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Chronic migraine

Several presentations at the annual meeting of the American Headache Society held in Washington DC last weekend discussed the treatment of post-concussion symptoms in children (everything below also applies to adults). Among many topics, the speakers addressed the question of aerobic exercise after the concussion. Most experts agree that starting physical exercise too early can worsen the symptoms and delay recovery. At the same time, because aerobic exercise has so many benefits for the brain, it is prudent to begin aerobic exercise 2 to 4 weeks after the concussion. The child should begin exercising for short periods of time and at low intensity. Exercise should be stopped as soon as symptoms, such as headache or dizziness worsen. Brisk walking could be the first activity to be tried. The ideal duration is about 30 minutes and when this goal is achieved, the intensity of exercise can be gradually increased.

As far as the very common cognitive problems after a concussion, the experts also agreed that complete cognitive rest is not helpful. Just like with physical exercise, it is best to begin mild activities, such as reading for pleasure, and then slowly increase the load, as tolerated.

Several scientific presentations reported that the most common type of headaches that occurs after a concussion is migraine. When these post-concussion migraines last for more than 3 months and occur on more than 15 days each month, they are considered to be chronic migraines.

The treatment of post-concussion chronic migraines is the same as the treatment of chronic migraines that occur without a concussion. These treatments may include cognitive behavioral therapy, biofeedback, magnesium and other supplements (magnesium deficiency is found in up to 50% of migraine sufferers and magnesium is depleted by trauma), various preventive medications, and Botox injections.

Although the FDA has not yet approved Botox injections for the treatment of chronic migraines in children, Botox is safer than most drugs. We know about the safety of Botox in children because it has been widely used even in very young children who suffer from cerebral palsy and are unable to walk unless their stiff leg muscles are relaxed by Botox. Botox was approved by the FDA 26 years ago and some kids have been getting injections for over 20 years and so far there have been no long-term side effects observed.

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Chronic fatigue syndrome sufferers have endured years of neglect and sometimes ridicule. The condition has even been called “yuppie flu”. Informal surveys indicate that half of the doctors do not believe that this is a true physical disease. This is despite the fact that 1 to 2 million Americans have been diagnosed with this condition. In a previous post I mentioned that patients with chronic fatigue are much more likely to suffer from migraines – they occur in 84% of patients. Tension-type headaches were found in 81% and only 4% had no headaches at all.

There is an overwhelming amount of evidence that chronic fatigue syndrome is a physical condition and one of the names that has been used by doctors is Myalgic Encephalomyelitis. The Institute of Medicine recently issued a report, Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness, which proposes a new name – Systemic Exertion Intolerance Disease, or SEID. The name indicates that the main characteristic of the disease is the fact that exertion of any kind – physical, cognitive, or emotional – can affect many different body organs and impair normal functioning and reduce quality of life. The report also states that to make this diagnosis, the symptoms have to be chronic, frequent and moderate or severe in intensity. The experts suggest that patients could be diagnosed with both SEID and Lyme disease, fibromyalgia, or another disease that causes fatigue. Currently, if a patient suffers from Lyme disease or another fatiguing condition, chronic fatigue is not added as a separate disease. The report also noted that the prognosis is not very good – many people continue to suffer from SEID for many years.

Fibromyalgia, another condition which was thought to be purely psychological, now has three medications approved to treat it (Lyrica, Cymbalta, and Savella), which has led more doctors treat it as a real disease. Unfortunately, there are no drugs approved for chronic fatigue or SEID.

Here are the specific diagnostic criteria for SEID established by the Institute of Medicine:
– Reduction or impairment in the ability to carry out normal daily activities, accompanied by profound fatigue
– Post-exertional malaise
– Unrefreshing sleep
In addition, diagnosis requires one of the following symptoms:
– Cognitive impairment
– Orthostatic intolerance (difficulty standing up and being in an upright position).

