目的探讨无创双水平双向压力触发(Biphasic tr)在早产儿呼吸窘迫综合征的应用及效果。方法回顾性分析汕头市潮阳区大峰医院NICU收治的58例新生儿呼吸窘迫综合征(respiratory distress syndrome of newborn,RDSN)临床资料,将双水平压力...目的探讨无创双水平双向压力触发(Biphasic tr)在早产儿呼吸窘迫综合征的应用及效果。方法回顾性分析汕头市潮阳区大峰医院NICU收治的58例新生儿呼吸窘迫综合征(respiratory distress syndrome of newborn,RDSN)临床资料,将双水平压力触发通气治疗作为观察组,将经鼻持续气道正压通气(NCPAP)通气治疗作为对照组,比较两组RDSN患儿气管插管-肺表面活性物质-拔管(intubation-surfactant-extubation,In Sur E)治疗失败率、机械通气治疗比例、机械通气时间、无创通气时间、常规氧疗时间及并发症情况。结果两组患儿的In Sur E治疗失败率比较差异无统计学意义(P>0.05);In Sur E治疗失败后观察组机械通气治疗比例显著低于对照组,差异有统计学意义(P<0.05);观察组患儿的无创通气时间显著高于对照组,差异有统计学意义(P<0.05);观察组患儿的机械通气时间及常规氧疗时间显著低于对照组,差异有统计学意义(P<0.05);观察组患儿的早产儿视网膜病变及支气管发育不良率显著低于对照组,差异有统计学意义(P<0.05)。结论 Biphasic tr与NCPAP在RDSN患儿的应用可降低机械通气的使用,缩短机械通气时间,降低RDSN患儿视网膜病变及支气管发育不良的风险,值得临床应用。展开更多
An airway pressure and flow data acquisition system is developed to investigate the approach to building the bi-level positive airway pressure BiPAP in a ventilator.A number of experiments under different breathing si...An airway pressure and flow data acquisition system is developed to investigate the approach to building the bi-level positive airway pressure BiPAP in a ventilator.A number of experiments under different breathing situations and states are conducted and the experimental data are recorded.According to the data from these experiments the variation characteristics of the pressure and flow are analyzed using Matlab. The data analysis results show that the pressure increases while the flow decreases in the expiratory phase contrarily the pressure decreases while the flow increases in the inspiratory phase during the apnea state both the pressure and the flow remain unchanged. According to the above variation characteristics of breath a feedback-based method for creating bi-level positive airway pressure is proposed. Experiments are implemented to verify the BiPAP model. Results demonstrate that the proposed method works effectively in following respiration and caters well to most polypnea and apnea events.展开更多
The relationship between the maximum shear stress in a substrate solid and the elastic wave reflection coefficient from the interface between the substrate solid and an overlying solid half-space is investigated. Both...The relationship between the maximum shear stress in a substrate solid and the elastic wave reflection coefficient from the interface between the substrate solid and an overlying solid half-space is investigated. Both substrate and overlying solid media are assumed to be initially isotropic and stress-free. Then as the substrate is subjected to horizontal confined stresses it becomes anisotropic. It is shown that longitudinal and shear wave reflection coefficients are related to the degree of stress induced anisotropy in the substrate medium. From this relation the confined stress level and the maximum shear stress generated on the vertical planes of the substrate are estimated. Authors in their previous investigation computed plane wave reflection coefficient in a biaxially compressed solid substrate immersed in a fluid. This paper reports for the first time how the maximum shear stress in a biaxially compressed substrate medium can be measured from the plane wave reflection coefficients when the overlying medium is also a solid half-space.展开更多
文摘目的探讨无创双水平双向压力触发(Biphasic tr)在早产儿呼吸窘迫综合征的应用及效果。方法回顾性分析汕头市潮阳区大峰医院NICU收治的58例新生儿呼吸窘迫综合征(respiratory distress syndrome of newborn,RDSN)临床资料,将双水平压力触发通气治疗作为观察组,将经鼻持续气道正压通气(NCPAP)通气治疗作为对照组,比较两组RDSN患儿气管插管-肺表面活性物质-拔管(intubation-surfactant-extubation,In Sur E)治疗失败率、机械通气治疗比例、机械通气时间、无创通气时间、常规氧疗时间及并发症情况。结果两组患儿的In Sur E治疗失败率比较差异无统计学意义(P>0.05);In Sur E治疗失败后观察组机械通气治疗比例显著低于对照组,差异有统计学意义(P<0.05);观察组患儿的无创通气时间显著高于对照组,差异有统计学意义(P<0.05);观察组患儿的机械通气时间及常规氧疗时间显著低于对照组,差异有统计学意义(P<0.05);观察组患儿的早产儿视网膜病变及支气管发育不良率显著低于对照组,差异有统计学意义(P<0.05)。结论 Biphasic tr与NCPAP在RDSN患儿的应用可降低机械通气的使用,缩短机械通气时间,降低RDSN患儿视网膜病变及支气管发育不良的风险,值得临床应用。
基金The National Natural Science Foundation of China(No.51275090)the Science and Technology Support Program of Jiangsu Province(No.BE2011608)the Program for Special Talent in Six Fields of Jiangsu Province(No.2008144)
文摘An airway pressure and flow data acquisition system is developed to investigate the approach to building the bi-level positive airway pressure BiPAP in a ventilator.A number of experiments under different breathing situations and states are conducted and the experimental data are recorded.According to the data from these experiments the variation characteristics of the pressure and flow are analyzed using Matlab. The data analysis results show that the pressure increases while the flow decreases in the expiratory phase contrarily the pressure decreases while the flow increases in the inspiratory phase during the apnea state both the pressure and the flow remain unchanged. According to the above variation characteristics of breath a feedback-based method for creating bi-level positive airway pressure is proposed. Experiments are implemented to verify the BiPAP model. Results demonstrate that the proposed method works effectively in following respiration and caters well to most polypnea and apnea events.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41474098, 11134011)by State Key Laboratory of Acoustics (Grant No. SKLA201608)
文摘The relationship between the maximum shear stress in a substrate solid and the elastic wave reflection coefficient from the interface between the substrate solid and an overlying solid half-space is investigated. Both substrate and overlying solid media are assumed to be initially isotropic and stress-free. Then as the substrate is subjected to horizontal confined stresses it becomes anisotropic. It is shown that longitudinal and shear wave reflection coefficients are related to the degree of stress induced anisotropy in the substrate medium. From this relation the confined stress level and the maximum shear stress generated on the vertical planes of the substrate are estimated. Authors in their previous investigation computed plane wave reflection coefficient in a biaxially compressed solid substrate immersed in a fluid. This paper reports for the first time how the maximum shear stress in a biaxially compressed substrate medium can be measured from the plane wave reflection coefficients when the overlying medium is also a solid half-space.
