AIM:To investigate the effects of memantine(Mem),an N-methyl-D-aspartate(NMDA)recep-tor antagonist,on sevoflurane(Sev)anesthetic depth and perioperative neurocognitive disorders in mice,and to explore the possible mechanisms involved.METHODS:Mouse electroencephalogram(EEG)monitoring and cognitive disorder models were established.For EEG monitoring,male C57BL/6J mice were randomly divided into control group,Sev group,and Mem+Sev group.The EEG monitoring electrodes were implanted in the heads of the mice 7 d before anesthe-sia.On the day of anesthesia,the mice in Mem+Sev group received an intraperitoneal injection of 20 mg/kg Mem dissolved in normal saline,while those in control and Sev groups received intraperitoneal injection of an equivalent volume of normal saline based on body weight.Thirty minutes later,the mice in Sev and Mem+Sev groups were anesthetized with 400 mL/min O2+3%Sev for 5 h,while those in control group were treated with 400 mL/min O2 for 5 h.The EEG monitoring was ter-minated after the righting reflex was restored in Sev and Mem+Sev groups.The time of disappearance and recovery of the righting reflex was recorded,and changes in EEG burst suppression ratio and relative power of each frequency band were analyzed.For the cognitive disorder part,another batch of male C57BL/6J mice were selected and divided into the same groups as before.The mice underwent water maze spatial navigation training for 6 d before anesthesia.On the day of anes-thesia,the mice in Mem+Sev group received an intraperitoneal injection of 20 mg/kg Mem dissolved in normal saline,while those in control and Sev groups received intraperitoneal injection of an equivalent volume of normal saline based on body weight.Thirty minutes later,the mice in Sev and Mem+Sev groups were anesthetized with 400 mL/min O2+3%Sev for 5 h,and those in control group were treated with 400 mL/min O2 for 5 h.Spatial navigation and exploration tests were conducted 3 d after anesthesia.After the tests,the mice were sacrificed,and their hippocampal tissues were collected.The levels of interleukin-1β(IL-1β),tumor necrosis factor-α(TNF-α)and acetylcholine(ACh)in the hippocampal tis-sues were detected by ELISA.The concentration of Ca2+in the hippocampal tissues was measured using a calcium assay kit.Pathological changes in the hippocampal CA3 region were observed by HE staining,and the protein levels of NMDA receptor GluN1 subunit,GABAA receptor,amyloid β-protein(Aβ),and p-tau were detected by Western blot.RE-SULTS:Compared with control group,the mice in Sev group had increased burst suppression ratio at all time points dur-ing anesthesia and prolonged escape latency and reduced platform crossings 3 d after anesthesia(P<0.05).The levels of IL-1β and TNF-α in the hippocampal tissues increased,while the level of ACh decreased,and the concentration of Ca2+in-creased.The protein levels of GluN1 subunit,Aβ and p-tau were elevated(P<0.05).Compared with Sev group,the mice in Mem+Sev group had shortened anesthesia induction time and increased burst suppression ratio at all time points during anesthesia,with elevated relative power of slow waves and δ waves(P<0.05).The escape latency was shortened,and the platform crossings increased 3 d after anesthesia(P<0.05).The levels of IL-1β and TNF-α in the hippocampal tissues decreased,while the levels of ACh increased,and the protein levels of GluN1 subunit,Aβ and p-tau were reduced(P<0.05).There was no significant difference in anesthesia recovery time among the groups(P>0.05).CONCLU-SION:Memantine,in combination with Sev anesthesia,accelerates anesthesia induction and deepens anesthetic depth,which may be related to the increased relative power of δ EEG waves,but has no significant effect on recovery time.Me-mantine intervention alleviates Sev anesthesia-induced cognitive disorders by inhibiting the overexpression of NMDA recep-tors,Aβ and p-tau,and attenuating neuroinflammation.

