To compare the chemical components of supercritical extracts from Herba Ephedrae and honey-prepared Herba Ephedrae. Volatile oils were extracted from Herba Ephedrae and honey-prepared Herba Ephedrae by supercritical CO 2 extraction and then identified by the combination of gas chromatography and mass spectrometry (GC-MS). Twenty kinds of components such as diethylsulfate obtained from Herba Ephedrae were not found in honey-prepared Herba Ephedrae and twelve different components such as hydroxymethylfurfural were obtained from honey-prepared Herba Ephedrae. The extraction rate of volatile oils was 2.1% in herba ephedrae and 1.0% in honey-prepared Herba Ephedrae. [ Conclusion]The components of supercritical extractions from Herba Ephedrae differ from those in honey-prepared Herba Ephedrae.

Objective To understand the frequency distribution of causes to facilitate the diagnosis and treatment of chronic cough.Methods Patients were recruited according to the inclusion criteria:chronic cough more than 8 weeks;normal X-ray appearance;coughing symptoms as the main or only symptom.Disease history was referred and physical examination was conducted,according to the diagnosis criteria of chronic cough causeoriented processes.If laboratory examination results are missing for a patient,empirical treatment will be combined as a treatment for this patient.Finally,the curative effect and the cause of disease will be analyzed.Results Seventy-nine patients were followed up.Twenty-eight,12,22,10,and 7 patients respectively were suspected of having CVA,EB,UACS,AC and GERC,among whom,23,9,14,9 and 4 were confirmed for their diagnosis,and 84.1％,75.0％,63.6％,90.0％,and 57.1％ of them received effective targeted therapies,accounting for 29.1％,11.4％,24.1％,11.4％,and 6.3％ respectively of all patients.The overall response rate was 74.7％.Conclusion The diagnosis and treatment of chronic cough with combinational cause-oriented diagnostic process and empirical therapy produce high effective rate with low cost.In addition,it could help understand the local frequency distribution of causes of chronic cough.It may be worth wide clinical application.