Nasal blown secretion evaluation in specific occupational nasal challenges.
OBJECTIVE
To investigate the usefulness of nasal blown secretion evaluation during specific nasal provocation test (sNPT) in diagnosing occupational rhinitis (OR).


METHODS
To validate the method, nasal blown secretions from 103 healthy subjects and 30 allergic rhinitis patients were analyzed. Furthermore, we analyzed nasal blown secretions, collected before and after sNPT, of 29 subjects with work-related rhinitis symptoms (WRRS) who underwent the diagnostic pathway for OR. Rhinoscopy and nasal symptom score were used to define a positive sNPT.


RESULTS
A total of 89.6% WRRS subjects provided suitable nasal secretions. Eosinophils significantly increased after positive sNPTs compared to negative ones (P = 0.006). Four percent and/or 1 x 10(4) eosinophils/ml was the cut-off for a significant post-sNPT eosinophil increase. A total of 4/13 (33%) WRRS subjects with negative sNPT, assessed by rhinoscopy and nasal symptom score, presented a significant post-sNPT nasal eosinophil increase, and were identified as possible OR.


CONCLUSIONS
Eosinophil evaluation in nasal blown secretions is an important tool in monitoring the response to occupational specific nasal challenges.
Pignatti
Patrizia
P
Scientific Institute of Pavia, Italy. patrizia.pignatti@fsm.it
Pala
Gianni
G
Pisati
Marta
M
Perfetti
Luca
L
Banchieri
Gabriella
G
Moscato
Gianna
G
D000293:Adolescent; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D004802:Eosinophilia / Q000175:diagnosis*; D004804:Eosinophils; D006801:Humans; D007159:Immunologic Tests / Q000379:methods*; D007958:Leukocyte Count; D008875:Middle Aged; D009093:Mucus / Q000276:immunology*; D009297:Nasal Mucosa / Q000276:immunology*; D009784:Occupational Diseases / Q000175:diagnosis*; D012016:Reference Values; D012221:Rhinitis, Allergic, Perennial / Q000175:diagnosis*; D055815:Young Adult
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