Correspondence
Glutaraldehyde induced asthma in endoscopy nursing staff
The recent article by Vyas et al1 raises some concerns to which I would be grateful if they could respond.
(1) In the abstract one of the objectives is stated as finding the nature and incidence of symptoms experienced by a large sample of hospital endoscopy nurses. The study design is cross sectional and used an adapted version of the MRC questionnaire for respiratory symptoms. This study design normally records disease prevalence rather than incidence.2 It would be helpful to know if the questionnaire sought information on new symptoms in a given period in the past, or the presence of symptoms.
(2) For the purposes of the study, work related symptoms of contact
dermatitis were defined as contact skin rash, which occurred when
working on the endoscopy unit and could not be attributed to known
non-occupational agents. It is not clear what
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