Association between mitochondrial DNA content and opium exposure.

To date, not much study has been done to investigate the mitochondrial DNA (mtDNA) copy number as the potential biomarker for opium exposure. Here, we conducted a cross-sectional study to determine the relative mtDNA content as the potential biomarker for opium exposure. Quantitative real-time PCR was performed to investigate the mtDNA copy number variation across 205 individuals, including blood samples of 45 opium users, 41 cigarette users, 47 dual users, and 72 never users of any product. We found a significantly higher mtDNA content among the opium-only users (adjusted OR: 3.21; 95% CI: [1.34, 7.66]; P = .009) and dual users (adjusted OR: 2.64; 95% CI: [1.15, 6.1]; P = .02) compared to that in never users even after adjustment for confounding factors, age, and sex. Discordantly, analysis of mitochondrial DNA in cigarette smokers revealed an indirect association between cigarette smoking and mtDNA content although it was not statistically significant. The reason behind the increased mitochondrial DNA is unclear. The possible hypothesis is that there might be a way to compensate for the oxidative damage induced by opium consumption. Taken together, our findings indicated that the mtDNA copy number may alter during opium exposure. Since changes in the mitochondrial DNA copy number was associated with the etiology of many diseases including cancer, further investigations on the mtDNA copy number may shed light on the carcinogenicity of opium consumption and means for early detection among the populations who have been exposed to opium and its products.

Association of exposure to air pollution and green space with ovarian reserve hormones levels.

Exposure to air pollution has been associated with adverse health effects while exposure to greenspace has been associated with public health benefits. However, the available evidence on the association of exposure to air pollution with ovarian reserve markers is still scarce, with no study on such an association with greenspace exposure. Therefore, this study aimed to investigate the association of exposure to particulate matter with diameter of less than 1, 2.5 and 10 µm (PM1, PM2.5, PM10), traffic indicators (distance from women's residence to major roads and total street length in different buffers around women's residential address) and greenspace indicators (residential surrounding greenspace and distance to green spaces) with serum levels of anti-müllerian hormone (AMH) and follicle stimulating hormone (FSH) as markers of ovarian reserve. This cross-sectional study was based on 67 women residing in Sabzevar, Iran (2018). Basal serum levels of FSH and AMH were measured by the enzyme-linked immunosorbent assays (ELISA). Land use regression models were used to estimate PMs concentrations at residential addresses and the average of normalized difference vegetation index (NDVI) in different buffers was used to characterize residential surrounding greenspace. Multiple linear regression models were developed to estimate the association of AMH and FSH with exposure to air pollution, traffic, and greenspace (one at a time) controlled for relevant covariates. In fully adjusted models, there was an inverse association between exposure to PM1, PM2.5 as well as total street length in 100 m buffer around women's residence and AMH level (ß = -0.89, 95% confidence interval (CI): -1.43, -0.35, P-value ≤ 0.01, ß = -1.11, 95% CI: -1.67, -0.55, P-value ≤ 0.01 and ß = -0.76, 95% CI: -1.48, -0.50, P-value = 0.03, respectively). Moreover, increase in distance from home to nearest major road as well as residential surrounding greenspace (100 m buffer) and decrease in residential distance to a green space larger than 5000 m2 were associated with increase in serum level of AMH. However, we did not observe any significant association between exposure to air pollution, traffic, and greenspace with FSH level. Overall, our findings supported a beneficial association of exposure to greenspace and detrimental association of exposure to air pollution with ovarian reserve.

Comparison of the efficacy of sublingual, oral, and vaginal administration of misoprostol in the medical treatment of missed abortion during first trimester of pregnancy: A randomized clinical trial study.

BACKGROUND: This study was aimed at comparing the efficacy of different routes of misoprostol administration, including sublingual, oral, and vaginal, on the induction of medical abortion in the first trimester of pregnancy. MATERIALS AND METHODS: This open-label, randomized clinical trial study was performed on 172 individuals in three parallel groups of vaginal, sublingual, and oral administration of misoprostol. The participants were randomized using permuted blocks of six. A dose of 600 µg of misoprostol every 6 h (maximum of 4 doses) was administrated to each group. Higham chart and demographic questionnaires were completed by the investigator. Data were analyzed using Stata software version 12. RESULTS: The mean age of the participants was 29.81 ± 6.7 years, and the mean gestational age was 8.45 ± 2.32 weeks. We found a significant difference regarding the abortion success rate and the time interval between the administration of the drug among three groups (P = 0.036 and < 0.001 in turn). There was no statistically significant difference between the three groups in terms of severity and duration of vaginal bleeding until day 7 after induction (P = 0.091 and 0.143, respectively). Furthermore, we found statistically significant differences in some drugs, which induced side effects namely vomiting and headache, between the three groups (P = 0.032 and 0.028 in turn). CONCLUSION: The findings suggest that vaginal administration of misoprostol is more successful than the sublingual and oral route for complete abortion; vaginal administration of misoprostol is an appropriate alternative to curettage.

