Physiological Alterations Research Articles

Associations of light-adapted electroretinogram in paediatric amblyopia.

The aim of this study was to investigate changes in the light-adapted (LA) electroretinogram (ERG) associated with paediatric amblyopia. A total of 220 eyes from 81 postoperative paediatric cataract patients and 29 healthy children were enrolled in four groups, namely controls, unilaterally amblyopic eyes, non-amblyopic fellow eyes and bilaterally affected eyes. Differences in LA ERG variables (peak time and amplitude of a- and b-waves and photopic negative response [PhNR]) were compared across groups, as well as their associations with visual acuity and changes in axial length. The peak time of both the a-wave (p < 0.001) and b-wave (p < 0.001), as well as the amplitude of the b-wave (p < 0.001) and the PhNR (p = 0.04) differed significantly across groups. Compared to controls, affected eyes in both unilateral and bilateral groups showed significantly lower b-wave amplitude and longer a- and b-wave peak times (p < 0.008, Bonferroni-corrected). Additionally, fellow eyes in the unilateral group exhibited significantly longer b-wave peak times (p = 0.008). For all eyes, poorer visual acuity was associated with a longer peak time for both the a- (p = 0.006) and b-waves (p = 0.003), as well as lower amplitudes of the b-wave (p = 0.006) and PhNR (p = 0.02). Changes in LA ERG components suggest alteration of retinal physiology in deprivation amblyopia. Thus, the LA ERG may provide additional information to help understand the mechanisms underlying deprivation amblyopia.

Peripherally induced movement disorders in the stomatognathic system after oral surgical or dental procedures.

Peripherally induced movement disorders (PIMD) are hyperkinetic movement disorders that can occur after injury to a part of the body. This study aimed to identify PIMD in the stomatognathic system following dental or oral surgical procedures. A total of 229 patients with PIMD (144 women and 85 men; mean age: 53.4 years) triggered by oral surgical or dental interventions were evaluated retrospectively. The average latency between the procedures and onset of PIMD was 14.3 days. Oral surgery (40.2%), including tooth extraction, trauma treatment, and other surgical procedures, was the most frequent trigger of PIMD. This was followed by general dental treatment, including periodontal, endodontic, and restorative procedures (36.7%), prosthetic treatment (19.7%), and orthodontic treatment (3.5%). PIMD consisted of oromandibular dystonia (73.8%), functional (psychogenic) movement disorders (11.4%), orolingual dyskinesia (7.9%), and hemimasticatory spasms (5.7%). These results suggest that even minor alterations in normal anatomy or physiology after dental procedures may result in PIMD in predisposing patients. Dental professionals should be aware that although infrequently, PIMD can develop after various dental treatments. If such symptoms precipitate, the attending physician should properly explain them to the patient and provide appropriate treatment or consultation with a movement disorder specialist.

Considerations for Anesthesia in Older Adults with Cannabis Use.

Over the past decade, legislative changes occurred in the USA and the western world that were followed by a substantial increase in reported use of cannabis among the general population. Among patients undergoing anesthesiafor surgery or interventional procedures, older patients-often defined as adults over 65 years-are one of the fastest-growing populations. Within this group, the prevalence of cannabis use almost tripled over the past decade. In addition to habitual cannabis use, recommendations for treatment of chronic pain with cannabinoids have become increasingly more common. The clinical relevance of cannabis use in older adults is supported by recent studies linking it to increased anesthetic requirements as well as respiratory, cardiovascular, and psychiatric complications following surgery. Still, evidence remains equivocal, as these associations may largely depend on the type, frequency, and route of cannabis administration, and current research is mostly limited to retrospective cohort studies. Multisystemic effects of cannabis can become especially relevant in patients of advanced age undergoing anesthesia, characterized by physiological and pharmacodynamic alterations as well as a higher risks of drug-to-drug interactions. Best-practice guidelines emphasize the need for detailed, systematic preoperative screening for habits of cannabis use, including the history, type, and frequency, to guide perioperative management in these patients. This review discusses considerations for anesthesia in older patients with habitual cannabis use while highlighting strategies and recommendations to ensure safe and effective anesthesia care.

