Objective:To provide a reference and basis for developing more targeted and effective intervention measures for the mental health of officers and soldiers stationed on islands and reefs in a certain sea area of China.Methods:Based on the previous studies，the research group conducted a cross-sectional survey on the mental health and sleep status of the officers and soldiers of different specialties stationed on islands and reefs in a certain sea area，and evaluated the mental health and sleep status of officers and soldiers of different specialties stationed on islands and reefs for the first time.Results:Among the officers and soldiers in the survey，106 were with suboptimal mental health status，accounting for 23.77% of all objects of study. Among them，there were 42（29.37%）in the ground unit group，41（20.92%）in the aviation unit group，18（30.51%）in the observation unit group，and 5（10.42%）in the electronics unit group. There were statistically significant differences among the 4 groups（ P=0.023）. The total average SCL-90 scores of the ground unit group，the aviation unit group，the observation unit group，and the electronics unit group were 1.35，1.25，1.36，and 1.20，respectively. The total scores of SCL-90 were 121.10，112.73，122.02，and 108.17，respectively. Among the officers and soldiers in the 4 groups，there were statistically significant differences in the factors and in total scores of SCL-90，i.e.，somatization，obsessive-compulsive symptoms，interpersonal sensitivity，depression，anxiety，paranoia，sleep，and diet（ P < 0.05）. After adjusting for other factors，the results of pairwise comparison showed the aviation unit group was superior to the ground unit group. The average PSQI scores of the ground unit group，the aviation unit group，the observation unit group，and the electronics unit group were 9.1，7.5，8.5，and 5.5，respectively. There were statistically significant differences in sleep quality score，sleep time score，sleep efficiency score，hypnotic drugs score，daytime function score，and in the PSQI total scores among the 4 groups（ P<0.05）. Conclusion:The officers and soldiers in the ground unit and observation unit stationed on islands and reefs in a certain sea area of China have a relatively poor mental health and sleep status. The length of time on the islands and reefs affects mental health and sleep. A more scientific regular rotation scheme should be developed.

Objective:To investigate the clinical efficacy of hyperbaric oxygen（HBO）comprehensive treatment of sudden sensorineural hearing loss（SSHL）and the related influencing factors.Methods:A total of 310 SSHL patients admitted to PLA No.971 Hospital from January 2017 to June 2019 were selected and divided into control group（ n=154）and observation group（ n=156）. The control group was on medication only，while the observation group was treated with medication combined with HBO. The therapeutic effects were compared between the two groups. The rank sum test was adopted to test the significance of gender，age，comorbid diabetes mellitus（DM），hypertension，onset to treatment time（OTT），type of hearing loss curve，and degree of hearing impairment between the patients whose treatment was effective and those whose treatment was ineffective in the observation group. Logistic regression was used to analyze the independent factors affecting the prognosis. Results:After treatment，the total effective rate was 80.33% in the observation group and 66.90% in the control group，and there were statistically significant differences between the two groups（ P<0.05）. Among the patients in the observation group，there was no statistically significant difference between those whose treatment was effective and those whose treatment was ineffective in terms of gender，DM，and hypertension（ P>0.05），while there were statistically significant differences in terms of age，OTT，type of hearing loss curve，and degree of hearing loss（ P<0.05）. The results of logistic regression analysis showed that the OTT and the type of hearing loss curve were the independent influencing factors for the HBO comprehensive treatment of SSHL. Conclusion:HBO comprehensive treatment has obvious curative effects in treating SSHL. The OTT and the type of hearing loss curve are the influencing factors of the clinical efficacy of HBO combined with medication in treating SSHL．

