Estrogen receptor beta (ERβ) expression in different subtypes of malignant pleural mesothelioma

Background: Estrogen receptor beta (ERβ) is a potential target for cancer therapy as a tumor suppressor. Malignant pleural mesothelioma (MPM) is a rare but fatal cancer. This study tries to estimate the incidence of ERβ expression in the various subtypes of MPM tumors. Methods and Materials: In a retrospective study performed at a pulmonary tertiary referral hospital, formalin-fixed paraffin-embedded human tissues of 46 definitive MPM were evaluated for expression of ERβ by immunohistochemistry. Results: ERβ was detected in 14 cases (30.4%) out of the total 46 patients with a mean age of 58.08±11.59 SD, including 33 (71.7%) males. There was no statistically significant difference in patients with positive ERβ staining versus negative cases in age and sex (P >0.05). MPM subtypes included 36 (78.2%) cases of epithelioid mesothelioma, 3 (6.5%) cases of sarcomatoid, 5 (10.8%) cases of biphasic, and 2 (4.3%) cases of desmoplastic subtype. ERβ expression was observed only in epithelioid (11 of total 36 cases) and biphasic (3 of total 5 cases) tumors. There was no significant difference in the incidence of ERβ expression in different subtypes of malignant pleural mesothelioma. Statistical analysis shows a significant difference in the expression of ERβ in the epithelioid subtype (with a more favorable prognosis) versus non-epithelioid subtypes (with poor prognosis, including sarcomatoid, desmoplastic, and biphasic) (P = 0.024). Discussion and Conclusion: Considering the higher proportion of the epithelioid type of MPM with ERβ expression, this highlights the role of ERβ in target therapy of MPM tumor, especially in the epithelioid subtype with a more favorable prognosis. A better understanding of the pathology of mesothelioma will eventually contribute to the development of therapies beyond the existing therapeutic platform.

Association of Serum Malondialdehyde and C-reactive protein Levels with Exacerbations of Chronic Obstructive Pulmonary Disease

Background: Chronic obstructive pulmonary disease (COPD) is related to oxidant/antioxidant imbalance and systemic inflammation Objective: This study was conducted to evaluate associations of serum levels of C-reactive protein (CRP) and malondialdehyde (MDA) with the severity and exacerbations of COPD. Methods: A matched case-control study was performed among 200 COPD patients (100 cases and 100 controls) who were referred to Masih Daneshvari Hospital in Tehran, Iran. Cases were exacerbators with equal to or greater than two ambulatory exacerbations or one hospitalization; controls were non-exacerbators who had one/no ambulatory exacerbation during the preceding 12 months. Blood samples were collected for CRP, MDA, and erythrocyte sedimentation rate (ESR) analysis. In addition, spirometry, the COPD assessment test (CAT) score, the modified Medical Research Council (mMRC) dyspnea scale, and the BODEx index were applied. Results: The mean (SD) age of the patients was 65.31 (8.46) years. Those with exacerbations had significantly lower FEV1 and higher CRP, MDA, ESR, BMI, BODEx index, CAT, and mMRC scores compared to non-exacerbators. There were significant differences in CRP, MDA, ESR, FVC, FEV1, FEV1/FVC, BMI, BODEx index, mMRC, and CAT scores between the GOLD group. Moreover, multivariate analysis showed that higher levels of CRP (OR=0.61, p=0.023), MDA (OR=0.28, p=0.001), ESR (OR=0.86, p=0.029), CAT score (OR=0.84, p=0.012), BODEx index (OR=0.89, p <0.001), BMI (OR=0.42, p <0.001), and lower FEV1% (OR=0.77, p <0.001) were independent risk factors for frequent exacerbations. Conclusion: In conclusion, elevated serum MDA and CRP levels in combination may serve as prognostic indicators of the severity and exacerbation of COPD.

