Hg. Pasker et al., SHORT-TERM VENTILATORY EFFECTS IN WORKERS EXPOSED TO FUMES CONTAININGZINC-OXIDE - COMPARISON OF FORCED OSCILLATION TECHNIQUE WITH SPIROMETRY, The European respiratory journal, 10(7), 1997, pp. 1523-1529
Following the occurrence of metal fume fever in some subjects after th
e installation of an electric furnace in a steel plant, a survey was u
ndertaken to examine whether subjects exposed to fumes containing zinc
oxide would exhibit a detectable impairment in ventilatory function,
and whether a forced oscillation technique (FOT) was more suited for t
his detection than conventional spirometry. Pulmonary function measure
ments were made in 57 exposed workers (production or maintenance) and
55 nonexposed workers (maintenance or strandcasting department) at the
beginning and near the end of a work shift (day or night), Maximal ex
piratory volumes and flows were measured by means of a pneumotachograp
h, and respiratory resistance (Rrs) and reactance at various frequenci
es by means of a FOT, These measurements were repeated 1 day later. Du
ring the day shift, there were no significant differences in pulmonary
function between exposed and control workers, However, during the nig
ht shift, an influence of exposure on pulmonary function was revealed
both by spirometry and by FOT: workers exposed at night showed a sligh
t decrease in vital capacity (VC) and in forced expiratory volume in o
ne second (FEV1), and a decline in respiratory resistance (Rrs) with o
scillation frequency, that were more marked than in unexposed subjects
, In contrast to the frequency dependence of Rrs, the changes of lung
volumes and expiratory flows were related to differences in initial va
lues between exposed and nonexposed workers. The decrease in FEV1 was
maintained the day after exposure. The forced oscillation technique pr
oved at least as sensitive as spirometry to detect small across-shift
changes in ventilatory function, Although the effects on pulmonary fun
ction were small, it is likely that they represent a subclinical respo
nse to the inhalation of small quantities of zinc oxide.