Objective:To explore the methods and standards of aeromedical evaluation for military aircrew with cerebrovascular malformations（CVMs）.Methods:A retrospective analysis was conducted on the medical records of 20 aircrew with CVMs who were admitted to the PLA Air Force Medical Center from January 2000 to January 2020.Results:There were 11 cases with cerebral cavernous angioma（CCA）［CCA locations：occipital lobe（three cases），frontal lobe（two cases），temporal lobe（two cases），cerebellum（one case），posterior horn of left ventricle（one case），right basal ganglia region（one case），brainstem（one case）］. There were four cases with cerebral aneurysm（CA），three cases with cerebral venous aneurysms（VAs），and two cases with brain arteriovenous malformations（bAVMs）. Among them，11 aviators were qualified for flight，three were temporarily disqualified from flight，and six were disqualified from flight.Conclusion:The aeromedical evaluation of CVMs in military aircrew should consider the type，size，location of the lesions，symptoms，signs，and complications of the malformations，as well as the types of aircraft，duties，flight experience，personal plan，and the opinions of working unit. It should be carried out in accordance with relevant standards and learn from the standard practices in developed countries and the 1% rule of civil aviation.

Objective:To design a shipboard personnel decontamination system for a certain type of integrated rescue ship, which can be used to decontaminate the wounded in nuclear emergency rescue at sea.Methods:To decontaminate as many people as a shipboard decontamination system could in a limited space, we redesigned the layout of cabins and the decontamination process of the system. We broke down the system into different functions, estimated the time consumed by each function, and used the FlexSim to model and simulate the system.Results:The simulation system was set to run as fast as a common deep submersible lifeboat did in the case of a rescue. The utilization rate of most functioning objects remained between 48.6% and 82.9%. The average utilization rate of the skin drying positions and the dressing positions was less than 40%. However, it was acceptable considering multiplicity was required to keep at least one object operational.Conclusions:The decontamination system presented in this study has a scientific layout and a clear decontamination process. It can meet most of the needs of decontamination in nuclear emergency rescue at sea.

Objective:To investigate and analyze the mental health status and influencing factors of the troops stationed and training in remote islands and reefs during COVID-19 pandemic.Methods:A total of 577 officers and sailors were selected as objects of study from the troops stationed and training in remote islands and reefs in 2020 by convenient sampling method．The investigation was carried out by handing out and returning a questionnaire on-the-spot．The questionnaire was developed from the 90-item symptom list（SCL-90），and all the questions and choices in the questionnaire were uniformed according to the same instruction．A total of 579 questionnaires were handed out，and 577 valid questionnaires were collected；the effective rate was 99.65%．The univariate and multivariate analyses were used to screen the influencing factors related to the results of the above-mentioned investigation.Results:The average score of SCL-90 was 122.7±49.76，which was significantly lower than the military norm（ P<0.01）．The multivariate analysis showed that the total score was negatively correlated with the relationship with other colleagues，the relationship with parents，and the relationship with spouse（ P<0.01）；while it was positively correlated with the military situation in the South China Sea and the family economic situation（ P<0.05）. Conclusion:The mental health status of the troops stationed and training in remote islands and reefs were generally good．The mental status of the troops were closely related to intimate relationship，interpersonal relationship，and military environment.

