Objective To investigate the prevalence and influencing factors of work-related musculoskeletal disorders (WMSDs) in neck, shoulders and lower back among power grid workers. Methods A total of 371 workers from a power grid enterprise in Guangdong Province were selected as the research subjects using the convenience sampling method. A cross-sectional survey of WMSDs in the neck, shoulders and waist of the workers was conducted using the modified Musculoskeletal Disorders Questionnaire. Results The overall prevalence of WMSDs among the power grid workers was 62.8%, with prevalence of 37.2%, 33.7% and 32.1% for WMSDs in neck, shoulders and lower back, respectively. Binary logistic regression analysis showed that power grid workers who did not maintain a good sitting posture or were unable to maintain good sitting posture over prolonged periods had a higher risk of neck WMSDs than those who maintained a good sitting posture (both P<0.01). A higher frequency of head-down posture during work was associated with an increased risk of neck WMSDs (both P<0.05). Female workers had a higher risk of shoulder WMSDs than male workers (P<0.05). A higher frequency of early awakening with inability to fall back asleep, as well as a higher frequency of head-down posture during work, were both associated with an increased risk of shoulder WMSDs (all P<0.05). Workers with a sedentary habit had a higher risk of shoulder WMSDs than those without (P<0.01). Workers with insufficient rest time had a higher risk of shoulder WMSDs than those with sufficient rest time (P<0.01). Both maintenance workers and managers had a higher risk of lower back WMSDs than workers in other occupational categories (all P<0.05). Workers who experienced nocturnal awakening with difficulty falling back asleep at frequency of several times per year, ≥1 time /month, ≥1 time /week, had higher risk of lower back WMSDs than those who never experienced such problem (all P<0.05). Workers with a sedentary habit and those uncertain about having a sedentary habit both had a higher risk of lower back WMSDs than those without (both P<0.05). Greater forward neck flexion during work was associated with an increased risk of lower back WMSDs (both P<0.05). Workers who occasionally tilted their necks to the side while working had a higher risk of lower back WMSDs than those who did not (P<0.05). Conclusion WMSDs are highly prevalent among power grid workers, particularly affecting the neck, shoulder, and waist. Influencing factors include individual characteristics, behavioral habits, work organization, work posture, and workload. Maintaining proper posture and adequate rest may reduce the risk of WMSDs.

Objective To investigate the situation and influencing factors of preserved ratio impaired spirometry (PRISm) among dust-exposed workers in a wooden furniture manufacturing enterprise. Methods A total of 562 dust-exposed workers from a wooden furniture enterprise in Guangdong Province were selected as the study subjects using the convenience sampling method. The result of health-status questionnaire and occupational medical examinations among the participants were studied, and the influencing factors of PRISm were studied using the binary logistic regression analysis method. Results The detection rate of PRISm was 22.1% (124/562) among the study subjects. Binary logistic regression result showed that male workers had a higher risk of PRISm than female workers (P<0.01). Current smokers had a higher risk of PRISm than non-smokers (P<0.05). Workers with longer duration of exposure to occupational hazards had a higher risk of PRISm (P<0.05), those with higher grade of small-airway dysfunction had a higher risk of PRISm (P<0.01). In terms of body mass index, overweight or obese workers showed a higher detection rate of PRISm than those with normal weight (P<0.01). Greater amount of smoking pack per year had a higher risk of PRISm (P<0.01). Conclusion Dust-exposed workers in the wooden furniture manufacturing industry show a relatively high detection rate of PRISm. Male, current smoker, longer duration of exposure to occupational hazards, small airway dysfunction, overweight or obese, and smoking pack per year are influencing factors of PRISm among the dust-exposed workers in the wooden furniture manufacturing industry.

