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Accuracy of ultrasound-guided nerve blocks of the cervical zygapophysial joints. | LitMetric

Accuracy of ultrasound-guided nerve blocks of the cervical zygapophysial joints.

Anesthesiology

University Department of Anesthesiology and Pain Therapy, University of Bern, Inselspital, Bern, Switzerland.

Published: August 2012

AI Article Synopsis

  • The study aimed to evaluate the accuracy of ultrasound-guided nerve blocks for cervical zygapophysial joints, comparing it with the standard fluoroscopic method.
  • A total of 60 volunteers underwent the procedure, with a high overall agreement of 87% between ultrasound and fluoroscopic assessments, though accuracy varied by nerve level.
  • The findings indicate that ultrasound is a reliable technique for most cervical nerve blocks, except for the C7 medial branch, where accuracy was lower.

Article Abstract

Background: Cervical zygapophysial joint nerve blocks typically are performed with fluoroscopic needle guidance. Descriptions of ultrasound-guided block of these nerves are available, but only one small study compared ultrasound with fluoroscopy, and only for the third occipital nerve. To evaluate the potential usefulness of ultrasound-guidance in clinical practice, studies that determine the accuracy of this technique using a validated control are essential. The aim of this study was to determine the accuracy of ultrasound-guided nerve blocks of the cervical zygapophysial joints using fluoroscopy as control.

Methods: Sixty volunteers were studied. Ultrasound-imaging was used to place the needle to the bony target of cervical zygapophysial joint nerve blocks. The levels of needle placement were determined randomly (three levels per volunteer). After ultrasound-guided needle placement and application of 0.2 ml contrast dye, fluoroscopic imaging was performed for later evaluation by a blinded pain physician and considered as gold standard. Raw agreement, chance-corrected agreement κ, and chance-independent agreement Φ between the ultrasound-guided placement and the assessment using fluoroscopy were calculated to quantify accuracy.

Results: One hundred eighty needles were placed in 60 volunteers. Raw agreement was 87% (95% CI 81-91%), κ was 0.74 (0.64-0.83), and Φ 0.99 (0.99-0.99). Accuracy varied significantly between the different cervical nerves: it was low for the C7 medial branch, whereas all other levels showed very good accuracy.

Conclusions: Ultrasound-imaging is an accurate technique for performing cervical zygapophysial joint nerve blocks in volunteers, except for the medial branch blocks of C7.

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Source
http://dx.doi.org/10.1097/ALN.0b013e3182605e11DOI Listing

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