. Each time one appeared, she had it filled with titanium coils. I always admired her fight for life.

    Me and my mom (1971).

    The first headaches that I remember started immediately after giving birth to my first son in 1992. It was a cesarean section at an Army hospital in Fort Ord, California. Instead of an epidural, they gave me three spinal injections to numb me from the chest down. At my postpartum check-up, I complained of daily headaches when upright. My primary care doctor ordered a CT scan, but because it was just a few years after my mom had died they looked only for brain aneurysms and found none. I was still having those orthostatic headaches six months later.

    Me and my eldest son, Johnathan (1992).

    The Accident that Shook Everything

    In 2000, I was a Bible College student and stay-at-home mom of three happy and active children (ages 8, 5, and 2). One September night, I was in a car accident that changed all of our lives. My neck was never the same again. My initial symptoms were head/neck pain, but all radiology reports indicated that everything was “unremarkable.” I tried everything they offered to me: rest, acupuncture, acupressure, steroid injections, osteopathic and chiropractic care, nerve stimulation units, physical therapy, pain meds, etc. Nothing worked long-term. Then in 2005, my neurological problems started intensifying. I began having bouts of partial paralysis in my legs and hands. I would just wake up one morning and out of the blue, I would have no fine motor skills. I would wake up feeling as though I had no thigh muscles to support me when I walked or tried to step up a step, and I had difficulty coordinating my footsteps. My primary care doctor at the time did blood tests and concluded that my “potassium level was on the low side of normal, so it must have been from potassium shock,” and he thought that no other tests were warranted. I started having vertigo whenever I was at any elevated height, even just a step or two up, like my brain couldn’t figure out how to balance with visual changes in height (I’d take a step up or down like the step was much higher or lower than it actually was). I also started having noticeable memory issues and intermittent trouble processing information. They tested to see if I was having small seizures in my sleep. When that was ruled out, they referred me to the memory clinic for further cognitive testing. They had no cognitive baseline to compare my results to, but said that I “tested higher than 89% of the population, so I should be happy,” and that I should just try reducing stress in case it was stress-related. They didn’t understand that it didn’t matter to me “how I compared to others.” I was only 34 years old and something was very wrong with me; I wanted answers that had nothing to do with the general population. In 2006, my eyes started twitching all day, every day, until the muscles just wore out and I could no longer hold them open completely. Oddly, one of my college professors inquired about my eyes and recommended that I have it investigated because it “could be neurological in origin.” When I did talk to my doctor about it, he saw the recommendations of the Memory Clinic and attributed it to stress as well, without any testing.


    My Chiari Diagnosis

    Finally, in 2010, ten years after the car accident, another MRI was done at my insistence to check for aneurysms once again (because I still was having excruciating head/neck pain and trouble holding my head up). I received an email from my primary care doctor that they found a cause of all of my symptoms. It was a condition called Chiari Malformation and the neurosurgery department would be contacting me to make an appointment. The neurosurgeon (who became my neurosurgeon) checked through my MRIs and said that the Chiari Malformation was evident on my first MRI after the accident ten years earlier. I was told that it was congenital and that it is commonly believed to be a result of prenatal drug use or lack of proper prenatal care (which was devastating to hear, but not all that unlikely as I was born in 1971. It also ended up being very wrong “textbook information” that they tell us all). Desperate for a measure of relief, I underwent a full decompression surgery a few weeks later. Missing the fact that part of my brain was in my spinal canal was 100% the hospital’s fault, but in hindsight, I really wish that I had done more research before surgery. I had comorbid conditions (many of which my doctors hadn’t even heard of, didn’t fully understand, and more importantly, they didn’t know the connection between these comorbids and my herniated tonsils). Initially, I felt quite a bit better. The release of pressure in my head helped my headaches. It was short lived though. Those undiagnosed comorbids caused my decompression to ultimately fail, although it all unfolded over several years.

    My preoperative MRI (2010).

