应用氟嗪酸口服治疗４２例住院的慢性支气管炎和肺心病患者的下呼吸道感染，每次２００ｍｇ，每日３次。结果：总有效率８８１％；致病菌被清除率８４６％，其中革兰阴性杆菌的清除率为８４４％；不良反应发生率１１９％，未影响治疗，表明其可作为慢性支气管炎和肺心病患者下呼吸道院内感染的首选药物。 Oral use ofloxacin 42 cases of hospitalized patients with chronic bronchitis and pulmonary heart disease lower respiratory tract infection, each 200mg, 3 times a day. Results: The total effective rate was 881%, the pathogenic bacteria clearance rate was 846%, of which the gramnegative bacilli clearance rate was 844% and the adverse reaction rate was 119%, which did not affect the treatment, As chronic bronchitis and pulmonary heart disease in patients with lower respiratory tract nosocomial infection of choice.