MullerWening D, Neuhauss M, Protective effect of respiratory devices in farmers with occupational asthma, Eur Respir J, 1998;12:569-572,

BOHRF Original Authors' Main Conclusions

The original authors' main conclusions are taken from Abstract, Results and Discussion. They are decided upon by the authors of the BOHRF occupational asthma guidelines and form part of the guidelines.

Farmers with occupational asthma were challenged with an exposure to work-related dusts for up to 60 min, resulting in significant increases in airway resistance (Raw), thoracic gas volume (TGV) and specific airway resistance (sRaw) compared to baseline values. After mean period of 21 weeks, the farmers were subjected to a second challenge, but this time wearing a protective respiratory device (RD). Significant increases in Raw, TGV and sRaw were again observed, but were on average 50-80% smaller than increases seen when RDs were not worn. This shows that the use of respiratory devices in farmers with occupational asthma significantly reduced the degree of bronchial obstruction, but did not provide complete protection.

BOHRF Associated Evidence Statements

The BOHRF occupational asthma guidelines state that this reference is associated with the following evidence statements

* 3 Air fed helmet respirators may improve or prevent symptoms in some but not all workers who continue to be exposed to the causative agent.

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