    Post-op Complication: Pseudomeningocele

    When I was released from the hospital following decompression surgery, I was instructed not to lift, push, or pull anything for two weeks so that my dura patch would have a chance to adhere. The problem was, I could feel fluid squeezing out of the patch far beyond that two-week limit. I developed a pseudomeningocele (blue box above), which can be normal immediately after surgery before the dura adheres, but as long as there is no active leak, the body should absorb the fluid and the pseudomeningocele should quickly resolve. My neurosurgeon tapped some of the fluid out with a syringe twice and we waited patiently to see if it would subside on its own. It did not subside and in December 2012 (just over two years post-decompression), I developed acute vertigo. Everything was spinning and rocking, non-stop. It didn’t matter if my eyes were open or closed. I was waking up vomiting in my sleep from the dizziness. I couldn’t walk at all without falling hard to my right. I had no sense of balance at all and it didn’t just come and go, it was constant. Another MRI was done and it showed that my cerebellum was absorbing the fluid from the pseudomeningocele (so the cerebrospinal fluid was inside my brain, not just surrounding it; see light blue circle in image above). The decision was made to put in a subgaleo-peritoneal shunt (SP shunt), which runs from the pseudomeningocele to my peritoneum. They expected that it might take up to six months to fully drain from my cerebellum, but I woke up from the anesthesia with no signs of vertigo. I believe this surgery saved my life, but as with all shunts (especially amongst those with EDS, which I had not yet been diagnosed with), the shunt was destined to cause problems all by itself.

    Postoperative MRI (2012)

    My Many Shunt Revisions

    In April 2013, an unrelated CT Scan revealed that my shunt was no longer in my peritoneum. My NS scheduled for a general surgeon to “tie in” my shunt so it would not happen again (surgery #3). We went several months without complication until that November. The tied in shunt pulled out of my peritoneum again (it was excruciating). Hoping gravity would help in the matter, my NS did an incision just under my right rib cage and dropped it down into my peritoneum (surgery #4). Shortly thereafter, radiologist reports started showing a concern for the location of my brain and I was diagnosed with “Sagging Brain Syndrome.” So my six-week post-op appointment (which my NS did faithfully after every surgery) became my pre-op appointment for my 5th related surgery. This time a non-adjustable valve was attached to the shunt (at my chest) in hopes that by slowing down the amount of CSF being drained by the shunt, my head could retain more fluid and my brain could once again lift and become buoyant. Five months later I developed a hernia and upon closer examination (during surgery), it was found that my peritoneum was literally falling apart from all the trauma of the shunts; so my hernia removal surgery became a reconstruction surgery where my abdominal wall was pulled together with mesh, while carefully ensuring that the shunt didn’t come out (surgery #6). The shunt never moved again. As my brain continued to sag, the choice was made to replace the valve with an adjustable valve and in November of that same year, I was having surgery #7. The valve was adjusted to its slowest possible setting in hopes of finding a balance where it drained enough to keep the hydrocephalus at bay, yet retain enough CSF to lift my brain and keep it lifted and out of my spinal canal (so we could establish flow to the spinal canal and avoid the possibility of a syrinx).


    Diagnosis: Ehlers-Danlos Syndrome

    Despite my concerns that I might have a connective tissue issue and being told over-and-over again that I “didn’t look like someone with Ehlers-Danlos Syndrome,” I was finally diagnosed with it in May 2015. After finally finding a neurologist who understood the role that our connective tissues can have in a Chiari Malformation, I was given a referral to a geneticist. It still wasn’t as easy as it should be though. The geneticist did not know much about Chiari or Ehlers-Danlos related conditions (although he didn’t initially admit to that), so I had no idea at that point what was and was not related, and neither did my doctors. I received a call from the geneticist’s assistant and I agreed to send her pictures of my hypermobile maneuvers from the Beighton Scale. I could do all but bend over and put my hands flat on the floor with my knees straight, but I was able to do that when I was younger (and thinner). I was given a 9/9 on the Beighton Scale and was told that he would just mark my chart as diagnosed “hypermobile” and that he didn’t need to see me. I honestly didn’t know any better at this point, but I was about to learn something very important. I sat there thinking about what this “hypermobile” diagnosis would mean for me and decided to look more into EDS for myself. I read about the high risk of aneurysms, organ tearing, miscarriages, etc. and I was back on the phone with that assistant within twenty minutes. She asked if she could call me back, and within the hour the geneticist had decided that he needed to see me. He set up an appointment with me within twenty-four hours and asked if it was okay if he had a few others (doctors and medical students) there as well, since they’re a training hospital and they “don’t really come across patients with Ehlers-Danlos” (he should have told me that from the beginning). I agreed. Despite his lack of knowledge on EDS related comorbidities, he did know exactly where on my body to look for characteristics of EDS (all of which I thought I didn’t have). For instance, my skin isn’t unusually elastic, except in my upper arms and upper thighs. My skin isn’t translucent (I’m olive complected), except for on my breasts, back, and inner forearms. My skin isn’t unusually soft, except on my back. Now concerned that I might have Vascular Type EDS (vEDS), he decided to have me tested for that. The test was easy on my part but expensive on theirs. They drew blood and had it refrigerated and shipped to a lab in Washington state. It took thirty days for them to make sure that there was no mutation in my COL3A1 (collagen 3; alpha 1) gene, which has a median mortality age of 48. Initially, I felt devastated, since I was already 44. I decided that I hadn’t fought through all that I had, to only live a few more years. Thirty days later, the test came back indicating that I didn’t have vEDS and by default, I was diagnosed with Hypermobility Type EDS (hEDS). I was relieved, but the geneticist assured me that I still needed to be cautious. Since EDS symptoms are known to cross the type boundaries, and we already knew that vascular complications ran in the family (with the aneurysms) and with me personally (my peritoneum tearing), it technically made me “hEDS with vEDS crossover symptoms” and I’d probably have to explain that to my doctors for the rest of my life, so they remain aware of my potential to have additional vascular problems.