Allium cepa L. as a natural antioxidant: Its efficacy in combating heat stress-induced physiological alterations

Heat stress (HS) is a major physiological stressor that induces oxidative damage, inflammation, and metabolic disruptions, all of which cause harm to health. This study investigates the potential protective effects of Allium cepa L. (AC), against the physiological alterations brought on by HS. Twenty male rats were utilized in this study and divided into 4 groups: Control, HS, AC, and HS + AC. Rats were exposed to 38–39 °C for 2 h each day for three weeks to induce HS while 1.0 ml/100 g body weight of ethanolic extract of AC was administered orally for three weeks. Hematological parameters, inflammatory markers, and lipid profiles were analyzed using blood samples obtained through heart puncture.The findings demonstrated that HS significantly lowered levels of hemoglobin (HB), red blood cell (RBC) counts, and antioxidant enzyme activity. However, there was a significant rise in the levels of inflammatory markers, platelet counts, LDL-c triglyceride (TG), total cholesterol (TC), and white blood cell (WBC). Many of these alterations were reversed by AC supplementation, by increasing RBC counts, HB levels, and antioxidant enzyme activities while decreasing LDL-c, TG and TC, MDA, and TNF-α (tumor necrosis factor-α). However, the positive benefits of AC were partially diminished in the HS + AC group, perhaps due to the severe oxidative stress caused by heat stress (HS).This study highlights the probable potential of AC as a natural antioxidant in modifying heat stress-induced oxidative damage, hematological changes, and lipid metabolism disruptions; however, its protective effects are insufficient to mitigate heat stress. Therefore, further research is required to explore the other possible underlying mechanisms.

Intrauterine Fetal Death and the COVID-19 Pandemic: Looking beyond SARS- CoV-2 Infection

Background: COVID-19 pandemic has caused high numbers of deaths and complications since 2020. Though the risk is the same as in the general population, pregnant women with COVID-19 are especially susceptible to developing complications because of their altered physiology. The objective of this retrospective study is to investigate the relationship betweenthe COVID-19 pandemic period and intrauterine fetal death, which can help to take steps to reduce intrauterine fetal death during the pandemic. Materials and methods: This retrospective study compared the intrauterine fetal death rate during the pre-pandemic (March 01, 2019 to February 29, 2020) and the pandemic period (March 01, 2020, to February 28, 2021) in a tertiary referral hospital in Bangladesh. Patient data were collected from the record-keeping register of the Department of Obstetrics and Gynecology and analyzed by computer-based software presented in graph, chart and table. Results: Out of 21717 obstetric patients admitted patients,821 (3.78%) were documented as cases of intrauterine fetal death in the pre-pandemic period, whereas in the pandemic period, the number was 895 (4.86%) out of 18424. Due to inadequate data records and considering the exclusion criteria, a total of 790 IUFD patients of the pre-pandemic period and 860 IUFD patients of the pandemic period were included in this study. Conclusion: The percentage of IUFD on obstetric admission showed significantly (p&lt;0.001) higher in the pandemic period compared to that in the pre-pandemic period. This result is important for providing insights to the policy makers for future planning, counseling of women wishing to become pregnant, and prioritizing their safety, including their vaccination. Chatt Maa Shi Hosp Med Coll J; Vol.22 (2); July 2023; Page 47-50

Comparative analysis of bone health and glycemic control in postmenopausal women: insights from clinical data

