Zaštitni utjecaj kacige gentex hgo-56/p na gubitak sluha kod pilota vojnih helikoptera

Aviation noise represents an important hazard for hearing loss among military pilots as they are continuously exposed to excessive noise during flight operations. Modern military aircraft, due to their maneuverability and tactical capabilities, require increasing engine power, while noise protection is limited only to the personal protective equipment which protects to a limited extent. Previous generations of helicopter pilots in the Croatian Air Force (CAF) used GSSH-A-18 headphones, whereas Gentex HGU-56/P helmets have been in use in CAF since 2004, primarily as mechanical protection for the head and secondarily to protect hearing. A study on hearing threshold measurements was performed on multi-purpose transport helicopter pilots who used headphones and helmets, respectively. The population of pilots who used GSSH-A-18 headphones had significantly higher hearing loss at higher frequencies, in the left ear, and in the speech area compared to the group using Gentex HGU-56/P helmets. The results of this study confirm the benefit of using of the Gentex HGU-56/P helmet to preserve the pilots’ hearing.Zrakoplovna buka predstavlja važnu opasnost za gubitak sluha među vojnim pilotima, budući da su kontinuirano izloženi prekomjernoj buci tijekom letačkih operacija. Moderno vojno zrakoplovstvo zbog svojih manevarskih sposobnosti i taktičkih mogućnosti zahtjeva povećanje snage motora, dok je zaštita od buke ograničena na osobnu zaštitnu opremu koja štiti do određene granice. Prijašnje generacije pilota helikoptera u Hrvatskom ratnom zrakoplovstvu (HRZ) koristile su GSSH-A-18 slušalice, dok su Gentex HGU-56/P kacige u upotrebi u HRZ-u od 2004. godine; primarno kao mehanička zaštita za glavu te sekundarno kao zaštita sluha. Studija o mjerenju praga sluha provedena je kod pilota višenamjenskih transportnih helikoptera, koji su koristili slušalice, odnosno kacige. Populacija pilota koja je koristila GSSH-A-18 slušalice imala je znatno viši gubitak sluha na visokim frekvencijama u lijevom uhu i u govornom području, u usporedbi s grupom koja je koristila kacige Gentex HGU-56/P. Rezultati ovog istraživanja potvrđuju korist korištenja kacige Gentex HGU-56/P pri očuvanju sluha pilota

Impact of pre-pregnancy BMI on blood glucose levels in pregnancy and on the anthropometry of newborns – preliminary insights from the Croatian Islands\u27 Birth Cohort Study (CRIBS)

The aim of this study was to investigate the relationship between pre-pregnancy body mass index (BMI) and fasting blood glucose level in pregnancy on the anthropometry of newborns. The sample consisted of 171 healthy pregnant women and their newborns from the Croatian Islands\u27 Birth Cohort Study. Peripheral blood of pregnant women was taken in the second trimester and fasting glucose values >5.1 mmol/l were considered elevated. Anthropometric variables (body weight, height and waist circumference) were measured according to the International Biological Program. Pre-pregnancy BMI and fasting glucose levels during pregnancy were significantly positively correlated (p<0,01), as were pre-pregnancy BMI and birth weight (p<0,05), length (p<0,01), and head circumference (p<0,05) of the newborns. Hyperglycaemic women gave birth to significantly heavier newborn girls then normal glycaemic women (p<0.05). In conclusion, there was a positive correlation between pre-pregnancy BMI, fasting glucose during pregnancy and the anthropometry of newborns in this study

Preliminary findings on the association of the lipid peroxidation product 4-hydroxynonenal with the lethal outcome of aggressive COVID-19