    My Poor Mess of a Neck

    The electric shock feeling in my spine (Lhermitte’s Sign) that I’d had intermittently for years, became an all-day, everyday thing, and much stronger in intensity. The MRI revealed that the herniated disc I had between my C3/4 was getting worse. The disc was removed with cadaver put in its place and the discs were fused together. My 8th surgery (ACDF = Anterior Cervical Discectomy and Fusion) wasn’t related to Chiari, but it was related to the EDS. We knew that my cervical spine was really bad from the beginning, but it got worse. I am now actually diagnosed with Degenerative Disc Disease in all three levels of my spine, but my neck has by far taken the brunt of it all. The ACDF, while 100% necessary, compromised the discs adjacent to it, and every disc from C4-7 is either bulging or herniated (Subaxial (cervical) Instability), so additional surgeries are likely to be needed.


    Learning to Advocate for Myself

    Over the past several years I have become an enthusiast of Chiari related research and MRIs (out of medical necessity more than anything). It became apparent to me that I absolutely needed to know everything that was going on in my body in case my doctors didn’t. When I first started, I’d print out studies and lay in bed with multiple high-lighters. I had such brain fog that I’d lay there crying at the fact that I was reading and rereading the same paragraphs over again, but I knew that I had to learn it despite how impossible it seemed. I prayed a lot for God to help me with my understanding and He did. I also started looking at the medications I was taking, the supplements I was taking, and what the ideal doses were for me (especially those that would help with inflammation and cognition), and other natural remedies. The first thing that I removed was all of the nerve meds that they had me on for peripheral neuropathy. I was maxed out on Nortriptyline (a tricyclic antidepressant) and almost maxed on Gabapentin (both of which had caused me to gain an incredible amount of weight over the years). When I informed my primary care doctor that I wanted to go off of them all, he thought it was a bad idea because of the severity of my neuropathy. I insisted though and asked him to help me to wean myself off of both of them in healthy intervals, and let’s “just see.” With the first down-dose, I physically felt a reduction in inflammation. It took me many months to wean off and get them out of my system, but in hindsight, I think this was the single best decision that I could have made. The longer I was on supplements instead of the nerve meds, the more my brain-fog improved, and I now believe that I have regained all that I’ve lost cognitively and then some.


    Syringobulbia

    In 2016, I was reviewing some of my old MRIs and I saw a large CSF filled hole in my lower medulla oblongata (lower brainstem). It was obvious in all MRI series since 2015, yet I was told that all was stable. After researching it, I asked my neurologist to take a look and see if it could be Syringobulbia. She referred my question to my neurosurgeon and he confirmed that I had an 11mm cyst in my brain stem. This type of cyst happens when there is a blockage of cerebrospinal fluid and is most frequent when the brain stem is also herniated below the foramen magnum (Chiari 1.5). It explained a lot of the problems that I was having, that we had thought to be unrelated. For instance, and I had a decreased sensitivity to temperature for years, never feeling hot or cold; and never having the automatic reactions that I should have had in response to temperature, like sweating and shivering. I could comfortably be outside in heat above 100° without breaking a sweat, or be outside in shorts and a tank-top when it was a chilly 30° morning without ever shivering. I also developed tachycardia and I am now medicated to keep my heart rate down to a safe level. My neurosurgeon ordered a new MRI in April 2017. The size of the syrinx had decreased to 9mm but was draining down my spinal cord forming an additional syrinx (Syringomyelia).