Abstract Background Menopause leads to significant physiological and biochemical alterations that impact different aspects of health, such as bone mineral metabolism and glycemic control. It is imperative to comprehend these alterations in order to identify potential health hazards and develop preventative measures. This comparative cross-sectional study aimed to evaluate bone-associated markers and glycemic control indices in postmenopausal women (PMP). Methods A sample of 100 women aged 30 years or older was randomly selected and categorized into three groups: PMP (n = 60), premenopausal (PRM) (n = 20), and women in the reproductive age group (RWA) (n = 20). Venous blood samples were collected, and fasting blood glucose (FBG), calcium, phosphorus, uric acid, and alkaline phosphatase (ALP) levels were analyzed using standard laboratory techniques. The insulin and estrogen levels were evaluated using enzyme-linked immunosorbent assay (ELISA), and Homeostasis model assessment of insulin resistance (HOMA-IR), Quantitative insulin sensitivity check index (QUICKI), and Fasting insulin resistance index (FIRI) were calculated. A significance level of p &lt; 0.05 was used in the statistical analysis conducted using SPSS version 25.0. Results The PMP and PRM groups showed significantly greater mean values of FBG, insulin, and HOMA-IR when compared to RWA (p &lt; 0.05), while these groups had lower QUICKI levels. Similar trends were noted for bone-associated markers, with significant differences among the groups (p &lt; 0.05). The correlation results showed that QUICKI had positive correlations with both ALP and phosphorus, while FBG and FIRI had negative connections with both. Conclusion Postmenopausal women demonstrated higher levels of glycemic control indices and bone-related markers compared to premenopausal and reproductive-age women, indicating potential risks for osteoporosis and obesity.

Characterization of Citrus Rootstock Under Conditions of Boron Toxicity

Boron (B) is an essential element for an adequate development of citrus orchards. However, citrus trees are vulnerable to high B concentrations, generating morphological and physiological alterations incompatible with the proper production of citrus. In this sense, citrus rootstocks can provide valuable capabilities to citrus trees including tolerance to different stresses. The objective of this work is the characterization of 2247 × 6070–02–2 citrus rootstock using as a reference Carrizo citrange rootstock under B toxicity conditions (2.5 mM boric acid). Carrizo citrange is a diploid hybrid, and 2247 × 6070–02–2 is a novel low-HLB-sensitive tetraploid. B excess effects were analyzed after four weeks of treatment using 0.05 (control) and 2.5 mM (toxicity) H3BO3 concentrations, respectively, in hydroponic growth conditions. The characterization of 2247 × 6070–02–2 rootstock compared to Carrizo citrange was performed by measuring physiological parameters in leaves related to photosynthesis, stress oxidative responses, B content, and gene expression. The lower transpiration rate and, especially, the higher expression of the CsXIP1;1 gene and the better antioxidant defense mechanisms shown by 2247 × 6070–02–2 make this rootstock more tolerant to high B content than Carrizo citrange.

Analysis of physiological and biochemical changes and metabolic shifts during 21-Day fasting hypometabolism

This study aimed to evaluate the impact of prolonged fasting on the physiological and biochemical alterations and metabolic shifts in healthy adults and to provide experimental data and theoretical support for the hypometabolic state induced by prolonged fasting. Thirteen volunteers were selected through public recruitment to undergo a 21-day complete fasting experiment. The experimental period lasted 34 days, including a 3-day baseline, 21-day completing fasting, 5-day calorie restriction and 5-day full recovery diet. Physiological indicators such as body weight, blood pressure, blood glucose, blood ketones, and blood uric acid were evaluated along with resting metabolic rate, routine blood tests, liver function, and heart function indexes employing traditional approaches. During the 21-day complete fasting period, there was a significant decrease in body weight (average − 14.96 ± 1.55%), a reduction in blood glucose (average − 21.63 ± 0.058%), an increase in blood ketones (from baseline 0.1 ± 0.04 mmol/L to 6.61 ± 1.25 mmol/L) and blood uric acid (from baseline 385.38 ± 57.78 µmol/L to 866.31 ± 172.01 µmol/L), a continuous decline in resting energy expenditure (average − 20.3 ± 11.13%), and the respiratory quotient tending towards fat metabolism. Most of the items in the complete blood count and liver indicators remained stable and within the normal range. Heart function showed functional adaptive changes without structural damage. Prolonged fasting can reduce the body’s resting energy expenditure and adapt to body weight loss through physiological regulatory mechanisms without adverse effects on basic physiological functions or the structure of important organs. Under medical supervision, healthy adults can safely engage in prolonged fasting for up to 21 days with metabolic adaption and no damage to pivotal organ, which could provide potential technical support for human health and survival strategies in extreme conditions such as food shortages during long-duration manned spaceflight.

A study on the effect of Hypericum perforatum L. extract on vanadium toxicity in Allium cepa L.

