A discussão de Katie May continua


Gerard W. Clum, DC
Diretor, The Octagon, Life University
Comitê Executivo, The Foundation for Chiropractic Progress

Relatório de fontes de mídia sobre litígios trazidos pela propriedade da Sra. Katie May

�News stories have recently surfaced in high profile settings such as Good Morning America and TMZ about plans of the estate of Ms. Katie May to file a wrongful death claim against a Southern California chiropractor

•It is our understanding that a lawsuit has been filed, but, to date, has not been served on the chiropractor in question nor to his representatives

•Regardless, representatives of the family and estate of Ms. May have brought the matter back before the public with claims of negligence and misconduct

Respondendo aos pedidos de mídia para comentários

•The Foundation for Chiropractic Progress (F4CP) recommends that if you are approached or requested to make comment on the Katie May situation, unless you are intimately familiar with the details of this particular case and the subject of any possible association between cervical spine adjusting and the development of cervical artery dissection and stroke, that you refer the matter to your state chiropractic association, national chiropractic association or to the F4CP for comment

Respondendo às perguntas de seus pacientes

•If you are not up to date on the current literature on the subject of any possible association between cervical spine adjusting and cervical artery dissection and stroke, take this opportunity to catch yourself up on these matters.

• A number of excellent resources exist to assist you in this regard. Visit the websites of NCMIC or ChiroSecure for their recommendations, attend in-person or online CE offerings addressing this area, review presentations available through various chiropractic colleges and associations as well as F4CP on this subject

Demografia: Considerações de escova larga

A 30,000 foot perspective—the math

• U.S. population: 321,000,000
• Strokes in a year in the U.S.: 750,000*
• VAD occurs at a rate of: 1/100,000 pop.* • VADs annually in the U.S.: 3,210
•% of pop. To visit a DC in U.S.: 10%
• # of VAD patients likely to see a DC: 320

• 64,000 DCs in U.S., if evenly distributed then 1/200 * Incidence rate estimates vary, this is the most conservative number

Demografia: Considerações de escova larga

Visão geral do acidente vascular cerebral - dados anuais dos EUA

• 750,000 strokes annually
• 80% are ischemic (clot related)
• 20% are hemorrhagic (bleed related)
• 3,210 VADs per year
• 1 of every 233 strokes is related to a VAD (750,000/3,210) • 75% of VAD related strokes make a good recovery
• 5% of VAD related strokes (160) result in death (3,210/20)

Demografia: Considerações de escova larga

Visão Geral do Curso - Dados de incidência VAD

• Olmstead County, Wisconsin incidence 0.97/100,000 population
• Ontario, Canada incidence of 1/133,000 or 0.75/100,000
• Saskatchewan, Canada incidence of 0.855/100,000
• Department of Veteran’s Affairs data incidence of 0.791/100,000
• United Healthcare data, reflecting 5% of U.S. population 0.32/100,000


Subintimal vs. Subadvencial

Aneurisma e lúmen do vaso

Conceitos-chave em epidemiologia

• Association-the statistical relation between two or more events, characteristics, or other variables.*

• Causation/Cause of disease-a factor (e.g., characteristic, behavior, or event) that directly influences the occurrence of a disease. Reducing such a factor among a population should reduce occurrence of the disease.*

• Protopathic Bias-is used if the first symptoms of the outcome of interest are the reasons for use of treatment. For instance, a drug given for abdominal pain may be associated erroneously with hepatic injury, as abdominal pain may be one of the prodromal symptoms.**

Conceitos-chave em epidemiologia

• Cervical artery dissection causes neck pain and headache, neck pain and headache are commonly seen by chiropractors. Therefore there is an association between cervical artery dissection and chiropractic care.

• Claims have been made that cervical spine adjusting “causes” cervical artery dissection based upon case reports and case series. Epidemiologically, these types of studies CANNOT be used to establish causation. Studies capable of assigning causation, i.e., case- control and case-cross-over studies DO NOT support the assertion of causation related to chiropractic care

Conceitos-chave em epidemiologia

• Protopathic bias is present if the first symptoms of the outcome of interest are the reasons for use of treatment.

• In the case of cervical artery dissection, the first symptoms are often neck pain and headache and neck pain and headache are reasons patients seek chiropractic care.

• Protopathic bias speaks to the reality that the initial symptom (neck pain and headache) is the harbinger of the problem, rather than the problem being created by the way in which the symptoms are addressed (cervical spine adjusting)

Considerações Causal da Cadeia

• Pre-2000s perspective

O paciente se apresenta para cuidados de dor no pescoço e / ou dor de cabeça->
O quiroprático fornece ajuste cervical-> O paciente desenvolve sinais de acidente vascular cerebral relacionado à dissecção-> O quiroprático causou a dissecção e acidente vascular cerebral

Perspectiva pós-2000

Dissecações do paciente-> Dissecção produz dor no pescoço e / ou dor de cabeça-> Paciente procura atendimento de MD ou CD-> Paciente apresenta complicações da dissecção, na forma de acidente vascular cerebral, independentemente do tipo de cuidado prestado

Suporte de Literatura para a Perspectiva Pós-2000

Risco de AVC Vertebrobasilar e Cuidados Quiropraxia; Resultados de um estudo de caso-controle baseado em população e Case-Crossover, J. David Cassidy, DC, PhD, DrMedSc, et al. SPINE (2008) 33: 45, S176-S183

Conclusão. O acidente vascular cerebral VBA é um evento muito raro na população. O risco aumentado de acidente vascular cerebral VBA associado a visitas de quiropraxia e PCP é provavelmente devido a pacientes com dor de cabeça e dor de garganta da dissecação de VBA que procuram cuidados antes de seu acidente vascular cerebral. Não encontramos evidência de risco excessivo de cuidados quirrônicos associados a acidente vascular cerebral AVV em comparação com cuidados primários.