Major findings of the pilot study involving 21 critically ill patients during the week after admission to the critical care unit specialized for COVID-19 are presented. Fourteen patients have recovered, while seven passed away. There were no differences between them in respect to clinical or laboratory parameters monitored. However, protein adducts of the lipid peroxidation product 4-hydroxynonenal (HNE) were higher in the plasma of the deceased patients, while total antioxidant capacity was below the detection limit for the majority of sera samples in both groups. Moreover, levels of the HNE-protein adducts were constant in the plasma of the deceased patients, while in survivors, they have shown prominent and dynamic variations, suggesting that survivors had active oxidative stress response mechanisms reacting to COVID-19 aggression, which were not efficient in patients who died. Immunohistochemistry revealed the abundant presence of HNE-protein adducts in the lungs of deceased patients indicating that HNE is associated with the lethal outcome. It seems that HNE was spreading from the blood vessels more than being a consequence of pneumonia. Due to the limitations of the relatively small number of patients involved in this study, further research on HNE and antioxidants is needed. This might allow a better understanding of COVID-19 and options for utilizing antioxidants by personalized, integrative biomedicine approach to prevent the onset of HNE-mediated vitious circle of lipid peroxidation in patients with aggressive inflammatory diseases

Impact of pre-pregnancy BMI on blood glucose levels in pregnancy and on the anthropometry of newborns – preliminary insights from the Croatian Islands' Birth Cohort Study (CRIBS)

The aim of this study was to investigate the relationship between pre-pregnancy body mass index (BMI) and fasting blood glucose level in pregnancy on the anthropometry of newborns. The sample consisted of 171 healthy pregnant women and their newborns from the Croatian Islands’ Birth Cohort Study. Peripheral blood of pregnant women was taken in the second trimester and fasting glucose values >5.1 mmol/l were considered elevated. Anthropometric variables (body weight, height and waist circumference) were measured according to the International Biological Program. Pre-pregnancy BMI and fasting glucose levels during pregnancy were significantly positively correlated (p<0,01), as were pre-pregnancy BMI and birth weight (p<0,05), length (p<0,01), and head circumference (p<0,05) of the newborns. Hyperglycaemic women gave birth to significantly heavier newborn girls then normal glycaemic women (p<0.05). In conclusion, there was a positive correlation between pre-pregnancy BMI, fasting glucose during pregnancy and the anthropometry of newborns in this study

Short Survey on the Protein Modifications in Plasma during SARS-CoV-2 Infection

Although the COVID-19 pandemic has ended, it is important to understand the pathology of severe SARS-CoV-2 infection associated with respiratory failure and high mortality. The plasma proteome, including protein modification by lipid peroxidation products in COVID-19 survivors (COVID-19; n = 10) and deceased individuals (CovDeath; n = 10) was compared in samples collected upon admission to the hospital, when there was no difference in their status, with that of healthy individuals (Ctr; n = 10). The obtained results show that COVID-19 development strongly alters the expression of proteins involved in the regulation of exocytosis and platelet degranulation (top 20 altered proteins indicated by analysis of variance; p-value (False Discovery Rate) cutoff at 5%). These changes were most pronounced in the CovDeath group. In addition, the levels of 4-hydroxynonenal (4-HNE) adducts increased 2- and 3-fold, whereas malondialdehyde (MDA) adducts increased 7- and 2.5-fold, respectively, in COVID-19 and CovDeath groups. Kinases and proinflammatory proteins were particularly affected by these modifications. Protein adducts with 15-deoxy-12,14-prostaglandin J2 (15d-PGJ2) were increased 2.5-fold in COVID-19 patients, including modifications of proteins such as p53 and STAT3, whereas CovDeath showed a decrease of approximately 60% compared with Ctr. This study for the first time demonstrates the formation of lipid metabolism products—protein adducts in plasma from survived and deceased COVID-19 patients, significantly distinguishing them, which may be a predictor of the course of SARS-CoV-2 infection

Neutrophil-to-lymphocyte and platelet-to-lymphocyte ratio help identify patients with lung cancer, but do not differentiate between lung cancer subtypes

