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Related Experiment Videos

Rotation: a valid premanipulative dizziness test? Does it predict safe manipulation?

K M Refshauge1

  • 1School of Physiotherapy, Faculty of Health Sciences, University of Sydney, Lidcombe, Australia.

Journal of Manipulative and Physiological Therapeutics
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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Cervical spine rotation affects blood flow velocity in vertebral and internal carotid arteries. This finding is crucial for patients undergoing cervical manipulation with potential vascular issues.

Area of Science:

  • Vascular Ultrasound
  • Cervical Spine Biomechanics
  • Neurovascular Assessment

Background:

  • Cervical spine rotation is sometimes used to assess vertebral artery (VA) and internal carotid artery (ICA) patency.
  • The hemodynamic effects of cervical rotation on these critical extracranial vessels require further investigation.

Purpose of the Study:

  • To evaluate the diagnostic validity of cervical spine rotation for assessing the patency of vertebral arteries (VAs) and internal carotid arteries (ICAs).

Main Methods:

  • A descriptive study involving 20 healthy volunteers was conducted.
  • Duplex Doppler ultrasound measured blood flow velocity in the VAs and ICAs at neutral, 45 degrees, and full contralateral cervical rotation.
  • Blood pressure and heart rate were monitored for hemodynamic stability.

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Main Results:

  • A significant trend showed increased blood velocity at 45 degrees contralateral rotation and decreased velocity at full rotation (p < .01).
  • This trend varied between vessels; the right VA showed decreased velocity with rotation, while the right ICA showed continuous increase.
  • Inconsistent patterns across vessels indicate complex hemodynamic responses to rotation.

Conclusions:

  • Sustained cervical rotation demonstrably influences blood velocity in extracranial vessels.
  • These findings have potential implications for managing patients with abnormal blood flow considered for cervical manipulation therapies.