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The efficiency of acoustic radiation force impulse (ARFI) elastography in the diagnosis and staging of carpal tunnel syndrome

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Abstract

Objectives

The aim of the present study was to quantify the stiffness of the median nerve (MN) at the carpal tunnel inlet by acoustic radiation force impulse (ARFI) elastography and to evaluate whether ARFI can be used in diagnosis and staging of carpal tunnel syndrome (CTS).

Methods

Sonographic examinations of 96 wrists in 50 patients were included in the study. The cross-sectional area and stiffness of the MN were quantitatively measured by B-mode ultrasonography (USG) and ARFI. The findings of CTS were assigned to four groups: (I) normal (n = 21), (II) mild (n = 39), (III) moderate (n = 38), and (IV) severe (n = 19). The differences between CTS patients and controls and the differences in electrodiagnostic tests among subgroups were statistically compared. ROC analysis was performed to determine the cut-off values between subgroups.

Results

Bilateral CTS was present in 46 patients (92 wrists) and unilateral CTS in four patients. Of the 96 nerves in the 50 symptomatic “idiopathic CTS” patients (48 women, 2 men; mean age 45.9 years, range 23–73 years), 39 (40.4%) were mild, 38 (39.8%) were moderate, and 19 (19.8%) were severely affected. When compared to controls, MN stiffness was significantly higher in the CTS group (P < 0.001); furthermore, it was higher in the severe or extreme severity group than the mild or moderate severity group (P < 0.001). A 3.250 m/s cut-off value on ARFI revealed sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of 81, 82, 95.1, 50, and 82%, respectively.

Conclusion

The MN stiffness measured by ARFI elastography is significantly higher in patients with CTS then in controls. ARFI elastography appears to be a highly efficient imaging modality for the diagnosis and staging of these patients.

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Correspondence to Harun Arslan.

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Ethical statements

This study was approved by the Yuzuncu Yil University ethics committee. Written informed consent was obtained from all individuals included in the study. This manuscript has not been published and is not under consideration for publication elsewhere. There is no overlap of our present work with any previously published studies.

Conflict of interest

The authors declare that they have no conflicts of interest or industry support to disclose.

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Arslan, H., Yavuz, A., İlgen, F. et al. The efficiency of acoustic radiation force impulse (ARFI) elastography in the diagnosis and staging of carpal tunnel syndrome. J Med Ultrasonics 45, 453–459 (2018). https://doi.org/10.1007/s10396-017-0857-7

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  • DOI: https://doi.org/10.1007/s10396-017-0857-7

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