Feasıbılıty of Transcutaneous Method for Carbon Dıoxıde Monıtorıng in an Intensive Care Unıt

Background: Transcutaneous partial pressure of carbon dioxide (PtCO2) monitorization provides a continuous and non-invasive measurement of partial pressure of carbon dioxide (pCO2). In addition, peripheral oxygen saturation (SpO2) can also be measured and followed by this method. However, data regarding the correlation between PtCO2 and arterial pCO2 (PaCO2) measurements acquired from peripheric arterial blood gas is controversial. Objective: We aimed to determine the reliability of PtCO2 with PaCO2 based on its advantages, like non-invasiveness and continuous applicability. Methods: Thirty-five adult patients with hypercapnic respiratory failure admitted to our tertiary medical intensive care unit (ICU) were included. Then we compared PtCO2 and PaCO2 and both SpO2 measurements simultaneously. Thirty measurements from the deltoid zone and 26 measurements from the cheek zone were applied. Results: PtCO2 could not be measured from the deltoid region in 5 (14%) patients. SpO2 and pulse rate could not be detected at 8 (26.7%) of the deltoid zone measurements. Correlation coefficients between PtCO2 and PaCO2 from deltoid and the cheek region were r: 0,915 and r: 0,946 (p = 0,0001). In comparison with the Bland-Altman test, difference in deltoid measurements was -1,38 ± 1,18 mmHg (p = 0.252) and in cheek measurements it was -5,12 ± 0,92 mmHg (p = 0,0001). There was no statistically significant difference between SpO2 measurements in each region. Conclusion: Our results suggest that PtCO2 and SpO2 measurements from the deltoid region are reliable compared to the arterial blood gas analysis in hypercapnic ICU patients. More randomized controlled studies investigating the effects of different measurement areas, hemodynamic parameters, and hemoglobin levels are needed.

Susceptibility to rhinovirus-induced early wheezing as a risk factor for subsequent asthma development

Rhinovirus is one of the two most common viral agents that cause bronchiolitis in young children. During the first 12 months, it is second to the respiratory syncytial virus, but after 12 months, it begins dominating the statistics. Wheezing and dry cough are typical clinical symptoms indicative of rhinovirus-induced bronchiolitis, although overlap of symptoms with other virus infections is common. Several studies have shown that atopic predisposition and reduced interferon responses increase susceptibility to rhinovirus-induced wheezing. More recent studies have found that certain genetic variations at strong asthma loci also increase susceptibility. Rhinovirus-induced wheezing in the early years of life is known to increase the risk of subsequent asthma development and may be associated with airway remodeling. This risk is increased by aeroallergen sensitization. Currently, there are no clinically approved preventive treatments for asthma. However, studies show promising results indicating that children with rhinovirus-affected first-time wheezing respond to bronchodilators in terms of less short-term symptoms and that controlling airway inflammatory responses with anti-inflammatory medication may markedly decrease asthma development. Also, enhancing resistance to respiratory viruses has been a topic of discussion. Primary and secondary prevention strategies are being developed with the aim of decreasing the incidence of asthma. Here, we review the current knowledge on rhinovirus-induced early wheezing as a risk factor for subsequent asthma development and related asthma-prevention strategies.

Treatment Outcomes of the Standardized Shorter MDR-TB Regimen under Programmatic Setting: A Retrospective Study from a Tertiary Care Centre, India

