Objective To evaluate the diagnostic value of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) in the diagnosis of mediastinal lymphadenopathy.Methods EBUS-TBNA were performed in 148 mediastinal lymphadenopathy previously by CT were selected,and 129 malignant tumor were confirmed by surgery.The advantages of EBUS-TBNA were evaluated,including superiority,success rate of puncture and diagnostic accurary.Results In 129 cases,mediastinal lymphadenopathy were detected clearly and were guided accurately by EBUS-TBNA.The positive results were obtained in 118 cases,and the false negative results in 11 cases.The success rate of biopsy and sensitivity of diagnosis by EBUS-TBNA in malignant tumor were 100％ and 91.47％ respectively.There were no complications in this group.Conclusions EBUS-TBNA is a safe and useful technique in diagnosis of mediastinal lymphadenopathy and evaluate the response to neoadjuvant chemotherapy.

The macroscopy and ultrasondgraphy analysis for thirty reseeted specimens of esophageal carcinoma proved by pathology was reported in this paper.The ultrasonic features of esophageal carcinoma as follows:the local wails became thicker,their layers were unclear or disap-peared,the normal walls were insteaded of irregular masses with hypoechoic patterns, the borders of the masses were definite or indefinite,and the posterior echoes of the masses had little change.In addi-tion,the depth of tumor invasion Was compared by the ultrasonography and pathology.The ultrasonic features of the esophageal walls without tumor were also described.

Objective:To explore the motivation of the formation of the breastfeeding mission and education behavior of nurses in NICU, analyze the deep reasons, and construct the motivation and path theoretical model of the formation of the breastfeeding mission and education behavior of nurses in NICU.Methods:Through semi-structured interviews, the qualitative research method of grounded theory was used to study 20 nurses in the Second Affiliated Hospital, University of South China from July to September 2020, to construct the motivation and path theoretical model of the formation of the breastfeeding mission and education behavior of nurses in NICU.Results:The research identified five main categories: attitude factor, ability factor, behavior factor, internalization and externalization. Under the influence of three dimensions of attitude level, ability level and behavior level and their cross-layer interaction effects, the NICU nurses were driven to form stable breastfeeding mission and education behaviors through internalization and externalization.Conclusions:Based on the evolutionary context of "multi-dimensional factors and their interaction drivers-internalization-externalization", the relationship between attitude factors, ability factors, behavioral factors, internalization, and externalization are clarified. It provides a theoretical reference basis for managers in managing the breastfeeding propaganda and education of nurses in the NICU, and enriches the theoretical framework of breastfeeding behavior in the NICU.