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Three Cases of Adult Croup

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  • 成人クループの3例
  • 臨床 成人クループの3例
  • リンショウ セイジン クループ ノ 3レイ

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Croup is an acute respiratory tract inflammation characterized by swelling of the subglottic tissue caused by an infection with respiratory viruses such as parainfluenza virus, influenza virus, adenovirus and respiratory syncytial virus. Its symptoms include fever, barking cough, stridor and hoarseness. It is a relatively common condition in childhood, especially at younger than three years of age. Since it rarely occurs in adulthood, the clinical features of adult croup are mostly unknown. We report herein on three cases of adult croup and review another 17 cases of adult croup described in the literatures written in English or Japanese. The clinical features of adult croup were compared to that of croup in children. The patients with adult croup present with symptoms such as sore throat and dysphagia in addition to the symptoms that are common for croup in children. A coronal neck X-ray revealed a characteristic narrowing of the subglottic trachea, the steeple sign, in all cases. Although flexible laryngoscopy also has a high diagnostic value, it is necessary to pay careful attention to the clinical findings of possible airway obstruction. Two of our three cases and eight of 17 reported cases required airway management, indicating a much more severe condition in adults compared to that in children. Another clinical characteristics of adult cases include that only very severe cases have been diagnosed as croup. A rise of antigen titer against parainfluenza virus type 3 was detected in one case, while influenza virus antigen was detected in the other two cases.


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