<b>Background:</b> Displacement of endotracheal tube (ETT) can result in endobronchial intubation and accidental extubation that severely threatens safety of surgical patients. However, few surveys have in...<b>Background:</b> Displacement of endotracheal tube (ETT) can result in endobronchial intubation and accidental extubation that severely threatens safety of surgical patients. However, few surveys have investigated intraoperative ETT displacement experienced by anesthesiologists. The objective of these surveys was to investigate ETT fixation method and ETT displacement during general anesthesia experienced by anesthesiologists in China in 2014 and 2020. <b>Methods:</b> A questionnaire was designed with twenty questions and randomly distributed to anesthesiologists in two survey methods. In 2014, we collected responses from anesthesiologists who participated in the 22nd annual meeting of the Chinese Society of Anesthesiology in a face-to-face setting;in 2020, anesthesiologists from twenty-eight provinces completed the questionnaire through an online questionnaire survey platform. Differences in the responses from the anesthesiologists in 2014 and 2020 were assessed with a chi-square test. <b>Results:</b> In total, 568 questionnaires were collected, of which 541 questionnaires were valid (valid response rate 95.2%). A majority of the respondents (65.6%) had experienced ETT displacement, and 4.3% of respondents had experienced serious complications due to ETT displacement. Three hundred and twenty-nine respondents (60.8%) fixed the ETT with adhesive tape in the shape of the letter X. A majority of respondents considered the influence of surgical site, body position (97.8% of all respondents), and age (77.1% of all respondents) on fixing the ETT. Adhesive tape was the most commonly used material to fix the ETT (90.4% of the respondents). <b>Conclusion:</b> During clinical anesthesia, a majority of anesthesiologists experienced ETT displacement that can result in serious consequences. Therefore, the management of ETT should be a priority during the operation.展开更多
A model of random porous media degradation via several fluid displacing,freezing and thawing cycles is investigated.The fluid transport is based on the deterministic method with dispersion effect.The research shows th...A model of random porous media degradation via several fluid displacing,freezing and thawing cycles is investigated.The fluid transport is based on the deterministic method with dispersion effect.The research shows that the topology and the geometry of the porous media have a strong effect on displacement processes.The distribution of throat size N(r)after displacement but before freezing damage shows that the major change,after successive cycles,happens at throat radius r>0.9.The distribution of velocities normal to the interface of viscous fingering in percolation cluster is also studied.When iterations n≥10,the scaling function distribution is very sharp.展开更多
In this paper,the phenomenon on collapsible tube displacement oscillation,a new behavior of the collapsible tube puisatile flow has been studied.The experiments show that the collapsible tube,in which the flow is peri...In this paper,the phenomenon on collapsible tube displacement oscillation,a new behavior of the collapsible tube puisatile flow has been studied.The experiments show that the collapsible tube,in which the flow is periodic puisatile in the upstream,will oscillate as a simple supported beam when it is collapsed to certain extent,and that if the tube is collapsed continue,this oscillation will tend to weak and completely disappear lastly.An analytical model corresponding to the collapsible tube displacement oscillation and its governed equations are set up from the experiment background.By analysing the model and solving the equations, the collapsible tube displacement oscillation pattern and the oscillation occurring or disappearing criterion are obtained.The results predicted by this study are in agreement with those observed from experiment phenomena.展开更多
BACKGROUND The common treatment for hydrocephalus is insertion of a ventriculoperitoneal shunt.Shunt tube displacement is one of the common complications.Most shunt tube displacements occur in children and has a repor...BACKGROUND The common treatment for hydrocephalus is insertion of a ventriculoperitoneal shunt.Shunt tube displacement is one of the common complications.Most shunt tube displacements occur in children and has a reportedly lower incidence in adults.CASE SUMMARY This study reports an adult patient(male,56 years)who suffered from intracranial aneurysm and subarachnoid hemorrhage and underwent aneurysm clipping following hospitalization.One month post onset of the disease,the patient underwent ventriculoperitoneal shunt due to hydrocephalus.The peritoneal end of the shunt tube was displaced in the peritoneal cavity 9 years after the aneurysm clipping.The peritoneal end of the shunt tube was removed and ventriculoperitoneal shunt was re-performed after anti-inflammatory treatment.CONCLUSION Shunt tube displacement has a low incidence in adults.In order to avoid shunt tube displacement,there is a need to summarize its causative factors and practice personalized medicine.展开更多
Nosing process of circular metal tubes in empty and polyurethane foam-filled conditions on a semispherical rigid die was analyzed by theoretical and experimental methods.A new theoretical model of plastic deformation ...Nosing process of circular metal tubes in empty and polyurethane foam-filled conditions on a semispherical rigid die was analyzed by theoretical and experimental methods.A new theoretical model of plastic deformation of circular metal tubes was demonstrated during the nosing process on a rigid semispherical die.Based on the analytical model,some theoretical relations were calculated to estimate instantaneous forming load and dissipated energy of empty and foam-filled circular metal tubes versus axial displacement.Some circular brazen and aluminum tubes were prepared and shaped into semispherical nosed nozzles to verify the present theory.Comparison of theoretical predictions and the corresponding experimental measurements reveals that predicted load?displacement and dissipated energy?displacement diagrams by theoretical formulas have a good correlation with the corresponding experimental curves and it proves verity of the theory.Also,the present theory shows that dissipated energy and axial load of empty tubes depend on material type,wall thickness and diameter of the tubes and they are independent of tube initial length.Furthermore,the experimental results show that the presence of polyethylene Teflon-constraints increases ultimate axial displacement of the forming process.展开更多
