BACKGROUND Macrodactyly is a rare congenital malformation characterized by an increase in the size of all structures of a digit,accounting for less than 1%of all congenital upper extremity conditions.CASE SUMMARY We r...BACKGROUND Macrodactyly is a rare congenital malformation characterized by an increase in the size of all structures of a digit,accounting for less than 1%of all congenital upper extremity conditions.CASE SUMMARY We report a case involving a 49-year-old woman who presented for the first time with untreated,radial-sided hand macrodactyly.We performed soft tissue debulking,amputation,median nerve neurotomy and coaptation,and carpal tunnel release.At the 6-year follow-up,no significant growth was observed in the bone or soft tissue of the affected area.CONCLUSION Tissue overgrowth in patients with progressive macrodactyly can continue and progress excessively with age.Median nerve neurotomy and coaptation play a crucial role in preventing recurrence of the deformity.展开更多
Objective:Some pregnancy complications are associated with respiratory problems in infants.Early identification and implementation of respiratory support are needed for these infants.This study aimed to(1)use lung ult...Objective:Some pregnancy complications are associated with respiratory problems in infants.Early identification and implementation of respiratory support are needed for these infants.This study aimed to(1)use lung ultrasound(LU)for predicting the respiratory support requirements of infants and(2)simplify the examination method to facilitate its clinical application.Methods:Neonates underwent LU examinations within 1 hour of birth.The infants were divided into a pregnancy complication(PC)group and a control group according to their mothers'clinical data.The primary outcome measure was the need for respiratory support.Predictive models were established based on the differences in LU patterns between the two groups.The predictive value of the models was compared with that of the LU score(LUS)system,which has been widely used in other studies.Simplified models were established by analyzing the predictive effects of LU patterns in different parts of the lungs.Predictive reliability was tested using the receiver operating characteristic curve analysis.Results:PC and control groups had 29 and 117 neonates,respectively;a total of 22 neonates required respiratory support.The PC and control groups showed differences in respiratory support requirements,A-lines,and coalesced B-lines.The percentages of A-lines and coalesced B-lines were associated with respiratory support requirements.The optimal cutoff values for the percentages of the A-lines and coalesced B-lines were 55.7%and 24.5%,respectively.Similar effects were obtained by calculating the percentage of coalesced B-lines in four areas(R3,R4,L3,and L4).These methods were judged as more visual and convenient than LUS assessment.conclusion:The percentages of A-line and coalesced B-lines on LU images can be used to predict the respiratory support needs of neonates whose mothers had pregnancy complications.Only four areas(R3,R4,L3,and L4)had similar predictive values.展开更多
A V-shaped bending device was established to evaluate the effects of temperature and bending fillet radius on springback behavior of 2219-W aluminum alloy at cryogenic temperatures.The cryogenic springback mechanism w...A V-shaped bending device was established to evaluate the effects of temperature and bending fillet radius on springback behavior of 2219-W aluminum alloy at cryogenic temperatures.The cryogenic springback mechanism was elucidated through mechanical analyses and numerical simulations.The results indicated that the springback angle at cryogenic temperatures was greater than that at room temperature.The springback angle increased further as the temperature returned to ambient conditions,attributed to the combined effects of the “dual enhancement effect” and thermal expansion.Notably,a critical fillet radius made the springback angle zero for 90° V-shaped bending.The critical fillet radius at cryogenic temperatures was smaller than that at room temperature,owing to the influence of temperature variations on the bending moment ratio between the forward bending section at the fillet and the reverse bending section of the straight arm.展开更多
基金Supported by Special TCM Innovation Project of Hebei Provincial Department of Science and Technology,No.223777130DScientific Research Project of Hebei Province Administration of Traditional Chinese Medicine,No.2024215.
文摘BACKGROUND Macrodactyly is a rare congenital malformation characterized by an increase in the size of all structures of a digit,accounting for less than 1%of all congenital upper extremity conditions.CASE SUMMARY We report a case involving a 49-year-old woman who presented for the first time with untreated,radial-sided hand macrodactyly.We performed soft tissue debulking,amputation,median nerve neurotomy and coaptation,and carpal tunnel release.At the 6-year follow-up,no significant growth was observed in the bone or soft tissue of the affected area.CONCLUSION Tissue overgrowth in patients with progressive macrodactyly can continue and progress excessively with age.Median nerve neurotomy and coaptation play a crucial role in preventing recurrence of the deformity.
基金supported by the Shanghai Municipal Health Commission(202040402)。
文摘Objective:Some pregnancy complications are associated with respiratory problems in infants.Early identification and implementation of respiratory support are needed for these infants.This study aimed to(1)use lung ultrasound(LU)for predicting the respiratory support requirements of infants and(2)simplify the examination method to facilitate its clinical application.Methods:Neonates underwent LU examinations within 1 hour of birth.The infants were divided into a pregnancy complication(PC)group and a control group according to their mothers'clinical data.The primary outcome measure was the need for respiratory support.Predictive models were established based on the differences in LU patterns between the two groups.The predictive value of the models was compared with that of the LU score(LUS)system,which has been widely used in other studies.Simplified models were established by analyzing the predictive effects of LU patterns in different parts of the lungs.Predictive reliability was tested using the receiver operating characteristic curve analysis.Results:PC and control groups had 29 and 117 neonates,respectively;a total of 22 neonates required respiratory support.The PC and control groups showed differences in respiratory support requirements,A-lines,and coalesced B-lines.The percentages of A-lines and coalesced B-lines were associated with respiratory support requirements.The optimal cutoff values for the percentages of the A-lines and coalesced B-lines were 55.7%and 24.5%,respectively.Similar effects were obtained by calculating the percentage of coalesced B-lines in four areas(R3,R4,L3,and L4).These methods were judged as more visual and convenient than LUS assessment.conclusion:The percentages of A-line and coalesced B-lines on LU images can be used to predict the respiratory support needs of neonates whose mothers had pregnancy complications.Only four areas(R3,R4,L3,and L4)had similar predictive values.
基金the financial supports from the National Key Research and Development Program of China (No. 2019YFA0708804)。
文摘A V-shaped bending device was established to evaluate the effects of temperature and bending fillet radius on springback behavior of 2219-W aluminum alloy at cryogenic temperatures.The cryogenic springback mechanism was elucidated through mechanical analyses and numerical simulations.The results indicated that the springback angle at cryogenic temperatures was greater than that at room temperature.The springback angle increased further as the temperature returned to ambient conditions,attributed to the combined effects of the “dual enhancement effect” and thermal expansion.Notably,a critical fillet radius made the springback angle zero for 90° V-shaped bending.The critical fillet radius at cryogenic temperatures was smaller than that at room temperature,owing to the influence of temperature variations on the bending moment ratio between the forward bending section at the fillet and the reverse bending section of the straight arm.