Objective:To investigate the clinical efficacy of 3D printed individual model combined with hyperbaric oxygen（HBO）therapy in treating complex ankle fracture，and to evaluate the therapy’s effect on prognosis.Methods:The clinical data of 45 patients with complex ankle fractures treated in the Department of Orthopedics of Penglai People’s Hospital from January 2017 to January 2021 were analyzed retrospectively. According to different treatment methods，they were divided into 3D model group（ n=21）and combined group（ n=24）. In addition，other 37 complex ankle fracture patients，who were treated in the Department of Orthopedics of Penglai People’s Hospital from January 2014 to December 2016 and had complete clinical data and detailed follow-up records，were selected as control group（conventional group）. The conventional group was given traditional surgery for complex ankle fractures，i.e.，after fracture reduction，the medial malleolus was fixed with steel wire tension band or screws，and the lateral malleolus was fixed with screws and steel plates. In the 3D model group，the strategy and approach of surgical operation were simulated and designed based on 3D printed individual models before operation. The combined group was additionally treated with HBO on the basis of the treatment of the 3D model group. The operation time，hospital length-of-stay，time to first ambulation，clinical fracture healing time，and the intraoperative bleeding loss of the three groups were observed and recorded，so as to compare the therapeutic effects of the three groups. All patients were followed up for one year. The functional recovery of postoperative ankle fracture was evaluated by Olerud-Molander Ankle Score（OMAS）. The incidences of postoperative complications were recorded. Results:The total effective rate of the 3D model group（95.24%）and the combined group（100.00%）were significantly higher than that of the conventional group（72.97%）（ P<0.05）. Regarding the operation time，hospital length-of-stay，time to first ambulation，clinical fracture healing time，and intraoperative bleeding loss，the results of the 3D model group and the combined group were significantly shorter or lower than those of the conventional group（ P<0.05）；the time to first ambulation and clinical fracture healing time of the combined group were significantly shorter than those of the control group（ P<0.05）；there was no statistically significant difference in the operation time，hospital length-of-stay，and intraoperative bleeding loss between the 3D model group and the combined group（ P>0.05）. All patients were followed up with a follow-up rate of 100.0%. The OMAS outcomes of the 3D model group and the combined group at the 1st，3rd，6th，and 12th month after operation were significantly higher than those of the conventional group at the same time points（ P<0.05），and the OMAS outcomes of the combined group at the 1st，3rd，6th，and 12th month after operation were significantly higher than those of 3D model group at the same time points（ P<0.05）. The incidence of postoperative complications was 16.22% in the conventional group，the incidence of deep venous thrombosis（DVT）was 4.8% in the 3D model group，and no complication was found in the combined group. Conclusion:The 3D printed individual model combined with HBO therapy has sound clinical efficacy and prognosis in treating complex ankle fracture. It can shorten the clinical fracture healing time and facilitate the rapid recovery of ankle function，therefore，it should be widely promoted in clinical practices.

Objective:To analyze the oral health condition of the crew of a ship by carrying out oral examination，so as to provide reference for offering better medical services.Methods:A total of 816 crew members of a ship were divided into two groups：new crew group with 186 members（onboard time ≤ 1 year）and old crew group with 630 members（onboard time > 1 year）. Indicators related to dental caries，periodontal disease，and wisdom teeth were recorded and analyzed statistically.Results:Among the 816 crew members，the caries prevalence rate was 42.7%，the per capita caries was 0.98，the periodontal health rate was 22.3%，the calculus detection rate was 75.9%，the materia alba detection rate was 9.27%，and the wisdom teeth detection rate was 49.6%. The new crew had worse rank sum test results than the old crew regarding the number of dental caries，decayed-missing-filled teeth，and the calculus index（CI）（ P<0.05）. While the new crew had better results than the old crew regarding the number of teeth loss due to caries（ P<0.05）. In all，799 teeth needed dental treatment；71 teeth were missing and needed to be repaired；619 patients needed supragingival scaling；and 1，005 impacted wisdom teeth needed to be removed. Conclusion:The oral health of the crew is not optimistic，therefore，more oral medical services are needed. Early prevention of oral diseases and oral health education should be strengthened，early treatment of oral diseases should be carried out routinely，and oral examination and intensive treatment should be conducted regularly.

Objective:To investigate the prevalence of hyperuricemia in tropical island population，and to analyze the risk factors of urinary calculi in patients with hyperuricemia or gout.Methods:A total of 638 samples of tropical island people who received annual physical examinations were the subjects of our study. Their general information，renal function indicators，and urological ultrasound data were collected. The intergroup comparison and binary Logistic regression were applied for statistical analysis.Results:The incidences of hyperuricemia and gout were 36.4% and 1.3%，respectively，in tropical island population. The incidences of urinary calculi in cases with normal uric acid，asymptomatic hyperuricemia，and gout were 14.3%，23.9%，and 72.7%，respectively. A positive correlation was found between serum creatinine and uric acid levels among the 638 cases（ r = 0.25， P < 0.001），and the level of urea nitrogen increased slightly with the increase of uric acid（ r = 0.07， P = 0.051）. The elevated serum uric acid（ OR = 1.0， P = 0.013）and history of gout（ OR = 7.9， P = 0.004）were risk factors for the occurrence of urinary calculi in tropical island population. The combination of these two parameters could predict the occurrence of urinary calculi with AUC = 0.601，which was slightly better than using serum uric acid level alone with AUC = 0.598（ P = 0.158）. Conclusion:The proportion of patients with hyperuricemia in tropical islands is significantly higher than that in non-tropical regions. The serum creatinine and urea nitrogen levels are positively correlated with uric acid levels among the cases. The elevated serum uric acid and history of gout are risk factors for the occurrence of urinary calculi in tropical island population. The combination of these two parameters has a certain role in predicting the occurrence of urinary calculi.