Background: The shorter regimen was widely accepted and advocated for MDR-TB treatment compared tothe conventional longer regimen. Evaluating the performance of both regimens in a programmatic setting will help in tailoring the treatment regimen of MDR-TB. Objectives: 1. To estimate the duration of sputum smear conversion in the shorter MDR-TB regimen. 2. To compare the treatment outcomes of the shorter MDR-TB regimen with that of the longer conventional MDR regimen in a programmatic set up in India. 3. To estimate the adverse drug reactions in the shorter MDR-TB regimen. Methods: A retrospective cross-sectional study was conducted on 320 patients enrolled under programmatic management of drug resistant tuberculosis (PMDT) from April 2017 to May 2019 at a nodal DRTB center and a tertiary care hospital in India. Demographic and clinical characteristics of those who received a shorter MDR-TB regimen were recorded. Treatment outcomes of both regimens were recorded. Treatment success is defined as ‘disease cured and treatment completed’, whereas treatment failure was considered when the treatment was either terminated or changed due to lack of bacteriological conversion at the end of an extended intensive phase or culture reversion in the continuation phase. Results: The treatment success observed in the shorter MDR-TB regimen was 61.25%, which was significantly higher than the conventional longer regimen (p=0.0007). Treatment failures were higher with a shorter MDR-TB regimen (p=0.0001). Conclusion: Treatment success with the shorter MDR-TB regimen though higher than the conventional regimen, is still way behind the target treatment success rate. Improving treatment adherence remains pivotal for achieving end TB targets.

Outcomes of liver transplantation from deceased donors with Coronavirus-disease 2019 and late complications of infection

Background: The transplant patients should be considered a main high-risk population during the COVID-19 outbreak due to the use of immunosuppressive regimens and comorbidities. Objective: This study aimed to evaluate the possibility of COVID-19 transmission by liver transplantation from a donor with a late complication of COVID-19 to the recipients. Method: This descriptive study was conducted on all the recipients of liver transplantation who had an acute liver failure or were the models for the End-Stage Liver Disease (MELD) higher than 20. Results: In general, 36 liver transplantation was performed during the study period. Out of these patients, only 14 cases (deceased donors) had hemorrhagic cerebrovascular accidents, and other donors died of trauma (n=7) and anoxia (n=15). All patients showed negative results for polymerase chain reaction (PCR) (two negative 24 h PCR), whereas their high-resolution computed tomography (HRCT) test revealed that they had previously lung involvement with COVID-19 as the late complication of the disease. Conclusion: This study supports the safety of continuing donation and transplant process during the outbreak even the transplant donor be infected previously with the COVID-19, which is reinforced by other similar pieces of evidence.

Impact of immunosuppressant agents on post liver transplant patients with COVID‐19

Background: It seems that transplant recipients are at high risk for severe COVID-19, especially in the presence of comorbidities and immunosuppression. This study aimed to determine the effects of previous treatment with immunosuppressants and received dosage and the risk of COVID-19 severity and mortality in liver transplant recipients in various post-transplantation phases in the Iranian population. Methods: : This was a cross-sectional study conducted among 24 patients in the post liver transplant course, who were referred to two transplant centers (Imam Reza and Montaseriyeh hospitals) affiliated to Mashhad University of Medical Sciences, Mashhad, Iran, during 2020-2021. The demographic and clinical characteristics of the patients were recorded in a checklist, and the relationships between various variables were analyzed. Results: The majority of the post liver transplant patients(96%) were in the late phase of post-transplantation, and 8.3% of the cases expired. COVID-19 severity and mortality did not show a significant relationship with previous treatment with immunosuppressants and received dosage (P>0.05). In addition, there was no relationship between the symptoms of COVID-19 and immunosuppressant dosages, except for a headache. No significant correlation was found between immunosuppressants dosage and laboratory findings, and only prednisolone dosage was found to be correlated with heart rate (r=-0.62, P=0.03), BUN (r=-0.84, P=0.002), and D-dimer (r=-0.72, P=0.01). Conclusion: Severe SARS-CoV-2 infection was reported in the majority of liver transplant recipients. The severity of COVID-19 was not related to previous treatment with immunosuppressants and received dosage

Changes in physiological variables in patients with diffuse interstitial lung disease in the six-minute walk test

