Defining and investigating occupational asthma: a consensus approach.
BACKGROUND
At present there is no internationally agreed definition of occupational asthma and there is a lack of guidance regarding the resources that should be readily available to physicians running specialist occupational asthma services.


OBJECTIVE
To agree a working definition of occupational asthma and to develop a framework of resources necessary to run a specialist occupational asthma clinic.


METHODS
A modified RAND appropriateness method was used to gain a consensus of opinion from an expert panel of clinicians running specialist occupational asthma clinics in the UK.


RESULTS
Consensus was reached over 10 terms defining occupational asthma including: occupational asthma is defined as asthma induced by exposure in the working environment to airborne dusts vapours or fumes, with or without pre-existing asthma; occupational asthma encompasses the terms "sensitiser-induced asthma" and "acute irritant-induced asthma" (reactive airways dysfunction syndrome (RADS)); acute irritant-induced asthma is a type of occupational asthma where there is no latency and no immunological sensitisation and should only be used when a single high exposure has occurred; and the term "work-related asthma" can be used to include occupational asthma, acute irritant-induced asthma (RADS) and aggravation of pre-existing asthma. Disagreement arose on whether low dose irritant-induced asthma existed, but the panel agreed that if it did exist they would include it in the definition of "work-related asthma". The panel agreed on a set of 18 resources which should be available to a specialist occupational asthma service. These included pre-bronchodilator FEV1 and FVC (% predicted); peak flow monitoring (and plotting of results, OASYS II analysis); non-specific provocation challenge in the laboratory and specific IgE to a wide variety of occupational agents.


CONCLUSIONS
It is hoped that the outcome of this process will improve uniformity of definition and investigation of occupational asthma across the UK.
Francis
H C
HC
North West Lung Research Centre, Wythenshawe Hospital, Manchester, UK. Helen.C.Francis@manchester.ac.uk
Prys-Picard
C O
CO
Fishwick
D
D
Stenton
C
C
Burge
P S
PS
Bradshaw
L M
LM
Ayres
J G
JG
Campbell
S M
SM
Niven
R McL
RM
D001249:Asthma / Q000175:diagnosis*; D006801:Humans; D009784:Occupational Diseases / Q000175:diagnosis*; D011364:Professional Practice; D011795:Surveys and Questionnaires