Suporte de Literatura para a Perspectiva Pós-2000

Chiropractic care and the risk of vertebrobasilar stroke: results of a case–control study in U.S. commercial and Medicare Advantage populations; Kosloff et al. Chiropractic & Manual Therapies (2015) 23:19

Conclusões: Não encontramos associação significativa entre a exposição ao tratamento quiroprático e o risco de acidente vascular cerebral VBA. Concluímos que a manipulação é uma causa improvável de acidente vascular cerebral VBA. A associação positiva entre as visitas de PCP e o acidente vascular cerebral VBA é provavelmente devido a decisões do paciente para buscar cuidados para os sintomas (dor de cabeça e dor no pescoço) da dissecção arterial. Concluímos ainda que o uso de visitas de quiropraxia como medida da exposição à manipulação pode resultar em estimativas não confiáveis ​​da força da associação com a ocorrência de acidente vascular cerebral VBA

Suporte de Literatura para a Perspectiva Pós-2000

Revisão sistemática e meta-análise do tratamento quiroprático e dissecção da artéria cervical: nenhuma evidência de causalidade; Church EW, Sieg EP, Zalatimo O, et ai. (Fevereiro 16, 2016) Cureus 8 (2): e498.

Conclusões: nossa revisão sistemática revelou que a qualidade da literatura publicada sobre a relação entre manipulação quiroprática e CAD é muito baixa. Uma meta-análise de dados disponíveis mostra uma pequena associação entre a manipulação do pescoço quiroprático e CAD. Descobrimos evidências de risco considerável de viés e confusão nos estudos disponíveis. Em particular, a associação conhecida de dor de garganta tanto com dissecção da artéria cervical quanto com manipulação quiroprática pode explicar a relação entre manipulação e CAD. Não há evidências convincentes para apoiar um nexo de causalidade, e a crença infundada na causação pode ter consequências terríveis. (Enfase adicionada)

Principais considerações clínicas

•This is not limited to what happens in your office, this is more about who and what walks through the door of your office

•If this is not limited to what happens in your office then your technique approach becomes much less significant to this problem crossing your path

•If this is about who and what walks into your office your concerns should, first and foremost, be the evaluation of the presentation of the patient through your case history and physical examination

História e questões físicas

• History

• Sudden onset neck pain and/or headache with no apparent origin

• Character, location and duration of the pain

• Previous occurrences of the same or very similar pain

• Patient relating “pain unlike any I have ever had before” and/or “worst pain I have ever had”

• Any sign of Cranial Nerve involvement or Cerebellar-related dysfunction

• Any familial history of collagen disorders—Marfan’s, Ehler- Danlos, Osteogenesis Imperfecta, Autosomal dominant polycystic kidney disease, fibromuscular dysplasia

• Any family history of arterial dissection, aneurysm, or related problems

História e Física

• Physical exam considerations

• Basic neurologic examination including motor, sensory and cerebellar functions

• Cranial nerve testing
• Range-of-motion testing
• Listen for a bruit on the anterior at the base of the neck

• Provocative testing

• George’s test, de Kleyne’s test etc
• Too many false positives and too many false negatives to be meaningful
• There are no practical pre-adjustment screening test for arterial patency and competence

O que procurar em particular

•5 D’s, the 3 N’s and an A

• D’s
• Dizziness, diplopia, dysarthria, dysphagia and drop attacks

• N’s
• Nausea, numbness and nystagmus

• Ataxia

Abordagem para os achados

•I am not suggesting that everyone who is nauseous or has numbness or is dizzy is in need of referral for additional evaluation

•I am suggesting that the symptoms be observed and considered and a referral decision made based on the picture being presented

• For example, nausea would be rather non-specific in this consideration as compared to dysarthria, dysphagia or drop attacks

• Use your judgment and then proceed cautiously in terms of referral, initiating care etc.


•Having a good relationship with a local neurologist is very helpful. Often when referring a patient cold the issue of CAD will not be as high on their index of suspicion as yours. If you have a rapport with a neurologist your perspectives will be far more likely to be considered more fully

•If you feel the patient may be in the process of dissection and/or stroke at presentation, during evaluation or following care you must take charge, call 911 and seek emergency transport. If the patient objects, let them object to EMS. Do not allow them to self transport or to be transported by family/friends/your office staff etc


•If a patient appears to have a cervical artery related issue do not adjust them

•If a patient appears to be developing a cervical artery related issue during evaluation, stop the evaluation and do not adjust them

•If a patient appears to be developing cervical artery related issues following an adjustment do not readjust them at that time

•If a patient appears to be developing cervical artery related problems at any time under your control/care do not leave them to attend to anything other than their needs


•The literature is very supportive of our perspectives but it does not give us the ability to say “cervical spine adjustments cannot cause an arterial dissection”. It does give us considerable support that it is an “unlikely cause of VBA stroke” (Kosloff, 2015), “There is no convincing evidence to support a causal link between chiropractic manipulation and CAD (Church, 2016) and “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.” (Cassidy, 2008)

E quanto ao consentimento informado

•Check the requirements of your respective Board of Chiropractic Examiners for specific obligations in law, rule or policy

•Do you want to be right or do you want to uncomplicate your professional life?

• You can make a good argument, that in the presence of “no excess risk” that an informed consent is not needed

• An opposing argument can be made that while there is no excess risk, there is still risk and therefore informed consent should be provided

• An informed consent, properly delivered can remove a potential cause of action against the provider

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