Efficacy and hypnotic effects of melatonin in shift-work nurses: double-blind, placebo-controlled crossover trial

<p>Abstract</p> <p>Background</p> <p>Night work is associated with disturbed sleep and wakefulness, particularly in relation to the night shift. Circadian rhythm sleep disorders are characterized by complaints of insomnia and excessive daytime sleepiness that are primarily due to alterations in the internal circadian timing system or a misalignment between the timing of sleep and the 24-h social and physical environment.</p> <p>Methods</p> <p>We evaluated the effect of oral intake of 5 mg melatonin taken 30 minutes before night time sleep on insomnia parameters as well as subjective sleep onset latency, number of awakenings, and duration of sleep. A double-blind, randomized, placebo-controlled crossover study with periods of 1 night and washouts of 4 days comparing melatonin with placebo tablets was conducted. We tried to improve night-time sleep during recovery from night work. Participants were 86 shift-worker nurses aged 24 to 46 years. Each participant completed a questionnaire immediately after awakening.</p> <p>Results</p> <p>Sleep onset latency was significantly reduced while subjects were taking melatonin as compared with both placebo and baseline. There was no evidence that melatonin altered total sleep time (as compared with baseline total sleep time). No adverse effects of melatonin were noted during the treatment period.</p> <p>Conclusion</p> <p>Melatonin may be an effective treatment for shift workers with difficulty falling asleep.</p

Transcranial Direct Current Stimulation (tDCS) as a Therapeutic Tool for Chronic Insomnia

Background and Objective: Insomnia is the most common sleep problem which is associated with cortical over-excitation. Transcranial direct-current stimulation (tDCS) potentially modifies insomnia-related cortical state. There-fore, we tested the hypothesis that insomnia severity can be modulated by tDCS. Materials and Methods: The current study was conducted with a pretest-posttest design and a control group. A total of 32 women with insomnia were randomly categorized into an intervention group (active stimulation) and a control group (sham stimulation). In the intervention group, tDCS was used with an intensity of 2mA for 20 to 30 minutes during 12 sessions (3 times a week). Anodal stimulation was performed on the left primary motor cortex (M1) and cathodal stimulation was performed on the right dorsal lateral prefrontal cortex (DLPFC). The control group received sham stim-ulation for 20 to 30 minutes during 12 sessions (3 times a week). All participants were evaluated before and after the intervention using the Insomnia Severity Index (ISI) and Positive Affect and Negative Affect Schedule (PANAS). Results: The results of univariate analysis of covariance (ANCOVA) and multivariate analysis of covariance (MANCOVA) showed a significant difference between the tDCS group and the sham group in terms of reduction in the severity of insomnia. We also observed that positive affect increased and negative affect decreased following insomnia treatment (P ≤ 0.005). Conclusion: The results of our study indicated that performing our designed tDCS protocol for treating insomnia can be effective in treating insomnia and improving positive and negative affect

Positive Perspectives of the Predicament of COVID-19

Although crises such as pandemic can inflict cascading disasters on a health care system, they can provide opportunities for the emergence of new types of potential and their optimal use and manifesting the best kinds of altruism and philanthropy. The COVID-19 crisis will undoubtedly entail great costs that are both economically and emotionally irretrievable; nevertheless, the present study seeks to highlight the new opportunities that are provided during this disaster and the optimal utilization of all capacities to alleviate this seemingly-terrible condition. This paper presents a brief report of the first weeks of the COVID-19 crisis in Imam Khomeini Hospital Complex (IKHC) affiliated to Tehran University of Medical Sciences as the largest hospital in Iran with approximately 1200 active beds. In addition to lots of problems during the battle for maintaining the treatment quality in this crisis, a strategy was devised to mitigate the challenges. The positive perspectives during the fight with the predicament of COVID-19 in this hospital are detailed in the following nine domains

Positive Perspectives of the Predicament of COVID-19

Although crises such as pandemic can inflict cascading disasters on a health care system, they can provide opportunities for the emergence of new types of potential and their optimal use and manifesting the best kinds of altruism and philanthropy. The COVID-19 crisis will undoubtedly entail great costs that are both economically and emotionally irretrievable; nevertheless, the present study seeks to highlight the new opportunities that are provided during this disaster and the optimal utilization of all capacities to alleviate this seemingly-terrible condition. This paper presents a brief report of the first weeks of the COVID-19 crisis in Imam Khomeini Hospital Complex (IKHC) affiliated to Tehran University of Medical Sciences as the largest hospital in Iran with approximately 1200 active beds. In addition to lots of problems during the battle for maintaining the treatment quality in this crisis, a strategy was devised to mitigate the challenges. The positive perspectives during the fight with the predicament of COVID-19 in this hospital are detailed in the following nine domains