Objective To analyze a case of violations by an occupational medical examination (OME) institution and to explore the key control points for the supervision and management of OME institutions, as well as the core role of quality assessment in this context. Methods An OME institution suspected of illegal activities was used as the study subject. Retrospective analysis was conducted. Clues of suspected violations were identified by an on-site quality assessment. After investigation and verification by the local health authorities, legal action was taken against the institution for its violations. Results During an on-site quality assessment, the Guangdong Province OME quality control expert group discovered that the OME institution violated regulations, including unqualified personnel file, exceeding the scope of services category, issuing false reports, failing to report suspected occupational diseases on time, and failing to notify workers about suspected occupational diseases as required. The evidence was then submitted to the Guangdong Province OME Quality Control Center, which subsequently forwarded the case to local health administration department for filing and investigation. After the investigation, penalties were imposed on the OME institution for its illegal activities. Conclusion The key supervision and inspection points in the quality assessment of OME institutions include personnel file configuration, the quality control management system and its implementation, the quality of OME reports, and information reporting. Quality assessment plays a pivotal role in ensuring the legal and compliant practice of OME institutions, safeguarding the health rights and interests of workers, and enhancing the overall standard of the OME industry.

Objective:To study the effect of repetitive facilitative exercise (RFE) combined with repetitive transcranial magnetic stimulation (rTMS) on upper limb motor function in subacute stroke patients.Methods:A total of 80 patients with subacute stroke diagnosed and treated in the First Affiliated Hospital of Wenzhou Medical University from November 2023 to March 2024 were prospectively selected and divided into control group, RFE group, RFE+ low frequency rTMS group and RFE+ high frequency rTMS group by random number table method, with 20 cases in each group. The control group received conventional rehabilitation therapy, the RFE group received conventional rehabilitation therapy +RFE, the RFE+ low frequency rTMS group received conventional rehabilitation therapy +RFE+ low frequency (1 Hz) rTMS therapy, and the RFE+ high frequency rTMS group received conventional rehabilitation therapy +RFE+ high frequency (10 Hz) rTMS therapy. All of four groups were treated continuously for 2 weeks. The changes of Fugl-Meyer Scale (Motor Function) Upper Limb (FMA-UE) score, Modified Ashworth Scale (MAS) score, Modified Barthel Index (MBI) score, hemiplegic hand grip strength and BrunnstromScale (BRSS) score before and after treatment were compared among the four groups.Results:There were no statistical differences in the FMA-UE score, MAS grade, MBI score and hemiplegic hand grip strength among the four groups before treatment ( P>0.05). After treatment, the FMA-UE, MBI scores and hemiplegic hand grip strength were increased in the four groups, and MAS grade were decreased, there were statistical differences ( P<0.05). RFE+ low-frequency rTMS group had the highest FMA-UE, MBI score and hemiplegic hand grip strength, and MAS grade was the lowest, and compared with RFE+ high-frequency rTMS group, there were statistical differences : (43.65 ± 2.11) scores vs. (40.95 ± 2.12) scores, (49.20 ± 4.06) scores vs. (44.80 ± 2.48) scores, (32.45 ± 2.59) kg vs. (29.30 ± 2.94) kg, (0.37 ± 0.09) grade vs. (0.56 ± 0.10) grade, P<0.01. The BRSS unupgradingrate among the four groups after treatment were 10/20, 8/20, 2/20, 5/20, there was statistical difference ( χ2 = 8.65, P = 0.031), and the RFE+ low-frequency rTMS group had the lowest number of BRSS unupgraded cases. Conclusions:The efficacy of RFE combined with low-frequency rTMS in the treatment of subacute stroke is obvious, which is conducive to promoting the recovery of muscle strength, grip strength and motor function of the hemiplegic side of the patients.