The growth of industrialization growth the risk of vanadium (V) contamination. The objective of this study was to examine the impact of 200 µg L− 1 VCI3 -induced toxicity as well as the potential protective effect of 187.5 mg L− 1 and 375 mg L− 1Hypericum perforatum (H. perforatum) extracts against this toxicity on the Allium cepa (A. cepa) model organism. For this purpose, a series of investigations were conducted on the growth physiology alterations (germination percentage, root elongation, weight gain), cytogenetic alterations (mitotic index, micronucleus, chromosomal aberrations), biochemical alterations (malondialdehyde, superoxide dismutase, catalase) and defects in meristematic tissue in A. cepa. In addition, the phenolic compound content of H. perforatum extract was determined by the LC/MS-MS method. V application negatively affected all the investigated parameters and caused a serious phytotoxic and genotoxic effect as well as oxidative stress in A. cepa. Conversely, no statistical difference was observed between the parameters of the groups treated with H. perforatum extract and those of the control group. The administration of H. perforatum extract combined with V resulted in a notable enhancement in germination percentage, root elongation, weight gain, mitotic index value, chlorophyll a level and chlorophyll b level. Additionally, it led to a reduction in micronucleus and chromosomal aberrations frequencies, as well as meristematic tissue defects. Furthermore, LC/MS-MS analysis demonstrated that H. perforatum extract contains phenolic compounds, including catechin, epicatechin, quercetin, oleuropein and rutin, which confer antioxidant properties to the extract. The study provided clear evidence that H. perforatum extract attenuates the toxic effects of V in A. cepa, which can be attributed to its high content of bioactive phenols. The findings of the study indicate that H. perforatum extract may serve as a protective natural agent for daily use against heavy metal toxicity.

Adverse drug reactions and its associated factors among geriatric hospitalized patients at selected comprehensive specialized hospitals of the Amhara Region, Ethiopia: a multicenter prospective cohort study

BackgroundAdverse drug reactions are more prevalent in geriatric patients and are frequently associated with a range of polypharmacy-related issues as well as some physiological aging-related alterations. These affect the pharmacokinetic and pharmacodynamic properties of drugs. This study aimed to assess the magnitude of ADRs and their contributing factors among geriatric patients admitted at Comprehensive Specialized Hospitals of the Amhara Region.MethodsA multicenter prospective cohort study was carried out from May 2023 to August 2023 on geriatric patients admitted to four randomly selected comprehensive hospitals in the Amhara region. We used logistic regression to find the factors influencing the occurrence of ADRs. A P value of less than 0.05 was deemed statistically significant.ResultsDuring the study’s follow-up period, 373 patients in total were included. An incidence rate of 31.10% (95% CI: 26.38–35.82) was obtained from the identification of 121 ADRs in total. The organ most frequently affected by ADRs was the gastrointestinal tract (28.92%), followed by the cardiovascular system (19.01%), and the drug class most often implicated in ADRs was antibiotics (21.49%), then anticoagulants (12.40%). ADRs were substantially linked to being overweight (P < 0.001), having been hospitalized in the previous six months (P = 0.000), and hyperpolypharmacy (p = 0.047). 93.39% of all ADRs received the interventions. 85.12% of the adverse drug reactions were successfully resolved.ConclusionsThis study found that over one-third of older people and individuals admitted to the hospital experienced ADRs. Overweight, hyperpolypharmacy, and patients who had previously been admitted during the preceding six months were significantly linked with the occurrence of ADRs. Improving the drug safety of elderly patients, particularly those who are admitted, should be a greater priority for healthcare professionals.

Spontaneous rupture of an ovarian artery aneurysm complicated by postpartum hypertensive disorders of pregnancy after caesarean section: a case report and literature review

