Objective:To develop a training content framework for hospice volunteers based on the competency model.Methods:This was a qualitative study. A draft of the training content framwork for hospice volunteers was first formed according to results of literature review and qualitative interviews based on the competency model. From December 2023 to March 2024, two rounds of Delphi consultation with 16 experts were conducted to develop the final version of the system, and the weights of each indicator were determined with analytic hierarchy process.Results:Among the 14 consulting experts who completed two rounds of consultation, including 10 females, all held intermediate or above professional titles, and their working years ranged from 10 to 34 years, covering fields of hospice care, nursing management, clinical nursing and nursing education. In two rounds of consultation the expert positive coefficient was 14/16 and 14/14, the expert authority coefficient was 0.882 and 0.893, and the Kendall coordination coefficient of all indicators was 0.109 and 0.161 ( P<0.01), the coefficient of variation was 0-0.31 and 0-0.19, respectively. The final version of the system consisted of 3 first-level indicators, 7 second-level indicators, 20 third-level indicators, and 55 specific training contents. The three first-level indicators were knowledge, skill, role and value, and the weight coefficients were 0.335, 0.313 and 0.352, respectively. Each judgment matrix was consistent. Conclusions:A training content system for hospice care volunteers has been developed in this study, which may be used for medical institutions and organizations to train hospice care volunteers.

Dry eye disease (DED) is a prevalent and intractable ocular disease induced by a variety of causes. Elevated sphingomyelin (SM) levels and pro-inflammatory cytokines were detected on the ocular surface of DED patients, particularly in the meibomian glands. Sphingomyelin synthase 2 (SMS2), one of the proteins involved in SM synthesis, would light a novel way of developing a DED therapy strategy. Herein, we report the design and optimization of a series of novel thiophene carboxamide derivatives to afford 14l with an improved highly potent inhibitory activity on SM synthesis (IC_{50, SMS2} = 28 nmol/L). Moreover, 14l exhibited a notable protective effect of anti-inflammation and anti-apoptosis on human corneal epithelial cells (HCEC) under TNF-α-hyperosmotic stress conditions in vitro, with an acceptable ocular specific distribution (corneas and meibomian glands) and pharmacokinetics (PK) profiles (t _{1/2, cornea} = 1.11 h; t _{1/2, meibomian glands} = 4.32 h) in rats. Furthermore, 14l alleviated the dry eye symptoms including corneal fluorescein staining scores and tear secretion in a dose-dependent manner in mice. Mechanically, 14l reduced the mRNA expression of Tnf-α, Il-1β and Mmp-9 in corneas, as well as the proportion of very long chain SM in meibomian glands. Our findings provide a new strategy for DED therapy based on selective SMS2 inhibitors.

Objective:To evaluate the effectiveness of anti-G straining maneuver (AGSM) in pilots by surface electromyography (sEMG), and to explore the relationships between characteristics of sEMG and anti-G endurance in pilots.Methods:Thirty-eight male high-performance fighter pilots who completed the human centrifuge test at the Air Force Medical Center were selected. Among them, 25 completed the 8.0 G for 10 s anti-G endurance test and 13 completed the 9.0 G for 10 s anti-G endurance test. The sEMG tester was used to keep track of the changes of sEMG in rectus abdominis, rectus femoris, anterior tibial and gastrocnemius muscles while pilots were engaged in AGSM. The anti-G endurance was evaluated according to the changes of visual fields and consciousness. The pilots were divided into 3 groups: the good vision and consciousness group, peripheral visual field narrowing group and endurance endpoint group. The differences in the integral electromyogram (iEMG), mean power frequency (MPF) and muscle input rates between the 3 groups were investigated.Results:A total of 25 pilots completed the 8.0 G for 10 s anti-G endurance test. Among them, 8 (32.0%) were in the good vision and consciousness group, 13 (52.0%) in the peripheral visual field narrowing group and 4 (16.0%) reached the endurance endpoint. Among the 13 pilots who completed the 9.0 G for 10 s anti-G endurance test, 3 (23.1%) were in the good vision and consciousness group, 6 (46.1%) in the peripheral visual field narrowing group, and 4 (30.8%) in the endurance endpoint group. The results of sEMG showed that the iEMG values of the anterior tibialis muscle in pilots under the 9.0 G for 10 s load were significantly different across endurance groups ( H=7.54, P=0.023), and that the iEMG values of the tibialis anterior muscle in the good vision and consciousness group were higher than those in the endurance endpoint group ( P=0.036). The negative slopes of MPF for the rectus abdominis, rectus femoris, anterior tibialis, and gastrocnemius muscles were higher in the good vision and consciousness group than in the other 2 groups, but the differences were not statistically significant ( P>0.05). During the 8.0 G for 10 s anti-G endurance test, there were significant differences in lower limb muscle contribution rates between the 3 groups ( F=4.19, P=0.029). The endurance endpoint group exhibited a lower contribution rate than the good vision and consciousness group ( P=0.025). During the 9.0 G for 10 s anti-G endurance test, there were significant differences in tibialis anterior muscle contribution rates between the 3 groups ( F=4.16, P=0.049). The endurance endpoint group demonstrated a lower contribution rate than the good vision and consciousness group ( P=0.049). Conclusions:The full and balanced activation of abdominal muscles and lower limb muscles, especially the effective mobilization of calf muscles, plays a pivotal role in improving pilots′ AGSM efficiency in high G environments.

