Organ fibrosis is a chronic tissue injury caused by multiple causes,and the continuous dynamic progression will lead to abnormal organ structure and function.Recent studies have shown that Chinese materia medica can inhibit organ fibrosis by regulating the PI3K/Akt pathway,which holds potential significance for developing anti-fibrosis strategies.This article systematically reviewed the role of the PI3K/Akt signaling pathway in the entire process of fibrosis,and summarized the potential mechanisms of Chinese materia medica monomers,drug pairs and compounds that can target and intervene in PI3K/Akt signaling transduction in preventing and treating organ fibrosis,in order to provide reference for the intervention of Chinese materia medica in the PI3K/Akt pathway for the treatment of organ fibrosis.

Objective:To explore the differences in the ability of different parts of the human skin to recognize vibration frequencies in order to provide data for physiological optimization of vibration parameters in pilots′ tactile vests.Methods:Ten healthy volunteers were selected and grouped by age as 20-40 years (6 cases) and 41-50 years (4 cases). All the subjects participated in 3 trials: ① identification test of frequency steps using cutaneous tactile perception: the back of the left hand was chosen as the test area, a dual-oscillator synchronous vibration system was adopted, and the frequency step was gradually increased (initially 0.1 Hz) to determine the threshold of frequency identification; ② maximum frequency threshold test of cutaneous tactile perception: the maximum frequency recognition thresholds in 7 parts of the trunk (the left waist, right waist, chest, back, left shoulder, right shoulder, neck) and the back of the hand were tested; ③ frequency discrimination test of cutaneous tactile perception: 5 equally spaced frequencies (covering the frequency recognition thresholds) were set to evaluate the accuracy of tactile frequency memory on the back of the hand after 3, 15 min and 24 h. The relationships between the adjacent step sizes of cutaneous tactile perception and the average value of the sum of adjacent frequencies were analyzed using simple linear regression. The highest identification thresholds of frequencies in different parts of the subjects as well as the accuracy of frequency discrimination during different periods were compared across the age groups.Results:The maximum thresholds of frequency identification of cutaneous tactile perception among the 10 subjects ranged from 16.20 to 33.55 Hz, while the range of adjacent step sizes was between 3.60 and 7.10 Hz. The adjacent step sizes were positively correlated with the average value of the sum of adjacent frequencies ( r=0.882, F=529.18, P<0.001). In the test on the maximum threshold of frequency identification of cutaneous tactile perception, there was a statistically significant difference in the main effect of an age group between the 2 groups ( F=15.87, P<0.001), but not in the main effect of the site ( P>0.05), or in the interactions between the group and age ( P>0.05). The accuracies of skin vibration frequency memory on the dorsal hand of the subjects at 3, 15 min and 24 h were 88%, 72% and 68% respectively. In the frequency discrimination test, there were no statistically significant differences in the main effect of the group, main effect of time or in their interactions between the 2 groups (all P>0.05). Conclusions:The ability of the human skin to identify vibration frequency is impacted by age, but there is no difference in sensitivity between the trunk and the back of the hand. It is recommended that the tactile vest for pilots be designed for general purposes to make it easy to adapt to vibration frequencies of multiple parts.

Organ fibrosis is a chronic tissue injury caused by multiple causes,and the continuous dynamic progression will lead to abnormal organ structure and function.Recent studies have shown that Chinese materia medica can inhibit organ fibrosis by regulating the PI3K/Akt pathway,which holds potential significance for developing anti-fibrosis strategies.This article systematically reviewed the role of the PI3K/Akt signaling pathway in the entire process of fibrosis,and summarized the potential mechanisms of Chinese materia medica monomers,drug pairs and compounds that can target and intervene in PI3K/Akt signaling transduction in preventing and treating organ fibrosis,in order to provide reference for the intervention of Chinese materia medica in the PI3K/Akt pathway for the treatment of organ fibrosis.