    Syringobulbia. Left – Syrinx in 2015 measuring 11mm in diameter. Right – Syrinx in 2017 measuring 9mm in diameter.

    Consulting a Specialist

    After all that I had been through in my fight, in April 2017, I decided to pay out of the pocket and have an online consultation with a Chiari Specialist in New York, who specializes in Chiari with EDS (the best $300 that I’ve spent in my fight). I sent him my pertinent medical records and copies of my MRIs in advance, wanting to find out what my doctor did right, and what he did wrong; and what course of action should be taken at that point. My expectation was that he would give me reasons why I should go to New York to see him, but that’s not at all what he told me. He told me what my doctor did right and that he didn’t disagree with the course of action that my neurosurgeon wanted to take. He said that my brain had sagged as low as it really could, but that since my high/low pressures had balanced out, and I was feeling better than I had in years, my syringes really should dictate our next course of action.

    In March 2018, following an exceptional year (at least where my head and neck are concerned) new imaging was done. My neurosurgeon asked me to come in to review it. It gave me a chance to tell him about the specialist’s opinions. My MRI showed that the Syringobulbia had decreased another 2mm. I asked him what that meant for the cervical syrinx, and that had almost completely disappeared. I asked him to go back to my images and correct me if I was wrong, but “the only reason that a syrinx (in either location) would dissipate like that was if I was finally getting CSF flow down my canal (despite my severe brain sag).” He agreed and I think he was a little surprised to see me think on my feet and figure that out in front of him (where I wasn’t having to ask anyone or look it up). He also confirmed that I had an Acquired Chiari, secondary to Intracranial Hypertension. He applauded me for learning all that I had and said that he wished that he had checked my pressures before decompressing me, as it may have changed the course of action that we had taken. And we agreed to wait a year and see where the syringes (syrinxes) are. As I left his office that day, I felt such a sense of relief, that we were finally getting CSF flow like the decompression in 2010 was meant to do.


    My Extensive Epidural CSF Collection

    In 2022, my neurosurgeon contacted me telling me that he was retiring and he’d like to have one last MRI of my entire spine (he added the brain to the request at my request). Unbeknownst to me, he ordered a CSF Leak Protocol, which consists of less slices, but they’re specifically looking for leaks. The images showed an “extensive extradural CSF collection from C7-L4, consistent with a CSF Leak and probable dural tear or CSF Venous Fistula.” They followed up with a Dynamic CT Myelogram. A Dynamic is different than a regular CT Myelogram, as they do it over 2-3 days, and they insert the contrast little by little into my spinal canal, and watch carefully for it to leave the spinal canal. CSF leaks and dural tears aren’t uncommon amongst Ehlers-Danlos patients, and usually happen in the front or back of the canal. CSF Venous Fistulas on the other hand are a much newer phenomenon, and they usually happen on the sides of the canal (more often on the right side). After two days of grueling tests, they found no active leaks or evidence of fistulas and surmised that what they saw on the MRIs to be “residual artifacts” from a leak that I had in the past… a leak that could have pulled my brain down into my spinal canal in the first place.

    Sagittal and axial views of my thoracic and lumbar images showing the residual artifacts of an extensive extradural CSF collection.

    It’s been a long road, hard road. I still battle inflammation and I’m definitely not done with surgeries. Eventually, I will need a ventriculoatrial (VA) shunt to hopefully resolve my high-pressure issues and enable us to remove my over-draining SP shunt that is making my brain sag. But for right now, I’m just enjoying feeling so much better! I praise God every step of the way, as I know that He’s there making a way out of no way. I have no idea why He took so long or why others haven’t seen the same results (because He loves them as much as He loves me), but I don’t have to have all the answers. I’ll just praise Him through the course of my journey, as He’s never let me go through it alone!

    *I dedicate this story to my family: John (husband), Ron (dad), Johnathan (son), MyKaella (daughter), Jojo (son) and my daughters-in-law, Violet and Sarah. Thank you all for all your help and for standing and kneeling beside me throughout my entire ordeal. You’ve been there for me and loved me through this long haul and I praise God for each and every one of you. 


    Originally written in 2018. Updated April 2022.