Objectives:To investigate the clinical value of cardiac magnetic resonance imaging(CMR)feature-tracking strain analysis in risk stratification of diabetic heart failure with preserved ejection fraction(HFpEF).Methods:In this retrospective study,a total of 215 patients with diabetic HFpEF who underwent CMR at Chinese Academy of Medical Sciences Fuwai Hospital from January 2012 to December 2018 were included.Myocardial strain parameters were calculated using CMR feature-tracking technology.Patients were followed up by medical records or telephone calls.Composite endpoint event,all-cause death or heart failure hospitalization during follow-up were recorded.Patients were divided into event group and event-free group.Univariable and multivariable Cox proportional hazard regression analyses were performed to determine the risk factors for the outcomes in diabetic HFpEF.The effects of hypertension and obesity on the prognosis of diabetic HFpEF patients and whether they affect the prognostic value of CMR feature-tracking strain analysis were also analyzed.Results:During a follow-up of(7.1±1.8)years,93(43.3%)patients had endpoint events(event group),including 28 all-cause deaths and 65 heart failure hospitalization.Compared with the event-free group(n=122),patients in the event group had significantly lower left ventricular ejection fraction,higher prevalence and extent of late gadolinium enhancement,and significantly reduced global longitudinal strain(GLS),global circumferential strain,global radial strain,and global systolic longitudinal strain rate(all P<0.05).The absolute GLS value was significantly lower in event group than in event-free group,regardless of the presence of hypertension and obesity.Multivariate Cox regression analysis showed that estimated glomerular filtration rate(HR=0.983,95%CI:0.972-0.993,P=0.001),left atrial volume index(HR=1.015,95%CI:1.005-1.026,P=0.004),and GLS(HR=1.142,95%CI:1.060-1.231,P<0.001)were independent risk factors for adverse cardiovascular events in diabetic HFpEF patients.However,adjusted N-terminal pro-brain natriuretic peptide was not an independent prognostic factor.The cut-offvalue of GLS to predict outcome was-14.09%from ROC curve analysis.The Kaplan-Meier curve showed that in patients with and without hypertension and obesity,patients with the GLS>-14.09%had lower event-free survival compared to patients with GLS≤-14.09%(all P<0.05),and the ability of GLS to predict adverse outcomes was not affected by hypertension and obesity.Conclusions:GLS obtained by CMR feature-tracking strain analysis is an independent predictor of adverse outcomes in diabetic HFpEF,and its ability to predict adverse outcomes is independent of hypertension and obesity.

Objective:To investigate the change of cortical activation pattem during wrist extension in health subjects in-duced by neuromuscular electrical stimulation(NMES)and peripheral magnetic stimulation(PMS),using func-tional near infrared spectroscopy(fNIRS).Method:Fifteen health adults received 2 randomly ordered interventions(NMES and PMS),which were applied to the dominant wrist extensor muscle to induce wrist extention.Qxy-hemoglobin(HbO2)and deoxygenated he-moglobin(HbR)were measured in seven regions of interest(ROI)during NMES and PMS stimulation.The difference between these two non-invasive peripheral stimulation on the cortical activation was recorded in the changes of HbO2 and HbR concentrations.Result:During NMES motor phase,HbO2 values of 38 channels in ROI except bilateral S1 region showed a significant decreased compared with the rest period(P＜0.05).The HbO2 values of six channels were significant-ly changed in PMS motor phase,and the activated channels were concentrated on M1 region.The HbO2 val-ues of the left M1 region of hand movement area(channel 35)were higher than other ROI(P＜0.05).The acti-vation of HbO2 in the left M1 hand movement area(channels 23 and 35)was significantly stronger in PMS motor phase than in NMES motor phase(P＜0.05).Based on HbR values,both NMES and PMS activated the same number of channels compared to the rest period.Conclusion:The results showed that NMES induced wrist extension could lead to decreased cortical activation in multiple brain regions,and PMS induced more concentrated and effective cortical activation than NMES.PMS likely via massive inflows of'pure'proprioceptive information.Both PMS and NMES can increase the stimulation of functional activity in parts of muscle-innervated cortex based on changes in HbO2 values,with PMS stimulating cortical functional activity regionally.