AIM:To investigate the effects of memantine(Mem),an N-methyl-D-aspartate(NMDA)recep-tor antagonist,on sevoflurane(Sev)anesthetic depth and perioperative neurocognitive disorders in mice,and to explore the possible mechanisms involved.METHODS:Mouse electroencephalogram(EEG)monitoring and cognitive disorder models were established.For EEG monitoring,male C57BL/6J mice were randomly divided into control group,Sev group,and Mem+Sev group.The EEG monitoring electrodes were implanted in the heads of the mice 7 d before anesthe-sia.On the day of anesthesia,the mice in Mem+Sev group received an intraperitoneal injection of 20 mg/kg Mem dissolved in normal saline,while those in control and Sev groups received intraperitoneal injection of an equivalent volume of normal saline based on body weight.Thirty minutes later,the mice in Sev and Mem+Sev groups were anesthetized with 400 mL/min O2+3%Sev for 5 h,while those in control group were treated with 400 mL/min O2 for 5 h.The EEG monitoring was ter-minated after the righting reflex was restored in Sev and Mem+Sev groups.The time of disappearance and recovery of the righting reflex was recorded,and changes in EEG burst suppression ratio and relative power of each frequency band were analyzed.For the cognitive disorder part,another batch of male C57BL/6J mice were selected and divided into the same groups as before.The mice underwent water maze spatial navigation training for 6 d before anesthesia.On the day of anes-thesia,the mice in Mem+Sev group received an intraperitoneal injection of 20 mg/kg Mem dissolved in normal saline,while those in control and Sev groups received intraperitoneal injection of an equivalent volume of normal saline based on body weight.Thirty minutes later,the mice in Sev and Mem+Sev groups were anesthetized with 400 mL/min O2+3%Sev for 5 h,and those in control group were treated with 400 mL/min O2 for 5 h.Spatial navigation and exploration tests were conducted 3 d after anesthesia.After the tests,the mice were sacrificed,and their hippocampal tissues were collected.The levels of interleukin-1β(IL-1β),tumor necrosis factor-α(TNF-α)and acetylcholine(ACh)in the hippocampal tis-sues were detected by ELISA.The concentration of Ca2+in the hippocampal tissues was measured using a calcium assay kit.Pathological changes in the hippocampal CA3 region were observed by HE staining,and the protein levels of NMDA receptor GluN1 subunit,GABAA receptor,amyloid β-protein(Aβ),and p-tau were detected by Western blot.RE-SULTS:Compared with control group,the mice in Sev group had increased burst suppression ratio at all time points dur-ing anesthesia and prolonged escape latency and reduced platform crossings 3 d after anesthesia(P<0.05).The levels of IL-1β and TNF-α in the hippocampal tissues increased,while the level of ACh decreased,and the concentration of Ca2+in-creased.The protein levels of GluN1 subunit,Aβ and p-tau were elevated(P<0.05).Compared with Sev group,the mice in Mem+Sev group had shortened anesthesia induction time and increased burst suppression ratio at all time points during anesthesia,with elevated relative power of slow waves and δ waves(P<0.05).The escape latency was shortened,and the platform crossings increased 3 d after anesthesia(P<0.05).The levels of IL-1β and TNF-α in the hippocampal tissues decreased,while the levels of ACh increased,and the protein levels of GluN1 subunit,Aβ and p-tau were reduced(P<0.05).There was no significant difference in anesthesia recovery time among the groups(P>0.05).CONCLU-SION:Memantine,in combination with Sev anesthesia,accelerates anesthesia induction and deepens anesthetic depth,which may be related to the increased relative power of δ EEG waves,but has no significant effect on recovery time.Me-mantine intervention alleviates Sev anesthesia-induced cognitive disorders by inhibiting the overexpression of NMDA recep-tors,Aβ and p-tau,and attenuating neuroinflammation.

Enhanced recovery after surgery has reduced the number and duration of medical catheter placements through perioperative optimization measures. However, in clinical practice, catheters are still inevitably heavily used, and the risk of catheter-related infections persists. Preventing bacterial adhesion and biofilm formation on catheter surfaces is crucial. Medical antibacterial-coated catheters introduce substances that prevent fouling and adhesion, inhibit or kill bacteria on the surface, forming an antibacterial functional surface, providing a new strategy to address catheter-related infections. This article summarizes the current research status of medical antibacterial-coated catheters, introduces the antibacterial strategies and principles of the coatings, describes their actual effects in clinical applications, and analyzes future research directions. These studies help reduce catheter-related infections, promote innovation in clinical nursing technology, and improve the quality and efficiency of nursing care.