Objective: Diffuse Interstitial Lung Disease (DILD) is a pathology with a high mortality rate in Colombia as well as around the world. Linking patients to pulmonary rehabilitation programs is essential to improve their quality of life and aerobic capacity; thus, all patients perform the six-minute walk test (6-MWT). This study aimed to describe the changes in physiological and aerobic capacity-related variables in patients with DILD in the 6-MWT at admission to a pulmonary rehabilitation program and determine possible differences between patients with idiopathic pulmonary fibrosis (IPF) and other DILDs. Methods: This is a cross-sectional descriptive study on patients with DILD who performed the 6-MWT between January 2017 and February 2019. Sociodemographic, clinical, physiological, and exercise tolerance variables were taken into account at four different times of the 6-MWT: Rest time, the end, and the first and the fifth minute after the end of the test. The Human Ethics Committee endorsed the study, and all participants signed the informed consent form. Results: There were 64 patients with DILD. The average age was 60.84 years, 53.1% were female, 73.4% required home oxygen, and 53.1% had a diagnosis of IPF. There were no statistically significant differences in the heart rate (HR), respiratory rate (RR), peripheral oxygen saturation (SpO2), Borg scale, and fatigue in lower limbs at the four evaluated moments of the test for both groups of patients with DILD (p=0.000); moreover, the FEV1/FVC ratio for patients with other DILD was higher (p=0.000). The distance traveled for IPF was 339.26±124.84, while for other DILDs, it was 365.63±113.00 (p=0.382). Conclusions: Patients with other DILDs have better FEV1/FVC and travel longer distances with less dyspnea and fatigue than patients with IPF during the 6-MWT. Both groups' HR, RR, SpO2, Borg, and fatigue variables presented significant changes during the 6-MWT.

Prevalence of Coronavirus Disease 2019 in the Brain-Dead Candidates for Transplantation and Uncommon Manifestations of the Infection

Aim: This study aimed to evaluate the prevalence of Coronavirus Disease 2019 (COVID-19) positive cases meeting clinical brain death criteria; moreover, it was attempted to assess the uncommon manifestations of the infection in this study. Materials and Methods: This retrospective observational study was conducted on all brain-dead patients who were referred to the emergency department of hospitals in Mashhad, Iran, from February to October 2020. The demographic characteristics, clinical information, and laboratory data were collected and recorded in a researcher-made checklist. Results: In general, 70 patients were included in this study. The PCR test result was positive for COVID-19 in 54% of the patients, and syncope was reported in 16.1% of the cases (n=10). Furthermore, the majority of the patients (52.9%) showed central nervous system (CNS) hemorrhagic manifestations. A comparison was made between the patients with positive and negative PCR test result in terms of syncope; accordingly, there was a significant difference between them in this regard (χ2=4.5; P=0.03). The CNS hemorrhagic manifestations were significantly higher in patients with positive PCR compared to those with negative PCR (χ2=4.57, P=0.03). Moreover, the grand glass opacity and pleural effusion were the most common findings of the chest computed tomography in brain-dead patients with COVID-19. Conclusion: Due to the high prevalence of COVID-19 among brain-dead patients, it seems that syncope attack should be regarded as one of the possible symptoms of COVID-19. Moreover, syncope as a result of COVID-19 may itself cause traumatic events. It is worth mentioning that CNS hemorrhagic manifestations have been reported in more than half of the patients with brain death.

Lung clearance index: a new measure of ventilation inhomogeneity in childhood respiratory diseases

: Conventional spirometry has long been considered the primary test for assessing respiratory function deficits in children and adults. However, the need to perform forced breathing maneuvers can make it challenging to perform these examinations in an uncooperative child. For these reasons, techniques such as gas dilutions and the multiple-breath-washout (MBW) method have been implemented because they allow for early assessment of damage to the small airways. These methods permit the determination of the possible presence of ventilatory inhomogeneity in the lungs by analyzing the clearance of an inert gas used as a tracer. The equipment consists of a mass spectrometer combined with a flow meter. The Lung Clearance Index (LCI) is most often used to evaluate ventilatory inhomogeneity. This narrative review aimed to review the literature on technical and practical aspects of the MBW test and evaluate the clinical implications of the LCI in pediatric respiratory disease.