文摘<b>Background:</b> Displacement of endotracheal tube (ETT) can result in endobronchial intubation and accidental extubation that severely threatens safety of surgical patients. However, few surveys have investigated intraoperative ETT displacement experienced by anesthesiologists. The objective of these surveys was to investigate ETT fixation method and ETT displacement during general anesthesia experienced by anesthesiologists in China in 2014 and 2020. <b>Methods:</b> A questionnaire was designed with twenty questions and randomly distributed to anesthesiologists in two survey methods. In 2014, we collected responses from anesthesiologists who participated in the 22nd annual meeting of the Chinese Society of Anesthesiology in a face-to-face setting;in 2020, anesthesiologists from twenty-eight provinces completed the questionnaire through an online questionnaire survey platform. Differences in the responses from the anesthesiologists in 2014 and 2020 were assessed with a chi-square test. <b>Results:</b> In total, 568 questionnaires were collected, of which 541 questionnaires were valid (valid response rate 95.2%). A majority of the respondents (65.6%) had experienced ETT displacement, and 4.3% of respondents had experienced serious complications due to ETT displacement. Three hundred and twenty-nine respondents (60.8%) fixed the ETT with adhesive tape in the shape of the letter X. A majority of respondents considered the influence of surgical site, body position (97.8% of all respondents), and age (77.1% of all respondents) on fixing the ETT. Adhesive tape was the most commonly used material to fix the ETT (90.4% of the respondents). <b>Conclusion:</b> During clinical anesthesia, a majority of anesthesiologists experienced ETT displacement that can result in serious consequences. Therefore, the management of ETT should be a priority during the operation.
基金Supported by the National Natural Science Foundation of China under Grant No.19774023by the National High Performance Computing Foundation of China(No.984050).
文摘A model of random porous media degradation via several fluid displacing,freezing and thawing cycles is investigated.The fluid transport is based on the deterministic method with dispersion effect.The research shows that the topology and the geometry of the porous media have a strong effect on displacement processes.The distribution of throat size N(r)after displacement but before freezing damage shows that the major change,after successive cycles,happens at throat radius r>0.9.The distribution of velocities normal to the interface of viscous fingering in percolation cluster is also studied.When iterations n≥10,the scaling function distribution is very sharp.
文摘In this paper,the phenomenon on collapsible tube displacement oscillation,a new behavior of the collapsible tube puisatile flow has been studied.The experiments show that the collapsible tube,in which the flow is periodic puisatile in the upstream,will oscillate as a simple supported beam when it is collapsed to certain extent,and that if the tube is collapsed continue,this oscillation will tend to weak and completely disappear lastly.An analytical model corresponding to the collapsible tube displacement oscillation and its governed equations are set up from the experiment background.By analysing the model and solving the equations, the collapsible tube displacement oscillation pattern and the oscillation occurring or disappearing criterion are obtained.The results predicted by this study are in agreement with those observed from experiment phenomena.
基金National Natural Science Foundation of China,No.81773161 and No.81572472.
文摘BACKGROUND The common treatment for hydrocephalus is insertion of a ventriculoperitoneal shunt.Shunt tube displacement is one of the common complications.Most shunt tube displacements occur in children and has a reportedly lower incidence in adults.CASE SUMMARY This study reports an adult patient(male,56 years)who suffered from intracranial aneurysm and subarachnoid hemorrhage and underwent aneurysm clipping following hospitalization.One month post onset of the disease,the patient underwent ventriculoperitoneal shunt due to hydrocephalus.The peritoneal end of the shunt tube was displaced in the peritoneal cavity 9 years after the aneurysm clipping.The peritoneal end of the shunt tube was removed and ventriculoperitoneal shunt was re-performed after anti-inflammatory treatment.CONCLUSION Shunt tube displacement has a low incidence in adults.In order to avoid shunt tube displacement,there is a need to summarize its causative factors and practice personalized medicine.
文摘Nosing process of circular metal tubes in empty and polyurethane foam-filled conditions on a semispherical rigid die was analyzed by theoretical and experimental methods.A new theoretical model of plastic deformation of circular metal tubes was demonstrated during the nosing process on a rigid semispherical die.Based on the analytical model,some theoretical relations were calculated to estimate instantaneous forming load and dissipated energy of empty and foam-filled circular metal tubes versus axial displacement.Some circular brazen and aluminum tubes were prepared and shaped into semispherical nosed nozzles to verify the present theory.Comparison of theoretical predictions and the corresponding experimental measurements reveals that predicted load?displacement and dissipated energy?displacement diagrams by theoretical formulas have a good correlation with the corresponding experimental curves and it proves verity of the theory.Also,the present theory shows that dissipated energy and axial load of empty tubes depend on material type,wall thickness and diameter of the tubes and they are independent of tube initial length.Furthermore,the experimental results show that the presence of polyethylene Teflon-constraints increases ultimate axial displacement of the forming process.