Enhanced recovery after surgery has reduced the number and duration of medical catheter placements through perioperative optimization measures. However, in clinical practice, catheters are still inevitably heavily used, and the risk of catheter-related infections persists. Preventing bacterial adhesion and biofilm formation on catheter surfaces is crucial. Medical antibacterial-coated catheters introduce substances that prevent fouling and adhesion, inhibit or kill bacteria on the surface, forming an antibacterial functional surface, providing a new strategy to address catheter-related infections. This article summarizes the current research status of medical antibacterial-coated catheters, introduces the antibacterial strategies and principles of the coatings, describes their actual effects in clinical applications, and analyzes future research directions. These studies help reduce catheter-related infections, promote innovation in clinical nursing technology, and improve the quality and efficiency of nursing care.

Fibroblast growth factor receptors (FGFRs) have emerged as promising targets for anticancer therapy. In this study, we synthesized and evaluated the biological activity of 66 pyrazolo[3,4-

Objective To deduce analytic solution of the displacement and stress distributions for the coronary stent based on reasonable assumptions, and to investigate the influence from the wave number of support bars on stress distributions by combining the results of finite element analysis. Methods A local cylindrical coordinate system was established to deduce analytical solution of the displacement and stress components of the periodic support bar of the rectangular-wave type vascular stent under vascular systolic pressure. The support bar model was established by using ANSYS, to calculate the numerical results of stress analysis. By analyzing the consistency of stress curves obtained from the two methods, the accuracy and applicability of analytical solutions were verified. The influence from the number of wave crests for support bars on the stress under systolic pressure was investigated by analytic solution. Results The analytical stress curves were basically in conformity with those from the ANSYS results. When the number of wave crests was 6, there were both tensile and compressive stresses in circumferential direction of the cross bar. Conclusions When the number of wave crests was 6, such stents could effectively prevent restenosis in blood vessels during working. The derived analytical solution could be used to analyze mechanical properties of one-cycle support bars of rectangular-wave type stent, and the research findings provided a new idea to further recognize and study the stress distributions on coronary stent to reduce the restenosis rate of interventional therapy.

Objective:To demonstrate the post-discharge catch-up growth of extremely premature infants (EPI) within 24 months of corrected age.Methods:This study retrospectively collected the anthropomorphic measurements of 311 EPI who visited Shenzhen Maternity and Child Healthcare Hospital from August 2013 to April 2020. These infants were stratified according to gestational age at birth (GA): 23-24 +6weeks, 25-26 +6weeks, 27-27 +6weeks; and birth weight:<750 g, 750-999 g, ≥1 000 g. The anthropomorphic measurements, including weight, length, and head circumference for age, were recorded timely from discharge to 24 months of corrected age. And the growth curve stratified by GA and birth weight were fitted in both chronological age and corrected age, which were then compared with the World Health Organization Child Growth Standards for term infant (2006 version), to investigate the catch-up growth pattern of EPI. And appropriate catch-up was defined as the measurements reached the 25 th percentile of WHO growth curve. Results:In these 311 EPI, 184 were males and 127 females, with gestational age of 23-27 +6 weeks and birth weight of 480-1 430 g. Regardless of the GA and birth weight, the growth curves fitted in corrected age failed to overlap with that in chronological age by 24 months of corrected age. The growth velocity of weight, length and head circumference in both corrected and chronological age were all positively correlated with GA and birth weight: the 27-27 +6weeks group showed a preferable growth pattern than the 25-26 +6weeks group, and the curve of the 23-24 +6weeks group was most unfavorable; and the same pattern was observed between the subgroups of different birth weight. Furthermore, the GA had more significant impact on the catch-up growth pattern than birth weight did. When assessed with corrected age curve, the weight and length of both male and female EPIs achieved appropriate catch-up by 24 months, as well as the head circumference of girls; whereas, boys′ head circumference reached appropriate catch-up at the corrected age of 9 months, but fell behind the 25 th percentile after that. However, when assessed with chronological age curve, both boys and girls failed to achieve appropriate catch-up in weight, length and head circumference by age 24 months. And no matter in corrected or chronological age, all physical measurements of girls were lower than those of boys. Conclusions:The rapid catch-up growth of EPI happens within 6 months of corrected age. The lower the birth weight and gestational age, the lower the physical measurements at each corresponding month of age, and the longer it takes to achieve appropriate catch-up. Gestational age has a greater impact on the longitudinal catch-up growth than birth weight does. And girls generally grow slower than boys in either correct or actual age. Before 24 months of corrected age, the growth should be assessed with corrected age rather than chronological age.