Objective:To observe the efficacy of Long’s bone setting manipulation combined with hyperbaric oxygen（HBO）in the treatment of vertigo caused by cervical spondylosis of the vertebral artery type（CSA）.Methods:A total of 143 patients with CSA and vertigo treated in the Department of Rehabilitation Medicine of the Second Hospital of Shanxi Medical University from April 2019 to July 2020 were prospectively included as the research subjects by a random number table. The patients were divided into control group（72 cases）and observation group（71 cases）. The control group was treated with Long’s bone setting manipulation，while the observation group was treated with Long’s bone setting manipulation combined with HBO. The overall curative effect of the two groups was evaluated and compared by Traditional Chinese Medicine Syndrome Score Scale（TCMSSS）. The vertigo symptom of the two groups was evaluated by Dizziness Handicap Inventory（DHI）. The hemodynamic indexes of vertebral artery，including left vertebral artery（LVA），right vertebral artery（RVA）and basilar artery（BA），were detected and compared between the two groups by Doppler ultrasound.Results:After treatment，the overall curative effect of the observation group was better than that of the control group，with statistically significant difference（ P < 0.05）. No statistically significant difference in DHI scores or vertebral artery hemodynamic indexes between the two groups was observed before treatment（ P > 0.05）. After treatment，the observation group had lower DHI scores while higher indexes of LVA，RVA and BA compared with those in the control group（ P < 0.05）. Conclusion:Long’s bone setting manipulation combined with HBO has better efficacy than Long’s bone setting manipulation alone in the treatment of vertigo caused by CSA，which is more conducive to reducing vertigo symptoms and improving vertebral artery hemodynamics.

Objective:To explore the effects of hyperbaric oxygen-assisted butylphthalide on patients with acute ischemic stroke and the effects of serum endothelin-1（ET-1），thromboxane B2（TXB2）and vascular endothelial growth factor（VEGF）levels.Methods:A total of with acute ischemic stroke were selected，and randomly divided into two groups（according to the order of admission）. The control group was treated with butylphthalide，and the combined group was treated with hyperbaric oxygen-assisted butylphthalide，the treatment time was 14 days. The National Institutes of Health Stroke Scale（NIHSS）score and Barthel index score，clinical efficacy，serum ET-1，TXB2 and VEGF levels，coagulation function，hemorheology index，and adverse reactions between the two groups of patients were compared.Results:Compared with before treatment，the NIHSS scores of the two groups of patients were significantly reduced after treatment（ P<0.05），and the NIHSS scores of the combined group after treatment were significantly lower than those of the control group（ P<0.05）. After treatment，the Barthel index scores of the two groups were significantly higher than those before treatment（ P<0.05），and after treatment，compared with the control group，the combination group had significantly higher Barthel index（ P<0.05）. After treatment，there was a significant difference in the distribution of curative effects between the two groups，and compared with the control group（88.03%），the total effective rate of combined group（95.77%）was significantly higher（ χ 2=5.724， P<0.05）. Compared with before treatment，serum ET-1 and TXB2 levels of the two groups were significantly lower after treatment，compared with the control group，the serum ET-1 and TXB2 levels of combination group were significantly lower，the VEGF levels of the two groups were significantly higher than before treatment，and compared with the control group，the combination group had significantly higher VEGF levels（ P<0.05）. Compared with before treatment，thrombin time（TT），prothrombin time（PT），activated partial thromboplastin time（APTT）in both groups were higher after treatment，and the TT，PT，and APTT of the combination group were significantly higher than those of control group（ P<0.05）. There were no statistically significant difference in incidence of adverse reactions between the two groups（ P>0.05）. Conclusion:Hyperbaric oxygen-assisted butylphthalide has a significant clinical effect on the treatment of patients with acute ischemic stroke，and reduce vascular endothelial damage，improve blood coagulation function and hemorheology，and it is safe and reliable.