对部分慢性支气管炎急性发作期及迁延期的病人进行病例对照研究；
The case control studies on parts of patients in acute attack and delayed peroids of chronic bronchitis were carried out.
事实上，由约翰霍普金斯大学医学院的教授们进行的这项研究显示，每年因医疗事故死亡的病人远远高于因患气肿或支气管炎等呼吸道疾病死亡的人数。
In fact, the study, from doctors at Johns Hopkins, suggests medical errors may kill more people than lower respiratory diseases like emphysema and bronchitis do.
如果火山灰在底层空气中高浓度聚集，那些患有哮喘、肺气肿或者支气管炎等慢性呼吸道疾病人更容易受刺激。
People with chronic respiratory conditions like asthma, emphysema or bronchitis may be more susceptible to irritation if ash is in the lower atmosphere in high concentrations.
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