Abstract
Objective
The aim of this study was the assessment of semi-quantified salivary gland dynamic scintigraphy (SGdS) parameters independently and in an integrated way in order to predict primary Sjögren’s syndrome (pSS).
Materials and methods
Forty-six consecutive patients (41 females; age 61 ± 11 years) with sicca syndrome were studied by SGdS after injection of 200 MBq of pertechnetate. In sixteen patients, pSS was diagnosed, according to American-European Consensus Group criteria (AECGc).
Semi-quantitative parameters (uptake (UP) and excretion fraction (EF)) were obtained for each gland. ROC curves were used to determine the best cut-off value. The area under the curve (AUC) was used to estimate the accuracy of each semi-quantitative analysis.
To assess the correlation between scintigraphic results and disease severity, semi-quantitative parameters were plotted versus Sjögren’s syndrome disease activity index (ESSDAI). A nomogram was built to perform an integrated evaluation of all the scintigraphic semi-quantitative data.
Results
Both UP and EF of salivary glands were significantly lower in pSS patients compared to those in non-pSS (p < 0.001). ROC curve showed significantly large AUC for both the parameters (p < 0.05).
Parotid UP and submandibular EF, assessed by univariated and multivariate logistic regression, showed a significant and independent correlation with pSS diagnosis (p value <0.05). No correlation was found between SGdS semi-quantitative parameters and ESSDAI. The proposed nomogram accuracy was 87%.
Conclusion
SGdS is an accurate and reproducible tool for the diagnosis of pSS. ESSDAI was not shown to be correlated with SGdS data.
Clinical relevance
SGdS should be the first-line imaging technique in patients with suspected pSS.
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Acknowledgements
The authors would like to thank Prof Alessandro Giordano for his helpful suggestions and the Nuclear Medicine staff for their support as well as Eda Koxhaku for the English editing.
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Financial funding was not required nor obtained: this research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all the individual participants included in the study.
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Angusti, T., Pilati, E., Parente, A. et al. Semi-quantitative analysis of salivary gland scintigraphy in Sjögren’s syndrome diagnosis: a first-line tool. Clin Oral Invest 21, 2389–2395 (2017). https://doi.org/10.1007/s00784-016-2034-6
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DOI: https://doi.org/10.1007/s00784-016-2034-6