Tibbi-i-kar

---

Background: One of the most main jobs in the automotive industries is assembly that its activities include hand motions, navigation of pieces and using controlled forces for joining of them together. Awkward posture is one of the most important risk factors in incidence of musculoskeletal disorders. There are different methods to assess those factors. This study was conducted to illustrate the correlation between the results of MFA method and RULA in the assessment of musculoskeletal disorders risk. Methods: In this cross-sectional study 37 jobs were selected as a sample by using of Cochran formula. In this study, 80 postures were assessed by using of two mentioned methods to determine the musculoskeletal risk level. Results: The results of MFA method indicated that 17.5%, 11.3% and 7.5% of jobs in shoulders, low back, wrist and fingers were sequentially in “very high” level of modified actions preference. On the other hand, the results of RULA assessment pointed out that 46.3% of jobs were in level 3 of modified actions and 38.8 of them were in level 3 of those actions. Analyzing of data by using of Spearman test displayed that there is significant relationship between RULA scores of shoulders, body and neck with the level of modified action in MFA method (P-value≤0.05) and sequentially, the correlation coefficients were 0.782, 0.787 and 0.8. Conclusion: In general view, there are many similarities between two methods in both the way of study and the final assessment however, one of the main differences of them is that the results of MFA method are more reliable when all parts of body involve in physical activities. In addition, in MFA method, the details of body’s limbs are assessed more than RULA method.

---

Introduction: Extremely low frequency magnetic field is a part of electromagnetic spectrum with frequency range from 30-300 Hz, which effects on the mental and physical health. In the current conditions, some of the labor affairs authorities believe that psychological problems are the main problem among the workers. The present study was designed to assess general health and depression in workers who are exposed to these fields.

Methods: This is a case-control study. In order to evaluate the exposure of these two groups, magnetic flux density with extremely low frequency was measured with TES-1394 device in workplace and staff commuter. Beck Depression Inventory and General Health Questionnaires were used to assess general health status and depression.

Results: There are significant differences between the case and control groups in terms of public health (p<0.003) and depression (p=0.031). 60% of the workers who were exposed to these magnetic fields were suspected to the general health problems and 68% of these were reported different degrees of depression (mild 20%, moderate 30%, severe 10%).

Conclusion: General health and depression among the workers who were exposed to magnetic fields had a significant difference compared with the control group. Lower general health and higher rates of depression were seen in the case group. According to the previous studies, analysis and interpreting of the effects of these magnetic fields on the outbreak of depressive symptoms were difficult and this was because of the different results from different studies.

---

Introduction: driving is such a complex cognitive task that requires a high level of vigilance and response to an emergency. Anything that leads to cognitive performance degradation in the driver's mental processing, increases crash risks. Traffic noise as one of the most destructive elements of cognitive function was examined in this study.

Methods: In this study, the sample consisted of 80 patients (40 cases and 40 controls) who were students of Tehran University of medical sciences that were selected through systematic sampling and then the average sound pressure level recorded traffic noise was played for participants in the acoustics room. To Measure reaction time and error in time movement anticipation, the RT and ZBA softwares were used ,respectively.

Results: The results revealed that reaction time increased significantly after exposure to traffic noise. The error time movement after exposure to traffic noise has not significant difference.

Conlusions: According to the results it can be concluded that mental activities such as speed and power of information processing are affected by traffic noise and in a confrontation with traffic noise show different changes.

---

Introduction: One of the pollutants that is developing in human life day by day is Magnetic field. In modern urban transport systems, diesel motors have been replaced with electric motors, working with alternating and direct currents, and leading to occupational exposure of drivers with magnetic fields. This study aimed to determine the urban train's drivers exposure with static magnetic fields and compare it with national occupational exposure limits.

Methods: In order to measure the train's drivers exposured with static magnetic field, several samples were selected from urban AC and DC and AC intercity trains, in the 1,2,4, and 5 lines of Tehran, Iran. After determination of the sampling location, static magnetic field was measured by three axes magnetic field meter (HI-3550), according to the standard IEEE std C95.3.1 and previous studies. In order to analyze the data, SPSS software (ver. 20) was used.

Results: The maximum exposure of drivers was in DC trains- line 2- (0.52 mT), meanwhile, average exposure of AC trains driver (0.095 mT) was higher than DC trains driver (0.081 mT). The average magnetic flux density between different lines has not have significant differences. The highest levels of time-weighted average exposure were related to line 1 AC train drivers (0.06 mT).

Conclusion: Exposure of train’s drivers was 10 time higher than background level, indicating a significant exposure in this job. However, in none of the assessment situation, the whole body exposure of train’s drivers was not exceeded from National Occupational Exposure Level (TWA= 0.2 and ceiling= 2 T). Of course, it does not imply that this level of exposure is completely safe, because different studies have reported health problems even at lower values of the magnetic field.

---

ntroduction: In all over the world, one of the major problems in health care is medical errors, causing physical and psychological complications for patients, family and even the community. So, identification and assessment of human errors’ probability and their consequences in eye surgeries was the aim of this study.
Methods: This cross-sectional study was performed using PHEA technique. First, the goals and results of the research were fully explained to the surgeons and the operating room personnel, then, thorough direct observations of various eye surgeries, based on the analytical hierarchy technique (HTA), documentary registrations and interviews with the subjects were done; the hierarchical chart of the personnel and surgeons occupational tasks were arranged. Then, the standard worksheets for the PHEA technique filled out by the research team.
Results: Generally, 68 tasks and 187 sub tasks were identified and probable human error for them was 58%. A total of 132 error codes, including functional errors (67.42%), checking errors (14.39%), retrieval errors (5.31%), selection errors (9.1%), and communication errors (3.78%) were identified; any program error code was not detected. The highest percentage of errors was related to performance errors and the least to communication and program errors.
Conclusion: Results show that in many of studies on medical errors, as well as the present one, the incidence of human errors in eye surgery is high and in some cases there are very unpleasant consequences; and since, the most detected errors are of functional type. So, it should be prioritized in order to control and reduce medical errors.
 

---

Introduction: Shift work is one of the social phenomena that has its roots in the history of human origin and still exists today for economic and technological reasons. Due to the complications of shift work, the present study was conducted to investigate job fatigue, quality of life, and sleep of shift staff working in Ilam Electric Distribution Company.
Materials and Methods: In this descriptive-analytical study, all shift workers of Ilam Electric Distribution Company were selected. Data collection tools included the Swedish Job Exhaustion Questionnaire, Quality of Life (SF-36), the Insomnia Assessment Questionnaire, and the Survey of shift workers (SOS). SPSS software version 26 was used to analyze data using independent sample T-Test, One-way ANOVA, and Chi-square tests. 
Results: Pearson correlation test showed that there was a direct and positive correlation between age and physical function (r = 0.439; p = 0.022), smoking and sleep problems (r = 0.528; p = 0.006), and education and limitation of the role of emotional problems (r = 0.382; p = 0.049). Also, the was a significant indirect correlation was found between age and physical role limitation (r = - 0.501; p = 0.008), shift work with satisfaction with individual life (p <0.045), social life (p <0.038), family life (p <0.023) and family dissatisfaction.
Conclusion: shift working has adverse effects on family satisfaction, circadian rhythms, digestive performance, and mental health. It is suggested that managers be more careful about working hours, work shifts, and rest times.