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Assessing the Validity of Transcutaneous Laryngeal Ultrasonography (TLUSG) After Thyroidectomy: What Factors Matter?

  • Endocrine Tumors
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Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Introduction

Although transcutaneous laryngeal ultrasound (TLUSG) is an excellent, noninvasive way to assess vocal cord (VC) function after thyroidectomy, some patients simply have “un-assessable” or “inaccurate” examination. Our study evaluated what patient and surgical factors affected assessability and/or accuracy of postoperative TLUSG.

Methods

Five hundred eighty-one consecutive patients were analyzed. All TLUSGs were done by one operator using standardized technique, whereas direct laryngoscopies (DL) were done by an independent endoscopist to confirm TLUSG findings. Their findings were correlated. TLUSG was “unassessable” if ≥1 VC could not be clearly visualized, whereas it was “inaccurate” if the TLUSG and DL findings were discordant. Demographics, body habitus, neck anthropometry, and position of incision were correlated with assessability and accuracy of TLUSG.

Results

Twenty-nine (5.0 %) patients had “unassessable” VCs; among the “assessable” patients, 29 (5.3 %) patients had “inaccurate” TLUSG. More than one-third (38.5 %) of VC palsies (VCPs) were “inaccurate.” Older age (odds ratio [OR] = 1.055, 95 % confidence interval [CI] 1.016–1.095, p = 0.005), male sex (OR = 13.657, 95 % CI 2.771–67.315, p = 0.001), taller height (OR = 1.098, 95 % CI 1.008–1.195, p = 0.032), and shorter distance from cricoid cartilage to incision (OR = 0.655, 95 % CI 0.461–0.932, p = 0.019) were independent factors for “unassessable” VCs, whereas older age (OR = 1.028, 95 % CI 1.001–1.056, p = 0.040) was the only factor of incorrect assessment.

Conclusions

Older age, male sex, tall in height, and incision closer to the thyroid cartilage were independent contributing factors for unassessable VCs, whereas older age was the only contributing factor for inaccurate postoperative TLUSG. Because more than one-third of VCPs were actually normal, patients labeled as such on TLUSG would benefit from laryngoscopic validation.

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Acknowledgment

This paper was presented as a poster presentation at the Annual Congress of the 2014 American Association of Endocrine Surgeons in Boston, MA.

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Authors and Affiliations

  1. Division of Endocrine Surgery, Department of Surgery, The University of Hong Kong, Queen Mary Hospital, Hong Kong SAR, China

    Kai-Pun Wong MBBS, FRCSEd, Brian Hung-Hin Lang MS(HK), FRACS, Yuk-Kwan Chang MBBS, MRCSEd, Kam Cheung Wong MBBS, MRCSEd & Felix Che-Lok Chow MBBS, MRCSEd

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  1. Kai-Pun Wong MBBS, FRCSEd
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  2. Brian Hung-Hin Lang MS(HK), FRACS
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  3. Yuk-Kwan Chang MBBS, MRCSEd
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  4. Kam Cheung Wong MBBS, MRCSEd
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Corresponding author

Correspondence to Brian Hung-Hin Lang MS(HK), FRACS.

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Wong, KP., Lang, B.HH., Chang, YK. et al. Assessing the Validity of Transcutaneous Laryngeal Ultrasonography (TLUSG) After Thyroidectomy: What Factors Matter?. Ann Surg Oncol 22, 1774–1780 (2015). https://doi.org/10.1245/s10434-014-4162-z

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  • DOI: https://doi.org/10.1245/s10434-014-4162-z

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