  • Brain Under Pressure – Understanding Intracranial Hypertension [Archived]

    Brain Under Pressure – Understanding Intracranial Hypertension [Archived]

    INTRACRANIAL HYPERTENSION (IH) AND IDIOPATHIC INTRACRANIAL HYPERTENSION (IIH) ARE CONNECTED, BUT ARE NOT THE SAME THING AND THEREFORE SHOULD NOT BE USED INTERCHANGEABLY.

    Intracranial Hypertension (IH) means high pressure inside the skull. Intracranial Pressure (ICP) is measured in millimeters of mercury (mmHg). Most scholars agree that on average, “normal pressure” should be between 5-15 mmHg and that 20-25 mmHg is when the ICP crosses the line into being IH. Pressure can be brought on by several different means: space-occupying masses such as hydrocephalus and cranial cysts/tumors; cranial edema (Encephalitis); trauma; stroke; aneurysm; certain infections/diseases (Meningitis), liver failure[1], kidney failure[2]; or as a side-effect of certain medications (such as: Tetracycline[3][5], Sulfasalazine[4], Lithium[5], excess amounts of Vitamin A, steroid use[6], growth hormone treatments[6], and the hormonal Intrauterine Device (IUD), “Mirena”[7]); however, sometimes the cause of the pressure is completely unknown. When an etiological cofactor exists, it is considered Secondary Intracranial Hypertension (SIH); when no other cause is identified, it is known as Idiopathic Intracranial Hypertension (IIH) or Primary Intracranial Hypertension (PIH).

    “Idiopathic Intracranial Hypertension (IIH) was first noticed in 1893, by the German physician Heinrich Quincke, who named it Serous Meningitis. As its absence of space occupying masses/lesions began to draw more thought, it was renamed Pseudotumor Cerebri (PTC) by Max Nonne in 1904. Sometime later, the term “Benign Intracranial Hypertension” began being used interchangeably with Pseudotumor Cerebri, to describe the fact that while it is sharing some of the same characteristics that a cranial tumor would cause, it is benign (not harmful), but arguments were made against it in that blindness is not indicative of being benign.”[6] The name finally settled as “Idiopathic Intracranial Hypertension,” which means IH of an unknown cause. No matter what you choose to call it, the pain and damage remains the same for those who have it.

     

    UNDERSTANDING IDIOPATHIC INTRACRANIAL HYPERTENSION
    IIH is a neurological disorder where the cerebrospinal fluid within the skull is elevated, without the presence of a space-occupying mass, edema (brought on by things such as trauma, infection, or disease), or any adverse reactions to certain medications. Studies show that IIH is more common amongst women between the ages of 20 and 50,[8] and there is a slight increase amongst those that are overweight. Some studies also suggest a connection between obstructive sleep apnea and transverse cerebral venous sinus stenosis.[9] Amongst the general population, IIH is believed to exist in 1/100,000 (0.00001). Amongst those that are 10% above their ideal body weight, the numbers increase to 13/100,000 (0.00013), and rising to 19/100,000 (0.00019) in those 20% above their ideal body weight.[10] Although doctors often tend to pass this off as merely a side effect of weight gain, the increase is slim and seems to decrease as the percentage of weight gain above ideal weight continues to rise above the 10% margin. Additionally, the weight factor excludes men and children under the age of 10, which may simply be because women are more likely than men to have comorbid conditions that would lead to Intracranial Hypertension. Studies show that the women to men ratio for Chiari Malformation is believed to be 3:1 and those with both Chiari Malformation and Ehlers-Danlos Syndromes 9:1[11]). However weight is not irrelevant with IIH, the overweight/obese patient population report finding improvement of some symptoms when weight loss of 5-10% of one’s overall body weight, when accompanied by a low-salt diet[12]. 

     

    UNDERSTANDING THE IH/IIH CONNECTION: THE MONRO-KELLIE DOCTRINE
    The association between IH/IIH and Chiari Malformation, appears to be a malicious intricate pathological circle. The cranium (skull) consists of brain matter, cerebrospinal fluid, and both venous and arterial blood. A hypothesis, referred to as the Monro-Kellie Hypothesis (or Monro-Kellie Doctrine), states, “The sum of volumes of brain, CSF, and intracranial blood is constant. An increase in one should cause a decrease in one or both of the remaining two.”[13] Therefore, if there is an abundance of cerebrospinal fluid (IIH or hydrocephalus), both cranial blood volume and brain matter should be forced to deplete. This depletion is usually directed in the path of least resistance – through the foramen magnum and into the spinal canal. When the cranial brain matter closest to the bottom of the skull (cerebellar tonsils) goes through the foramen magnum and into the spinal canal (an Acquired Chiari Malformation), it blocks the flow of cerebrospinal fluid, which in turn, continues to raise intracranial pressure.

