NOTE: Today we offer a double feature on the treatment of cervicogenic headache: this post and Dr. Harriet Hall’s post, “When Headaches Are a Pain in the Neck: Spinal Manipulation vs. Mobilization for Cervicogenic Headache.” They complement each other, as well as Dr. Hall’s post from last week on the possible risk of stroke with neck manipulation.
A cervicogenic headache has been defined as a secondary headache (beginning in the suboccipital area) caused by nerve pain referred from a source in the upper cervical spine. According to the American Migraine Foundation, “To confirm the diagnosis of cervicogenic headache, the headache must be relieved by nerve blocks….Treatment includes nerve blocks, physical therapy, exercise, Botox injections, and medication. Physical therapy and an ongoing exercise regime often produce the best outcomes.”1
There are a number of published studies advocating use of upper cervical manipulation as a treatment for cervicogenic headache,2 often without adequate consideration of the danger of such treatment. While upper neck manipulation might sometimes be an effective treatment for a cervicogenic headache, care must be taken to avoid upper cervical manipulative techniques that may pose risk of stroke by damaging vertebral and internal carotid arteries.
Most headaches are of the tension-type variety, often originating in the myofascial structures of the head and neck. There are many other types of headache, some of which can be life-threatening or unbearably painful, none of which are neck related. Headache caused by a leaking brain aneurysm may portend possible rupture of a swollen blood vessel. A migraine or a cluster headache is less serious but can cause agonizing pain. Sudden appearance of neck pain with headache can be a symptom of spontaneous vertebral artery dissection, which can result in a full-blown stroke if aggravated by neck manipulation. When a headache is sudden, severe, or persistent, it is important to have a medical evaluation before concluding that you have a neck-related headache or before submitting to neck manipulation, especially upper cervical manipulation that involves rotation of the atlas on the axis. (more…)
Can neck manipulation (by chiropractors or by other practitioners) cause strokes? Many of us think it can, but definitive proof is lacking. A recently published study looked at the available evidence. A systematic review found a small association between stroke and chiropractic care but concluded that the association was spurious and that there was no evidence for causation. My colleagues and I have written about this subject several times; some of the links are listed here. I certainly agree that there is no definitive evidence for causation, but I think there is evidence to support a strong enough probability of causation to constitute a good reason to avoid neck manipulation. (more…)
There is a bill before the Oregon Legislature, Senate Bill 1535, that:
Allows chiropractic physicians and naturopathic physicians to provide release for athlete who sustained concussion or is suspected of sustaining concussion.
Unfortunately, the Oregon legislature has already granted naturopaths primary care physician status, so I expect this may well pass, despite the fact neither chiropractors nor naturopaths have much reality-based education and training in medicine.
You may wonder, why you should care about what is going on in Oregon? Well, it is likely similar laws are being considered in your state. You might be surprised at the shenanigans going on in your legislature. I was when I looked. To keep informed, go to Legislative Update at the Society for Science-Based Medicine for weekly updates.
Let’s go through the issues: why is it a bad idea for the athletes of the state, most of whom will be children, to be cared for by NDs and DCs? (more…)
Extreme rotation of the atlas on the axis (at the atlantoaxial joint) stretches the vertebral artery. In layman’s terms, 40% of a hanging.
I am off to Chicago for 5 days to wow the SMACC crowd with my ID/SBM acumen. I hope. Given that most of my multiple-personalities do not seem to be able to get any work done, I am forced to write a brief post this week, limited by the battery life on my MacBook Air. Whatever I get down on paper? pixels? RAM? before the battery dies as I fly over the Rockies will be the post. It is times like this I wish I had Gorskian typing skills.
SBM has discussed the many limitations of chiropractic: the low grades for entry into chiropractic school, the inadequate training, their reason d’être, subluxations and their adjustments being divorced from reality, the lack of efficacy of chiropractic for any process beyond low back pain (and even that is no better than safer interventions), the fondness of chiropractors for other useless pseudo-medicines, and their opposition to vaccines.
Hm. When I put it like that chiropractic does appear a little sketchy. But is chiropractic safe? It is a hands-on intervention, for a brief period of time applying the same force to the neck as about 40% of hanging from the neck until dead. So there is certainly the potential for chiropractic to cause harm. (more…)
The risk of suffering a stroke when undergoing aggressive chiropractic manipulation of the neck is not a new concern. We’ve discussed it several times on the pages of Science-Based Medicine over the years, most recently in November of 2014 when Steven Novella covered the death by chiropractor of 30-year-old Jeremy Youngblood, whose fatal brain injury occurred while seeking treatment for a sore neck. For a nice review of cervical manipulation in general, the evidence against its inappropriate use, and an assessment of the literature on this subject, check out prior posts by Dr. Hall and chiropractor Samuel Homola.
I believe that my take on the issue is in line with my fellow SBM authors. There is no role for high velocity, low amplitude (HVLA) thrust-type maneuvers that cause sudden and intense rotation of the neck in any patient, for any reason. It is not effective for neck pain, headache or any other complaint, and it is a proven risk factor for injury to the vertebral arteries and subsequent stroke. Some patients are at higher risk, such as the elderly or those with atherosclerosis or connective tissue disorders, but this type of injury can occur at any age and even in a perfectly healthy individual. (more…)
Old bad studies: Fantastical autopsy results
I found the following quote at “Chiropractic care can treat more than just bad backs” (FYI. Chiropractic can’t):
Luse references a study published in The Medical Times authored by Dr. Henry Windsor [sic], M.D. that showcases the correlation of spinal health to overall wellness. Windsor dissected 75 human cadavers to investigate their causes of death. The study showed that 138 of the 139 diseases of the internal organs that were present were in connection to the misalignments of the vertebrae.