Objectives:To investigate the clinical value of cardiac magnetic resonance imaging(CMR)feature-tracking strain analysis in risk stratification of diabetic heart failure with preserved ejection fraction(HFpEF).Methods:In this retrospective study,a total of 215 patients with diabetic HFpEF who underwent CMR at Chinese Academy of Medical Sciences Fuwai Hospital from January 2012 to December 2018 were included.Myocardial strain parameters were calculated using CMR feature-tracking technology.Patients were followed up by medical records or telephone calls.Composite endpoint event,all-cause death or heart failure hospitalization during follow-up were recorded.Patients were divided into event group and event-free group.Univariable and multivariable Cox proportional hazard regression analyses were performed to determine the risk factors for the outcomes in diabetic HFpEF.The effects of hypertension and obesity on the prognosis of diabetic HFpEF patients and whether they affect the prognostic value of CMR feature-tracking strain analysis were also analyzed.Results:During a follow-up of(7.1±1.8)years,93(43.3%)patients had endpoint events(event group),including 28 all-cause deaths and 65 heart failure hospitalization.Compared with the event-free group(n=122),patients in the event group had significantly lower left ventricular ejection fraction,higher prevalence and extent of late gadolinium enhancement,and significantly reduced global longitudinal strain(GLS),global circumferential strain,global radial strain,and global systolic longitudinal strain rate(all P<0.05).The absolute GLS value was significantly lower in event group than in event-free group,regardless of the presence of hypertension and obesity.Multivariate Cox regression analysis showed that estimated glomerular filtration rate(HR=0.983,95%CI:0.972-0.993,P=0.001),left atrial volume index(HR=1.015,95%CI:1.005-1.026,P=0.004),and GLS(HR=1.142,95%CI:1.060-1.231,P<0.001)were independent risk factors for adverse cardiovascular events in diabetic HFpEF patients.However,adjusted N-terminal pro-brain natriuretic peptide was not an independent prognostic factor.The cut-offvalue of GLS to predict outcome was-14.09%from ROC curve analysis.The Kaplan-Meier curve showed that in patients with and without hypertension and obesity,patients with the GLS>-14.09%had lower event-free survival compared to patients with GLS≤-14.09%(all P<0.05),and the ability of GLS to predict adverse outcomes was not affected by hypertension and obesity.Conclusions:GLS obtained by CMR feature-tracking strain analysis is an independent predictor of adverse outcomes in diabetic HFpEF,and its ability to predict adverse outcomes is independent of hypertension and obesity.

Objective:To investigate the change of cortical activation pattem during wrist extension in health subjects in-duced by neuromuscular electrical stimulation(NMES)and peripheral magnetic stimulation(PMS),using func-tional near infrared spectroscopy(fNIRS).Method:Fifteen health adults received 2 randomly ordered interventions(NMES and PMS),which were applied to the dominant wrist extensor muscle to induce wrist extention.Qxy-hemoglobin(HbO2)and deoxygenated he-moglobin(HbR)were measured in seven regions of interest(ROI)during NMES and PMS stimulation.The difference between these two non-invasive peripheral stimulation on the cortical activation was recorded in the changes of HbO2 and HbR concentrations.Result:During NMES motor phase,HbO2 values of 38 channels in ROI except bilateral S1 region showed a significant decreased compared with the rest period(P＜0.05).The HbO2 values of six channels were significant-ly changed in PMS motor phase,and the activated channels were concentrated on M1 region.The HbO2 val-ues of the left M1 region of hand movement area(channel 35)were higher than other ROI(P＜0.05).The acti-vation of HbO2 in the left M1 hand movement area(channels 23 and 35)was significantly stronger in PMS motor phase than in NMES motor phase(P＜0.05).Based on HbR values,both NMES and PMS activated the same number of channels compared to the rest period.Conclusion:The results showed that NMES induced wrist extension could lead to decreased cortical activation in multiple brain regions,and PMS induced more concentrated and effective cortical activation than NMES.PMS likely via massive inflows of'pure'proprioceptive information.Both PMS and NMES can increase the stimulation of functional activity in parts of muscle-innervated cortex based on changes in HbO2 values,with PMS stimulating cortical functional activity regionally.

