An 18-month-old child is brought to the physician by her distraught parents because of a sore throat, difficulty breathing, and a barking cough for the past day. On physical examination, the toddler is found to have some respiratory stridor and a runny nose but is not in acute distress. The rest of the examination is unremarkable. Which of the following is the most appropriate treatment for this patient?
一名18个月大的孩子因为过去一天的喉咙痛、呼吸困难和犬吠样咳嗽被她心烦意乱的父母带到了医生那里。体格检查发现，幼儿有呼吸性喘鸣和流鼻涕，但无急性痛苦。其余检查无异常。以下哪一项是最适合该患者的治疗？
(A) Amantadine金刚烷胺
(B) Bronchoalveolar lavage支气管肺泡灌洗
(C) Emergency department admittance 急诊科入院
(D) Penicillin青霉素
(E) Supportive therapy支持治疗
答案解析：
最可能的诊断是哮吼，最常见的病因是副流感病毒。哮吼是一种上呼吸道感染，引起狭窄，导致吸气性喘息和犬吠样咳嗽。大多数哮吼病例只需要支持疗法作为治疗。严重病例可能需要辅助供氧、皮质激素和肾上腺素。虽然副流感病毒是引起哮吼的最常见病原体，但也可由流感、呼吸道合胞病毒和麻疹引起。
正确答案：E
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