     

    SYMPTOMS OF INTRACRANIAL HYPERTENSION
    Intracranial Hypertension (IH) can be either acute or chronic and comes with a variety of symptoms, many of which can help distinguish IH pain from typical pain associated with Chiari Malformation. A typical Chiari headache originates at the back of the skull (at the occiput), but IH headaches are usually described as pressure at the top of the head, that radiates downward. Headaches tend to be worse when laying down (which is opposite of low pressure headaches that are often relieved by laying down). Those that suffer from IH, often report waking up from sleep with a bad headache, and often a slight incline can help alleviate the headache pain. Pulsatile Tinnitus occurs when you hear a ringing in your ears that coincides with your heart beat. The tale-tell symptom of IH involves the damage done to the optical nerves.  Papilledema is when the optic discs swell in response to the increased cranial pressure.[14] Symptoms of Papilledema include: headaches behind the eyes, blurred vision, fleeting vision, dimmed vision, double vision, visual obscurations, decreased peripheral vision, and photopsia. Another source of IH damage is seen in the pituitary gland and is known as Empty Sella Syndrome (ESS). As the high intracranial pressure (ICP) tries to take over, cerebrospinal fluid finds its way to the sella turcica and starts filling it with spinal fluid (partially or completely)[15]. The intruding CSF attempts to envelope this depression in the sphenoid bone, and squeezes the pituitary gland, flattening it until it appears “empty.” While some initially suffer no symptoms of the damage done to the pituitary gland, most eventually develop a variety of hormonal issues, known as hypopituitarism.

     

    DIAGNOSIS CRITERIA
    Diagnosis of Intracranial Hypertension usually begins with investigating either the headaches or the vision problems. The least invasive test is having a neuro-ophthalmologist check behind your eyes for Papilledema. It is not considered conclusive in testing for IH, but it is essential in determining the extent of the damage to the optical nerves. Magnetic Resonance Imaging (MRI) of the brain can be useful in showing signs of Intracranial Hypertension. In cases where one or more space-occupying masses exists, further imaging and often biopsy may be required. The type of mass, its exact location, and the amount of damage that it is believed to be doing, will be used to determine the best treatment. If imaging gives an indication that the intracranial pressure is high, but no space-occupying mass exists, additional testing is usually necessary to confirm, some of which can be potentially be dangerous for those with Heritable Disorders of Connective Tissue (HDCT), such as Ehlers-Danlos Syndromes (EDS). Lumbar punctures (LP), also known as a spinal tap, are often used to test the opening CSF pressure, but by puncturing the dura (which is thinner than normal with Connective Tissue Disorders), the risk of a CSF leak is high. When an LP causes a CSF leak, the first indication is usually a post-dural-puncture headache (PLPH) and eventually, the intracranial hypertension will decrease, as the leak causes intracranial hypotension.[16] CSF leaks can escalate very quickly and can be difficult to identify and treat; therefore, we recommend that LPs be done only when absolutely necessary, and that they be done only under fluoroscopy, by qualified surgeons that fully understand the likelihood of Connective Tissue Disorders, the symptoms of leaks, and have a plan of action should those symptoms occur. Sometimes, ICP can fluctuate and have high spikes that cause problems, rendering LPs useless unless they are done at the precise time. When these spikes are suspected ICP monitoring bolts might be the better option, but still poses a risk of leaks.[17] 

     

    TRANSVERSE SINUS STENOSIS (TSS)

    Transverse sinus stenosis (TSS) occurs when there is a narrowing of the transverse sinus (dural venous sinus), which in turn can compromise cerebral venous outflow. TSS is common in idiopathic intracranial hypertension (IIH). Depending on the study that you are reading, it is proving to be present in 65-100% of those diagnosed specifically with IIH. Its direct connection seems relatively obscure, and there is no indication of its prevalence in intracranial hypertension (IH), but it is worth looking for and treating if found. While scholars remain undecided as to whether TSS is a cause or consequence of IH, if it does prove to be a cause of high pressure, IIH will likely no longer have an idiopathic element to it and it will become another etiology of Intracranial Hypertension. TSS can often be undetectable with standard Magnetic Resonance Imaging (MRI). The correct procedure would be Magnetic Resonance Venography (MRV, with the ATECO technique [18]), specifically looking for signs of stenosis, to include looking for fistula(s) and aneurysm(s). The lack of a fistula or aneurysms however, does not exclude the possibility of a TSS existing (remember it’s being found in 65-100% of those with IIH). Even with MRV, TSS can often be misinterpreted as “flow-related artifacts.” [18] Because the prevalence of TSS in IIH patients is high (some studies call it “universal”) [19], we recommend that all IIH patients have a MRV with the ATECO technique done before surgical treatment and that venous stenting be considered as a viable surgical treatment.