BackgroundThe spontaneous rupture of an artery aneurysm during the perinatal period is considered a serious complication associated with the physiological alteration by pregnancy and delivery. The rupture of an ovarian artery aneurysm is rare and leads to rapid retroperitoneal hemorrhage. Here, we report one case complicated by postpartum hypertensive disorder of pregnancy associated with massive bleeding into retroperitoneal cavity by the spontaneous rupture of ovarian artery aneurysm after caesarean section, and reviewed previous literature.Case presentationA 41-year-old Japanese woman was referred to our hospital four days after undergoing cesarean delivery because of hemorrhagic shock with abdominal and right flank pain. Contrast-enhanced computed tomography revealed a large retroperitoneal hematoma. Angiography showed a ruptured right ovarian artery aneurysm, anastomosing with a dilated uterine artery. She was successfully treated with transcatheter arterial embolization. She was diagnosed with postpartum hypertensive disorder of pregnancy 3 days after the embolization.ConclusionThe rupture of ovarian aneurysm can occur during the perinatal period, although it has not been widely understood among obstetricians. Multiparity and hypertensive disorder of pregnancy might be risk factors for the rupture of an ovarian aneurysm. Early diagnosis and therapy, such as transcatheter arterial embolization in preparation for an emergency laparotomy, are crucially important for the management of this fatal disease.

Attentional failures after sleep deprivation represent moments of cerebrospinal fluid flow.

Sleep deprivation rapidly disrupts cognitive function, and in the long term contributes to neurological disease. Why sleep deprivation has such profound effects on cognition is not well understood. Here, we use simultaneous fast fMRI-EEG to test how sleep deprivation modulates cognitive, neural, and fluid dynamics in the human brain. We demonstrate that after sleep deprivation, sleep-like pulsatile cerebrospinal fluid (CSF) flow events intrude into the awake state. CSF flow is coupled to attentional function, with high flow during attentional impairment. Furthermore, CSF flow is tightly orchestrated in a series of brain-body changes including broadband neuronal shifts, pupil constriction, and altered systemic physiology, pointing to a coupled system of fluid dynamics and neuromodulatory state. The timing of these dynamics is consistent with a vascular mechanism regulated by neuromodulatory state, in which CSF begins to flow outward when attention fails, and flow reverses when attention recovers. The attentional costs of sleep deprivation may thus reflect an irrepressible need for neuronal rest periods and widespread pulsatile fluid flow.

Effect of Nicotine on Pulmonary Pathogenic Bacteria.

Exposure to cigarette smoke significantly enhances susceptibility to bacterial infections by inducing physiological and structural alterations, including immune system dysregulation. This exposure also augments bacterial virulence including biofilm formation, leading to severe infectious diseases and antibiotic resistance. Notably, cigarette smoke exposure increases the incidence of pneumonia by up to 2.5-fold and tuberculosis by up to 4.1-fold. Nicotine, a primary constituent of cigarette smoke, has been extensively characterized for its immunomodulatory effects. However, despite the wealth of knowledge on nicotine's impact on the host immune response, there is a paucity of data regarding its direct effects on various pulmonary pathogens. In the present review, we discuss the main findings in this field.

Ultrasonographic Evaluation of Effects of Pregnancy on Thyroid Volume in a Nigerian Cohort

Background: During pregnancy, the thyroid gland experiences physiological changes critical for metabolism regulation. Ultrasonography provides a non-invasive means to assess these changes effectively. Thyroid gland responds physiologically to increased demands for iodine and energy which is the case in pregnant women. Aim: This study aims to evaluate the physiological and pathological alterations in the thyroid gland of pregnant women across gestational ages (0-40 weeks) at a specialist hospital in Port Harcourt, Nigeria. The study is also aimed at giving normative values of thyroid volume in pregnancy which helps in ascertaining when a pregnant woman develops goiter as well as properly monitor thyroid hormones. Methods: A prospective study involving 559 healthy pregnant women was conducted from September 2023 to May 2024. Data collected included age, BMI, weight, and height. Thyroid volume was assessed via ultrasound. Statistical analysis was performed using SPSS version 21.0 with a significance level set at p &lt; 0.05. Results: The mean maternal age was 29.95 ± 6.34 years. Significant positive correlations were observed between thyroid volume in the right lobe and variables such as age, BMI, weight, and height. The left lobe volume showed a positive correlation with parity. Conclusion: The study confirms thyroid volume increases during pregnancy, with significant correlations to specific demographic and anthropometric factors. These findings underscore the importance of routine ultrasonographic evaluation of the thyroid in pregnant women for early detection and management of potential disorders.

Neurodevelopmental Process Monitoring of Cytosine Arabinoside-Exposed Neurons Using Raman Spectroscopy.