Objective:To study the effect of repetitive facilitative exercise (RFE) combined with repetitive transcranial magnetic stimulation (rTMS) on upper limb motor function in subacute stroke patients.Methods:A total of 80 patients with subacute stroke diagnosed and treated in the First Affiliated Hospital of Wenzhou Medical University from November 2023 to March 2024 were prospectively selected and divided into control group, RFE group, RFE+ low frequency rTMS group and RFE+ high frequency rTMS group by random number table method, with 20 cases in each group. The control group received conventional rehabilitation therapy, the RFE group received conventional rehabilitation therapy +RFE, the RFE+ low frequency rTMS group received conventional rehabilitation therapy +RFE+ low frequency (1 Hz) rTMS therapy, and the RFE+ high frequency rTMS group received conventional rehabilitation therapy +RFE+ high frequency (10 Hz) rTMS therapy. All of four groups were treated continuously for 2 weeks. The changes of Fugl-Meyer Scale (Motor Function) Upper Limb (FMA-UE) score, Modified Ashworth Scale (MAS) score, Modified Barthel Index (MBI) score, hemiplegic hand grip strength and BrunnstromScale (BRSS) score before and after treatment were compared among the four groups.Results:There were no statistical differences in the FMA-UE score, MAS grade, MBI score and hemiplegic hand grip strength among the four groups before treatment ( P>0.05). After treatment, the FMA-UE, MBI scores and hemiplegic hand grip strength were increased in the four groups, and MAS grade were decreased, there were statistical differences ( P<0.05). RFE+ low-frequency rTMS group had the highest FMA-UE, MBI score and hemiplegic hand grip strength, and MAS grade was the lowest, and compared with RFE+ high-frequency rTMS group, there were statistical differences : (43.65 ± 2.11) scores vs. (40.95 ± 2.12) scores, (49.20 ± 4.06) scores vs. (44.80 ± 2.48) scores, (32.45 ± 2.59) kg vs. (29.30 ± 2.94) kg, (0.37 ± 0.09) grade vs. (0.56 ± 0.10) grade, P<0.01. The BRSS unupgradingrate among the four groups after treatment were 10/20, 8/20, 2/20, 5/20, there was statistical difference ( χ2 = 8.65, P = 0.031), and the RFE+ low-frequency rTMS group had the lowest number of BRSS unupgraded cases. Conclusions:The efficacy of RFE combined with low-frequency rTMS in the treatment of subacute stroke is obvious, which is conducive to promoting the recovery of muscle strength, grip strength and motor function of the hemiplegic side of the patients.

The appearance and degree of damage caused by metallic mercury injection at different sites were disparate, and different from common mercury poisoning. This study reviewed literature on poisoning caused by injection of metallic mercury in different body parts, summarized the health impairments and corresponding treatment principles. The causes of such accidents were mostly intentional injury or suicide, self-harm, with a minority due to feudal superstition, tattoos, and improper treatment. Subcutaneous or deep intramuscular injection of mercury primarily caused local inflammation reactions in the early stages. Intraocular injection might lead to inflammation, tissue necrosis, and blindness. Intravenous injection might lead to local or systemic acute reactions. The injection at local sites might cause harms to respiratory, nervous, urinary, and circulatory systems and reproductive health if individuals fail to boost mercury excretion promptly. For mercury treatment, the vacuum sealing drainage and extensive removal of deposits were preferred for mercury subcutaneous, muscular, or deep tissue injected individuals. For mercury intraocular injected individuals, the prompt surgical removal of mercury drops and, if necessary, enucleation of the eyeball were preferred. For mercury intravenous injected individuals, in addition to debridement surgery, treatment such as plasma exchange, hemoperfusion, hemodialysis, and bronchoalveolar lavage could be used. For mercury poisoning caused by injection in different body parts, mercury expulsion and symptomatic treatment are recommended, in addition to psychological therapy.