     

    TREATMENT OPTIONS
    Treatments for Idiopathic Intracranial Hypertension usually starts with weight loss and/or medicinal options; Diamox (Acetazolamide) and Topamax (Topiramate) are most frequently prescribed. Those with IH/IIH should avoid consuming caffeine, as it can increase pressure and therefore is counter-productive to treatment measures. Diamox is a carbonic anhydrase inhibitor and Topamax can also inhibit carbonic anhydrase, but is an anticonvulsant, often prescribed for the treatment of neuropathy and seizure disorders. Both are believed to successfully lower the production of cerebrospinal fluid. Topamax can also help suppress the appetite, which can help with weight loss, but it also comes with many side-effects like all nerve meds do. When medication fails to decrease ICP, a Ventriculoperitoneal Shunt (VP Shunt) or Ventriculoatrial Shunt (VA Shunt) are surgically placed to drain cerebrospinal fluid straight from the ventricle. Shunts are known for failing and often need a multitude of revisions. Venous stenting is not a new procedure, yet it is not readily offered. While there are studies indicating that the successful reduction of intracranial pressure can help with TSS. Stenting is not only a surgical treatment for the stenosis (which could significantly reduce the possibility of a life-threatening aneurysm in patients with a connective tissue disorder), but it is also a surgical treatment for intracranial hypertension as it “improves CSF resorption in the venous system.” [18] Therefore, it seems illogical to shunt (just dealing with the pressure) and leave such a potentially life-threatening condition untreated. [20] Studies are indicating as high as a 94% of patients being cured of all IIH symptoms as a direct result of venous stenting. [18] While all surgeries pose a risk of complications, and the statistics for stenting are likely inflated and skewed (like that of decompression surgeries), these statistics on stenting are definitely encouraging!

    Intracranial Hypertension is a complex issue that should be explored whenever a Chiari Malformation exists, before a decompression surgery is performed. When both Intracranial Hypertension and Chiari Malformation are found to co-exist, the treatment should be in consideration of the correlation of the two, as they both are pathological co-factors of one another. Failure to recognize and treat Intracranial Hypertension before or soon after decompression surgery, will increase the likelihood of a failed decompression. While a decompression surgery can lower Intracranial Hypertension, as cerebrospinal fluid is once again allowed to flow, if space-occupying masses or a case of Idiopathic Intracranial Hypertension (where too much cerebrospinal fluid is being created) are left untreated, those problems will still exist after decompression surgery and the high pressure is likely to cause the cerebellar tonsils to fall once again.

    *Revised October 2018

     

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    Holst, Anders Vedel, et al. “A Severe Case of Tetracycline-Induced Intracranial Hypertension.”Dermatology Reports, PAGEPress Publications, 31 Jan. 2011, <www.ncbi.nlm.nih.gov/pmc/articles/PMC4211491/>.

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    10 Wani, Irfan Yousuf, et al. “Complete Ophthalmoplegia: A Rare Presentation of Idiopathic Intracranial Hypertension.” Annals of Indian Academy of Neurology, Medknow Publications & Media Pvt Ltd, 2015, <www.ncbi.nlm.nih.gov/pmc/articles/PMC4683894/>.

    11 Henderson, Fraser C., et al. “Neurological and Spinal Manifestations of the Ehlers–Danlos Syndromes.” American Journal of Medical Genetics Part C: Seminars in Medical Genetics, 21 Feb. 2017, <www.onlinelibrary.wiley.com/doi/10.1002/ajmg.c.31549/full>.

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    20 Patel, et al. “Evaluating and treating venous outflow stenoses is necessary for the successful open surgical treatment of arteriovenous fistula aneurysms.” Society for Clinical Vascular Surgery, Volume 61, Issue 2. February 2015. <www.sciencedirect.com/science/article/pii/S0741521414014116>.