Journal
MUSCLE & NERVE
Volume 57, Issue 5, Pages 766-771Publisher
WILEY
DOI: 10.1002/mus.25993
Keywords
high-resolution ultrasound; interrater agreement; reference values; side-to-side difference; vagus nerve
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IntroductionReported sonographic reference values for the vagus nerves (VNs) vary greatly. We aimed to generate reference values in a large cohort and examine intrarater, interrater, and across-ultrasound systems agreement. MethodsThe VNs of 60 healthy subjects were examined by 2 sonographers and with 2 ultrasound systems. Cross-sectional areas (CSAs) of each VN were assessed at the level of the carotid sinus [proximal measurement level (ML)] and thyroid gland (distal ML). ResultsMean VN CSA was significantly larger on the right side (proximal ML: 2.70.6mm(2) vs. 2.1 +/- 0.5mm(2); distal ML: 2.6 +/- 0.6mm(2) vs. 1.9 +/- 0.4mm(2)). VN CSA decreased with increasing age. There were good intrarater, interrater, and across-ultrasound systems agreements. DiscussionThe right VN CSA is significantly larger than the left. These side- and age-specific reference values for the VN may be useful for future studies. Muscle Nerve57: 766-771, 2018
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