Objective To observe the therapeutic effect of poly tetrahydrofurfuryl-co-lactic acid (copolymer C 4) as the biodegradable vitreous substitutes on rhegmatogenous retinal detachment. Methods Vitreoretinal surgery with copolymer C 4 tamponades was performed on 32 pigmented rabbits (64 eyes) with rhegmatogenous retinal detachment. The rate of reattached retina and the post-operative complications were observed. Results Three months after the operation, reattached retina was found in 96.4%, glaucoma in 5.5%, cataract in 10.9%, and copolymer emulsion in 10.2% of all the eyes. Conclusion copolymer C 4 may withstand the retinal tear effectively for 3 months, and can be a valuable vitreous substitutes.

As the largest organ in mammals, skin is the first protective barrier against external stimuli. Sweat glands are one of the important cutaneous appendages and play an important role in maintaining electrolyte balance and regulating body temperature. Patients with extensive deep burns usually suffer from damage to deep dermis or the entire skin layer. The damaged sweat glands are difficult to repair and even unable to regenerate, which seriously affects patients' sweating and thermo-regulation function, reduces patients' quality of lives. How to achieve the functionalization of sweat glands has become one of the important researches in regenerative medicine of damaged skin. This review summarizes the translational and application technology of sweat gland regeneration and repair using stem cells and tissue engineering, in order to provide a theoretical basis for the research of sweat gland regeneration.

Objective:To explore the application value of ultrasound in the early noninvasive monitoring of acute compartment syndrome model, and to provide reference for further clinical applications.Methods:This was a prospective self-controlled study. A model of healthy volunteers with acute compartment syndrome was established by cuff compression. The random method was used to determine the experimental side and the control side. The experimental side cuff was given 0, 20, 30, 40, 50, 60, 70, and 80 mmHg pressure in sequence, while the control side cuff was kept uncompressed at all times. Each pressure on the experimental side lasted for 5 min, during which the ultrasound was used to measure the blood flow waveform and vascular structure of the bilateral popliteal artery, popliteal vein and dorsal plantar artery. Statistical analysis was performed using repeated measures analysis of variance and multivariate analysis of variance.Results:The study included 25 healthy volunteers. There was no statistically significant difference in calf circumference and anterior tibial compartment thickness ( P = 0.314 and 0.678). During compression, the volunteers' heart rate and blood pressure were stable ( P = 0.235 and 0.358). On the experimental side, the maximum blood flow velocity of the popliteal artery during systole increased with the increase of pressure ( P<0.001), and the minimum blood flow velocity of the popliteal artery increased with the increase of pressure ( P<0.001). When pressurized by 30 mmHg, the maximum blood flow velocity of the popliteal artery on the experimental side was significantly higher than that on the control side [(73 ± 19) cm/s vs (59 ± 14) cm/s, P=0.023)]. When pressurized by 20 mmHg, the minimum blood flow velocity of the popliteal artery on the experimental side was significantly higher than that on the control side [(-28 ± 8) cm/s vs (-22 ± 6) cm/s, P=0.012)]. With the increase of pressure, the diastolic retrograde arterial flow ratio of the experimental side gradually increased ( P <0.001), and when the pressure was increased by 20 mmHg, the diastolic retrograde arterial flow ratio of the experimental side of the popliteal artery increased significantly [(0.42 ± 0.14) cm/s vs (0.30 ± 0.12) cm/s, P=0.009)]. The systolic prograde arterial flow ratio of the dorsal artery in the experimental side decreased with the increase of pressure ( P = 0.024). Conclusions:Increased limb compartment pressure can significantly change the arterial flow waveform of the proximal and distal arteries, and ultrasound can be used as an early monitoring tool for acute compartment syndrome.

[Objective] To conduct a retrospective statistical comparison of alanine aminotransferase (ALT) test values in blood donors prior to blood collection, aiming to analyze the objective characteristics of the population with elevated ALT levels (ALT>50 U/L) and provide reference data for adjusting the screening eligibility threshold for ALT. [Methods] The preliminary ALT screening data of 30 341 blood donor samples collected prior to blood donation from three smart blood donation sites at the Shenzhen Blood Center between 2022 and 2023 were extracted and compared with data from a health examination department of a tertiary hospital in Shenzhen (representing the general population, n=24 906). Both datasets were categorized and statistically described. A retrospective analysis was conducted to examine the associations between ALT test results and factors such as donors' gender, age, ethnicity, donation site, donation season, and frequency of blood donation. [Results] The ALT levels in both blood donors and the general population were non-normally distributed. The 95th percentile of ALT values was calculated as 61.4 U/L (male: 67.8 U/L, female: 39.3 U/L) for blood donors and 58.1 U/L (male: 63.7 U/L, female: 51.2 U/L) for the general population. The non-compliance rates (ALT>50 U/L) were 7.65% (2 321/30 341) in blood donors and 7.08% (1 763/24 906) in the general population. There were significant differences (P<0.05) in the ALT failure rate among blood donors based on gender, age, and donation site, but no significant differences (P>0.05) during the blood donation season. There was no statistically significant difference (P>0.05) in the positive rates of four serological markers (HBsAg, anti HCV, HIV Ag/Ab, anti TP) for blood screening pathogens between ALT unqualified and qualified individuals (2.05% vs 1.5%). If the ALT qualification threshold was raised from 50 U/L to 90 U/L, the non qualification rates of male and female blood donors would decrease from 9.82% (2 074/21 125) to 2.23% (471/21 125) and from 2.70% (249/9 216) to 0.75% (69/9 216), respectively. Among the 154 blood donors who donated blood more than 3 times, 88.31% of the 248 ALT test results were in the range of 50-90 U/L. Among them, 9 cases had ALT>130 U/L, and ALT was converted to qualified in subsequent blood donations. [Conclusion] There are differences in the ALT failure rate among blood donors of different genders and ages, and different blood donation sites and operators can also affect the ALT detection values of blood donors. The vast majority of blood donors with ALT failure are caused by transient and non pathological factors. With the widespread use of blood virus nucleic acid testing, appropriately increasing the ALT qualification threshold for blood donors can expand the qualified population and alleviate the shortage of blood sources, and the risk of blood safety will not increase.

[Objective] To investigate the factors associated with alanine aminotransferase (ALT) abnormalities in multi-ethnic blood donors across five Zang autonomous prefectures in the plateau regions of Qinghai Province, and to provide evidence for ensuring blood safety and formulating screening strategies. [Methods] A retrospective analysis was performed on the ALT abnormal test results of blood donors in the Zang autonomous prefectures of Qinghai from 2022 to 2024. The correlations between ALT levels and factors including gender, age, altitude, and infectious markers were investigated. [Results] The overall ALT unqualified rate among blood donors in this region was 9.01%. Significant differences in ALT levels were observed across genders and age groups (P<0.05). Variations in ALT abnormality rates were also noted among different plateau regions (P<0.05). Overall, ALT values exhibited an increasing trend with rising altitude. The average ALT unqualified rates were 11.19% in Zang donors, 7.96% in Han donors, and 4.79% in donors from other ethnic groups (P<0.05). No statistically significant association was observed between ALT abnormality and the presence of HBV/HCV infectious markers (P>0.05). [Conclusion] In the plateau areas of Qinghai, multi-ethnic blood donors have a relatively high ALT levels and ALT unqualified rates, showing distinct regional characteristics. ALT elevation in voluntary blood donors is related to non-pathological factors such as gender, age, and dietary habits, but not to infectious indicators.