Search

Objective: To discuss the predictive value of lung ultrasound score (LUS) for the use of mechanical ventilation (MV) and pulmonary surfactant (PS) in the preterm infants with late-onset respiratory distress syndrome (RDS). Methods: The prospective analysis was conducted on the late-onset preterm infants (gestational age 340/7-366/7 weeks) complicated with RDS; in total, 67 late-onset infants complicated with RDS were included. The infants were divided into MV group (n=36), non-MV group (n=31), PS group (n=30), and non-PS group (n=37) based on the necessity to use MV and PS within 48 h after birth. Lung ultrasound examination was performed on all the infants 2 h after admission, and before the application of PS, and the LUS for 6-zone, 10-zone, and 12-zone partitions were calculated. Receiver operating characteristic (ROC) curve for the prediction of MV and PS application in the infants with late-onset RDS were drawn by LUS with different partitions, and the predictive values of different partition methods were compared by DeLong method. Results: Compared with non-PS group, the birth weight, LUS, positive end expiratory pressure (PEEP), mean airway pressure (MAP), MAP×fraction of inspired oxygen (FiO2 )/PaO2 value, duration of mechanical ventilation, and hospital stay of the infants in PS group were increased (P<0. 05), and the ratio of PaO2/FiO2 was decreased (P<0. 01). Compared with non-MV group, the birth weight, LUS, PEEP, MAP, MAP × FiO2/PaO2 value, duration of mechanical ventilation and hospital stay of the infants in MV group were increased (P<0. 05), and the ratio of PaO2/FiO2 was decreased (P<0. 01). PEEP, MAP, and LUS were identified as the influencing factors for application of PS in the late-onset preterm infants complicated with RDS when employing 6-zone LUS to predict the application of PS [odds ratio (OR)>1, P<0. 05]. When employing 10-zone and 12-zone LUS for the use of PS, MAP × FiO2/PaO2 and LUS were the influencing factors (OR>1, P<0. 05). The area under curve (AUC) for predicting the application of PS in the late-onset infants complicated with RDS by 6-zone, 10-zone, and 12-zone LUS were 0. 909, 0. 904, and 0. 915, respectively, all showing good predictive values; the AUCs for predicting the application of MV by 6-zone, 10-zone, and 12-zone LUS were 0. 868, 0. 872, and 0. 887, respectively, all showing good predictive values as well. Conclusion: LUS can effectively predict the necessity for whether or not applying MV and PS in the lateonset infants complicated with RDS, and MAP combined with LUS can enhance the capability to predict the application of MV. [ABSTRACT FROM AUTHOR]

In order to realize long-term stable production, the boosting and deep cooling efficiency project is implemented in a condensate gas field and the development efficiency of the gas field by raising the recovery rate of ethane and liquefied gas in natural gas is improved comprehensively. All equipment and functions of the original shallow cooling unit in the treatment station are kept in place without any change. The original automatic control system and auxiliary production system are also kept unchanged. The existing production separator, moisture desolidated impurity installation and condensate oil stabilization device for the old use will be used in the new deep cooling unit and at the same time, a new molecular sieve dehydration unit is used to meet the minimum temperature of-106 ℃ of deep condensate unit, and RSV process is adopted for light hydrocarbon recovery process. The recovery rate of ethane reaches 95%, which improves the economic benefits of natural gas treatment plant, and an effective measure for the improvement of efficiency in the middle and later stage of condensate gas field is obtained. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Contemporary Pediatrics is the property of Xiangya Medical Periodical Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)