I would add that to make this diagnosis, other known potential causes of fatigue should be ruled out. These include thyroid disease, anemia, chronic infections (Lyme and other), vitamin B12 and other deficiencies. As mentioned in a previous post, the test for vitamin B12 is not very accurate. Many laboratories list normal levels being between 200 and 1,000. However, many patients with levels below 400, and some even with levels above 400 still have a deficiency. If a deficiency is strongly suspected, additional tests are needed – homocysteine and methylmalonic acid levels.

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Several million Americans suffer from chronic migraines, headaches that occur on at least half of the days and often daily.

A new study suggests one of the way to prevent this disabling disease. In the American Migraine Prevalence and Prevention Study, people with episodic migraines (those occurring on less than half of the day each month) completed the Migraine Treatment Optimization Questionnaire and provided outcome data in 2006 and in 2007. They were asked four questions about the efficacy of their acute migraine therapies and the responses were divided into: very poor, poor, moderate, and maximum treatment efficacy.

Among 5,681 study participants with episodic migraine in 2006, 3.1% progressed to chronic migraine in 2007. Only 1.9% of the group with maximum treatment efficacy developed chronic migraine. Rates of new-onset chronic migraine increased in the moderate treatment efficacy (2.7%), poor treatment efficacy (4.4%), and very poor treatment efficacy (6.8%) groups. The very poor treatment efficacy group had a more than 2-fold increased risk of new-onset chronic migraine compared to the maximum treatment efficacy group.

The authors concluded that inadequate acute treatment efficacy was associated with an increased risk of new-onset chronic migraine over the course of 1 year. They speculated that improving acute treatment outcomes might prevent chronic migraine. However, they also said that reverse causality cannot be excluded, meaning that it is possible that those who would go on to develop chronic migraine had poor response to acute treatment because their headaches were worse and that they would develop chronic migraine regardless of how well their acute treatment worked. However, it makes a lot of sense to assume that effective treatment of individual attacks may prevent headaches from becoming chronic, especially because we know that each migraine attack leaves the brain more excitable for weeks and this makes the next attack more likely.

Effective treatment of acute attacks usually involves the use of triptans, (drugs like sumatriptan, or Imitrex, eletriptan, or Relpax, rizatriptan or Maxalt, and other), although NSAIDs, such as aspirin, iboprofen and other can also help, both alone or in a combination with a triptan. Medications that should not be used are drugs such as Fioricet or Fiorinal (butalbital, caffeine, and acetaminophen / aspirin), codeine, Percocet (oxycodone / acetaminophen), Vicodin (hydrocodone / acetaminophen). These drugs are not only ineffective, but can make it more likely that episodic migraines will turn into chronic. This also applies to other caffeine-containing drugs (Excedrin and other) and even dietary caffeine.

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The new dietary guidelines issued by a government advisory committee have many positive changes from the old guidelines. These include a focus on food rather than nutrients. For example, there is no proposed limit on the intake of cholesterol and eating eggs is encouraged. There is an emphasis on eating less meat and more fruits and vegetables and on limiting sugar intake. All these recommendations apply to headache sufferers as well.

However, the guidelines are advising people to increase their consumption of coffee. They suggest that 3 to 5 cups a day can be part of a healthy diet because there is evidence that coffee may reduce risk of type 2 diabetes and heart disease (and possibly Parkinson’s disease). This is because coffee contains flavonoid compounds that have health benefits. However, coffee and caffeine in general are proven to cause worsening of headaches. As little as 2-3 cups a day can worsen headaches by causing caffeine withdrawal. Flavonoids are present in many fruits and vegetables, so it is not necessary to drink coffee to benefit from these compounds. If you are prone to having headaches it is better to limit your caffeine intake to one cup of coffee a day.

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A new report by Drs. Gfrerer, Maman and their colleagues at the Massachusetts General Hospital in Boston entitled Non-Endoscopic Deactivation of Nerve Triggers in Migraine Headache Patients: Surgical Technique and Outcomes was recently published in the journal Plastic & Reconstructive Surgery. Surgery for refractory migraine headaches was developed by Dr. Bahman Guyuron and others and was reported to benefit between 68 and 95% patients. This surgery involves cutting or freeing up nerves in the scalp that appear to be responsible for triggering migraines. Some surgeons use a laparascopic technique, which involves making only a few small incisions while others do this surgery through conventional incisions. The authors of this new study argue that endoscopic techniques may not be appropriate in many cases since some surgeons have little experience or limited access to the endoscope and in some patients this technique is not practical because the nerves could run in an unusual pattern, which would make them hard to find through a small incision.