Objective:To explore the differences in the ability of different parts of the human skin to recognize vibration frequencies in order to provide data for physiological optimization of vibration parameters in pilots′ tactile vests.Methods:Ten healthy volunteers were selected and grouped by age as 20-40 years (6 cases) and 41-50 years (4 cases). All the subjects participated in 3 trials: ① identification test of frequency steps using cutaneous tactile perception: the back of the left hand was chosen as the test area, a dual-oscillator synchronous vibration system was adopted, and the frequency step was gradually increased (initially 0.1 Hz) to determine the threshold of frequency identification; ② maximum frequency threshold test of cutaneous tactile perception: the maximum frequency recognition thresholds in 7 parts of the trunk (the left waist, right waist, chest, back, left shoulder, right shoulder, neck) and the back of the hand were tested; ③ frequency discrimination test of cutaneous tactile perception: 5 equally spaced frequencies (covering the frequency recognition thresholds) were set to evaluate the accuracy of tactile frequency memory on the back of the hand after 3, 15 min and 24 h. The relationships between the adjacent step sizes of cutaneous tactile perception and the average value of the sum of adjacent frequencies were analyzed using simple linear regression. The highest identification thresholds of frequencies in different parts of the subjects as well as the accuracy of frequency discrimination during different periods were compared across the age groups.Results:The maximum thresholds of frequency identification of cutaneous tactile perception among the 10 subjects ranged from 16.20 to 33.55 Hz, while the range of adjacent step sizes was between 3.60 and 7.10 Hz. The adjacent step sizes were positively correlated with the average value of the sum of adjacent frequencies ( r=0.882, F=529.18, P<0.001). In the test on the maximum threshold of frequency identification of cutaneous tactile perception, there was a statistically significant difference in the main effect of an age group between the 2 groups ( F=15.87, P<0.001), but not in the main effect of the site ( P>0.05), or in the interactions between the group and age ( P>0.05). The accuracies of skin vibration frequency memory on the dorsal hand of the subjects at 3, 15 min and 24 h were 88%, 72% and 68% respectively. In the frequency discrimination test, there were no statistically significant differences in the main effect of the group, main effect of time or in their interactions between the 2 groups (all P>0.05). Conclusions:The ability of the human skin to identify vibration frequency is impacted by age, but there is no difference in sensitivity between the trunk and the back of the hand. It is recommended that the tactile vest for pilots be designed for general purposes to make it easy to adapt to vibration frequencies of multiple parts.

Objective:To investigate the pollution levels and influencing factors of polybrominated diphenyl ethers (PBDEs) in household dust in five cities in northern China.Methods:Based on the "Chinese Indoor Environment and Health Surveillance" project carried out by the National Institute of Environmental Health, Chinese Center for Disease Control and Prevention in 2018-2019, during the warm season (April 2018 to September 2018) and the cold season (November 2018 to March 2019), Lanzhou in Northwest China, Shijiazhuang in North China, Panjin in Northeast China, Luoyang in Central China, and Qingdao in East China were selected as the research sites. A total of 87 families were recruited to study residences in real-life scenarios. At the same time, dust samples were collected to detect the concentration of PBDEs. The level of household environmental indicators was measured, and the residential building characteristics and family behavior habits were collected through questionnaires. A total of 142 valid dust samples and 140 valid questionnaires were obtained. The differences in PBDE concentrations across seasons, wind zones, residential building characteristics, and family habits were analyzed. The exploratory factor analysis was performed to investigate the possible sources of PBDEs, and multivariate linear regression was used to explore the factors influencing PBDEs in household dust.Results:The M ( Q1,Q3) of total PBDE concentrations in 142 household dust samples in five cities was 144.51 (106.61, 222.65) ng/g in the warm season and 145.10 (98.57, 180.65) ng/g in the cold season, respectively. There were seasonal differences in the concentration of ∑ 12PBDEs in Luoyang and Shijiazhuang ( P<0.01). The concentration of BDE-71 was highest among PBDE homologues, followed by BDE-66 and BDE-47. Three factors were extracted by exploratory factor analysis in the warm season, and the cumulative variance contribution rate was 67.90%. The multivariate linear regression showed that the house completion less than ten years [ β (95% CI): 0.186 (0.013, 0.359)], infrequent home cooking [ β (95% CI):-0.342 (-0.570, -0.114)], and increased residential PM 10 concentration [ β (95% CI): 0.001 (0.000, 0.002)] during the warm season, as well as the house far from driveway [ β (95% CI): 0.093 (0.013, 0.172)], house area less than 90 m 2 [ β (95% CI):-0.138 (-0.264, -0.013)], and lower residential xylene concentration [ β (95% CI):-0.006 (-0.011, -0.001)] during the cold season might be related to the elevated concentrations of ∑ 12PBDEs in household dust. Conclusion:The pollution of PBDEs in household dust in five northern cities is at a medium to high level. Years of house completion, frequency of cooking at home, residential PM 10 concentration, distance from house to driveway, house area, and residential xylene concentration may influence household PBDE concentrations.