The effects of CPAP therapy on metabolic profile and subjective sleep parameters in patients with OSA: a prospective trial study

Objective: Several studies confirmed a positive association between obstructive sleep apnea (OSA) and metabolic syndrome. Continuous positive airway pressure (CPAP) is the main treatment for patients with moderate and severe OSA. CPAP therapy in adults with OSA results in reduction in sleepiness, blood pressure and improvement of metabolic profile. In this study, we aimed to evaluate the effects of CPAP therapy on various components of metabolic syndrome and subjective sleep parameters in patients with OSA. Material and Methods: In this prospective trial study, 28 patients with moderate and severe OSA enrolled. Patients were asked to fill out the validated Persian version of questionnaires including Epworth sleepiness scale, insomnia severity index, STOP-BANG and Beck depression inventory - II, before and after treatment with CPAP. Weight and blood pressure were recorded before and after treatment. Only 14 patients agreed to blood sampling before and after CPAP therapy (at least 3 months of treatment). Fasting blood samples were analyzed for measuring the levels of FBS (fasting blood sugar), TG (triglyceride), total cholesterol, HDL, LDL, AST, and ALT. Results: Diastolic blood pressure, ISI and STOP-BANG score significantly decreased after treatment (p-value: 0.008, 0.022 and 0.004, respectively). FBS and TG levels decreased after treatment, but only TG levels had significant difference (p-value: 0.46 and 0.016, respectively). Discussion: CPAP therapy had positive effects on diastolic blood pressure, TG levels and ISI score. More studies with larger sample size and longer follow-up periods are warranted to investigate the effects of CPAP therapy on blood pressure, and metabolic parameters

Workforce and Employment Status of Sleep Medicine Graduates in Iran

Background and Objective: Sleep medicine is a multidisciplinary specialty that focuses on diagnosing and treating sleep disorders. Sleep medicine fellowship programs in Iran commenced in 2012 at Tehran University of Medical Sciences, Tehran, Iran. This study aimed to investigate the human resources and employment status of sleep medicine fellowship graduates in Iran. Materials and Methods: This study was a descriptive cross-sectional study conducted in Iran in 2022 using conven-ience sampling and included 41 sleep medicine fellows in Iran. Data collection tools included a demographic question-naire and a researcher-made survey. Data were analyzed using the SPSS software. Results: Out of 57 sleep medicine fellows, 41 individuals with an average age of 44.95 ± 7.57 years participated in the study. Only 12% of the fellows were satisfied with their income, and all participants expressed dissatisfaction with their insurance coverage. 92% considered the existence of a national guideline for sleep medicine to be crucial, while 66.7% felt the curriculum of medical sleep medicine had some deficiencies. Conclusion: Lack of a suitable national guideline for treating and preventing sleep disorders, lack of insurance coverage for tests and respiratory assist devices, and high costs of establishing and equipping specialized sleep clinics are major challenges recognized by sleep medicine fellows. Additionally, due to the low priority given to these diseases by authorities and the inappropriate distribution of sleep medicine specialists in the country, access to appropriate treatment for sleep disorders is only feasible in giant cities

Obstructive sleep apnea and severity of coronary artery disease

Background: It has been implicated that obstructive sleep apnea (OSA) is associated with increased risk of cardiovascular disease including stroke, myocardial infarction, coronary artery disease (CAD) and hypertension. The aim of this study was to investigate the correlation between OSA and severity of atherosclerosis assessed by angiography. Methods: This study included 337 patients undergoing diagnostic coronary angiography at Tehran Heart Center, Iran. The Gensini score was obtained from each patient for coronary angiogram, and OSA were assessed by using Multivariable apnea prediction (MAP) risk index on the day of cardiac catheterization. The Gensini scores increased in accordance with increases in the MAP value. Results: The prevalence rates of three-vessel disease were 68.0% in OSA group and 32.0% in non-OSA group. The MAP index was the most significant independent determinant for the Gensini score. Conclusions: The independent association between OSA and CAD, even after adjustment for traditional confounders, suggests that, OSA should be taken into account when considering risk factors for CAD