Objective:To explore the occurrence and clinical characteristics of hypersensitivity reactions induced by antimicrobial drugs in neonates.Methods:The reports of hypersensitivity reactions induced by antimicrobial drugs in Neonatology Department of Chengdu Women′s and Children′s Central Hospital from January 1, 2015 to December 31, 2017 were collected. According to the basic information of children provided by the reports, the electronic medical records of the children were collected from the hospital information system and the data of application, occurrence, treatments, and outcomes of hypersensitivity reactions were recorded. The clinical manifestations, types, and severity of hypersensitivity reactions were evaluated by 3 pharmacists according to relevant standards. From the hospital information system, the total number of outpatients and inpatients in Department of Neonatology in the same period was counted, the usage of antimicrobial drugs was recorded, and the incidence of hypersensitivity reactions due to antimicrobial agents was caculated.Results:A total of 73 reports of hypersensitivity reactions to antimicrobial drugs in Department of Neonatology were entered, involving 73 newborn infants; there were 21 146 infants using anti-microbial agents at the same time, so the incidence of antimicrobial hypersensitivity reactions was 0.35%. Among the 73 children, 34 were male and 39 were female; the ages on visit or admission to the hospital was (14±7) days; 69 (94.52%) were given injections of antimicrobial agents and 4 (5.48%) were given oral preparations. A total of 20 antimicrobial agents of 7 categories were used; the top 3 were cephalosporins (32 infants, 43.84%), penicillins (21 infants, 28.77%), and cephamycins (6 infants s, 8.22%). The top 3 drugs with higher incidence of hypersensitivity reactions were levofloxacin hydrochloride injection (2/4), erythromycin lactobionate for injection [1.29% (4/311)], and vancomycin hydrochloride for injection [1.07% (4/374)]. Among the 73 infants, 4 (5.48%) had immediate hypersensitivity reactions, of which 3 were severe (including 1 with anaphylactic shock, 1 with dyspnea, and 1 with severe anaphylactic reaction) cases; 69 (94.52%) had nonimmediate hypersensitivity reactions, mainly manifested as rash, digestive system symptoms, and fever, of which 6 were severe cases (including 3 infants with hepatobiliary system injury, 2 with neutropenia, and 1 with severe drug eruption). After discontinuation of suspected drugs and/or antiallergic and symptomatic treatments, 71 of 73 newborns recovered (97.26%) and 2 (2.74%) improved.Conclusions:The incidence of hypersensitivity reactions induced by antimicrobial drugs in newborns in Chengdu Women′s and Children′s Central Hospital was 0.35%. The clinical types of hypersensitivity reactions induced by antimicrobial drugs in neonates were mainly nonimmediate types, most of them were general hypersensitivity reactions, but the immediate drug hypersensitivity reactions were mostly severe hypersensitivity reactions.

Objective:To explore the occurrence and clinical characteristics of hypersensitivity reactions induced by antimicrobial drugs in neonates.Methods:The reports of hypersensitivity reactions induced by antimicrobial drugs in Neonatology Department of Chengdu Women′s and Children′s Central Hospital from January 1, 2015 to December 31, 2017 were collected. According to the basic information of children provided by the reports, the electronic medical records of the children were collected from the hospital information system and the data of application, occurrence, treatments, and outcomes of hypersensitivity reactions were recorded. The clinical manifestations, types, and severity of hypersensitivity reactions were evaluated by 3 pharmacists according to relevant standards. From the hospital information system, the total number of outpatients and inpatients in Department of Neonatology in the same period was counted, the usage of antimicrobial drugs was recorded, and the incidence of hypersensitivity reactions due to antimicrobial agents was caculated.Results:A total of 73 reports of hypersensitivity reactions to antimicrobial drugs in Department of Neonatology were entered, involving 73 newborn infants; there were 21 146 infants using anti-microbial agents at the same time, so the incidence of antimicrobial hypersensitivity reactions was 0.35%. Among the 73 children, 34 were male and 39 were female; the ages on visit or admission to the hospital was (14±7) days; 69 (94.52%) were given injections of antimicrobial agents and 4 (5.48%) were given oral preparations. A total of 20 antimicrobial agents of 7 categories were used; the top 3 were cephalosporins (32 infants, 43.84%), penicillins (21 infants, 28.77%), and cephamycins (6 infants s, 8.22%). The top 3 drugs with higher incidence of hypersensitivity reactions were levofloxacin hydrochloride injection (2/4), erythromycin lactobionate for injection [1.29% (4/311)], and vancomycin hydrochloride for injection [1.07% (4/374)]. Among the 73 infants, 4 (5.48%) had immediate hypersensitivity reactions, of which 3 were severe (including 1 with anaphylactic shock, 1 with dyspnea, and 1 with severe anaphylactic reaction) cases; 69 (94.52%) had nonimmediate hypersensitivity reactions, mainly manifested as rash, digestive system symptoms, and fever, of which 6 were severe cases (including 3 infants with hepatobiliary system injury, 2 with neutropenia, and 1 with severe drug eruption). After discontinuation of suspected drugs and/or antiallergic and symptomatic treatments, 71 of 73 newborns recovered (97.26%) and 2 (2.74%) improved.Conclusions:The incidence of hypersensitivity reactions induced by antimicrobial drugs in newborns in Chengdu Women′s and Children′s Central Hospital was 0.35%. The clinical types of hypersensitivity reactions induced by antimicrobial drugs in neonates were mainly nonimmediate types, most of them were general hypersensitivity reactions, but the immediate drug hypersensitivity reactions were mostly severe hypersensitivity reactions.