ObjectiveTo evaluate the effect and safety of Jiuxin Pill （救心丸） on exercise tolerance and quality of life in patients with stable angina pectoris （SAP）. MethodsA randomised， double-blind， placebo-controlled， multicentre study design was used to enroll 170 patients of SAP from nine centres， which were divided into 85 patients each in the trial group and control group with 1∶1 ratio. Both groups maintained the original western medicine treatment plan， and added Jiuxin Pill or placebo respectively， 2 pills （0.05 g） each time twicely for 28 days. The main outcomes were total exercise time （TED） in the exercise treadmill test and Seattle Angina Questionnaire （SAQ） scores including physical limitation （PL）， angina stability （AS）， angina frequency （AF）， treatment satisfaction （TS）， and disease perception （DP）. The secondary outcomes were exercise treadmill test indicators including heart rate recovery in 1 min （HRR1）， metabolic equivalents （METs）， maximum magnitude of ST-segment depression， and the Borg rating of perceived exertion scale， the average number of angina attacks per week， withdrawal and reduction rate of nitroglycerin， traditional Chinese medicine syndrome scores， incidence of major adverse cardiovascular events. Safety indicators were evaluated and the occurrence of adverse events during the trial was recorded. Data was collected before treatment， day 28±2 in treatment period， and follow-up at day 56 which is 28±2 days after treatment period finished. ResultsEighty-four and eighty-five patients respectively from trial group and control group were included to the full analysis set （FAS） and safety analysis set （SS）. Compared with the group before treatment and with the control group after treatment， the trial group had higher TED， HRR1， and METs， and lower maximum magnitude of ST-segment depression and Borg rating of perceived exertion scores after treatment （P＜0.01）. Compared with the group before treatment and with the control group after treatment and at follow-up， the total SAQ score and scores of AS， AF， TS and DP of the trial group after treatment and at follow-up elevated， while the average number of angina attacks per week and traditional Chinese medicine syndrome scores reduced （P＜0.01）. There was no statistically significant difference in the withdrawal and reduction rate of nitroglycerin between groups （P＞0.05）. Major adverse cardiovascular events occurred in 1 case （1/84， 1.19%） in the trial group and 1 case （1/85， 1.18%） in the control group， and the difference between groups was not statistically significant （P＞0.05）. A total of 3 cases of adverse events occurred in the trial group （3/84， 3.57%）， and a total of 6 cases of adverse events occurred in the control group （6/85， 7.06%）， and there was no statistically significant difference in the incidence of adverse events between groups （P＞0.05）. ConclusionIn the treatment of SAP， Jiuxin Pill combined with conventional western medicine can further enhance exercise tolerance， improve quality of life， and demonstrate great safety.