Objective:To develop a training content framework for hospice volunteers based on the competency model.Methods:This was a qualitative study. A draft of the training content framwork for hospice volunteers was first formed according to results of literature review and qualitative interviews based on the competency model. From December 2023 to March 2024, two rounds of Delphi consultation with 16 experts were conducted to develop the final version of the system, and the weights of each indicator were determined with analytic hierarchy process.Results:Among the 14 consulting experts who completed two rounds of consultation, including 10 females, all held intermediate or above professional titles, and their working years ranged from 10 to 34 years, covering fields of hospice care, nursing management, clinical nursing and nursing education. In two rounds of consultation the expert positive coefficient was 14/16 and 14/14, the expert authority coefficient was 0.882 and 0.893, and the Kendall coordination coefficient of all indicators was 0.109 and 0.161 ( P<0.01), the coefficient of variation was 0-0.31 and 0-0.19, respectively. The final version of the system consisted of 3 first-level indicators, 7 second-level indicators, 20 third-level indicators, and 55 specific training contents. The three first-level indicators were knowledge, skill, role and value, and the weight coefficients were 0.335, 0.313 and 0.352, respectively. Each judgment matrix was consistent. Conclusions:A training content system for hospice care volunteers has been developed in this study, which may be used for medical institutions and organizations to train hospice care volunteers.

Objective:To evaluate the effectiveness of anti-G straining maneuver (AGSM) in pilots by surface electromyography (sEMG), and to explore the relationships between characteristics of sEMG and anti-G endurance in pilots.Methods:Thirty-eight male high-performance fighter pilots who completed the human centrifuge test at the Air Force Medical Center were selected. Among them, 25 completed the 8.0 G for 10 s anti-G endurance test and 13 completed the 9.0 G for 10 s anti-G endurance test. The sEMG tester was used to keep track of the changes of sEMG in rectus abdominis, rectus femoris, anterior tibial and gastrocnemius muscles while pilots were engaged in AGSM. The anti-G endurance was evaluated according to the changes of visual fields and consciousness. The pilots were divided into 3 groups: the good vision and consciousness group, peripheral visual field narrowing group and endurance endpoint group. The differences in the integral electromyogram (iEMG), mean power frequency (MPF) and muscle input rates between the 3 groups were investigated.Results:A total of 25 pilots completed the 8.0 G for 10 s anti-G endurance test. Among them, 8 (32.0%) were in the good vision and consciousness group, 13 (52.0%) in the peripheral visual field narrowing group and 4 (16.0%) reached the endurance endpoint. Among the 13 pilots who completed the 9.0 G for 10 s anti-G endurance test, 3 (23.1%) were in the good vision and consciousness group, 6 (46.1%) in the peripheral visual field narrowing group, and 4 (30.8%) in the endurance endpoint group. The results of sEMG showed that the iEMG values of the anterior tibialis muscle in pilots under the 9.0 G for 10 s load were significantly different across endurance groups ( H=7.54, P=0.023), and that the iEMG values of the tibialis anterior muscle in the good vision and consciousness group were higher than those in the endurance endpoint group ( P=0.036). The negative slopes of MPF for the rectus abdominis, rectus femoris, anterior tibialis, and gastrocnemius muscles were higher in the good vision and consciousness group than in the other 2 groups, but the differences were not statistically significant ( P>0.05). During the 8.0 G for 10 s anti-G endurance test, there were significant differences in lower limb muscle contribution rates between the 3 groups ( F=4.19, P=0.029). The endurance endpoint group exhibited a lower contribution rate than the good vision and consciousness group ( P=0.025). During the 9.0 G for 10 s anti-G endurance test, there were significant differences in tibialis anterior muscle contribution rates between the 3 groups ( F=4.16, P=0.049). The endurance endpoint group demonstrated a lower contribution rate than the good vision and consciousness group ( P=0.049). Conclusions:The full and balanced activation of abdominal muscles and lower limb muscles, especially the effective mobilization of calf muscles, plays a pivotal role in improving pilots′ AGSM efficiency in high G environments.

