Several subclassifications have been proposed : simple chronic bronchitis describes a condition characterized by mucoid sputum production ; chronic mucopurulent bronchitis is characterized by persistent or recurrent purulence of sputum in the absence of localized suppurative diseases such as bronchiectasis ; chronic bronchitis with obstruction deserves a separate classification characterized by presence of airway obstruction as assessed by the used of the forced expiratory vital capacity maneuver ; and chronic asthmatic bronchitis 它可以分为以下几种类型：单纯性慢性支气管炎，其特征为咳粘液性痰；慢性粘液脓性支气管炎，其特征是反复的或持续的咳脓痰，但肺部并无化脓性病变，如支气管扩张；慢性支气管炎伴阻塞，其特征为用力呼气肺活量测定时有气道阻塞的表现；慢性哮喘性支气管炎，其特征是患者有长期的咳嗽及咯痰史，后来肺部出现哮鸣者，因此与哮喘伴慢性气管阻塞的病人不同。
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" the sputum bacteriology results and the antibiotic resistance pattern could provide some guidance for the choice of empirical antibiotic treatment for copd patients admitted to the hospital with clinical evidence of airway infection , such as fever and increased sputum volume and purulence , " the investigators conclude 调查者总结到， “痰中细菌的结果和抗生素耐药型可以对copd病人经验性抗生素治疗的选择提供一些指导原则，这些住院病人都有呼吸道感染的证据，例如高烧和痰量增加和脓痰。 ”