Raman spectroscopy is used to monitor the development of live neurons exposed to cytosine arabinoside (ara-C). Ara-C is widely used to culture neurons and exclude non-neuronal cells. In this study, Raman spectra obtained from neurons exposed to ara-C were plotted using an analytical model of neuronal development to evaluate the impact of ara-C on neuronal development. After two days of culturing, neurons were exposed to ara-C for 24 h at final concentrations of 0 (control), 5, and 25 μM. Principal component analysis (PCA) was performed to build an analytical model for evaluating neurodevelopmental disorders caused by ara-C treatment. We projected the Raman spectra obtained from ara-C-treated cells onto the control group dataset. The distribution of PC1 scores for neurons exposed to ara-C at a final concentration of 5 μM was not significantly different from that of the control group. In contrast, under a final concentration of 25 μM, the data population at 10 and 15 days of culturing overlapped significantly with that of neurons at 4 days of normal culturing. These results suggest that Raman spectroscopy can detect very small physiological alterations in the neurons even after a short-term exposure (24 h) of ara-C. Our analytical method has high potential to evaluate the developmental stages for living neurons under exposure to chemicals.

Successful use of single-port laparoscopic surgery for ovarian cyst removal on postpartum day two after vaginal delivery.

This report describes a single-port laparoscopic approach for giant ovarian cystectomy tailored for postpartum patients. For asymptomatic giant ovarian cysts reaching full term, timely postpartum single-port laparoscopic surgery may confer benefits by utilizing physiological alterations to mitigate risks and enhance surgical outcomes.

Phthalate exposure and reproductive effects in rodents: a model for approaches on the protective role of natural products.

This review article summarizes the experimental findings in rodents published between 2014 and 2024 concerning phthalates exposure and reproductive outcomes. Rodents were chosen for this review since most studies that have developmental aspects in different phases of exposure and that address more in-depth reproductive mechanisms have been carried out in mice and rats. The evidence of adverse effects of phthalates on fetal development and human and animal reproduction is extensive, with impacts ranging from gene expression to physiological alterations. Despite the large volume of scientific papers pointing out the harmful effects of exposure to phthalates, isolated or in mixtures, at different developmental periods, most of them are associated with the maternal exposure and long-term effects in the offspring. Regular vegetables, fruits, fish, dairy products, and whole grains intake rich in bioactive compounds can mitigate the adverse effects of EDCs in humans and animals at different developmental periods. Various food bioactive compounds (FBCs) such as genistein, resveratrol, lycopene, vitamin E, curcumin, selenium, and plant secondary metabolites (PSMs) present antioxidant, anti-inflammatory, anti-tumor, and other biological properties with the potential to reduce of deleterious effects of phthalates on the reproductive tract. In this review, we aimed to summarize the main studies produced in the last decade about phthalate exposure and reproductive disorders in males and females (at different developmental critical windows). Additionally, we proposed some FBCs and PSMs that could attenuate the main adverse effects caused by phthalate exposure on male reproduction since there is a lack of studies with females.

EVALUATION OF HEMODYNAMIC CHANGES IN PATIENTS WITH URGENT SURGICAL PATHOLOGY IN MILITARY MEDICINE

This study evaluates hemodynamic changes in patients with urgent surgical pathologies within the context of military medicine. Hemodynamic stability is crucial for optimizing outcomes in military surgical patients who often present with unique challenges, such as trauma, limited resources, and delayed medical evacuation. The research focuses on identifying key physiological alterations, assessing the efficacy of current monitoring techniques, and exploring advanced therapeutic interventions tailored to the military environment. By analyzing clinical data from a cohort of military surgical cases, this study provides insights into the relationship between hemodynamic parameters and outcomes, aiming to enhance decision-making in field-based surgical care. The findings highlight the importance of early intervention, advanced monitoring technologies, and protocol-driven resuscitation to improve survival rates and reduce complications in this population.

