Evaluation of two 99mTc-DTPA radioaerosols with different characteristics in lung ventilation studies

Evaluation of two 99mTc-DTPA radioaerosols with different characteristics in lung ventilation studies

Author Silveira, C.m. Autor UNIFESP Google Scholar
Castiglioni, M.l.v. Autor UNIFESP Google Scholar
Torres, I.c.g. Autor UNIFESP Google Scholar
Medeiros, Regina Bitelli Autor UNIFESP Google Scholar
Jardim, José Roberto Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Two radioaerosol preparations, TechneScan®-DTPA (99mTc-DTPA, 40 mCi/3 ml; IPEN-CNEN, São Paulo, SP, Brazil) and TechneScan®-DTPA/AEROSOL (99mTc-DTPA/A, 15 mCi/1.5 ml with 0.5 ml ethanol; Mallinckrodt Medical, St. Louis, MO, USA), were compared in pulmonary ventilation studies in terms of total radiocounts and clearance after inhalation. An aerosol with ethanol is supposed to better distribute the radioparticles in the lungs. Twenty normal nonsmoking volunteers (10 men and 10 women), mean age of 23.2 years (range: 20 to 35 years), were studied. Images were obtained immediately and 30, 60 and 90 min after inhalation. Total and regional counts were obtained and the clearance half-lives of both lungs were determined. There was no difference in total counts between the two types of radioaerosol at any time (mean of ~188,000 cpm for male and female subjects at time zero in both aerosols). The highest count was obtained in the middle region of both lungs (P<0.001) with both preparations. The clearance half-life did not differ between aerosols (mean of ~80-88 min for male and female subjects for both aerosols). Small nonsignificant regional differences were observed. No differences between genders or between right and left lung were observed. 99mTc-DTPA/A generated the highest output of radioaerosol. 99mTc-DTPA with alcohol costs approximately five times more than the aerosol without alcohol. The present results show that either kind of aerosol may be adopted routinely for use in pulmonary examinations without affecting diagnosis. We suggest that the amount of 740 mBq (20 mCi) of 99mTc-DTPA in 1.5 ml saline can be used for routine examinations resulting in reduction of costs in pulmonary ventilation studies without diagnostic impairment.
Keywords Pulmonary ventilation
Pulmonary clearance
Radioaerosol
99mTc-DTPA
Language English
Date 2003-10-01
Published in Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 36, n. 10, p. 1333-1340, 2003.
ISSN 0100-879X (Sherpa/Romeo, impact factor)
Publisher Associação Brasileira de Divulgação Científica
Extent 1333-1340
Origin http://dx.doi.org/10.1590/S0100-879X2003001000009
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000185906900010
SciELO ID S0100-879X2003001000009 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/1886

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