Fatigue management in the workplace

Fatigue management in the workplace Khosro Sadeghniiat-Haghighi1, Zohreh Yazdi2 Abstract Workers' fatigue is a significant problem in modern industry, largely because of high demand jobs, long duty periods, disruption of circadian rhythms, and accumulative sleep debt that are common in many industries. Fatigue is the end result of integration of multiple factors such as time awake, time of day, and workload. Then, the full understanding of circadian biologic clock, dynamics of transient and cumulative sleep loss, and recovery is required for effective management of workplace fatigue. It can be more investigated in a new field of sleep medicine called occupational sleep medicine. Occupational sleep medicine is concerned with maintaining best productivity and safety in the industrial settings. The fatigue risk management system (FRMS) is a comprehensive approach that is based on applying scientific evidence of sleep knowledge to manage workers fatigue. It is developing rapidly in the highly safety demand jobs; especially truck drivers, pilots, and power plant workers. The objective of this review is to explain about fatigue in the workplace with emphasis on its association work performance and errors/accidents. Also, we discussed about different methods of fatigue measurement and management. Keywords: Fatigue management, safety, workplac

Comparison of Two Assessment Tools That Measure Insomnia: The Insomnia Severity Index and Polysomnography

Background: Insomnia is a common sleep disorder, characterized by difficulties in sleep initiation, sleep maintenance or early morning awakening. Although polysomnography (PSG) is a standard method in the evaluation of sleep disorders, it is not recommended for routine use in the clinical assessment of insomnia. Instead, standard questionnaires could be used in the primary evaluation of insomnia. Objective: The main object of this study was to compare the type and severity of patients′ subjective complaints of insomnia gathered from insomnia severity index (ISI) questionnaire with the result of their polysomnographic evaluation. Materials and Methods: In this cross-sectional study conducted during 2010-2011 in Iran, all patients in one clinic with sleep disorders were evaluated. The study consisted of self-administered questionnaires completed by participants to provide information on demographic characteristics and ISI questionnaire. After completing the questionnaire, all the participants underwent standard overnight PSG. Results: Subjects were 151 patients (47.2 ± 10.8 years old). The average ISS was 6.1 ± 4. There was a significant relationship between the subjective complaint of difficulty in sleep initiation and sleep onset latency in PSG (r = 0.5, P < 0.001). Furthermore, there was a correlation between the subjective complaint of difficulty in sleep maintenance and number of awakening in PSG (r = 0.19, P = 0.01). A low patients′ satisfaction from their sleep was associated with lower total sleep time (r = -0.2, P = 0.02) and a lower percentage of rapid eye movement (REM) sleep in their PSG study (r = -0.25, P = 0.002). No relation was found between patients′ satisfaction and sleep efficiency measured with PSG (r = -0.04, P = 0.6). Conclusions: Our findings suggest that objective insomnia, measured with ISI, is related with PSG variables and ISI could be a useful tool to quantify perceived insomnia severity. Further studies are needed to determine the sensitivity and specificity of this questionnaire

Cross-Shift Study of Acute Respiratory Effects in Cement Production Workers

Cement dust exposure is associated with increased respiratory impairment. As the major occupational hazard in the cement production industry is cement particles, our aim was to more thoroughly examine the acute effects of occupational exposure to cement dust on the respiratory system. A cross-shift study was conducted in a cement factory in Iran. 100 high exposed workers from production and packing sections and 100 low exposed from office workers were included. Environmental total dust was measured in each section. Assessment of lung function was done by pre and post shift spirometry. At the end of the day shift, acute respiratory symptoms were recorded. The means of total dust among high and low exposed workers were 16.55 mg/m3 and 0.9 mg/m3, respectively. The most common acute respiratory symptoms in high exposed workers were stuffy nose (52%) and shortness of breath (49%). A statistically significant post shift reduction in PEF, FEV1, FEF 25-75, FVC and FEV1/ FVC was demonstrated in high exposed group. Multivariate linear regression showed a significant relationship between the percentage of the cross-shift decrease in spirometric indices and exposure to cement dust. We detected significant relationship between exposure to cement dust and acute respiratory symptoms and pulmonary function indices. Effective dust-control measures and preparing a suitable strategy for respiratory protection are highly recommended