ObjectiveTo observe the effect of Yangyin Xifeng Tongluo Formula （养阴熄风通络方） and its core herbs combination on prevention of ventricular precontraction （PVC）. MethodsExperiment 1： Forty SD rats were randomly divided into model group， formula group， core herb-pairs medium-dose group and amiodarone group， with 10 rats in each group. Rats in the model group were given 10 ml/（kg·d） of pure water by gavage， rats in the formula group were given 1.125 g/（kg·d） of Yangyin Xifeng Tongluo Granules （养阴熄风通络方颗粒） by gavage， rats in the core herb-pairs medium-dose group were given 0.585 g/（kg·d） of granules of core herb-pairs by gavage， and rats in the amiodarone group were given 18 mg/（kg·d） of amiodarone hydrochloride tablets by gavage. The rats in each group were gavaged once a day for 14 consecutive days， and then a PVC model was established using rat tail vein injection of aconitine 25 μg/kg to compare the mortality and incidence of PVC， ventricular tachycardia （VT） and ventricular fibrillation （VF）， the time of the appearance of PVC， and the duration of PVC in the rats in each group. Experiment 2： Sixty SD rats were randomly divided into model group， the amiodarone group， and the core herb-pairs of low， medium and high dose groups， 12 rats in each group. Rats in the model group were gavaged with 10 ml/（kg·d） of purified water， rats in the low， medium， and high dose groups were gavaged with 0.2925， 0.585， and 1.17 g/（kg·d） of the core herb-pairs granules respectively， and rats in the amiodarone group were gavaged with 18 mg/（kg·d） of amiodarone hydrochloride tablets. All of them were gavaged once a day. After 14 days， rats in each group were injected intravenously into the tail vein with aconitine 25 μg/kg， and then the rats in each group were observed to show the mortality and incidence of PVC， VT and VF， and the time of appearance and duration of PVC. ResultsExperiment 1： Compared with the model group， The difference in the incidence of PVC in rats of all groups was not statistically signi-ficant （P＞0.05）， and the mortality and incidence of VT and VF in rats in the formula group， the core herb-pairs medium-dose group， and the amiodarone group significantly reduced， with delayed time of the occurrence of PVC and shorter duration of the PVC （P＜0.05 or P＜0.01） as compared with the model group， whereas the difference between each group with medication intervention was not statistically significant （P＞0.05）. Experiment 2： There was no statistically significant difference in the incidence of PVC in all groups （P＞0.05）， and the mortality and incidence of VT and VF reduced in the core herb-pairs of low-， medium-， and high-dose groups and in the amiodarone group， and the appearance of PVC delayed and its duration shortened （P＜0.05 or P＜0.01） as compared with the control group， whereas the differences were not statistically significant in the comparison among groups with medication （P＞0.05）. ConclusionBoth Yangyin Xifeng Tongluo Formula and its core herb-pairs could delay the time of occurrence and shorten the duration of PVC.

