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Vertebral artery flow and cervical manipulation: an experimental study.

P B Licht¹, H W Christensen, P Svendensen

¹Department of Clinical Physiology and Nuclear Medicine, Odense University Hospital, Denmark.

Journal of Manipulative and Physiological Therapeutics

|October 16, 1999

Summary

Cervical manipulation temporarily increases vertebral artery blood flow. This study developed an experimental model to investigate blood flow changes during spinal manipulation therapy, finding a modest, short-lived effect on vertebral artery volume flow.

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Area of Science:

Biomedical Engineering
Neuroscience
Vascular Biology

Background:

Spinal manipulation therapy (SMT) is widely used for spinal dysfunction.
Cerebrovascular accidents are a feared complication of SMT.
Limited research exists on vertebral artery hemodynamics during cervical manipulation.

Purpose of the Study:

Develop an experimental model to study vertebral artery hemodynamics.
Investigate volume blood flow changes during cervical spine manipulation.
Assess blood flow during premanipulative testing.

Main Methods:

Experimental study in a university biomedical laboratory.
Exposed vertebral arteries in 8 adult pigs.
Measured simultaneous volume blood flow using transit-time flowmetry.

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Main Results:

Cervical manipulation significantly increased vertebral artery volume blood flow for 40 seconds.
Blood flow returned to baseline in under 3 minutes.
No significant changes in volume flow were observed during premanipulative testing (DeKleyn's test).

Conclusions:

An experimental model for investigating vertebral artery hemodynamics during biomechanical interventions was developed.
Cervical manipulation has a modest and transient effect on vertebral artery volume flow.
The model can be used to assess strain on vertebral arteries during different SMT techniques.