Higher incidence of premenopausal breast cancer in less developed countries; myth or truth?

BACKGROUND: Fundamental etiologic differences have been suggested to cause earlier onset of breast cancer in less developed countries (LDCs) than in more developed countries (MDCs). We explored this hypothesis using world-wide breast cancer incidence data. METHODS: We compared international age-standardized incidence rates (ASR) of pre- (<50 years) and postmenopausal (≥50 years) breast cancers as well as temporal trends in ASRs of pre-and postmenopausal breast cancer among selected countries during 1975-2008. We used joinpoint log-linear regression analysis to estimate annual percent changes (APC) for premenopausal and postmenopausal breast cancer in the northern Europe and in Black and White women population in the US. RESULTS: Premenopausal breast cancers comprised a substantially higher proportion of all incident breast cancers in LDCs (average 47.3%) compared to MDCs (average 18.5%). However, the ASR of premenopausal breast cancer was consistently higher in MDCs (29.4/100,000) than LDCs (12.8/100,000). The ASR of postmenopausal cancer was about five-fold higher in the MDCs (307.6/100,000) than the LDCs (65.4/100,000). The APC of breast cancer in Denmark was substantially higher in postmenopausal (1.33%) than premenopausal cancer (0.98%). Higher incidence of breast cancer among the white than black women in the US was pertained only to the postmenopausal cancer. CONCLUSION: The substantial and consistent lower age-specific incidence of breast cancer in LDCs than in MDCs contradicts the theory of earlier onset. Demographic differences with fewer old women in LDCs and lower prevalence of risk factors of postmenopausal cancer are the most likely explanation to the lower mean age at diagnosis in these countries.

Determination of toxic metal burden and related risk factors in pregnant women: a biological monitoring in Sabzevar, Iran.

Nowadays, the adverse effect of toxic metals on humans is well known, especially in the fetal period such as preventing cognitive development and congenital abnormalities of the central nervous system. Hence, this study aims to evaluate the toxic metal burden in mothers and newborns in Sabzevar. Obtained data can be useful for authorities in public health issues. To determine heavy metals in placental blood and umbilical cord blood, one hundred eighty blood samples were taken from ninety mothers referred to Shahidan Mobini Hospital for delivery. The amount of metals in samples was analyzed using inductively coupled plasma optical emission spectrometry (ICP OES). The results of this study revealed that 21.52%, 26.19%, and 60.71% of maternal blood samples (placental blood) and 16.47%, 56.47%, and 20% of umbilical cord blood samples were higher than the US center for disease control (CDC) recommended levels for Pb, Cd, and As respectively. According to the multiple linear regression analysis, the Pb (p = 0.054), As (p < 0.001), and Se (p < 0.001) levels had an association with the mother's living area. Also, there was a significant association between Se (0.021) and the age of the mother. However, the Se values in its optimum concentrations in the blood (60-140 µg/L) can decrease the adverse effects of toxic metals, 72.5% of the pregnant women had Se values below the 60 µg/L and only 6% of pregnant women had Se levels higher than 140 µg/L. We concluded that the mothers inhabiting the rural areas need more Se sources in their diets.

Helicobacter pylori acquisition rates and the associated risk factors amongst newlywed couples; a prospective cohort study in Tehran, Iran.