Objective To investigate maternal zinc metabolism and the changes of zinc-related factors as metallothionein-1 (MT1) and zinc transporter-1 (ZnT1) in certain types of congenital heart diseases (CHD).Methods Fifteen infants with interventricular septal defect,12 infants with atrial septal defect and 7 infants with tetralogy of Fallot,together with their mothers were enrolled,and normal infants and their mothers were enrolled by a ratio of 1 ∶ 1 with the above three types of CHD diseases.General conditions of the mothers,along with their diets and zinc-containing drug supplementation during the pregnancy,were surveyed.Maternal blood zinc levels and serum alkaline phosphatase activities at gestation week 32 and delivery or induced abortion,and the protein and mRNA expressions of MT1 and ZnT1 in maternal serum and placental tissue at delivery or induced abortion were assayed.Results The general conditions were comparable between the CHD group and control group.The ratio of the mothers taking more zinc-rich food was significantly lower in the CHD group than in the control group.Circulating zinc levels in interventricular septal defect (73.55±5.79 μmol/L),atrial septal defect (72.66±5.82 μmol/L) and tetralogy of Fallot (68.72±6.72 μmol/L) groups were significantly lower than those in the control groups (82.77± 7.88,84.58 ± 7.55 and 85.66 ± 7.30 μmol/L) at delivery (P all ＜ 0.05).Similar change patterns were seen for serum alkaline phosphatase activities.The relative quantities of serum MT1 and ZnT1 proteins in interventricular septal defect (73.22±36.54 and 68.55± 27.82),atrial septal defect (64.29± 38.26 and 74.55 ± 29.67) and tetralogy of Fallot (67.88± 30.50 and 70.13±29.65) groups were significantly lower than those in their corresponding control groups (166.31±67.43and 97.67±30.22,182.56±71.40 and 111.65±32.70,and 173.81±62.36 and 108.27±28.52,P＜0.01 or P＜0.05).The relative quantities of placental MT1 and ZnT1 proteins and mRNA expressions in interventricular septal defect (protein quantities 0.438±0.096 and 0.384±0.061,mRNA expressions 1.23±0.82 and 0.96±0.39),atrial septal defect (0.427±0.093 and 0.377±0.059,1.17±0.70 and 0.85±0.40) and tetralogy of Fallot (0.414±0.111 and 0.336±0.066,1.31±0.97 and 0.90±0.38) groups were significantly lower than those in their corresponding control groups (protein quantities 0.565±0.083 and 0.541±0.090,mRNA expressions 2.78± 1.06 and 1.67±0.33;protein quantities 0.622±0.136 and 0.493±0.079,mRNA expressions 2.85±0.89 and 1.72±0.38;protein quantities 0.637±0.125 and 0.521±0.089,mRNA expressions 3.21 ± 0.99 and 1.61±0.29;P＜0.01 or P＜0.05).Conclusion Mothers with their fetus of certain types of CHD are found zinc deficiency,and down-regulation of MT1 and ZnT1 expressions in the serum and placenta may involve in the pathogenesis of CHD when maternal zinc deficiency.