...敏原暴露的时间可分为季节性过敏性鼻炎（seasonal allergic rhinitis，SAR）和常年性过敏性鼻炎（perennial allergic rhinitis， PAR）。
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按照中华医学会耳鼻咽喉科学分会、中华耳鼻咽喉科杂志编缉委员会1997年海口会议提出的过敏性鼻炎诊断标准，选择季节性和常年性过敏性鼻炎患者为研究对象。
Using the diagnoses standard advanced by Chinese Otolaryngology Research Team and the committee of Chinese Otolaryngology Journal Editors in Haikou Meeting in 1997, ar suffers were selected randomly.
目的：评价左西替利嗪治疗常年性过敏性鼻炎的有效性和安全性。
AIM: To evaluate the efficacy and safety of levocetirizine and cetirizine in the treatment of perennial allergic rhinitis.
用于瘙痒和季节性鼻炎，常年性过敏性鼻炎引起的荨麻疹。
Pruritus and urticaria caused by seasonal rhinitis, perennial allergic rhinitis.
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