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  • Title: Safety of chiropractic manipulation of the cervical spine: a prospective national survey.
    Author: Thiel HW, Bolton JE, Docherty S, Portlock JC.
    Journal: Spine (Phila Pa 1976); 2007 Oct 01; 32(21):2375-8; discussion 2379. PubMed ID: 17906581.
    Abstract:
    STUDY DESIGN: Prospective national survey. OBJECTIVE: To estimate the risk of serious and relatively minor adverse events following chiropractic manipulation of the cervical spine by a sample of U.K. chiropractors. SUMMARY OF BACKGROUND DATA: The risk of a serious adverse event following chiropractic manipulation of the cervical spine is largely unknown. Estimates range from 1 in 200,000 to 1 in several million cervical spine manipulations. METHODS: We studied treatment outcomes obtained from 19,722 patients. Manipulation was defined as the application of a high-velocity/low-amplitude or mechanically assisted thrust to the cervical spine. Serious adverse events, defined as "referred to hospital A&E and/or severe onset/worsening of symptoms immediately after treatment and/or resulted in persistent or significant disability/incapacity," and minor adverse events reported by patients as a worsening of presenting symptoms or onset of new symptoms, were recorded immediately, and up to 7 days, after treatment. RESULTS: Data were obtained from 28,807 treatment consultations and 50,276 cervical spine manipulations. There were no reports of serious adverse events. This translates to an estimated risk of a serious adverse event of, at worse approximately 1 per 10,000 treatment consultations immediately after cervical spine manipulation, approximately 2 per 10,000 treatment consultations up to 7 days after treatment and approximately 6 per 100,000 cervical spine manipulations. Minor side effects with a possible neurologic involvement were more common. The highest risk immediately after treatment was fainting/dizziness/light-headedness in, at worse approximately 16 per 1000 treatment consultations. Up to 7 days after treatment, these risks were headache in, at worse approximately 4 per 100, numbness/tingling in upper limbs in, at worse approximately 15 per 1000 and fainting/dizziness/light-headedness in, at worse approximately 13 per 1000 treatment consultations. CONCLUSION: Although minor side effects following cervical spine manipulation were relatively common, the risk of a serious adverse event, immediately or up to 7 days after treatment, was low to very low.
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