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Effects of formaldehyde and acetaldehyde inhalation on rat pulmonary mechanics

✍ Scribed by Paulo Hiláro Nascimento Saldiva; Marina Pires do Rio Caldeira; Eduardo Massad; Débora Fernandes Calheiros; Luiza Maria Nunes Cardoso; György Miklós Böhm; Carmen Diva Saldiva

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
475 KB
Volume
5
Category
Article
ISSN
0260-437X

No coin nor oath required. For personal study only.

✦ Synopsis

Two groups of 12 male Wistar rats received either 243 ppm of acetaldehyde or 5.7 ppm of formaldehyde for 8 h a dry, 5 days a week during 5 weeks. These levels represent three times the threshold limit values (TLV) for these substances in Brazilian legislation. The animals were evaluated by pulmonary function tests before and after exposure to the pollutants. The data obtained from these rats were compared with those of 12 controls, housed in identical conditions for the same length of time but breathing normal air. The results showed an increase of the functional residual capacity, residual volume, total lung capacity and respiratory frequency in the rats exposed to acetaldehyde atmosphere. The animals exposed to formaldehyde did not present pulmonary function alterations when compared with the controls. The damage caused by acetaldehyde to the peripheral regions of the lung parenchyma, affecting small airways or altering pulmonary elastic properties, is discussed. It is suggested that the Brazilian TLV for acetaldehyde (78 ppm) is not as safe as that for formaldehyde (1.6 ppm).

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