Distribution and trends in mesothelioma mortality in Italy from 1974 to 2006.

PURPOSE: Using the epidemiological data of pleural cancer mortality, the authors estimated time trends and distribution of malignant mesothelioma in Italy during the period 1974-2006. METHODS: To describe temporal trends of the standardized mortality ratios (SMRs) in all the 20 Italian regions, we applied the Joinpoint Regression Model, developed by the National Cancer Institute (USA). The 107 provincial SMRs are represented on maps by using the Arcview GIS software (version 3.2). RESULTS: The high values from mesothelioma mortality in construction and shipbuilding sectors, previously reported, are confirmed by our analyses. Furthermore, data show that the annual percentage change is still growing: statistically significant increments in time trends are observed for 11 of 20 Italian regions. Of additional concern has been the identification of changes in 9 of 20 trends partially due to the misdiagnosis in the past. CONCLUSIONS: Given the long latency of mesothelioma, preventive and legal measures with the ban of asbestos in Italy since 1992 are still not giving effects on mesothelioma mortality trends.

Otoacoustic emission sensitivity to exposure to styrene and noise.

The ototoxic effect of the exposure to styrene is evaluated, also in the presence of simultaneous exposure to noise, using otoacoustic emissions as biomarkers of mild cochlear damage. Transient-evoked and distortion product otoacoustic emissions were recorded and analyzed in a sample of workers (15 subjects) exposed to styrene and noise in a fiberglass manufacturing facility and in a control group of 13 non-exposed subjects. Individual exposure monitoring of the airborne styrene concentrations was performed, as well as biological monitoring, based on the urinary concentration of two styrene metabolites, the Mandelic and Phenylglyoxylic acids. Noise exposure was evaluated using wearable phonometers, and hearing loss with pure tone audiometry. Due to their different job tasks, one group of workers was exposed to high noise and low styrene levels, another group to higher styrene levels, close to the limit of 20 ppm, and to low noise levels. A significant negative correlation was found between the otoacoustic emission levels and the concentration of the styrene urinary metabolites. Otoacoustic emissions, and particularly distortion products, were able to discriminate the exposed workers from the controls, providing also a rough estimate of the slope of the dose-response relation between otoacoustic levels and styrene exposure.

[Synergistic exposure to noise and styrene and cochlear functionality in a sample of exposed workers: preliminary results]. / Esposizione sinergica a rumore e stirene e funzionalità cocleare in un campione di lavoratori esposti: risultati preliminari.

This study is aimed at testing the cochlear functionality using otoacoustic emissions, analyzing the synergistic effects of simultaneous exposure to noise and organic solvents EBTx on workers of a glass-reinforced plastic products factory. Exposure to organic solvents was assessed using ambiental measurements and evaluation of the salivary concentration. Biological monitoring was performed evaluating the urinary concentration of the styrene metabolites. Statistical analysis shows that otoacoustic tests can discriminate between different exposure groups. Significant differences were found between controls and subjects exposed to high styrene and low noise levels, showing the ototoxic effect (at sub-clinical level) of the styrene exposure.

[Occupational exposure to hexavalent chromium during aircraft painting]. / Esposizione occupazionale a cromo esavalente nelle operazioni di verniciatura degli aeromobili.

Hygienists are interested in hexavalent chromium due to its genotoxic and carcinogenic effect on humans. The use of products containing hexavalent chromium is decreasing in many industrial fields because of the substitution with less-toxic compounds. In the aeronautical industry, however, the chromate are added to primer paint as a corrosion inhibitor of aircrafts surfaces: so hexavalent chromium compounds are available in many primers with a composition ranging from 10% to 13%. The application of these primers by using electrostatic guns potentially exposes painting and coating workers at high concentrations of aerosols containing Cr(VI). The aim of the present study is the evaluation of professional exposure to hexavalent chromium during aircraft painting, by adopting both environmental personal sampling and biological monitoring. To valuate workers exposure levels the personal measurements results have been compared with the exposure limit values (TLV-TWA) and the urinary chromium contents with the biological exposure indices (IBE). Moreover the strategy of coupling environmental sampling with biological monitoring seems to be a useful instrument to measure the validity of the individual protection devices.

Effects of potential neurotoxic pesticides on hearing loss: a review.

Several pesticides are supposed to be neurotoxic for humans, consequently, they may also affect the auditory system. This review analyzes human and experimental animal studies testing the hypothesis that exposure to pesticides is associated with hearing loss. The literature on this topic is still sparse and methodological limitations of some papers evaluated are identified. As a whole, available data indicate a possible ototoxic action of pesticides, but alternative hypotheses could not be ruled out, also considering some confounders, such as the co-exposure to noise. Therefore, further studies are necessary in order to clarify the association between pesticides exposure and hearing loss. While awaiting more evidence, for precautionary action we recommend considering pesticides as possible ototoxic agents, in particular for vulnerable targets, such as pregnant women and children during early development.