Patients with acute human immunodeficiency virus (HIV) infection are the critical source of infection due to high viral load and strong transmission ability. The vast majority of patients in the acute infection stage have no or only mild clinical symptoms, and their screening and diagnosis often rely on laboratory tests. However, there are still some difficulties in early screening and detection for HIV infection due to the detection window period. In recent years, laboratory testing for acute HIV infection has made great progress. This article reviews the progress in laboratory testing of acute HIV infection, in order to provide a reference for follow-up related research.
Human motion control system has a high degree of nonlinear characteristics. Through quantitative evaluation of the nonlinear coupling strength between surface electromyogram (sEMG) signals, we can get the functional state of the muscles related to the movement, and then explore the mechanism of human motion control. In this paper, wavelet packet decomposition and n:m coherence analysis are combined to construct an intermuscular cross-frequency coupling analysis model based on wavelet packet-n:m coherence. In the elbow flexion and extension state with 30% maximum voluntary contraction force (MVC), sEMG signals of 20 healthy adults were collected. Firstly, the subband components were obtained based on wavelet packet decomposition, and then the n:m coherence of subband signals was calculated to analyze the coupling characteristics between muscles. The results show that the linear coupling strength (frequency ratio 1:1) of the cooperative and antagonistic pairs is higher than that of the nonlinear coupling (frequency ratio 1:2, 2:1 and 1:3, 3:1) under the elbow flexion motion of 30% MVC; the coupling strength decreases with the increase of frequency ratio for the intermuscular nonlinear coupling, and there is no significant difference between the frequency ratio n:m and m:n. The intermuscular coupling in beta and gamma bands is mainly reflected in the linear coupling (1:1), nonlinear coupling of low frequency ratio (1:2, 2:1) between synergetic pair and the linear coupling between antagonistic pairs. The results show that the wavelet packet-n:m coherence method can qualitatively describe the nonlinear coupling strength between muscles, which provides a theoretical reference for further revealing the mechanism of human motion control and the rehabilitation evaluation of patients with motor dysfunction.
To better analyze the problem of abnormal neuromuscular coupling related to motor dysfunction for stroke patients, the functional coupling of the multichannel electromyography (EMG) were studied and the difference between stroke patients and healthy subjects were further analyzed to explore the pathological mechanism of motor dysfunction after stroke. Firstly, the cross-frequency coherence (CFC) analysis and non-negative matrix factorization (NMF) were combined to construct a CFC-NMF model to study the linear coupling relationship in bands and the nonlinear coupling characteristics in different frequency ratios during elbow flexion and extension movement. Furthermore, the significant coherent area and sum of cross-frequency coherence were respectively calculated to quantitatively describe the intermuscular linear and nonlinear coupling characteristics. The results showed that the linear coupling relationship between multichannel muscles was different in frequency bands and the overall coupling was stronger in low frequency band. The linear coupling strength of the stroke patients was lower than that of the healthy subjects in different frequency bands especially in beta and gamma bands. For the nonlinear coupling, the intermuscular coupling strength of stroke patients in different frequency ratios was significantly lower than that of the healthy subjects, and the coupling strength in the frequency ratio 1∶2 was higher than that in the frequency ratio 1∶3. This method can provide a theoretical basis for exploring the intermuscular coupling mechanism of patients with motor dysfunction.
Objective To analyze the clinical epidemiological characteristics and trends of newly reported human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS) patients in Panzhihua Central Hospital, and provide a scientific basis for general hospitals to formulate precise prevention and control measures. Methods The information such as gender, age, ethnicity, and transmission route of the newly reported HIV/AIDS patients in Panzhihua Central Hospital from 2010 to 2019 was retrospectively analyzed. Results A total of 551545 patients were screened for HIV in Panzhihua Central Hospital between 2010 and 2019, among them, 1091 patients were confirmed as HIV infection finally, with a confirmed positive rate of 0.20%. The number of confirmed cases and the positive rate continued to increase from 2010 to 2017, and obviously declined after 2018. The male to female ratio of newly diagnosed HIV/AIDS patients was 2.86∶1, and the 31-45 years old middle-aged and young adults were the majority (31.16%). The majority of HIV/AIDS patients were identified as married (58.02%), primary school education (40.70%), farmers (46.38%), and Han nationality (79.84%). Yi nationality also had a high proportion (18.52%) with an increasing trend year by year (χ2trend=8.131, P=0.004). Yi nationality patients were mainly from Liangshan Yi Autonomous Prefecture (58.42%). A high proportion of 50.32% of patients came from other cities, among them, the proportion of patients from Liangshan Yi Autonomous Prefecture increased over time (χ2trend=13.608, P<0.001). The transmission routes were mainly through heterosexual sex (90.93%), with an upward tendency of proportion (χ2trend=22.137, P<0.001), and transmission through drug abuse was following (4.49%), with an downward tendency of the proportion (χ2trend=11.758, P=0.001). Significant differences in transmission routes were observed between males and females (P=0.020), and between Han nationality and Yi nationality (P<0.001). Conclusion The newly repored HIV/AIDS patients in Panzhihua Central Hospital have a high proportion of minority nationality, and heterosexual transmission is the main transmission route.
Objective To investigate the construction and services of the community health service system in Shifang, as well as the satisfaction of community residents with the community health services and the post-disaster emergency response capability of the community hospital, so as to provide decision-making suggestions on better reconstruction of the community health service system and improvement of its post-disaster emergency response capability. Methods There were 4‰ of community residents in Fangting town were selected by convenience sampling for a face-to-face interview using a questionnaire. Logistic regression was used to identify the influencing factors of residents’ satisfaction with community health services. Results A total of 250 questionnaires were conducted for face-to-face interviews, and 246 ones were retrieved (response rate 98.4%). Residents’ understanding and satisfactory degree of the community health service were 41.1% and 36.6%, respectively. Health education, medical expenses and medical insurance were the main factors influencing the residents’ satisfactory degree of community health services (P=0.050, 0.001, and 0.001). The proportions of disaster / disaster prevention education, exercises of post-disaster contingency plans, and psychological intervention as well as rehabilitation for residents were 37.4%, 10.6%, and 12.6%, respectively. Conclusion Community health services have not been widely accepted by community residents, and the satisfactory degree is low. The residents’ understanding and adaptation can be improved by strengthening the community health service propaganda. Strengthening health education, improving the quality of services, controlling costs, and introducing medical insurance reimbursement mechanism can increase the residents’ satisfactory degree. Including disaster emergencies into basic tasks can strengthen the emergency response capability and then provide guarantee for the residents’ health.