Objective To establish a scientific training program that takes into account both anaerobic and aerobic training for pilots,and to explore the appropriate ratio of aerobic and anaerobic training.Methods According to the physical examination standards for pilots,a total of 16 healthy subjects aged 18-24 were selected from two batches.The two batches of subjects were trained with different aerobic and anaerobic ratios.Training period was 3 months.The changes in cardiopulmonary function of the subjects before and after training were evaluated using the cardiopulmonary function exercise testing system(CPET),and the changes in anaerobic capacity were evaluated using changes in strength as an indicator.Results After training,the weight load of the subjects in the two training programs,including barbell squats,leg flexion and hard pull,and barbell under 10RM and 3RM,was significantly increased(P<0.001),and there was no statistically significant difference in anaerobic strength growth between the two groups.The results of CPET showed that the maximum load,maximum heart rate,and respiratory quotient in the two groups were significantly increased after than before the training(P<0.01).The maximum load(Experiment group 1:29.12±19.69,Experiment group 2:72.00±46.24)and respiratory quotient(Experiment grouop 1:0.11±0.09,Experiment group 2:0.28±0.16)of the subjects in experiment group 2 before and after training were greater than those in experiment group 1.The difference was statistically significant(P<0.05).Conclusion The anaerobic and aerobic capacities of the subjects in the experiment group 2 are effectively improved,indicating that ratio of aerobic and anaerobic of the training scheme is better.

Objective:To construct an evaluation index system for the quality of hospice care services, so as to provide scientific basis for evaluating the clinical practice quality of hospice care in China.Methods:Based on theories related to medical quality, a primary item pool was constructed through literature analysis. From November to December 2023, the Delphi method was used to conduct two rounds of consultation with 18 hospice care experts from 10 provinces and municipalities directly under the central government, to establish the indicators at all levels of the evaluation index system. The weights and combination weights of indicators at all levels were calculated using the analytic hierarchy process. The expert's positive coefficient was expressed as the effective response rate of the questionnaire. The degree of expert authority was expressed as the expert authority coefficient. The degree of coordination of expert opinions was represented by Kendall's W and coefficient of variation. Results:In the two rounds of expert consultation, the effective response rates of the questionnaires were 88.89% (16/18) and 93.75% (15/16), the expert authority coefficients were 0.885 and 0.897, the kendall's W values of the overall indicators were 0.152 and 0.191 ( P<0.01), and the coefficients of variation of indicators at all levels were 0 to 0.31 and 0 to 0.21, respectively. The final constructed evaluation index system for the quality of hospice care services included seven first level indicators, 22 second level indicators, and 42 third level indicators. Conclusions:The evaluation index system for the quality of hospice care services constructed is scientific, comprehensive, and targeted, which can provide reference for the comprehensive evaluation of hospice care service quality in China.

Objective To investigate the effects and mechanisms of median nerve electrical stimulation on synaptic plasticity in ischemic stroke rats.Methods 18 healthy male SD rats were randomly divided into Sham group(n = 6),ischemic stroke group(MCAO group,n = 6)and median nerve electrical stimulation group(MNES group,n = 6).The left middle cerebral artery occlusion model of rats was established by thread plug method.Thread plug was not inserted in sham group.The median nerve electrical stimulation group was given median nerve electrical stimulation intervention on the 3rd day after modeling,and intervention on the next day.After intervention for 7 times,behavioral detection,HE staining was used to detect median nerve injury.Nissl staining was used to detect cerebral infarction volume.Western blot was used for detection of the expression level of proteins related to synaptic plasticity,and electron microscopy was performed.Results HE staining showed that median nerve electrical stimulation did not cause damage to the median nerve in stroke rats,and the median nerve membrane was intact without obvious inflammatory cells.Compared with MCAO group,the neural function,motor function and coordination of the injured forelimb in MNES group were significantly improved(P<0.01).Compared with MCAO group,cerebral infarction volume in MNES group was significantly reduced(P<0.05),the pyknosis of Nissl bodies in ischemic penumbra decreased.Compared with MCAO group,the expression levels of synaptic plastication-related proteins PSD95 and synI in the cortex of MNES group were significantly up-regulated after median nerve electrical stimulation(P<0.05),the number of synapses in the ischemic cortex increased significantly(P<0.01).Conclusion Median nerve electrical stimulation is a safe and effective therapeutic measure to improve nerve function after stroke,and its mechanism is related to promoting synaptic plasticity.