AIM: To assess the diagnostic value of neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) in lung cancer (LC). We compared the ratios between healthy participants and all LC patients, as well patients with different pathohistological LC subtypes. ----- METHODS: We retrieved the data on neutrophil, lymphocyte, and platelet levels in 449 patients with different pathohistological LC subtypes (non-small cell LC, small-cell LC, atypical or metastatic LC, neuroendocrine, and sarcomatoid carcinoma) and 47 healthy controls. NLR and PLR were calculated by dividing the absolute number of neutrophils or platelets with the absolute number of lymphocytes. ----- RESULTS: There were significant differences in both NLR and PLR (P<0.001) between all LC patients and the control group, but there were no differences between patients with different LC subtypes. Reciever operating characteristics analysis for NLR showed the optimal cut-off value of 2.71, with a sensitivity of 77.05% and specificity of 87.23%. The optimal cut-off value for PLR was 182.31, with a sensitivity of 51.09% and specificity of 91.49%. ----- CONCLUSION: The results showed that the NLR and PLR may have added value in the early diagnosis of LC, but further research is needed to confirm these results

Lipidomics Revealed Plasma Phospholipid Profile Differences between Deceased and Recovered COVID-19 Patients

Thorough understanding of metabolic changes, including lipidome alteration, associated with the development of COVID-19 appears to be crucial, as new types of coronaviruses are still reported. In this study, we analyzed the differences in the plasma phospholipid profiles of the deceased COVID-19 patients, those who recovered and healthy people. Due to identified abnormalities in plasma phospholipid profiles, deceased patients were further divided into two subgroups (D1 and D2). Increased levels of phosphatidylethanolamines (PE), phosphatidylcholines (PC) and phosphatidylserines (PS) were found in the plasma of recovered patients and the majority of deceased patients (first subgroup D1) compared to the control group. However, abundances of all relevant PE, PC and PS species decreased dramatically in the plasma of the second subgroup (D2) of five deceased patients. These patients also had significantly decreased plasma COX-2 activity when compared to the control, in contrast to unchanged and increased COX-2 activity in the plasma of the other deceased patients and recovered patients, respectively. Moreover, these five deceased patients were characterized by abnormally low CRP levels and tremendous increase in LDH levels, which may be the result of other pathophysiological disorders, including disorders of the immune system, liver damage and haemolytic anemia. In addition, an observed trend to decrease the autoantibodies against oxidative modifications of low-density lipoprotein (oLAb) titer in all, especially in deceased patients, indicate systemic oxidative stress and altered immune system that may have prognostic value in COVID-19

The Impact of Severe COVID-19 on Plasma Antioxidants

Several studies suggested the association of COVID-19 with systemic oxidative stress, in particular with lipid peroxidation and vascular stress. Therefore, this study aimed to evaluate the antioxidant signaling in the plasma of eighty-eight patients upon admission to the Clinical Hospital Dubrava in Zagreb, of which twenty-two died within a week, while the other recovered. The differences between the deceased and the survivors were found, especially in the reduction of superoxide dismutases (SOD-1 and SOD-2) activity, which was accompanied by the alteration in glutathione-dependent system and the intensification of the thioredoxin-dependent system. Reduced levels of non-enzymatic antioxidants, especially tocopherol, were also observed, which correlated with enhanced lipid peroxidation (determined by 4-hydroxynonenal (4-HNE) and neuroprostane levels) and oxidative modifications of proteins assessed as 4-HNE-protein adducts and carbonyl groups. These findings confirm the onset of systemic oxidative stress in patients with severe SARS-CoV-2, especially those who died from COVID-19, as manifested by strongly reduced tocopherol level and SOD activity associated with lipid peroxidation. Therefore, we propose that preventive and/or supplementary use of antioxidants, especially of lipophilic nature, could be beneficial for the treatment of COVID-19 patients

Diversified Effects of COVID-19 as a Consequence of the Differential Metabolism of Phospholipids and Lipid Peroxidation Evaluated in the Plasma of Survivors and Deceased Patients upon Admission to the Hospital

