The role of allergic rhinitis in nasal responses to sudden temperature changes.
BACKGROUND
Air conditioning-induced rhinitis in allergic individuals is a common epidemiologic finding, but its physiopathology is still controversial. The aim of this study was to describe and compare the effects of experimental air conditioning temperature changes on the nasal mucosa of individuals with persistent allergic rhinitis compared with a control group.


METHODS
A case-control challenge study was performed in a laboratory of thermal comfort with experimental twin challenge chambers set at a 12 degrees C difference in temperature. A group of 32 patients with persistent allergic rhinitis and a group of 16 control subjects were exposed for 30 minutes, 3 times alternately in each chamber. Nasal symptom scores were recorded and nasal samples collected before, immediately after, and 24 and 48 hours after the challenge.


RESULTS
The rhinitis group showed a higher symptom score, epithelial shedding, percentage of eosinophils, total inflammatory cells, leukotriene C(4), eosinophil cationic protein, albumin, and tryptase levels compared with controls. There was also a significant increase in symptom score, total cells recovered, percentage of eosinophils, epithelial shedding, albumin, myeloperoxidase, and soluble intercellular adhesion molecule 1 in both groups compared with baseline levels.


CONCLUSIONS
Sudden temperature changes led to a more pronounced inflammatory nasal response in the rhinitis group with the recruitment and activation of eosinophils.


CONCLUSIONS
Persistent allergic rhinitis is a risk factor for developing sudden temperature change-related rhinitis even in the absence of allergen exposure.
Graudenz
Gustavo Silveira
GS
Division of Immunology and Clinical Allergy, Internal Medicine Department, Polytechnical Institute, State University of São Paulo, Brazil. gustavog@usp.br <gustavog@usp.br>
Landgraf
Richardt G
RG
Jancar
Sonia
S
Tribess
Arlindo
A
Fonseca
Simone G
SG
Faé
Kellen Cristhina
KC
Kalil
Jorge
J
D000328:Adult; D003080:Cold Temperature; D005260:Female; D006358:Hot Temperature; D006801:Humans; D007073:Immunoglobulin E / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009297:Nasal Mucosa / Q000276:immunology* / Q000473:pathology*; D012221:Rhinitis, Allergic, Perennial / Q000276:immunology* / Q000473:pathology*; D006255:Rhinitis, Allergic, Seasonal / Q000276:immunology* / Q000473:pathology*
D007073:Immunoglobulin E