BACKGROUND: The rates and routes of Helicobacter pylori transmission, in a high-prevalent country like Iran, with gastric cancer as the leading cause of male cancer mortality, are of great essence. Here, we have studied the H. pylori-associated risk factors and the likelihood of interspousal transmission. METHODS: In a cohort of 686 young prewed couples, questionnaires were self-administered and serum samples were collected, for assessment of risk factors and H. pylori serostatus, at baseline and follow-up. Of the 475 H. pylori single- or double-seronegative couples, 201 returned for follow-up. The average follow-up duration was 2.2 (SD 0.6) years, with a total of 560.1 person-years. Logistic regression and Cox regression models were used to estimate the odds ratios (ORs) and hazard ratios (HRs). RESULTS: The risk of infection was higher in men than women (OR: 1.3, 95% CI: 1.0-1.8) and among metropolitan than rural residents (OR = 1.4, 95% CI: 1.1-1.9). It was also significantly higher among those with three (OR = 1.6, 95% CI: 1.1-2.2), and four or more siblings (OR = 1.4, 95% CI: 1.0-1.9), in reference to those with one or no siblings. Adult H. pylori acquisition occurred in 10.9% (27/247) of the seronegative participants. The risk of the acquisition was significantly associated with age (P value for trend=0,000). It was also significantly lower among participants who had various degrees of education as compared to illiterate subjects (HR = 0.2, 95% CI: 0.1-0.9). Nevertheless, our analysis did not find any evidence for interspousal transmission (HR = 1.0, 95% CI: 0.4-2.2). CONCLUSION: Whilst H. pylori acquisition was detected in the young adult Iranian population, our findings did not support interspousal transmission, as a mode of acquisition.

Moral Distress and its Influential Factors in the Nurses of the Nursing Homes in Khorasan Provinces in 2019: A Descriptive-Correlational Study.

BACKGROUND: Nurses in nursing homes are constantly faced with various moral decisions in terms of elderly care, which in turn causes moral distress. This study aimed to evaluate the moral distress status and its influential factors in the nursing homes in Khorasan provinces, Iran. MATERIALS AND METHODS: This descriptive-correlational study was conducted on 227 nurses engaged in the nursing homes of Khorasan provinces in 2019. The subjects were selected via census sampling. Data were collected using demographic, occupational, and care center characteristics questionnaire and a moral distress questionnaire. Data analysis was performed in SPSS version 16 using the Mann-Whitney U and Kruskal-Wallis test. RESULTS: The mean (SD) score of moral distress was 28.68 (19.19), and 93.83% of the subjects reported low levels of moral distress. Significant correlations were observed between moral distress and age, work experience, workplace, nurse-physician relations, motivation of the nurses, care facilities, and medical equipment. Furthermore, the highest mean (SD) score of moral distress belonged to the items regarding the lack of work experience 12.19 (3.12). CONCLUSIONS: According to the results, moral distress in the nurses of the studied nursing home was relatively low. Despite the favorable outcome of the study, the age discrimination of nurses by nursing homes should not be overlooked.

Biomonitoring of maternal and fetal exposure to mercury in Sabzevar and its affecting risk factors.

Fetuses and young children are sensitive to even low levels of exposure to Hg, which can damage their brain and adversely affect their central nervous system and cognitive development. This study was conducted to determine the maternal and fetal mercury burden levels in mothers presenting to Shahidan Mobini Hospital for delivery. Eighty-nine mothers were included in this study and 360 samples were taken from their placental tissue and blood (maternal blood) as well as their umbilical cord tissue blood (infant blood). Findings revealed a significant strong correlation (r = 0.890, p < 0.001) in blood mercury between mothers and their infants. According to multiple linear regression analysis, there was a significant positive association between living in rural areas and the level of mercury in the placental tissue (ß = 11.09, p < 0.001). This positive association was also found in other samples. In addition, there was a significant association between maternal age and mercury level in the placental tissue (ß = 5.56, p = 0.049), placental blood (ß = 11.67, p = 0.003), umbilical cord tissue (ß = 8.33, p = 0.004) and umbilical cord blood (ß = 9.51, p < 0.001).

Accuracy of Five Multiple Imputation Methods in Estimating Prevalence of Type 2 Diabetes based on STEPS Surveys.

BACKGROUND: This study was aimed to evaluate five Multiple Imputation (MI) methods in the context of STEP-wise Approach to Surveillance (STEPS) surveys. METHODS: We selected a complete subsample of STEPS survey data set and devised an experimental design consisted of 45 states (3 × 3 × 5), which differed by rate of simulated missing data, variable transformation, and MI method. In each state, the process of simulation of missing data and then MI were repeated 50 times. Evaluation was based on Relative Bias (RB) as well as five other measurements that were averaged over 50 repetitions. RESULTS: In estimation of mean, Predictive Mean Matching (PMM) and Multiple Imputation by Chained Equation (MICE) could compensate for the nonresponse bias. Ln and Box-Cox (BC) transformation should be applied when the nonresponse rate reaches 40% and 60%, respectively. In estimation of proportion, PMM, MICE, bootstrap expectation maximization algorithm (BEM), and linear regression accompanied by BC transformation could correct for the nonresponse bias. Our findings show that even with 60% of nonresponse rate some of the MI methods could satisfactorily result in estimates with negligible RB. CONCLUSION: Decision on MI method and variable transformation should be taken with caution. It is not possible to regard one method as totally the worst or the best and each method could outperform the others if it is applied in its right situation. Even in a certain situation, one method could be the best in terms of validity but the other method could be the best in terms of precision.

