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Evaluation of alveolar clearance by Tc-99m DTPA radioaerosol inhalation scintigraphy in welders

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Abstract

Objectives

The welding process produces metal fumes and gases which may affect respiratory health. Technetium-99m diethylenetriaminepentaacetic acid (Tc-99m DTPA) dynamic lung scanning is an easy, noninvasive method to assess disorders of alveolar-capillary barrier permeability secondary to epithelial damage. We aimed to investigate the alveolar clearance by Tc-99m DTPA radioaerosol inhalation scintigraphy in welders, to assess additive effects of exposure to welding fumes and cigarette smoking on clearance rate of alveolar epithelium and to determine the correlation between Tc-99m DTPA aerosol lung scintigraphy and spirometric measurements.

Methods

Nine nonsmoking welders, 9 smoking welders, and a control group of 6 nonsmokers and 6 smokers were accepted to the study. Tc-99m DTPA radioaerosol inhalation scintigraphy was performed in all subjects. Clearance half time (T1/2) was calculated by placing a monoexponential fit on the curves. Penetration index (PI) was also calculated on the first minute image. Pulmonary function tests of welders and control group were compared

Results

The mean T1/2 values of Tc-99m DTPA of the nonsmoking welders were significantly higher than those of the nonsmoking control group (82.1 ± 24.3 min and 48.1 ± 9.7 min, respectively; p = 0.003). The mean T1/2 values of Tc-99m DTPA of the smoking welders were higher than those of the smoking control group (53.3 ± 24.5 min and 44.5 ± 9.7 min, respectively; p = 0.510). PI of the nonsmoking welders was significantly higher than that of the nonsmoking control group (0.46 ± 0.38 and 0.39 ± 0.46 respectively; p = 0.004). PI of the smoking welders was significantly higher than that of smoking control group (0.43 ± 0.38 and 0.37 ± 0.45, respectively; p = 0.019). There was a negative correlation between T1/2 value and FEV1% (r = -0.468, p = 0.016), FVC% (r = -0.442, p = 0.024) and FEF25-75% (r = -0.391, p = 0.048) in the welders and control group. No statistically significant differences were found in the values of the standard pulmonary function tests of any of the subjects.

Conclusions

Welding seems to decrease alveolar clearance which causes an increase in the penetration index. This was considered to be due to fibrotic changes and increased number of alveolar macrophages induced by welding fumes.

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Authors and Affiliations

  1. Department of Nuclear Medicine, Afyon Kocatepe University Medical Faculty, Afyonkarahisar, Turkey

    Eser Kaya

  2. Department of Pulmonary Disease, Afyon Kocatepe University Medical Faculty, Afyonkarahisar, Turkey

    Fatma Fİdan, Mehmet Ünlü, Murat Sezer & Levent Tetİk

  3. Department of Radiology, Afyon Kocatepe University Medical Faculty, İnönü Bulvari, 03200, Afyonkarahisar, Turkey

    Murat Acar

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  1. Eser Kaya
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  2. Fatma Fİdan
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Correspondence to Eser Kaya.

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Kaya, E., Fİdan, F., Ünlü, M. et al. Evaluation of alveolar clearance by Tc-99m DTPA radioaerosol inhalation scintigraphy in welders. Ann Nucl Med 20, 503–510 (2006). https://doi.org/10.1007/BF03026813

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  • DOI: https://doi.org/10.1007/BF03026813

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