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Despite the possibility that the methodological difference of this salivagram may influence the results for detection rate, there has been no study on the effect of the solution volume on detection rate. Moreover, to date, since the introduction of the nucleotide salivagram, there has been a tendency that a constant solution volume and nucleotide dose is not used in studies. Therefore, the aim of this study is to investigate the effect of solution volume on the detection rate of a salivagram in patients with brain lesion, and to determine the optimal solution volume of salivagram. We retrospectively reviewed clinical data and solution volume of radionuclide used in the salivagram of 77 patients with dysphagia, and the patients were divided into 2 groups according to the solution volume of the radionuclide (Group A-0.1 mL vs Group B-0.5 mL). Although, there was no significant difference between 2 groups in clinical data, there was a statistically significant difference in the detection rate of salivary aspiration between the 2 groups (3.3% vs 19.1%). Even a small difference of the solution volume of radionuclide in salivagram can affect the detection rate of salivary aspiration in patients with brain lesion. Further study with various solution volumes of radionuclide is warranted to determine the optimal solution volume of the radionuclide salivagram.

The effect of radionuclide solution volume on the detection rate of salivary aspiration in the radionuclide salivagram