Objective:To investigate the pollution levels and influencing factors of polybrominated diphenyl ethers (PBDEs) in household dust in five cities in northern China.Methods:Based on the "Chinese Indoor Environment and Health Surveillance" project carried out by the National Institute of Environmental Health, Chinese Center for Disease Control and Prevention in 2018-2019, during the warm season (April 2018 to September 2018) and the cold season (November 2018 to March 2019), Lanzhou in Northwest China, Shijiazhuang in North China, Panjin in Northeast China, Luoyang in Central China, and Qingdao in East China were selected as the research sites. A total of 87 families were recruited to study residences in real-life scenarios. At the same time, dust samples were collected to detect the concentration of PBDEs. The level of household environmental indicators was measured, and the residential building characteristics and family behavior habits were collected through questionnaires. A total of 142 valid dust samples and 140 valid questionnaires were obtained. The differences in PBDE concentrations across seasons, wind zones, residential building characteristics, and family habits were analyzed. The exploratory factor analysis was performed to investigate the possible sources of PBDEs, and multivariate linear regression was used to explore the factors influencing PBDEs in household dust.Results:The M ( Q1,Q3) of total PBDE concentrations in 142 household dust samples in five cities was 144.51 (106.61, 222.65) ng/g in the warm season and 145.10 (98.57, 180.65) ng/g in the cold season, respectively. There were seasonal differences in the concentration of ∑ 12PBDEs in Luoyang and Shijiazhuang ( P<0.01). The concentration of BDE-71 was highest among PBDE homologues, followed by BDE-66 and BDE-47. Three factors were extracted by exploratory factor analysis in the warm season, and the cumulative variance contribution rate was 67.90%. The multivariate linear regression showed that the house completion less than ten years [ β (95% CI): 0.186 (0.013, 0.359)], infrequent home cooking [ β (95% CI):-0.342 (-0.570, -0.114)], and increased residential PM 10 concentration [ β (95% CI): 0.001 (0.000, 0.002)] during the warm season, as well as the house far from driveway [ β (95% CI): 0.093 (0.013, 0.172)], house area less than 90 m 2 [ β (95% CI):-0.138 (-0.264, -0.013)], and lower residential xylene concentration [ β (95% CI):-0.006 (-0.011, -0.001)] during the cold season might be related to the elevated concentrations of ∑ 12PBDEs in household dust. Conclusion:The pollution of PBDEs in household dust in five northern cities is at a medium to high level. Years of house completion, frequency of cooking at home, residential PM 10 concentration, distance from house to driveway, house area, and residential xylene concentration may influence household PBDE concentrations.

Objective:To compare the effects of experiencing the black hole illusion in 2 training scenarios.Methods:Sixteen pilots, who were randomly divided into no reference group and finite reference group (8 pilots in each group) by visible substance in approaching, experienced black hole illusion through approaching flight under dark condition on the spatial disorientation simulator. No reference group conducted black hole approaching flight under complete dark environment besides the runway lights while the finite reference group had a day sight to runway before entering such complete dark approaching. The success rate of landing, the angle of departure from the runway and the angle of departure from the glide line of the two groups of pilots were statistically compared and analyzed.Results:There were 2 successful landings in no reference group, and 6 successful landings in finite reference group. There was a statistically significant difference in the success rates of landing between no reference group and finite reference group ( P>0.05). The deviation angle of the aircraft from the runway in no reference group was significantly higher than that in finite reference group ( t=4.04, P=0.005). The deviation angle of the aircraft from the glide line in no reference group was greater than that in finite reference group, and the difference was statistically significant ( t=3.64, P=0.008). Conclusions:The reference plays a key role in black hole approaching. The less reference in simulator training scenario the stronger black hole illusion pilot perceived and influence on operation. It is suggested that flying by instrument would be critical to overcome black hole illusion.

Objective To observe the effects of Shexiang Baoxin pill combined with intracoronary injection of nicorandil on myocardial perfusion and short-term prognosis after primary percutaneous coronary intervention in patients with ST-segment elevation myocardial infarction. Methods 151 patients with acute myocardial infarction after PPCI were enrolled in this study. Those patients were admitted to our hospital during January 2017 to January 2018. According to the numerical randomization method, 51 patients were selected as routine treatment group (group A), 50 patients with intracoronary injection of nicorandil (group B) and 50 patients received intracoronary injection of nicorandil plus oral Shexiang Baoxin pills (group C). Intra-operative corrected TIMI frame count (cTFC), postoperative TIMI grade 3 blood flow ratio, 2-hour ECG ST segment fallback >50% index, the incidence of major adverse cardiovascular events (MACE) during hospitalization and the incidence of angina and MACE within 3 months after surgery were evaluated. Results cTFC, 2 hours postoperative ECG ST segment fall >50% index in group B and C were better than group A (P<0.05). The results from group C were better than group B. Group C exhibited better results than group B and C in post-operative angina pectoris 3 months after surgery (P<0.05). Conclusion Shexiang Baoxin pills combined with intra-coronary injection of nicorandil can improve myocardial perfusion and short-term prognosis after primary percutaneous coronary intervention in patients with ST-segment elevation myocardial infarction