Cardiopulmonary Physiology of Hypoxemic Respiratory Failure among Preterm Infants with Septic Shock

To examine cardiopulmonary physiological alterations associated with hypoxemic respiratory failure (HRF; fraction of inspired oxygen ≥0.60) among preterm neonates requiring vasopressors/inotropes during sepsis (septic shock). We conducted a retrospective cohort study from 2015 through 2022 at a tertiary neonatal intensive care unit. Neonates <34 weeks gestational age who had septic shock and underwent a comprehensive targeted neonatal echocardiography (TNE) ≤72 hours of sepsis onset were included. TNE findings of patients with shock and HRF were compared with those with shock without HRF. Indices of pulmonary vascular resistance (PVR), right (RV) and left (LV) ventricular systolic and diastolic function, measured using conventional, tissue Doppler imaging and speckle-tracking echocardiography, were examined. Of 52 included infants with septic shock, 19 (37%) also had HRF. Baseline characteristics were similar. On TNE, although the HRF group more frequently had bidirectional/right-to-left flow across the patent ductus arteriosus (67% vs. 33%; p=0.08), all indices of PVR and RV function were similar. However, the HRF group demonstrated reduced LV systolic function [ejection fraction: 51.8±12.3 vs. 62.6±13.0%; global peak systolic longitudinal strain -15.2±4.5 vs. -18.6±4.5%], diastolic function [early (2.3±1.0 vs. 3.6±1.2 /s) and late (2.4 (1.9, 2.6) vs. 2.8 (2.3, 3.5) /s diastolic strain rate], and higher frequency of LV output <150 ml/min/kg (44 vs. 12%); all p<0.05. Acute HRF occurring in preterm neonates with septic shock is associated with alterations in TNE measures of LV function, and not PVR or RV function. Future studies should evaluate the impact of supporting LV function in these patients.

The influence of inactivated entomopathogenic bacterium Bacillus thuringiensis on the immune responses of the Colorado potato beetle.

Invasion of microorganisms into the gut of insects triggers a cascade of immune reactions accompanied by increased synthesis of effectors (such as antimicrobial peptides, cytokines, and amino acids), leading to changes in the physiological state of the host. We hypothesized that even an inactivated bacterium can induce an immune response in an insect. The aim of this study was to compare the roles of reactive oxygen species (ROS) formation and of the response of detoxification and antioxidant systems in a Colorado potato beetle (CPB) larval model in the first hours after invasion by either an inactivated or live bacterium. The influence of per os inoculation with inactivated entomopathogenic bacterium Bacillus thuringiensis var. tenebrionis (Bt) on the survival and physiological and biochemical parameters of CPB larvae was assessed as changes in the total hemocyte count (THC), activity of phenoloxidases (POs), glutathione-S-transferases (GSTs), nonspecific esterases (ESTs), catalase, peroxidases, superoxide dismutases (SODs) and formation of reactive oxygen species (ROS). A series of changes occurred within the hemolymph and the midgut of CPBs inoculated with inactivated Bt at 12 h after inoculation. These physiological and biochemical alterations serve to mediate generalized resistance to pathogens. The changes were associated with an increase in the THC and a 1.4-2.2-fold enhancement of detoxification enzymatic activities (such as GST and EST) as well as increased levels of antioxidants (especially peroxidases) in hemolymph in comparison to the control group. Suppressed EST activity and reduced ROS formation were simultaneously detectable in the larval midgut. Inoculation of beetle larvae with active Bt cells yielded similar results (elevated THC and suppressed PO activity). A fundamental difference in the immune activation processes between larvae that ingested the inactivated bacterium and larvae that had consumed the active bacterium was that the inactivated bacterium did not influence ROS formation in the hemolymph but did reduce their formation in the midgut. At 24 h postinfection with active Bt, ROS levels went up in both the hemolymph and the midgut. This was accompanied by a significant 5.7-fold enhancement of SOD activity and a 5.3-fold suppression of peroxidase activity. The observed alterations may be due to within-gut toxicity caused by early-stage bacteriosis. The imbalance in the antioxidant system and the accumulation of products toxic to the "putative" pathogen can activate detoxification mechanisms, including those of an enzymatic nature (EST and GST). The activation of detoxification processes and of innate immune responses is probably due to the recognition of the "putative" pathogen by gut epithelial cells and is similar in many respects to the immune response at early stages of bacteriosis.