Effectiveness of Tragacanth Gel Cushions in Prevention of Pressure Ulcer in Traumatic Patients: a Randomized Controlled Trial.

Introduction: Introduction: Pressure ulcer is one of the most common and painful complications in patients admitted to intensive care units (ICUs). This study aimed to compare the effects of tragacanth gel cushions and foam-filled ones on the prevention of pressure ulcers. Methods: This triple-blind, randomized, clinical trial was performed on 94 patients admitted to the ICU of Taleqhani Hospital of Mashhad, Iran. The participants were divided into two groups of tragacanth gel pad and foam (n=47 for each group). Both groups received all the routine care. The participants were examined on a daily basis during a ten-day period. We considered sacral region as the most affected site, and the patients with erythema were excluded from the study. To analyze the data, Chi-squared test, Fisher's exact test, and t-test were run, using Stata version 12. Results: The data showed significant differences in terms of the incidence of skin redness in the tragacanth gel cushions group and foam cushion group, respectively, 6.84 (1.58) and 5.67 (1.26) days after admission. In addition, in the tragacanth gel cushions group 14 patients (29.7%) did not have skin redness compared with the foam cushion group (8.51%), which indicated a significant difference. Conclusion: This study showed that the use of tragacanth gel cushion is effective in the prevention of pressure ulcers in ICU patients. Cushions filled with tragacanth gel also delayed the onset of erythema. Considering their cost-effectiveness and naturalness, the use of tragacanth gel cushions is recommended to improve the sacral skin health and prevent pressure ulcers.

Comparison of skin traction, pressure, and rapid muscle release with conventional method on intramuscular injection pain: A randomized clinical trial.

BACKGROUND: Intramuscular (IM) injection is one of the causes of anxiety and pain in patients, using new techniques and creating a pleasant experience is of the legal and ethical duties of nurses. We aimed to investigate comparison of skin traction, pressure, and rapid muscle release with conventional method on IM injection pain. MATERIALS AND METHODS: This clinical trial investigated 28 patients (56 samples) who required Methocarbamol injection. Two 5 cc Methocarbamol were injected for each patient by the conventional and innovative methods. In the innovative technique, after applying skin traction and imposing deep pressure to the muscle, the needle was inserted at a 90° in the muscle and injected after aspiration. However, this deep pressure was not applied in the conventional method. The pain was measured using visual analog scale. STATA software version 12 was used for statically analysis. P < 0.05 was considered statistically significant. RESULTS: The findings showed pain intensity in innovative method and conventional method was 1.17 ± 0.75 and 2.78 ± 1.61, respectively. The difference was statistically significant (P = 0.001). The minimum pain intensity in innovative method was 0 and maximum was 4, meanwhile in conventional injection, the lowest and highest pain intensity was 0 and 6 respectively. CONCLUSION: The results of this study showed that innovative method can be used as a substitute for conventional method to reduce IM injection pain.

Obesity Should Not Prevent from TRAM Flap Breast Reconstruction in Developing Countries.

Transverse rectus abdominis musculocutaneous (TRAM) flap is the most common procedure performed for breast reconstruction after mastectomy for breast cancer. Obesity is a relative contraindication, and complex modifications have been proposed in the pedicled technique for obese patients. We studied ischemic complications in our patients to investigate the effect of body weight on the outcome of TRAM flap breast reconstruction. Pertinent data from medical records of patients receiving a TRAM flap surgery from 1986 to 2011 were extracted. Patients were divided into three groups based on the body mass index (BMI): normal (<25 kg/m(2)), overweight (25-29.9 kg/m(2)), and obese (>30 kg/m(2)). Flap necrosis is defined as any visible nonviable tissue in the reconstructed breast. It was observed that 117 patients had received TRAM flap reconstruction. Fifty-eight patients were excluded. Of the remaining 59 cases, 24 had normal BMI, 21 were overweight, and 14 were obese. No patient was found to develop flap necrosis. Outcome of TRAM flap breast reconstruction in obese patients is similar to nonobese patients. No major necrosis in need of reoperation was identified in the studied obese patients. It was concluded that categorizing obesity as a relative contraindication to TRAM flap breast reconstruction should be revisited based on larger cohort studies.