This study involved 43 consecutive procedures in 35 patients. All patients completed questionnaires before and 12 months after surgery. The overall positive response rate was 91%. Total elimination of migraine headaches was reported in 51%, greater than 80% resolution of symptoms in 21%, and 28% had resolution between 50-80%. No improvement was reported after 9% of procedures. There were no major adverse events.

The authors concluded that non-endoscopic surgery was safe and effective treatment in select migraine headache patients.

Most headache experts agree that until proven effective in large controlled studies, surgery should be done only as a part of such a large controlled trial. Just like with previous studies of surgery for migraines, this was a small and not a rigorously controlled trial. Placebo response to surgical procedures is usually very high, however it is rarely 90% and the effect rarely lasts 12 months, as it did in this study. Considering these facts, as well as that this study was done at a reputable institution and that this group consisted of refractory patients (those who did not respond to conventional therapy, including Botox), surgery may in fact offer some real benefits to a small group of patients. We need larger and better controlled trials to figure out if that is indeed the case and what type of patients are the best candidates for surgery.

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A report from the Cleveland Clinic and Case Western Reserve describes 22 patients with new daily persistent headaches (NDPH) who were treated with Botox injections.

NDPH is a condition in which the headache begins suddenly without an obvious trigger and persists continuously without a break. Because NDPH is relatively uncommon, there have been no large studies of this condition. Patients with NDPH usually do not exhibit symptoms of migraine, such as throbbing pain, nausea, sensitivity to light, noise or physical activity. Because of its sudden onset, we suspect that these headaches may be the result of a viral or another type of infection. There are no treatments that consistently relieve these headaches, but we usually try all of the drugs and approaches we use in migraines.

A group of doctors from Cleveland, Ohio discovered that while Botox seems to help, only 32% of patients with NDPH showed improvement, confirming the refractory nature of this type of headaches. Twenty one of the 22 patients underwent more than one treatment with Botox and most were given a standard migraine treatment protocol with 155 units injected into 31 sites. The improvement was modest but it did result in headache-free days, which were not observed prior to this treatment. The disability improved slightly and when the improvement did occur, it lasted about 8 weeks. Some of our chronic migraine patients also require Botox injections every 8 to 10 weeks, instead of the usual 12. Considering that we do not have any better treatments, Botox should be offered to patients with NDPH.

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Botox is a very effective treatment for chronic migraines and possibly other types of headaches and pain. However, Botox is an expensive and somewhat unpleasant treatment. Even though Botox helps a high percentage of patients (about 70%) it would be useful if we could predict who is going to respond and who is not.

One of the predictors seems to be the directionality of pain. That is, if patients with migraine who have constricting (imploding) pain or pain localized to the eye seem to respond better than those who have pain that seems to be pushing from inside out (exploding). This is not a very reliable predictor because some people have difficulty categorizing their pain in that way and because even if they do describe it clearly one way or another, this predictor is far from 100% accurate.

In a study just published in the journal Headache a group of Spanish neurologists claim that they have found a predictor with 95% accuracy. They measured blood levels of calcitonin gene-related peptide (CGRP) and found that those with levels of CGRP above a certain number were 28 times more likely to respond to Botox than those with levels below that level.

CGRP has been shown to be very involved in the process of migraine and several drugs and antibodies which block the CGRP receptor appear to be very promising (see my recent blog post on such antibodies). So, it is not very surprising that this correlation between the response to Botox and blood level of CGRP was found. However, this finding needs to be confirmed in a larger group of patients (this study involved 81 patients) and this test needs to become available commercially since now it can be done only in research laboratories.

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