Objective:To provide references for promoting the anti-G ability of flying cadets and improving the training methods by testing the flying cadets′ relaxed +G z tolerance and analyzing the related factors. Methods:Fifty-seven healthy male flying cadets were tested for anti-G ability by cluster sampling. The indicators included relaxed +G z tolerance, maximal pedal force of lower limbs, maximal expiratory pressure (MEP) and maximum inspiratory pressure (MIP). The subjects were divided into high and low tolerance groups, and the low tolerance group was divide into 2 groups by judging if they were with or without visual change. The subjects were divided into high and low limbs strength groups by measured maximal pedal force. The questionnaire was used to get the information of human centrifuge test and the physical training of flying cadets at ordinary time. According to the results of the questionnaires, the subjects were divided into low strength (≤3 times/week) and high strength (>3 times/week) physical training groups by aerobic training intensity. Results:Relaxed +G z tolerance test results of the flying cadets were 3.5 G and 4.0 G, with an average of (3.56±0.17) G. Maximal pedal force of lower limbs was averagely (449.3±105.6) kgf (1 kgf=9.806 N). MEP was averagely (20.1±3.5) kPa. MIP was averagely (10.5±2.3) kPa. MEP of 4.0 G group was higher than that of 3.5 G group, and the difference was significant ( t=2.08, P=0.043). In the subjects of 3.5 G relaxed +G z tolerance, MEP of unchanged vision group was higher than that of changed vision group, and the difference was significant ( t=2.35, P=0.023). Relaxed +G z tolerance of high pedal force group (≥449.3 kgf) was higher than that of low pedal force group (<449.3 kgf), and the difference was significant ( t=2.20, P=0.035). 66.7% of the subjects did not learn correct anti-G maneuver; 91.2% of the subjects took long-distance running; 82.5% of the subjects took strength training; 57.9% of the subjects did lower limbs strength training, but 45.6% of them did not understand the correct methods of training muscle groups. MEP of the high training group was higher than that of low training group, and the difference was significant ( t=3.25, P=0.002). Maximal pedal force of lower limbs in the high training group was lower than that in the low training group, and the difference was significant ( t=2.35, P=0.022). Conclusions:The flying cadets′ anti-G ability is not good in centrifuge. They should be arranged to experience and trained in human centrifuge as early as possible. Anti-G physical training should be enhanced based on anaerobic exercise.

Objective:To provide references for promoting the anti-G ability of flying cadets and improving the training methods by testing the flying cadets′ relaxed +G z tolerance and analyzing the related factors. Methods:Fifty-seven healthy male flying cadets were tested for anti-G ability by cluster sampling. The indicators included relaxed +G z tolerance, maximal pedal force of lower limbs, maximal expiratory pressure (MEP) and maximum inspiratory pressure (MIP). The subjects were divided into high and low tolerance groups, and the low tolerance group was divide into 2 groups by judging if they were with or without visual change. The subjects were divided into high and low limbs strength groups by measured maximal pedal force. The questionnaire was used to get the information of human centrifuge test and the physical training of flying cadets at ordinary time. According to the results of the questionnaires, the subjects were divided into low strength (≤3 times/week) and high strength (>3 times/week) physical training groups by aerobic training intensity. Results:Relaxed +G z tolerance test results of the flying cadets were 3.5 G and 4.0 G, with an average of (3.56±0.17) G. Maximal pedal force of lower limbs was averagely (449.3±105.6) kgf (1 kgf=9.806 N). MEP was averagely (20.1±3.5) kPa. MIP was averagely (10.5±2.3) kPa. MEP of 4.0 G group was higher than that of 3.5 G group, and the difference was significant ( t=2.08, P=0.043). In the subjects of 3.5 G relaxed +G z tolerance, MEP of unchanged vision group was higher than that of changed vision group, and the difference was significant ( t=2.35, P=0.023). Relaxed +G z tolerance of high pedal force group (≥449.3 kgf) was higher than that of low pedal force group (<449.3 kgf), and the difference was significant ( t=2.20, P=0.035). 66.7% of the subjects did not learn correct anti-G maneuver; 91.2% of the subjects took long-distance running; 82.5% of the subjects took strength training; 57.9% of the subjects did lower limbs strength training, but 45.6% of them did not understand the correct methods of training muscle groups. MEP of the high training group was higher than that of low training group, and the difference was significant ( t=3.25, P=0.002). Maximal pedal force of lower limbs in the high training group was lower than that in the low training group, and the difference was significant ( t=2.35, P=0.022). Conclusions:The flying cadets′ anti-G ability is not good in centrifuge. They should be arranged to experience and trained in human centrifuge as early as possible. Anti-G physical training should be enhanced based on anaerobic exercise.