As a result of SARS-CoV-2 infection, inflammation develops, which promotes oxidative stress, leading to modification of phospholipid metabolism. Therefore, the aim of this study is to compare the effects of COVID-19 on the levels of phospholipid and free polyunsaturated fatty acids (PUFAs) and their metabolites produced in response to reactions with reactive oxygen species (ROS) and enzymes (cyclooxygenases-(COXs) and lipoxygenase-(LOX)) in the plasma of patients who either recovered or passed away within a week of hospitalization. In the plasma of COVID-19 patients, especially of the survivors, the actions of ROS and phospholipase A2 (PLA2) cause a decrease in phospholipid fatty acids level and an increase in free fatty acids (especially arachidonic acid) despite increased COXs and LOX activity. This is accompanied by an increased level in lipid peroxidation products (malondialdehyde and 8-isoprostaglandin F2&alpha;) and lipid mediators generated by enzymes. There is also an increase in eicosanoids, both pro-inflammatory as follows: thromboxane B2 and prostaglandin E2, and anti-inflammatory as follows: 15-deoxy-&Delta;-12,14-prostaglandin J2 and 12-hydroxyeicosatetraenoic acid, as well as endocannabinoids (anandamide-(AEA) and 2-arachidonylglycerol-(2-AG)) observed in the plasma of patients who recovered. Moreover, the expression of tumor necrosis factor &alpha; and interleukins (IL-6 and IL-10) is increased in patients who recovered. However, in the group of patients who died, elevated levels of N-oleoylethanolamine and N-palmitoylethanolamine are found. Since lipid mediators may have different functions depending on the onset of pathophysiological processes, a stronger pro-inflammatory response in patients who have recovered may be the result of the defensive response to SARS-CoV-2 in survivors associated with specific changes in the phospholipid metabolism, which could also be considered a prognostic factor

Relationship between 4-Hydroxynonenal (4-HNE) as Systemic Biomarker of Lipid Peroxidation and Metabolomic Profiling of Patients with Prostate Cancer

An oxidative degradation product of the polyunsaturated fatty acids, 4-hydroxynonenal (4-HNE), is of particular interest in cancer research due to its concentration-dependent pleiotropic activities affecting cellular antioxidants, metabolism, and growth control. Although an increase in oxidative stress and lipid peroxidation was already associated with prostate cancer progression a few decades ago, the knowledge of the involvement of 4-HNE in prostate cancer tumorigenesis is limited. This study investigated the appearance of 4-HNE-protein adducts in prostate cancer tissue by immunohistochemistry using a genuine 4-HNE monoclonal antibody. Plasma samples of the same patients and samples of the healthy controls were also analyzed for the presence of 4-HNE-protein adducts, followed by metabolic profiling using LC-ESI-QTOF-MS and GC-EI-Q-MS. Finally, the analysis of the metabolic pathways affected by 4-HNE was performed. The obtained results revealed the absence of 4-HNE-protein adducts in prostate carcinoma tissue but increased 4-HNE-protein levels in the plasma of these patients. Metabolomics revealed a positive association of different long-chain and medium-chain fatty acids with the presence of prostate cancer. Furthermore, while linoleic acid positively correlated with the levels of 4-HNE-protein adducts in the blood of healthy men, no correlation was obtained for cancer patients indicating altered lipid metabolism in this case. The metabolic pathway of unsaturated fatty acids biosynthesis emerged as significantly affected by 4-HNE. Overall, this is the first study linking 4-HNE adduction to plasma proteins with specific alterations in the plasma metabolome of prostate cancer patients. This study revealed that increased 4-HNE plasma protein adducts could modulate the unsaturated fatty acids biosynthesis pathway. It is yet to be determined if this is a direct result of 4-HNE or whether they are produced by the same underlying mechanisms. Further mechanistic studies are needed to grasp the biological significance of the observed changes in prostate cancer tumorigenesis