But I was intrigued. So I went to the video tape. Well, the PDF.
It is an interesting read by a physician who was looking for an association between curvature of the spine and visceral pathology.
He had 50 corpses, age unknown, that he dissected, looked at the spine for curvature and then looked for pathology in organs in the same distribution of sympathetic nervous system as the level of the spine curvature.
Chiropractors often deny that neck manipulation can be a primary cause of stroke by injuring vertebral arteries. But according to Jean-Yves Maigne, M.D., head of the Department of Physical Medicine at the Hôtel-Dieu Hospital in Paris, France:
It is now a well established fact that cervical thrust manipulation can harm the vertebral artery. This accident was formerly regarded as very rare, although severe, and related to atherosclerosis. Clinical tests were proposed to detect patients at risk. The problem is now better known. It is no longer attributed to atherosclerosis…but to a dissection of a vertebral artery, a clinical entity observed in younger patients (20-45 years). It remains very rare, but mild symptoms appear to be not so infrequent. Finally, the predicting tests seem to be deprived of any value.1
In 1997, the French Society of Orthopaedic and Osteopathic Manual Medicine (SOFMMOO), following presentations by anatomists, neurologists, radiologists, and practitioners in the field of French Manual Medicine, adopted the neck-manipulation proposals made by Dr. Maigne.1 “Acknowledging the fact that prevention is out of reach,” said Dr. Maigne, “the aim of these recommendations is to reduce the number of (not to say to suppress) rotational cervical thrust manipulations in a targeted population. This population consists mainly in females of less than 50 years old. Five recommendations were developed, in addition to classic contraindications of spinal manipulative therapy.”
The recommendations of the SOFMMOO, dealing with cervical manipulation in general and allowing the use of neck manipulation in special cases, are worth considering since they were reviewed by medical specialists in different disciplines and approved by licensed practitioners who use manual therapy, long before the stroke-neck-manipulation furor reached its peak in the United States.
Can neck manipulation cause strokes? Most MDs and many chiropractors agree that it can, but some chiropractors disagree. The subject has been covered on SBM before: here, here, here, here, here, here, here, here, and here. We keep returning to the subject not because it is a common problem (it isn’t), but because it is such a devastating one, and because the general public is still not aware of the risk.
A 2012 study published in the International Journal Of Clinical Practice “Assessing the risk of stroke from neck manipulation: a systematic review” concluded:
Conclusive evidence is lacking for a strong association between neck manipulation and stroke, but is also absent for no association.
Despite the uncertainty, they thought the association was strong enough to recommend informed consent be obtained and patients be warned that neck manipulation “may” increase the risk of a rare type of stroke.
A new study in the same journal, “Chiropractic and Stroke: Association or Causation?” applies Hill’s criteria of causation to the evidence and concludes that causality has not been determined. The author is Peter Tuchin, a senior lecturer in chiropractic at Macquarie University in Australia, and a known apologist for chiropractic. I agree with him that the existing evidence is inadequate to conclusively determine causality, but I think it supports a high probability of causality, and the alternate explanations he offers to exonerate chiropractors are questionable. And other factors should be considered, like the many “smoking gun” cases and whether there is any conclusive evidence of benefit to set against the possibility of risk. (more…)
Do not trust the cheering, for those persons would shout as much if you or I were going to be hanged.”
~ Oliver Cromwell
In the blogosphere, the proponents of chiropractic often quote the following paper, with the abstract:
Risk of Vertebrobasilar Stroke and Chiropractic Care
Results of a Population-Based Case-Control and Case-Crossover Study
Spine. 2008 Feb 15;33(4 Suppl):S176-83.
by Cassidy JD, Boyle E, Côté P, He Y, Hogg-Johnson S, Silver FL, Bondy SJ.
Why be different? Here is the abstract.
STUDY DESIGN: Population-based, case-control and case-crossover study. OBJECTIVE: To investigate associations between chiropractic visits and vertebrobasilar artery (VBA) stroke and to contrast this with primary care physician (PCP) visits and VBA stroke.
SUMMARY OF BACKGROUND DATA: Chiropractic care is popular for neck pain and headache, but may increase the risk for VBA dissection and stroke. Neck pain and headache are common symptoms of VBA dissection, which commonly precedes VBA stroke.
METHODS: Cases included eligible incident VBA strokes admitted to Ontario hospitals from April 1, 1993 to March 31, 2002. Four controls were age and gender matched to each case. Case and control exposures to chiropractors and PCPs were determined from health billing records in the year before the stroke date. In the case-crossover analysis, cases acted as their own controls.
RESULTS: There were 818 VBA strokes hospitalized in a population of more than 100 million person-years. In those aged <45 years, cases were about three times more likely to see a chiropractor or a PCP before their stroke than controls. Results were similar in the case control and case crossover analyses. There was no increased association between chiropractic visits and VBA stroke in those older than 45 years. Positive associations were found between PCP visits and VBA stroke in all age groups. Practitioner visits billed for headache and neck complaints were highly associated with subsequent VBA stroke.
CONCLUSION: VBA stroke is a very rare event in the population. The increased risks of VBA stroke associated with chiropractic and PCP visits is likely due to patients with headache and neck pain from VBA dissection seeking care before their stroke. We found no evidence of excess risk of VBA stroke associated chiropractic care compared to primary care.